HONEYCOMB-9: Split impl module into smaller parts

Change-Id: I9232e0adfe611cb97951080839b28a7b62ba5484
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>

9 files changed, 1238 insertions, 0 deletions

diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/BridgeDomainCustomizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/BridgeDomainCustomizer.java
new file mode 100644
index 000000000..2c394fe77
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/BridgeDomainCustomizer.java
@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.facade.v3po.vpp;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkState;
+
+import io.fd.honeycomb.v3po.vpp.facade.impl.util.VppApiCustomizer;
+import io.fd.honeycomb.v3po.vpp.facade.Context;
+import io.fd.honeycomb.v3po.vpp.facade.spi.write.ListVppWriterCustomizer;
+import java.util.List;
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.BridgeDomains;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomain;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomainKey;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class BridgeDomainCustomizer
+    extends VppApiCustomizer
+    implements ListVppWriterCustomizer<BridgeDomain, BridgeDomainKey> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(BridgeDomainCustomizer.class);
+
+    private static final byte ADD_OR_UPDATE_BD = (byte) 1;
+    private static final int RESPONSE_NOT_READY = -77;
+    private static final int RELEASE = 1;
+
+    public BridgeDomainCustomizer(final org.openvpp.vppjapi.vppApi api) {
+        super(api);
+    }
+
+    @Nonnull
+    @Override
+    public List<BridgeDomain> extract(@Nonnull final InstanceIdentifier<BridgeDomain> currentId,
+                                      @Nonnull final DataObject parentData) {
+        return ((BridgeDomains) parentData).getBridgeDomain();
+    }
+
+    private int waitForResponse(final int ctxId) {
+        int rv;
+        while ((rv = getVppApi().getRetval(ctxId, RELEASE)) == RESPONSE_NOT_READY) {
+            // TODO limit attempts
+        }
+        return rv;
+    }
+
+    private int addOrUpdateBridgeDomain(final int bdId, @Nonnull final BridgeDomain bd) {
+        byte flood = booleanToByte(bd.isFlood());
+        byte forward = booleanToByte(bd.isForward());
+        byte learn = booleanToByte(bd.isLearn());
+        byte uuf = booleanToByte(bd.isUnknownUnicastFlood());
+        byte arpTerm = booleanToByte(bd.isArpTermination());
+
+        int ctxId = getVppApi().bridgeDomainAddDel(bdId, flood, forward, learn, uuf, arpTerm, ADD_OR_UPDATE_BD);
+        return waitForResponse(ctxId);
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<BridgeDomain> id,
+                                       @Nonnull final BridgeDomain current,
+                                       @Nonnull final Context ctx) {
+        LOG.debug("writeCurrentAttributes: id={}, current={}, ctx={}", id, current, ctx);
+        final String bdName = current.getName();
+        int bdId = getVppApi().findOrAddBridgeDomainId(bdName);
+        checkState(bdId > 0, "Unable to find or create bridge domain. Return code: %s", bdId);
+
+        int rv = addOrUpdateBridgeDomain(bdId, current);
+
+        checkState(rv >= 0, "Bridge domain %s(%s) write failed. Return code: %s", bdName, bdId, rv);
+        LOG.debug("Bridge domain {} written as {} successfully", bdName, bdId);
+    }
+
+    private byte booleanToByte(@Nullable final Boolean aBoolean) {
+        return aBoolean != null && aBoolean ? (byte) 1 : (byte) 0;
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<BridgeDomain> id,
+                                        @Nonnull final BridgeDomain dataBefore,
+                                        @Nonnull final Context ctx) {
+        LOG.debug("deleteCurrentAttributes: id={}, dataBefore={}, ctx={}", id, dataBefore, ctx);
+        String bdName = id.firstKeyOf(BridgeDomain.class).getName();
+
+        int bdId = getVppApi().bridgeDomainIdFromName(bdName);
+        checkState(bdId > 0, "Unable to delete bridge domain. Does not exist. Return code: %s", bdId);
+
+        int ctxId = getVppApi().bridgeDomainAddDel(bdId,
+            (byte) 0 /* flood */,
+            (byte) 0 /* forward */,
+            (byte) 0 /* learn */,
+            (byte) 0 /* uuf */,
+            (byte) 0 /* arpTerm */,
+            (byte) 0 /* isAdd */);
+
+        int rv = waitForResponse(ctxId);
+
+        checkState(rv >= 0, "Bridge domain delete failed. Return code: %s", rv);
+        LOG.debug("Bridge domain {} deleted as {} successfully", bdName, bdId);
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<BridgeDomain> id,
+                                        @Nonnull final BridgeDomain dataBefore, @Nonnull final BridgeDomain dataAfter,
+                                        @Nonnull final Context ctx) {
+        LOG.debug("updateCurrentAttributes: id={}, dataBefore={}, dataAfter={}, ctx={}", id, dataBefore, dataAfter, ctx);
+
+        final String bdName = checkNotNull(dataAfter.getName());
+        checkArgument(bdName.equals(dataBefore.getName()), "BridgeDomain name changed. It should be deleted and then created.");
+
+        int bdId = getVppApi().bridgeDomainIdFromName(bdName);
+        checkState(bdId > 0, "Unable to find bridge domain. Return code: %s", bdId);
+
+        final int rv = addOrUpdateBridgeDomain(bdId, dataAfter);
+
+        checkState(rv >= 0, "Bridge domain %s(%s) update failed. Return code: %s", bdName, bdId, rv);
+        LOG.debug("Bridge domain {}({}) updated successfully", bdName, bdId);
+    }
+
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/BridgeDomainCustomizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/BridgeDomainCustomizer.java
new file mode 100644
index 000000000..178deaddf
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/BridgeDomainCustomizer.java
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.facade.v3po.vppstate;
+
+import com.google.common.collect.Lists;
+import io.fd.honeycomb.v3po.vpp.facade.impl.util.VppApiCustomizer;
