HC2VPP-7 - Split vpp state/Cli RPC to separate module

Introduces VppManageModule containing
- Vpp state attributes
- CLI RPC support
- Keep-alive

Change-Id: I8907e57132cc9e57840aa3b9607fa131a77f767d
Signed-off-by: Jan Srnicek <jsrnicek@cisco.com>

10 files changed, 553 insertions, 0 deletions

diff --git a/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/VppManagementConfiguration.java b/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/VppManagementConfiguration.java
new file mode 100644
index 000000000..53872f16e
--- /dev/null
+++ b/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/VppManagementConfiguration.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2017 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.hc2vpp.management;
+
+import net.jmob.guice.conf.core.BindConfig;
+import net.jmob.guice.conf.core.InjectConfig;
+import net.jmob.guice.conf.core.Syntax;
+
+@BindConfig(value = "vpp-management", syntax = Syntax.JSON)
+public class VppManagementConfiguration {
+
+    @InjectConfig("keepalive-delay")
+    private int keepaliveDelay;
+
+    public int getKeepaliveDelay() {
+        return this.keepaliveDelay;
+    }
+}
diff --git a/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/VppManagementModule.java b/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/VppManagementModule.java
new file mode 100644
index 000000000..508da64d0
--- /dev/null
+++ b/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/VppManagementModule.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2017 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.hc2vpp.management;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.multibindings.Multibinder;
+import io.fd.hc2vpp.management.rpc.CliInbandService;
+import io.fd.hc2vpp.management.state.StateReaderFactory;
+import io.fd.honeycomb.rpc.RpcService;
+import io.fd.honeycomb.translate.read.ReaderFactory;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import net.jmob.guice.conf.core.ConfigurationModule;
+
+public class VppManagementModule extends AbstractModule {
+
+    @Override
+    protected void configure() {
+        install(ConfigurationModule.create());
+        requestInjection(VppManagementConfiguration.class);
+
+        // Readers
+        final Multibinder<ReaderFactory> readerFactoryBinder = Multibinder.newSetBinder(binder(), ReaderFactory.class);
+        readerFactoryBinder.addBinding().to(StateReaderFactory.class);
+
+        // Executor needed for keepalives
+        bind(ScheduledExecutorService.class).toInstance(Executors.newScheduledThreadPool(1));
+
+        // RPCs
+        final Multibinder<RpcService> rpcsBinder = Multibinder.newSetBinder(binder(), RpcService.class);
+        rpcsBinder.addBinding().to(CliInbandService.class);
+    }
+}
diff --git a/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/rpc/CliInbandService.java b/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/rpc/CliInbandService.java
new file mode 100644
index 000000000..ab55abe3f
--- /dev/null
+++ b/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/rpc/CliInbandService.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2017 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.hc2vpp.management.rpc;
+
+import com.google.inject.Inject;
+import io.fd.hc2vpp.common.translate.util.JvppReplyConsumer;
+import io.fd.honeycomb.rpc.RpcService;
+import io.fd.vpp.jvpp.core.dto.CliInband;
+import io.fd.vpp.jvpp.core.future.FutureJVppCore;
+import java.nio.charset.StandardCharsets;
+import java.util.concurrent.CompletionStage;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.CliInbandInput;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.CliInbandOutput;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.CliInbandOutputBuilder;
+import org.opendaylight.yangtools.yang.common.QName;
+import org.opendaylight.yangtools.yang.model.api.SchemaPath;
+
+public class CliInbandService implements RpcService<CliInbandInput, CliInbandOutput>, JvppReplyConsumer {
+
+    private final FutureJVppCore jvpp;
+    private static final String localName = "cli-inband";
+    private static final QName name = QName.create(CliInbandInput.QNAME, localName);
+    private static final SchemaPath schemaPath = SchemaPath.ROOT.createChild(name);
+
+    @Inject
+    public CliInbandService(@Nonnull final FutureJVppCore jvpp) {
+        this.jvpp = jvpp;
+    }
+
+    @Override
+    @Nonnull
+    public CompletionStage<CliInbandOutput> invoke(@Nonnull final CliInbandInput input) {
+        final CliInband request = new CliInband();
+        request.cmd = input.getCmd().getBytes(StandardCharsets.UTF_8);
+        request.length = request.cmd.length;
+        return jvpp.cliInband(request)
+            .thenApply(
+                reply -> new CliInbandOutputBuilder().setReply(new String(reply.reply)).build()
+            );
+    }
+
+    @Nonnull
+    @Override
+    public SchemaPath getManagedNode() {
+        return schemaPath;
+    }
+}