+import io.fd.honeycomb.v3po.vpp.facade.Context;
+import io.fd.honeycomb.v3po.vpp.facade.spi.read.ListVppReaderCustomizer;
+import java.util.ArrayList;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.PhysAddress;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.BridgeDomainsBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomain;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomainBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomainKey;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.bridge.domain.Interface;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.bridge.domain.InterfaceBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.bridge.domain.InterfaceKey;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.bridge.domain.L2Fib;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.bridge.domain.L2FibBuilder;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.openvpp.vppjapi.vppBridgeDomainDetails;
+import org.openvpp.vppjapi.vppBridgeDomainInterfaceDetails;
+import org.openvpp.vppjapi.vppL2Fib;
+
+public final class BridgeDomainCustomizer extends VppApiCustomizer
+    implements ListVppReaderCustomizer<BridgeDomain, BridgeDomainKey, BridgeDomainBuilder> {
+
+    public BridgeDomainCustomizer(@Nonnull final org.openvpp.vppjapi.vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Override
+    public void readCurrentAttributes(@Nonnull final InstanceIdentifier<BridgeDomain> id,
+                                      @Nonnull final BridgeDomainBuilder builder, @Nonnull final Context context) {
+        final BridgeDomainKey key = id.firstKeyOf(id.getTargetType());
+        // TODO find out if bd exists based on name and if not return
+
+        final int bdId = getVppApi().bridgeDomainIdFromName(key.getName());
+        final vppBridgeDomainDetails bridgeDomainDetails = getVppApi().getBridgeDomainDetails(bdId);
+
+        builder.setName(key.getName());
+        // builder.setName(bridgeDomainDetails.name);
+        builder.setArpTermination(bridgeDomainDetails.arpTerm);
+        builder.setFlood(bridgeDomainDetails.flood);
+        builder.setForward(bridgeDomainDetails.forward);
+        builder.setLearn(bridgeDomainDetails.learn);
+        builder.setUnknownUnicastFlood(bridgeDomainDetails.uuFlood);
+
+        builder.setInterface(getIfcs(bridgeDomainDetails));
+
+        final vppL2Fib[] vppL2Fibs = getVppApi().l2FibTableDump(bdId);
+
+        final List<L2Fib> l2Fibs = Lists.newArrayListWithCapacity(vppL2Fibs.length);
+        for (vppL2Fib vppL2Fib : vppL2Fibs) {
+            l2Fibs.add(new L2FibBuilder()
+                .setAction((vppL2Fib.filter
+                    ? L2Fib.Action.Filter
+                    : L2Fib.Action.Forward))
+                .setBridgedVirtualInterface(vppL2Fib.bridgedVirtualInterface)
+                .setOutgoingInterface(vppL2Fib.outgoingInterface)
+                .setPhysAddress(new PhysAddress(getMacAddress(vppL2Fib.physAddress)))
+                .setStaticConfig(vppL2Fib.staticConfig)
+                .build());
+        }
+        builder.setL2Fib(l2Fibs);
+    }
+
+    private static String getMacAddress(byte[] mac) {
+        StringBuilder sb = new StringBuilder(18);
+        for (byte b : mac) {
+            if (sb.length() > 0) {
+                sb.append(':');
+            }
+            sb.append(String.format("%02x", b));
+        }
+        return sb.toString();
+    }
+
+    private List<Interface> getIfcs(final vppBridgeDomainDetails bridgeDomainDetails) {
+        final List<Interface> ifcs = new ArrayList<>(bridgeDomainDetails.interfaces.length);
+        for (vppBridgeDomainInterfaceDetails anInterface : bridgeDomainDetails.interfaces) {
+            ifcs.add(new InterfaceBuilder()
+                .setBridgedVirtualInterface(bridgeDomainDetails.bviInterfaceName.equals(anInterface.interfaceName))
+                .setName(anInterface.interfaceName)
+                .setKey(new InterfaceKey(anInterface.interfaceName))
+                .build());
+        }
+        return ifcs;
+    }
+
+    @Nonnull
+    @Override
+    public BridgeDomainBuilder getBuilder(@Nonnull final InstanceIdentifier<BridgeDomain> id) {
+        return new BridgeDomainBuilder();
+    }
+
+    @Nonnull
+    @Override
+    public List<BridgeDomainKey> getAllIds(@Nonnull final InstanceIdentifier<BridgeDomain> id, @Nonnull final Context context) {
+        final int[] bIds = getVppApi().bridgeDomainDump(-1);
+        final List<BridgeDomainKey> allIds = new ArrayList<>(bIds.length);
+        for (int bId : bIds) {
+            // FIXME this is highly inefficient having to dump all of the bridge domain details
+            // Use context to store already read information
+            // TODO Or just remove the getAllIds method and replace with a simple readAll
+            final vppBridgeDomainDetails bridgeDomainDetails = getVppApi().getBridgeDomainDetails(bId);
+            final String bName = bridgeDomainDetails.name;
+            allIds.add(new BridgeDomainKey(bName));
+        }
+
+        return allIds;
+    }
+
+    @Override
+    public void merge(@Nonnull final Builder<? extends DataObject> builder, @Nonnull final List<BridgeDomain> readData) {
+        ((BridgeDomainsBuilder) builder).setBridgeDomain(readData);
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/VersionCustomizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/VersionCustomizer.java
new file mode 100644
index 000000000..3e928176e
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/VersionCustomizer.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.facade.v3po.vppstate;
+
+import io.fd.honeycomb.v3po.vpp.facade.Context;
+import io.fd.honeycomb.v3po.vpp.facade.impl.util.VppApiCustomizer;
+import io.fd.honeycomb.v3po.vpp.facade.spi.read.ChildVppReaderCustomizer;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppStateBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.Version;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.VersionBuilder;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.openvpp.vppjapi.vppVersion;
+
+public final class VersionCustomizer
+    extends VppApiCustomizer
+    implements ChildVppReaderCustomizer<Version, VersionBuilder> {
+
+    public VersionCustomizer(@Nonnull final org.openvpp.vppjapi.vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Override
+    public void merge(@Nonnull final Builder<? extends DataObject> parentBuilder, @Nonnull final Version readValue) {
+        ((VppStateBuilder) parentBuilder).setVersion(readValue);
+    }
+
+    @Nonnull
+    @Override
+    public VersionBuilder getBuilder(@Nonnull InstanceIdentifier<Version> id) {
+        return new VersionBuilder();
+    }
+
+    @Override
+    public void readCurrentAttributes(@Nonnull InstanceIdentifier<Version> id, @Nonnull final VersionBuilder builder,
+                                      @Nonnull final Context context) {
+        final vppVersion vppVersion = getVppApi().getVppVersion();
+        builder.setBranch(vppVersion.gitBranch);
+        builder.setName(vppVersion.programName);
+        builder.setBuildDate(vppVersion.buildDate);
+        builder.setBuildDirectory(vppVersion.buildDirectory);
+    }
+}
diff --git a/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/BridgeDomainCustomizerTest.java b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/BridgeDomainCustomizerTest.java
new file mode 100644
index 000000000..059713544
--- /dev/null
+++ b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/BridgeDomainCustomizerTest.java
@@ -0,0 +1,269 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.facade.v3po.vpp;
+
+import static io.fd.honeycomb.v3po.vpp.facade.v3po.vpp.BridgeDomainTestUtils.BD_NAME_TO_ID_ANSWER;
+import static io.fd.honeycomb.v3po.vpp.facade.v3po.vpp.BridgeDomainTestUtils.bdIdentifierForName;
+import static io.fd.honeycomb.v3po.vpp.facade.v3po.vpp.BridgeDomainTestUtils.bdNameToID;
+import static io.fd.honeycomb.v3po.vpp.facade.v3po.vpp.BridgeDomainTestUtils.booleanToByte;
+import static io.fd.honeycomb.v3po.vpp.facade.v3po.vpp.BridgeDomainTestUtils.intToBoolean;
+import static org.junit.Assert.fail;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.MockitoAnnotations.initMocks;
+
+import io.fd.honeycomb.v3po.vpp.facade.Context;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomain;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomainBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomainKey;
+import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
+import org.openvpp.vppjapi.vppApi;
+import org.powermock.api.mockito.PowerMockito;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.powermock.core.classloader.annotations.SuppressStaticInitializationFor;
+import org.powermock.modules.junit4.PowerMockRunner;
+
+@RunWith(PowerMockRunner.class)
+@SuppressStaticInitializationFor("org.openvpp.vppjapi.vppConn")
+@PrepareForTest(vppApi.class)
+public class BridgeDomainCustomizerTest {
+
+    private static final int RESPONSE_NOT_READY = -77;
+    private static final byte ADD_OR_UPDATE_BD = (byte) 1;
+    private static final byte ZERO = 0;
+    private vppApi api;
+
+    @Mock
+    private Context ctx;
+
+    private BridgeDomainCustomizer customizer;
+
+    @Before
+    public void setUp() throws Exception {
+        // TODO create base class for tests using vppApi
+        api = PowerMockito.mock(vppApi.class);
+        initMocks(this);
+        customizer = new BridgeDomainCustomizer(api);
+
+        PowerMockito.doAnswer(BD_NAME_TO_ID_ANSWER).when(api).findOrAddBridgeDomainId(anyString());
+        PowerMockito.doAnswer(BD_NAME_TO_ID_ANSWER).when(api).bridgeDomainIdFromName(anyString());
+        PowerMockito.when(api.getRetval(anyInt(), anyInt())).thenReturn(RESPONSE_NOT_READY).thenReturn(0);
+        PowerMockito.doReturn(0).when(api).getRetval(anyInt(), anyInt());
+    }
+
+    private BridgeDomain generateBridgeDomain(final String bdName) {
+        final byte arpTerm = 0;
+        final byte flood = 1;
+        final byte forward = 0;
+        final byte learn = 1;
+        final byte uuf = 0;
+        return generateBridgeDomain(bdName, arpTerm, flood, forward, learn, uuf);
+    }
+
+    private BridgeDomain generateBridgeDomain(final String bdName, final int arpTerm, final int flood,
+                                              final int forward, final int learn, final int uuf) {
+        return new BridgeDomainBuilder()
+                .setName(bdName)
+                .setArpTermination(intToBoolean(arpTerm))
+                .setFlood(intToBoolean(flood))
+                .setForward(intToBoolean(forward))
+                .setLearn(intToBoolean(learn))
+                .setUnknownUnicastFlood(intToBoolean(uuf))
+                .build();
+    }
+
+    private final int verifyBridgeDomainAddOrUpdateWasInvoked(final BridgeDomain bd) {
+        final int bdn1Id = bdNameToID(bd.getName());
+        final byte arpTerm = booleanToByte(bd.isArpTermination());
+        final byte flood = booleanToByte(bd.isFlood());
+        final byte forward = booleanToByte(bd.isForward());
+        final byte learn = booleanToByte(bd.isLearn());
+        final byte uuf = booleanToByte(bd.isUnknownUnicastFlood());
+        return verify(api).bridgeDomainAddDel(bdn1Id, flood, forward, learn, uuf, arpTerm, ADD_OR_UPDATE_BD);
+    }
+
+    private int verifyBridgeDomainAddOrUpdateWasNotInvoked(final BridgeDomain bd) {
+        final int bdn1Id = bdNameToID(bd.getName());
+        final byte arpTerm = booleanToByte(bd.isArpTermination());
+        final byte flood = booleanToByte(bd.isFlood());
+        final byte forward = booleanToByte(bd.isForward());
+        final byte learn = booleanToByte(bd.isLearn());
+        final byte uuf = booleanToByte(bd.isUnknownUnicastFlood());
+        return verify(api, never()).bridgeDomainAddDel(bdn1Id, flood, forward, learn, uuf, arpTerm, ADD_OR_UPDATE_BD);
+    }
+