diff --git a/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/state/StateReaderFactory.java b/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/state/StateReaderFactory.java
new file mode 100644
index 000000000..541de30a1
--- /dev/null
+++ b/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/state/StateReaderFactory.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2017 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.hc2vpp.management.state;
+
+import com.google.inject.Inject;
+import io.fd.hc2vpp.common.translate.util.ReadTimeoutException;
+import io.fd.hc2vpp.common.translate.util.VppStatusListener;
+import io.fd.hc2vpp.management.VppManagementConfiguration;
+import io.fd.honeycomb.translate.impl.read.GenericReader;
+import io.fd.honeycomb.translate.read.ReaderFactory;
+import io.fd.honeycomb.translate.read.registry.ModifiableReaderRegistryBuilder;
+import io.fd.honeycomb.translate.util.read.KeepaliveReaderWrapper;
+import io.fd.vpp.jvpp.core.future.FutureJVppCore;
+import java.util.concurrent.ScheduledExecutorService;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.VppState;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.VppStateBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.vpp.state.Version;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class StateReaderFactory implements ReaderFactory {
+
+    @Inject
+    private FutureJVppCore vppApi;
+
+    @Inject
+    private ScheduledExecutorService keepaliveExecutor;
+
+    @Inject
+    private VppStatusListener vppStatusListener;
+
+    @Inject
+    private VppManagementConfiguration configuration;
+
+    @Override
+    public void init(@Nonnull final ModifiableReaderRegistryBuilder registry) {
+        // VppState(Structural)
+        final InstanceIdentifier<VppState> vppStateId = InstanceIdentifier.create(VppState.class);
+        registry.addStructuralReader(vppStateId, VppStateBuilder.class);
+        //  Version
+        // Wrap with keepalive reader to detect connection issues
+        // Relying on VersionCustomizer to provide a "timing out read"
+        registry.add(new KeepaliveReaderWrapper<>(
+                new GenericReader<>(vppStateId.child(Version.class), new VersionCustomizer(vppApi)),
+                keepaliveExecutor, ReadTimeoutException.class, configuration.getKeepaliveDelay(), vppStatusListener));
+    }
+}
diff --git a/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/state/VersionCustomizer.java b/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/state/VersionCustomizer.java
new file mode 100644
index 000000000..bfbabcb0c
--- /dev/null
+++ b/vpp-management/impl/src/main/java/io/fd/hc2vpp/management/state/VersionCustomizer.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2017 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.hc2vpp.management.state;
+
+import com.google.common.primitives.UnsignedInts;
+import io.fd.honeycomb.translate.read.ReadContext;
+import io.fd.honeycomb.translate.read.ReadFailedException;
+import io.fd.honeycomb.translate.spi.read.ReaderCustomizer;
+import io.fd.hc2vpp.common.translate.util.ByteDataTranslator;
+import io.fd.hc2vpp.common.translate.util.FutureJVppCustomizer;
+import io.fd.hc2vpp.common.translate.util.JvppReplyConsumer;
+import io.fd.vpp.jvpp.core.dto.ShowVersion;
+import io.fd.vpp.jvpp.core.dto.ShowVersionReply;
+import io.fd.vpp.jvpp.core.future.FutureJVppCore;
+import io.fd.vpp.jvpp.dto.ControlPing;
+import io.fd.vpp.jvpp.dto.ControlPingReply;
+import io.fd.vpp.jvpp.dto.JVppReply;
+import java.util.concurrent.CompletionStage;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.VppStateBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.vpp.state.Version;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.vpp.state.VersionBuilder;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public final class VersionCustomizer
+        extends FutureJVppCustomizer
+        implements ReaderCustomizer<Version, VersionBuilder>, ByteDataTranslator, JvppReplyConsumer {
+
+    public VersionCustomizer(@Nonnull final FutureJVppCore futureJVppCore) {
+        super(futureJVppCore);
+    }
+
+    @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 final InstanceIdentifier<Version> id, @Nonnull final VersionBuilder builder,
+                                      @Nonnull final ReadContext context) throws ReadFailedException {
+
+        // Execute with timeout
+        final CompletionStage<ShowVersionReply> showVersionFuture = getFutureJVpp().showVersion(new ShowVersion());
+        final ShowVersionReply reply = getReplyForRead(showVersionFuture.toCompletableFuture(), id);
+
+        builder.setBranch(toString(reply.version));
+        builder.setName(toString(reply.program));
+        builder.setBuildDate(toString(reply.buildDate));
+        builder.setBuildDirectory(toString(reply.buildDirectory));
+        builder.setPid(getPid(id));
+    }
+
+    private Long getPid(@Nonnull final InstanceIdentifier<Version> id) throws ReadFailedException {
+        final CompletionStage<JVppReply<ControlPing>> request = getFutureJVpp().send(new ControlPing());
+        final ControlPingReply reply = (ControlPingReply)getReplyForRead(request.toCompletableFuture(), id);
+        return UnsignedInts.toLong(reply.vpePid);
+    }
+
+
+}
diff --git a/vpp-management/impl/src/main/resources/honeycomb-minimal-resources/config/vpp-management.json b/vpp-management/impl/src/main/resources/honeycomb-minimal-resources/config/vpp-management.json
new file mode 100644
index 000000000..28b25b263
--- /dev/null
+++ b/vpp-management/impl/src/main/resources/honeycomb-minimal-resources/config/vpp-management.json
@@ -0,0 +1,3 @@
+{
+  "keepalive-delay":30
+}
\ No newline at end of file
diff --git a/vpp-management/impl/src/test/java/io/fd/hc2vpp/management/VppManagementModuleTest.java b/vpp-management/impl/src/test/java/io/fd/hc2vpp/management/VppManagementModuleTest.java
new file mode 100644
index 000000000..eb2c3a933
--- /dev/null
+++ b/vpp-management/impl/src/test/java/io/fd/hc2vpp/management/VppManagementModuleTest.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2017 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.hc2vpp.management;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.mockito.MockitoAnnotations.initMocks;
+
+import com.google.inject.Guice;
+import com.google.inject.Inject;
+import com.google.inject.testing.fieldbinder.Bind;
+import com.google.inject.testing.fieldbinder.BoundFieldModule;
+import io.fd.honeycomb.translate.impl.read.registry.CompositeReaderRegistryBuilder;
+import io.fd.honeycomb.translate.read.ReaderFactory;
+import io.fd.vpp.jvpp.core.future.FutureJVppCore;
+import java.util.HashSet;
+import java.util.Set;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mock;
+
+public class VppManagementModuleTest {
+
+    @Bind
+    @Mock
+    private FutureJVppCore futureJVppCore;
+
+    @Inject
+    private VppManagementConfiguration configuration;
+
+    @Inject
+    private Set<ReaderFactory> readerFactories = new HashSet<>();
+
+    @Before
+    public void setUp() {
+        initMocks(this);
+        Guice.createInjector(new VppManagementModule(), BoundFieldModule.of(this)).injectMembers(this);
+    }
+
+    @Test
+    public void testReaderFactories() throws Exception {
+        assertFalse(readerFactories.isEmpty());
+
+        // Test registration process (all dependencies present, topological order of readers does exist, etc.)
+        final CompositeReaderRegistryBuilder registryBuilder = new CompositeReaderRegistryBuilder();
+        readerFactories.stream().forEach(factory -> factory.init(registryBuilder));
+        assertNotNull(registryBuilder.build());
+    }
+
+    @Test
+    public void testConfiguration() {
+        assertEquals(30, configuration.getKeepaliveDelay());
+    }
+}
\ No newline at end of file
diff --git a/vpp-management/impl/src/test/java/io/fd/hc2vpp/management/rpc/CliInbandServiceTest.java b/vpp-management/impl/src/test/java/io/fd/hc2vpp/management/rpc/CliInbandServiceTest.java
new file mode 100644
index 000000000..dcf0a0186
--- /dev/null
+++ b/vpp-management/impl/src/test/java/io/fd/hc2vpp/management/rpc/CliInbandServiceTest.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2017 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.hc2vpp.management.rpc;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.when;
+import static org.mockito.MockitoAnnotations.initMocks;
+
+import io.fd.hc2vpp.common.test.util.FutureProducer;
+import io.fd.vpp.jvpp.core.dto.CliInbandReply;
+import io.fd.vpp.jvpp.core.future.FutureJVppCore;
+import org.junit.Test;
+import org.mockito.Mock;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.CliInbandInput;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.CliInbandInputBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.CliInbandOutput;
+
+public class CliInbandServiceTest implements FutureProducer {
+
+    @Mock
+    private FutureJVppCore api;
+
+    @Test
+    public void testInvoke() throws Exception {
+        initMocks(this);
+        final String replyString = "CLI output";
+
+        final CliInbandService service = new CliInbandService(api);
+        final CliInbandReply reply = new CliInbandReply();
+        reply.reply = replyString.getBytes();
+        when(api.cliInband(any())).thenReturn(future(reply));
+
+        final CliInbandInput request = new CliInbandInputBuilder().setCmd("cmd").build();
+        final CliInbandOutput response = service.invoke(request).toCompletableFuture().get();
+        assertEquals(replyString, response.getReply());
+    }
+}
\ No newline at end of file
diff --git a/vpp-management/impl/src/test/java/io/fd/hc2vpp/management/state/VppStateTest.java b/vpp-management/impl/src/test/java/io/fd/hc2vpp/management/state/VppStateTest.java
new file mode 100644
index 000000000..81db88511
--- /dev/null
+++ b/vpp-management/impl/src/test/java/io/fd/hc2vpp/management/state/VppStateTest.java
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2017 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.hc2vpp.management.state;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.when;