+    private int verifyBridgeDomainDeletedWasInvoked(final BridgeDomain bd) {
+        final int bdn1Id = bdNameToID(bd.getName());
+        return verify(api).bridgeDomainAddDel(bdn1Id, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO);
+    }
+
+    private int verifyBridgeDomainDeletedWasNotInvoked(final BridgeDomain bd) {
+        final int bdn1Id = bdNameToID(bd.getName());
+        return verify(api, never()).bridgeDomainAddDel(bdn1Id, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO);
+    }
+
+    @Test
+    public void testAddBridgeDomain() {
+        final String bdName = "bd1";
+        final BridgeDomain bd = generateBridgeDomain("bd1");
+
+        customizer.writeCurrentAttributes(bdIdentifierForName(bdName), bd, ctx);
+
+        verifyBridgeDomainAddOrUpdateWasInvoked(bd);
+    }
+
+    @Test
+    public void testBridgeDomainNameCreateFailed() {
+        final String bdName = "bd1";
+        final BridgeDomain bd = generateBridgeDomain("bd1");
+
+        // make vpp api fail to create id for our bd name
+        PowerMockito.doReturn(-1).when(api).findOrAddBridgeDomainId(bdName);
+
+        try {
+            customizer.writeCurrentAttributes(bdIdentifierForName(bdName), bd, ctx);
+        } catch (IllegalStateException e) {
+            verifyBridgeDomainAddOrUpdateWasNotInvoked(bd);
+            return;
+        }
+        fail("IllegalStateException was expected");
+    }
+
+    @Test
+    public void testAddBridgeDomainFailed() {
+        // make any call to vpp fail
+        PowerMockito.doReturn(-1).when(api).getRetval(anyInt(), anyInt());
+
+        final String bdName = "bd1";
+        final BridgeDomain bd = generateBridgeDomain(bdName);
+
+        try {
+            customizer.writeCurrentAttributes(bdIdentifierForName(bdName), bd, ctx);
+        } catch (IllegalStateException e) {
+            verifyBridgeDomainAddOrUpdateWasInvoked(bd);
+            return;
+        }
+        fail("IllegalStateException was expected");
+    }
+
+    @Test
+    public void testDeleteBridgeDomain() {
+        final String bdName = "bd1";
+        final BridgeDomain bd = generateBridgeDomain("bd1");
+
+        customizer.deleteCurrentAttributes(bdIdentifierForName(bdName), bd, ctx);
+
+        verifyBridgeDomainDeletedWasInvoked(bd);
+    }
+
+    @Test
+    public void testDeleteUnknownBridgeDomain() {
+        final String bdName = "bd1";
+        final BridgeDomain bd = generateBridgeDomain("bd1");
+
+        // make vpp api not find our bd
+        PowerMockito.doReturn(-1).when(api).bridgeDomainIdFromName(bdName);
+
+        try {
+            customizer.deleteCurrentAttributes(bdIdentifierForName(bdName), bd, ctx);
+        } catch (IllegalStateException e) {
+            verifyBridgeDomainDeletedWasNotInvoked(bd);
+            return;
+        }
+        fail("IllegalStateException was expected");
+    }
+
+    @Test
+    public void testDeleteBridgeDomainFailed() {
+        // make any call to vpp fail
+        PowerMockito.doReturn(-1).when(api).getRetval(anyInt(), anyInt());
+
+        final String bdName = "bd1";
+        final BridgeDomain bd = generateBridgeDomain(bdName);
+
+        try {
+            customizer.deleteCurrentAttributes(bdIdentifierForName(bdName), bd, ctx);
+        } catch (IllegalStateException e) {
+            verifyBridgeDomainDeletedWasInvoked(bd);
+            return;
+        }
+        fail("IllegalStateException was expected");
+    }
+
+    @Test
+    public void testUpdateBridgeDomain() throws Exception {
+        final String bdName = "bd1";
+        final byte arpTermBefore = 1;
+        final byte floodBefore = 1;
+        final byte forwardBefore = 0;
+        final byte learnBefore = 1;
+        final byte uufBefore = 0;
+
+        final BridgeDomain dataBefore =
+                generateBridgeDomain(bdName, arpTermBefore, floodBefore, forwardBefore, learnBefore, uufBefore);
+        final BridgeDomain dataAfter =
+                generateBridgeDomain(bdName, arpTermBefore ^ 1, floodBefore ^ 1, forwardBefore ^ 1, learnBefore ^ 1,
+                        uufBefore ^ 1);
+
+        final KeyedInstanceIdentifier<BridgeDomain, BridgeDomainKey> id = bdIdentifierForName(bdName);
+
+        customizer.updateCurrentAttributes(id, dataBefore, dataAfter, ctx);
+
+        verifyBridgeDomainAddOrUpdateWasInvoked(dataAfter);
+    }
+
+    @Test
+    public void testUpdateUnknownBridgeDomain() throws Exception {
+        final String bdName = "bd1";
+        final BridgeDomain bd = generateBridgeDomain("bd1");
+
+        // make vpp api not find our bd
+        PowerMockito.doReturn(-1).when(api).bridgeDomainIdFromName(bdName);
+
+        try {
+            customizer.updateCurrentAttributes(bdIdentifierForName(bdName), bd, bd, ctx);
+        } catch (IllegalStateException e) {
+            verifyBridgeDomainAddOrUpdateWasNotInvoked(bd);
+            return;
+        }
+        fail("IllegalStateException was expected");
+    }
+
+    @Test
+    public void testUpdateBridgeDomainFailed() {
+        // make any call to vpp fail
+        PowerMockito.doReturn(-1).when(api).getRetval(anyInt(), anyInt());
+
+        final String bdName = "bd1";
+        final BridgeDomain bd = generateBridgeDomain(bdName);
+
+        try {
+            customizer.updateCurrentAttributes(bdIdentifierForName(bdName), bd, bd, ctx);
+        } catch (IllegalStateException e) {
+            verifyBridgeDomainAddOrUpdateWasInvoked(bd);
+            return;
+        }
+        fail("IllegalStateException was expected");
+    }
+
+}
\ No newline at end of file
diff --git a/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/BridgeDomainTestUtils.java b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/BridgeDomainTestUtils.java
new file mode 100644
index 000000000..51a6b023e
--- /dev/null
+++ b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/BridgeDomainTestUtils.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.facade.v3po.vpp;
+
+import javax.annotation.Nullable;
+import org.mockito.invocation.InvocationOnMock;
+import org.mockito.stubbing.Answer;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.BridgeDomains;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomain;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomainKey;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
+
+final class BridgeDomainTestUtils {
+
+    private BridgeDomainTestUtils() {
+        throw new UnsupportedOperationException("Utility class cannot be instantiated.");
+    }
+
+    public static byte booleanToByte(@Nullable final Boolean value) {
+        return value != null && value ? (byte) 1 : (byte) 0;
+    }
+
+    @Nullable
+    public static Boolean intToBoolean(final int value) {
+        if (value == 0)  {
+            return Boolean.FALSE;
+        }
+        if (value == 1) {
+            return Boolean.TRUE;
+        }
+        return null;
+    }
+
+    public static int bdNameToID(String bName) {
+        return Integer.parseInt(((Character)bName.charAt(bName.length() - 1)).toString());
+    }
+
+    public static KeyedInstanceIdentifier<BridgeDomain, BridgeDomainKey> bdIdentifierForName(
+            final String bdName) {
+        return InstanceIdentifier.create(BridgeDomains.class).child(BridgeDomain.class, new BridgeDomainKey(bdName));
+    }
+
+    public static final Answer<Integer> BD_NAME_TO_ID_ANSWER = new Answer<Integer>() {
+        @Override
+        public Integer answer(final InvocationOnMock invocationOnMock) throws Throwable {
+            return bdNameToID((String) invocationOnMock.getArguments()[0]);
+        }
+    };
+}
\ No newline at end of file
diff --git a/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/VppTest.java b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/VppTest.java
new file mode 100644
index 000000000..bc5bda383
--- /dev/null
+++ b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/VppTest.java
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.facade.v3po.vpp;
+
+import static io.fd.honeycomb.v3po.vpp.facade.v3po.vpp.BridgeDomainTestUtils.BD_NAME_TO_ID_ANSWER;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyZeroInteractions;
+
+import com.google.common.collect.Lists;
+import io.fd.honeycomb.v3po.vpp.facade.impl.write.CompositeRootVppWriter;
+import io.fd.honeycomb.v3po.vpp.facade.impl.write.util.DelegatingWriterRegistry;
+import io.fd.honeycomb.v3po.vpp.facade.write.VppWriter;
+import io.fd.honeycomb.v3po.vpp.facade.write.WriteContext;
+import java.util.Collections;
+import java.util.List;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.Vpp;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.BridgeDomains;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.BridgeDomainsBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomain;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomainBuilder;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.openvpp.vppjapi.vppApi;
+import org.powermock.api.mockito.PowerMockito;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.powermock.core.classloader.annotations.SuppressStaticInitializationFor;
+import org.powermock.modules.junit4.PowerMockRunner;
+
+@RunWith(PowerMockRunner.class)
+@SuppressStaticInitializationFor("org.openvpp.vppjapi.vppConn")
+@PrepareForTest(vppApi.class)
+public class VppTest {
+
+    private vppApi api;
+    private DelegatingWriterRegistry rootRegistry;
+    private CompositeRootVppWriter<Vpp> vppWriter;
+    private WriteContext ctx;
+
+    final byte zero = (byte) 0;
+    final byte flood = (byte) 1;
+    final byte forward = (byte) 0;
+    final byte learn = (byte) 1;
+    final byte uuf = (byte) 0;
+    final byte arpTerm = (byte) 0;
+    final byte add = (byte) 1;
+
+    @Before
+    public void setUp() throws Exception {
+        api = PowerMockito.mock(vppApi.class);
+        ctx = mock(WriteContext.class);
+        PowerMockito.doAnswer(BD_NAME_TO_ID_ANSWER).when(api).findOrAddBridgeDomainId(anyString());
+        PowerMockito.doAnswer(BD_NAME_TO_ID_ANSWER).when(api).bridgeDomainIdFromName(anyString());
+        PowerMockito.doReturn(1).when(api).getRetval(anyInt(), anyInt());
+        vppWriter = VppUtils.getVppWriter(api);
+        rootRegistry = new DelegatingWriterRegistry(
+            Collections.<VppWriter<? extends DataObject>>singletonList(vppWriter));
+    }
+
+    @Test
+    public void writeVpp() throws Exception {
+        rootRegistry.update(
+            InstanceIdentifier.create(Vpp.class),
+            null,
+            new VppBuilder().setBridgeDomains(getBridgeDomains("bdn1")).build(),
+            ctx);
+
+        verify(api).bridgeDomainAddDel(1, flood, forward, learn, uuf, arpTerm, add);
+
+        vppWriter.update(InstanceIdentifier.create(Vpp.class),
+            null,
+            new VppBuilder().setBridgeDomains(getBridgeDomains("bdn1")).build(),
+            ctx);
+
+        verify(api, times(2)).bridgeDomainAddDel(1, flood, forward, learn, uuf, arpTerm, add);
+    }
+
+    @Test
+    public void writeVppFromRoot() throws Exception {
+        final Vpp vpp = new VppBuilder().setBridgeDomains(getBridgeDomains("bdn1")).build();
+
+        rootRegistry.update(Collections.<InstanceIdentifier<?>, DataObject>emptyMap(),
+            Collections.<InstanceIdentifier<?>, DataObject>singletonMap(InstanceIdentifier.create(Vpp.class),
+                vpp), ctx);
+
+        verify(api).bridgeDomainAddDel(1, flood, forward, learn, uuf, arpTerm, add);
+    }
+
+    private BridgeDomains getBridgeDomains(String... name) {
+        final List<BridgeDomain> bdmns = Lists.newArrayList();
+        for (String s : name) {
+            bdmns.add(new BridgeDomainBuilder()
+                .setName(s)
+                .setArpTermination(false)
+                .setFlood(true)
+                .setForward(false)
+                .setLearn(true)
+                .build());
+        }
+        return new BridgeDomainsBuilder()
+                .setBridgeDomain(bdmns)
+                .build();
+    }
+
+    @Test