+import static org.mockito.MockitoAnnotations.initMocks;
+
+import com.google.common.base.Optional;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Multimap;
+import io.fd.hc2vpp.common.test.util.FutureProducer;
+import io.fd.honeycomb.translate.MappingContext;
+import io.fd.honeycomb.translate.ModificationCache;
+import io.fd.honeycomb.translate.impl.read.GenericReader;
+import io.fd.honeycomb.translate.impl.read.registry.CompositeReaderRegistryBuilder;
+import io.fd.honeycomb.translate.read.ReadContext;
+import io.fd.honeycomb.translate.read.registry.ReaderRegistry;
+import io.fd.vpp.jvpp.core.dto.ShowVersion;
+import io.fd.vpp.jvpp.core.dto.ShowVersionReply;
+import io.fd.vpp.jvpp.core.future.FutureJVppCore;
+import io.fd.vpp.jvpp.dto.ControlPing;
+import io.fd.vpp.jvpp.dto.ControlPingReply;
+import javax.annotation.Nonnull;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.ArgumentMatchers;
+import org.mockito.Mock;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.VppState;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.VppStateBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.vpp.state.Version;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.management.rev170315.vpp.state.VersionBuilder;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class VppStateTest implements FutureProducer {
+
+    @Mock
+    private FutureJVppCore api;
+    @Mock
+    private ReadContext ctx;
+    @Mock
+    private MappingContext mappingContext;
+
+    private ReaderRegistry readerRegistry;
+
+    /**
+     * Create root VppState reader with all its children wired.
+     */
+    private static ReaderRegistry getVppStateReader(@Nonnull final FutureJVppCore jVpp) {
+        final CompositeReaderRegistryBuilder registry = new CompositeReaderRegistryBuilder();
+
+        // VppState(Structural)
+        final InstanceIdentifier<VppState> vppStateId = InstanceIdentifier.create(VppState.class);
+        registry.addStructuralReader(vppStateId, VppStateBuilder.class);
+        //  Version
+        registry.add(new GenericReader<>(vppStateId.child(Version.class), new VersionCustomizer(jVpp)));
+        return registry.build();
+    }
+
+    @Before
+    public void setUp() throws Exception {
+        initMocks(this);
+        final ModificationCache cache = new ModificationCache();
+        doReturn(cache).when(ctx).getModificationCache();
+        doReturn(mappingContext).when(ctx).getMappingContext();
+
+
+        readerRegistry = getVppStateReader(api);
+    }
+
+    private static Version getVersion() {
+        return new VersionBuilder()
+                .setName("test")
+                .setBuildDirectory("1")
+                .setBranch("2")
+                .setBuildDate("3")
+                .setPid(0L)
+                .build();
+    }
+
+    private void whenShowVersionThenReturn(final Version version) {
+        final ShowVersionReply reply = new ShowVersionReply();
+        reply.buildDate = version.getBuildDate().getBytes();
+        reply.program = version.getName().getBytes();
+        reply.version = version.getBranch().getBytes();
+        reply.buildDirectory = version.getBuildDirectory().getBytes();
+        when(api.showVersion(ArgumentMatchers.any(ShowVersion.class))).thenReturn(future(reply));
+        // Version Customizer uses ControlPing to obtain PID
+        when(api.send(ArgumentMatchers.any(ControlPing.class))).thenReturn(future(new ControlPingReply()));
+    }
+
+    @Test
+    public void testReadAll() throws Exception {
+        final Version version = getVersion();
+        whenShowVersionThenReturn(version);
+
+        final Multimap<InstanceIdentifier<? extends DataObject>, ? extends DataObject> dataObjects =
+                readerRegistry.readAll(ctx);
+        assertEquals(dataObjects.size(), 1);
+        final VppState dataObject =
+                (VppState) Iterables.getOnlyElement(dataObjects.get(Iterables.getOnlyElement(dataObjects.keySet())));
+        assertEquals(version, dataObject.getVersion());
+    }
+
+    @Test
+    public void testReadSpecific() throws Exception {
+        final Version version = getVersion();
+        whenShowVersionThenReturn(version);
+
+        final Optional<? extends DataObject> read = readerRegistry.read(InstanceIdentifier.create(VppState.class), ctx);
+        assertTrue(read.isPresent());
+        assertEquals(version, ((VppState) read.get()).getVersion());
+    }
+
+    @Test
+    public void testReadVersion() throws Exception {
+        whenShowVersionThenReturn(getVersion());
+        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/vpp-management/impl/src/test/resources/vpp-management.json b/vpp-management/impl/src/test/resources/vpp-management.json
new file mode 100644
index 000000000..28b25b263
--- /dev/null
+++ b/vpp-management/impl/src/test/resources/vpp-management.json
@@ -0,0 +1,3 @@
+{
+  "keepalive-delay":30
+}
\ No newline at end of file