+    public void deleteVpp() throws Exception {
+        rootRegistry.update(
+            InstanceIdentifier.create(Vpp.class),
+            new VppBuilder().setBridgeDomains(getBridgeDomains("bdn1")).build(),
+            null,
+            ctx);
+
+        final byte zero = (byte) 0;
+
+        verify(api).bridgeDomainAddDel(1, zero, zero, zero, zero, zero, zero);
+    }
+
+    @Test
+    public void updateVppNoActualChange() throws Exception {
+        rootRegistry.update(
+            InstanceIdentifier.create(Vpp.class),
+            new VppBuilder().setBridgeDomains(getBridgeDomains("bdn1")).build(),
+            new VppBuilder().setBridgeDomains(getBridgeDomains("bdn1")).build(),
+            ctx);
+
+        verifyZeroInteractions(api);
+    }
+
+    @Test
+    public void writeUpdate() throws Exception {
+        final BridgeDomains domainsBefore = getBridgeDomains("bdn1");
+        final BridgeDomain bdn1Before = domainsBefore.getBridgeDomain().get(0);
+
+        final BridgeDomain bdn1After = new BridgeDomainBuilder(bdn1Before).setFlood(!bdn1Before.isFlood()).build();
+        final BridgeDomains domainsAfter = new BridgeDomainsBuilder()
+            .setBridgeDomain(Collections.singletonList(bdn1After))
+            .build();
+
+        rootRegistry.update(
+            InstanceIdentifier.create(Vpp.class),
+            new VppBuilder().setBridgeDomains(domainsBefore).build(),
+            new VppBuilder().setBridgeDomains(domainsAfter).build(),
+            ctx);
+
+        final int bdn1Id = 1;
+
+        // bdn1 is created with negated flood value
+        verify(api).bridgeDomainAddDel(bdn1Id, (byte) (flood ^ 1), forward, learn, uuf, arpTerm, add);
+    }
+
+    // TODO test unkeyed list
+    // TODO test update of a child without dedicated writer
+}
\ No newline at end of file
diff --git a/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/VppUtils.java b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/VppUtils.java
new file mode 100644
index 000000000..ccf19c81c
--- /dev/null
+++ b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vpp/VppUtils.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.facade.v3po.vpp;
+
+import io.fd.honeycomb.v3po.vpp.facade.impl.util.VppRWUtils;
+import io.fd.honeycomb.v3po.vpp.facade.impl.write.CompositeChildVppWriter;
+import io.fd.honeycomb.v3po.vpp.facade.impl.write.CompositeListVppWriter;
+import io.fd.honeycomb.v3po.vpp.facade.impl.write.CompositeRootVppWriter;
+import io.fd.honeycomb.v3po.vpp.facade.impl.write.util.NoopWriterCustomizer;
+import io.fd.honeycomb.v3po.vpp.facade.impl.write.util.ReflexiveChildWriterCustomizer;
+import io.fd.honeycomb.v3po.vpp.facade.write.ChildVppWriter;
+import java.util.ArrayList;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.Vpp;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.BridgeDomains;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomain;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomainKey;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+import org.openvpp.vppjapi.vppApi;
+
+final class VppUtils {
+
+    public VppUtils() {}
+
+    /**
+     * Create root Vpp writer with all its children wired
+     */
+    static CompositeRootVppWriter<Vpp> getVppWriter(@Nonnull final vppApi vppApi) {
+
+        final CompositeListVppWriter<BridgeDomain, BridgeDomainKey> bridgeDomainWriter = new CompositeListVppWriter<>(
+            BridgeDomain.class,
+            new BridgeDomainCustomizer(vppApi));
+
+        final ChildVppWriter<BridgeDomains> bridgeDomainsReader = new CompositeChildVppWriter<>(
+            BridgeDomains.class,
+            VppRWUtils.singletonChildWriterList(bridgeDomainWriter),
+            new ReflexiveChildWriterCustomizer<BridgeDomains>());
+
+        final List<ChildVppWriter<? extends ChildOf<Vpp>>> childWriters = new ArrayList<>();
+        childWriters.add(bridgeDomainsReader);
+
+        return new CompositeRootVppWriter<>(
+            Vpp.class,
+            childWriters,
+            new NoopWriterCustomizer<Vpp>());
+    }
+}
diff --git a/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/VppStateTest.java b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/VppStateTest.java
new file mode 100644
index 000000000..059c98f56
--- /dev/null
+++ b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/VppStateTest.java
@@ -0,0 +1,259 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.facade.v3po.vppstate;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.mock;
+
+import com.google.common.base.Optional;
+import com.google.common.base.Predicate;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Multimap;
+import io.fd.honeycomb.v3po.vpp.facade.impl.read.CompositeListVppReader;
+import io.fd.honeycomb.v3po.vpp.facade.impl.read.CompositeRootVppReader;
+import io.fd.honeycomb.v3po.vpp.facade.impl.read.util.DelegatingReaderRegistry;
+import io.fd.honeycomb.v3po.vpp.facade.read.ReadContext;
+import io.fd.honeycomb.v3po.vpp.facade.read.VppReader;
+import java.util.Collections;
+import java.util.List;
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Matchers;
+import org.mockito.invocation.InvocationOnMock;
+import org.mockito.stubbing.Answer;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.PhysAddress;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppState;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppStateBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.BridgeDomains;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.Version;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.VersionBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomain;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomainBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomainKey;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.bridge.domain.L2Fib;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.bridge.domain.L2FibKey;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.openvpp.vppjapi.vppApi;
+import org.openvpp.vppjapi.vppBridgeDomainDetails;
+import org.openvpp.vppjapi.vppBridgeDomainInterfaceDetails;
+import org.openvpp.vppjapi.vppL2Fib;
+import org.openvpp.vppjapi.vppVersion;
+import org.powermock.api.mockito.PowerMockito;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.powermock.core.classloader.annotations.SuppressStaticInitializationFor;
+import org.powermock.modules.junit4.PowerMockRunner;
+
+@RunWith(PowerMockRunner.class)
+@SuppressStaticInitializationFor("org.openvpp.vppjapi.vppConn")
+@PrepareForTest(vppApi.class)
+public class VppStateTest {
+
+    public static final vppVersion VERSION = new vppVersion("test", "1", "2", "33");
+
+    private vppApi api;
+    private CompositeRootVppReader<VppState, VppStateBuilder> vppStateReader;
+    private DelegatingReaderRegistry readerRegistry;
+    private vppBridgeDomainDetails bdDetails;
+    private vppBridgeDomainDetails bdDetails2;
+    private ReadContext ctx;
+
+    @Before
+    public void setUp() throws Exception {
+        api = PowerMockito.mock(vppApi.class);
+
+        ctx = mock(ReadContext.class);
+
+        bdDetails = new vppBridgeDomainDetails();
+        setIfcs(bdDetails);
+        setBaseAttrs(bdDetails, "bdn1", 1);
+
+        bdDetails2 = new vppBridgeDomainDetails();
+        setIfcs(bdDetails2);
+        setBaseAttrs(bdDetails2, "bdn2", 2);
+
+        final vppL2Fib[] l2Fibs = getL2Fibs();
+        PowerMockito.doReturn(l2Fibs).when(api).l2FibTableDump(Matchers.anyInt());
+        PowerMockito.doAnswer(new Answer<vppBridgeDomainDetails>() {
+
+            @Override
+            public vppBridgeDomainDetails answer(final InvocationOnMock invocationOnMock) throws Throwable {
+                final Integer idx = (Integer) invocationOnMock.getArguments()[0];
+                switch (idx) {
+                    case 1 : return bdDetails;
+                    case 2 : return bdDetails2;
+                    default: return null;
+                }
+            }
+        }).when(api).getBridgeDomainDetails(Matchers.anyInt());
+
+        PowerMockito.doAnswer(new Answer<Object>() {
+            @Override
+            public Object answer(final InvocationOnMock invocationOnMock) throws Throwable {
+                final String name = (String) invocationOnMock.getArguments()[0];
+                switch (name) {
+                    case "bdn1" : return 1;
+                    case "bdn2" : return 2;
+                    default: return null;
+                }
+            }
+        }).when(api).bridgeDomainIdFromName(anyString());
+        PowerMockito.doReturn(new int[] {1, 2}).when(api).bridgeDomainDump(Matchers.anyInt());
+        PowerMockito.doReturn(VERSION).when(api).getVppVersion();
+        vppStateReader = VppStateUtils.getVppStateReader(api);
+        readerRegistry = new DelegatingReaderRegistry(Collections.<VppReader<? extends DataObject>>singletonList(vppStateReader));
+    }
+
+    private vppL2Fib[] getL2Fibs() {
+        return new vppL2Fib[] {
+            new vppL2Fib(new byte[]{1,2,3,4,5,6}, true, "ifc1", true, true),
+            new vppL2Fib(new byte[]{2,2,3,4,5,6}, true, "ifc2", true, true),
+        };
+    }
+
+    private void setIfcs(final vppBridgeDomainDetails bdDetails) {
+        final vppBridgeDomainInterfaceDetails ifcDetails = new vppBridgeDomainInterfaceDetails();
+        ifcDetails.interfaceName = "ifc";
+        ifcDetails.splitHorizonGroup = 2;
+        bdDetails.interfaces = new vppBridgeDomainInterfaceDetails[] {ifcDetails};
+    }
+
+    private void setBaseAttrs(final vppBridgeDomainDetails bdDetails, final String bdn, final int i) {
+        bdDetails.name = bdn;
+        bdDetails.arpTerm = true;
+        bdDetails.bdId = i;
+        bdDetails.bviInterfaceName = "ifc";
+        bdDetails.flood = true;
+        bdDetails.forward = true;
+        bdDetails.learn = true;
+        bdDetails.uuFlood = true;
+    }
+
+    @Test
+    public void testReadAll() throws Exception {
+        final Multimap<InstanceIdentifier<? extends DataObject>, ? extends DataObject> dataObjects = readerRegistry.readAll(ctx);
+        assertEquals(dataObjects.size(), 1);
+        final DataObject dataObject = Iterables.getOnlyElement(dataObjects.get(Iterables.getOnlyElement(dataObjects.keySet())));
+        assertTrue(dataObject instanceof VppState);
+        assertVersion((VppState) dataObject);
+        assertEquals(2, ((VppState) dataObject).getBridgeDomains().getBridgeDomain().size());
+    }
+
+    private void assertVersion(final VppState dataObject) {
+        assertEquals(
+            new VersionBuilder()
+                .setName("test")
+                .setBuildDirectory("1")
+                .setBranch("2")
+                .setBuildDate("33")
+                .build(),
+            dataObject.getVersion());
+    }
+
+    @Test
+    public void testReadSpecific() throws Exception {
+        final Optional<? extends DataObject> read = readerRegistry.read(InstanceIdentifier.create(VppState.class), ctx);
+        assertTrue(read.isPresent());
+        assertVersion((VppState) read.get());
+    }
+
+    @Test
+    public void testReadBridgeDomains() throws Exception {
+        VppState readRoot = (VppState) readerRegistry.read(InstanceIdentifier.create(VppState.class), ctx).get();
+
+        Optional<? extends DataObject> read =
+            readerRegistry.read(InstanceIdentifier.create(VppState.class).child(BridgeDomains.class), ctx);
+        assertTrue(read.isPresent());
+        assertEquals(readRoot.getBridgeDomains(), read.get());
+    }
+
+    /**
+     * L2fib does not have a dedicated reader, relying on auto filtering
+     */
+    @Test
+    public void testReadL2Fib() throws Exception {
+        // Deep child without a dedicated reader with specific l2fib key
+        Optional<? extends DataObject> read =
+            readerRegistry.read(InstanceIdentifier.create(VppState.class).child(BridgeDomains.class).child(
+                BridgeDomain.class, new BridgeDomainKey("bdn1"))
+                .child(L2Fib.class, new L2FibKey(new PhysAddress("01:02:03:04:05:06"))), ctx);
+        assertTrue(read.isPresent());
+
+        // non existing l2fib
+        read =
+            readerRegistry.read(InstanceIdentifier.create(VppState.class).child(BridgeDomains.class).child(
+                BridgeDomain.class, new BridgeDomainKey("bdn1"))
+                .child(L2Fib.class, new L2FibKey(new PhysAddress("FF:FF:FF:04:05:06"))), ctx);
+        assertFalse(read.isPresent());
+    }
+
+    @Test
+    public void testReadBridgeDomainAll() throws Exception {
+        VppState readRoot = (VppState) readerRegistry.read(InstanceIdentifier.create(VppState.class), ctx).get();
+
+        final CompositeListVppReader<BridgeDomain, BridgeDomainKey, BridgeDomainBuilder> bridgeDomainReader =
+            VppStateUtils.getBridgeDomainReader(api);
+
+        final List<BridgeDomain> read =
+            bridgeDomainReader.readList(InstanceIdentifier.create(VppState.class).child(BridgeDomains.class).child(
+                BridgeDomain.class), ctx);
+
+        assertEquals(readRoot.getBridgeDomains().getBridgeDomain(), read);
+    }
+
+    @Test
+    public void testReadBridgeDomain() throws Exception {
+        VppState readRoot = (VppState) readerRegistry.read(InstanceIdentifier.create(VppState.class), ctx).get();
+
+        final Optional<? extends DataObject> read =
+            readerRegistry.read(InstanceIdentifier.create(VppState.class).child(BridgeDomains.class).child(
+                BridgeDomain.class, new BridgeDomainKey("bdn1")), ctx);
+
+        assertTrue(read.isPresent());
+        assertEquals(Iterables.find(readRoot.getBridgeDomains().getBridgeDomain(), new Predicate<BridgeDomain>() {
+            @Override
+            public boolean apply(final BridgeDomain input) {
+                return input.getKey().getName().equals("bdn1");
+            }
+        }), read.get());
+    }
+
+    // FIXME
+    @Ignore("Bridge domain customizer does not check whether the bd exists or not and fails with NPE, add it there")
+    @Test
+    public void testReadBridgeDomainNotExisting() throws Exception {
+        final Optional<? extends DataObject> read =
+            readerRegistry.read(InstanceIdentifier.create(VppState.class).child(BridgeDomains.class).child(
+                BridgeDomain.class, new BridgeDomainKey("NOT EXISTING")), ctx);
+        assertFalse(read.isPresent());
+    }
+
+    @Test
+    public void testReadVersion() throws Exception {
+        VppState readRoot = (VppState) readerRegistry.read(InstanceIdentifier.create(VppState.class), ctx).get();
+
+        Optional<? extends DataObject> read =
+            readerRegistry.read(InstanceIdentifier.create(VppState.class).child(Version.class), ctx);
+        assertTrue(read.isPresent());
+        assertEquals(readRoot.getVersion(), read.get());
+    }
+}
\ No newline at end of file
diff --git a/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/VppStateUtils.java b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/VppStateUtils.java
new file mode 100644
index 000000000..7d5441769
--- /dev/null
+++ b/v3po/v3po2vpp/src/test/java/io/fd/honeycomb/v3po/vpp/facade/v3po/vppstate/VppStateUtils.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.facade.v3po.vppstate;
+
+import io.fd.honeycomb.v3po.vpp.facade.impl.read.CompositeChildVppReader;
+import io.fd.honeycomb.v3po.vpp.facade.impl.read.CompositeListVppReader;
+import io.fd.honeycomb.v3po.vpp.facade.impl.read.CompositeRootVppReader;
+import io.fd.honeycomb.v3po.vpp.facade.impl.read.util.ReflexiveChildReaderCustomizer;
+import io.fd.honeycomb.v3po.vpp.facade.impl.read.util.ReflexiveRootReaderCustomizer;
+import io.fd.honeycomb.v3po.vpp.facade.impl.util.VppRWUtils;
+import io.fd.honeycomb.v3po.vpp.facade.read.ChildVppReader;
+import java.util.ArrayList;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppState;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppStateBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.BridgeDomains;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.BridgeDomainsBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.Version;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomain;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomainBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomainKey;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+import org.openvpp.vppjapi.vppApi;
+
+final class VppStateUtils {
+
+    public VppStateUtils() {}
+
+    /**
+     * Create root VppState reader with all its children wired
+     */
+    static CompositeRootVppReader<VppState, VppStateBuilder> getVppStateReader(@Nonnull final vppApi vppApi) {
+
+        final ChildVppReader<Version> versionReader = new CompositeChildVppReader<>(
+            Version.class, new VersionCustomizer(vppApi));
+
+        final CompositeListVppReader<BridgeDomain, BridgeDomainKey, BridgeDomainBuilder> bridgeDomainReader =
+            getBridgeDomainReader(vppApi);
+
+        final ChildVppReader<BridgeDomains> bridgeDomainsReader = new CompositeChildVppReader<>(
+            BridgeDomains.class,
+            VppRWUtils.singletonChildReaderList(bridgeDomainReader),
+            new ReflexiveChildReaderCustomizer<>(BridgeDomainsBuilder.class));
+
+        final List<ChildVppReader<? extends ChildOf<VppState>>> childVppReaders = new ArrayList<>();
+        childVppReaders.add(versionReader);
+        childVppReaders.add(bridgeDomainsReader);
+
+        return new CompositeRootVppReader<>(
+            VppState.class,
+            childVppReaders,
+            VppRWUtils.<VppState>emptyAugReaderList(),
+            new ReflexiveRootReaderCustomizer<>(VppStateBuilder.class));
+    }
+
+    static CompositeListVppReader<BridgeDomain, BridgeDomainKey, BridgeDomainBuilder> getBridgeDomainReader(
+        final @Nonnull vppApi vppApi) {
+        return new CompositeListVppReader<>(
+        BridgeDomain.class,
+        new BridgeDomainCustomizer(vppApi));
+    }
+}