HONEYCOMB-206: change package name to match groupId

Change-Id: I74f769c09e86f08b1753e685a134d20e801bd7da
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

13 files changed, 1153 insertions, 0 deletions

diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/AbstractInterfaceTypeCustomizer.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/AbstractInterfaceTypeCustomizer.java
new file mode 100644
index 000000000..b466fa605
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/AbstractInterfaceTypeCustomizer.java
@@ -0,0 +1,100 @@
+/*
+ * 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.translate.vpp.util;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkState;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.translate.spi.write.WriterCustomizer;
+import io.fd.honeycomb.translate.write.WriteContext;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.InterfaceType;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.openvpp.jvpp.core.future.FutureJVppCore;
+
+/**
+ * Validation WriteCustomizers for Interface subnodes.
+ * Validates the type of interface.
+ */
+public abstract class AbstractInterfaceTypeCustomizer<D extends DataObject>
+        extends FutureJVppCustomizer implements WriterCustomizer<D> {
+
+    protected AbstractInterfaceTypeCustomizer(final FutureJVppCore futureJVppCore) {
+        super(futureJVppCore);
+    }
+
+    private void checkProperInterfaceType(@Nonnull final WriteContext writeContext,
+                                          @Nonnull final InstanceIdentifier<D> id) {
+        final InstanceIdentifier<Interface> ifcTypeFromIid = id.firstIdentifierOf(Interface.class);
+        checkArgument(ifcTypeFromIid != null, "Instance identifier does not contain {} type", Interface.class);
+        checkArgument(id.firstKeyOf(Interface.class) != null, "Instance identifier does not contain keyed {} type",
+                Interface.class);
+        final Optional<Interface> interfaceConfig = writeContext.readAfter(ifcTypeFromIid);
+        checkState(interfaceConfig.isPresent(),
+                "Unable to get Interface configuration for an interface: %s currently being updated", ifcTypeFromIid);
+
+        IllegalInterfaceTypeException
+                .checkInterfaceType(interfaceConfig.get(), getExpectedInterfaceType());
+    }
+
+    protected abstract Class<? extends InterfaceType> getExpectedInterfaceType();
+
+    /**
+     * Validate expected interface type
+     */
+    @Override
+    public final void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataAfter,
+                                             @Nonnull final WriteContext writeContext) throws WriteFailedException {
+        checkProperInterfaceType(writeContext, id);
+        writeInterface(id, dataAfter, writeContext);
+    }
+
+    protected abstract void writeInterface(final InstanceIdentifier<D> id, final D dataAfter,
+                                           final WriteContext writeContext)
+            throws WriteFailedException;
+
+    // Validation for update and delete is not necessary
+
+    /**
+     * Indicates unexpected interface type
+     */
+    protected static final class IllegalInterfaceTypeException extends IllegalArgumentException {
+
+        private IllegalInterfaceTypeException(final String msg) {
+            super(msg);
+        }
+
+        /**
+         * Check the type of interface equals expected type
+         *
+         * @throws IllegalInterfaceTypeException if type of interface is null or not expected
+         */
+        static void checkInterfaceType(@Nonnull final Interface ifc,
+                                       @Nonnull final Class<? extends InterfaceType> expectedType) {
+            if (ifc.getType() == null || !expectedType.equals(ifc.getType())) {
+                throw new IllegalInterfaceTypeException(String.format(
+                        "Unexpected interface type: %s for interface: %s. Expected interface is: %s", ifc.getType(),
+                        ifc.getName(), expectedType));
+            }
+        }
+
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/AddressTranslator.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/AddressTranslator.java
new file mode 100644
index 000000000..c716dd6f1
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/AddressTranslator.java
@@ -0,0 +1,57 @@
+package io.fd.honeycomb.translate.vpp.util;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4AddressNoZone;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6AddressNoZone;
+
+/**
+ * Aggregation trait providing logic for converting address based data
+ */
+public interface AddressTranslator extends Ipv4Translator, Ipv6Translator, MacTranslator {
+
+    default byte[] ipAddressToArray(IpAddress address) {
+        checkNotNull(address, "Cannot resolve null adddress");
+
+        if (isIpv6(address)) {
+            return ipv6AddressNoZoneToArray(new Ipv6AddressNoZone(address.getIpv6Address()));
+        } else {
+            return ipv4AddressNoZoneToArray(new Ipv4AddressNoZone(address.getIpv4Address()));
+        }
+    }
+
+
+    /**
+     * Converts {@link IpAddress} to array representing {@link Ipv4Address} or {@link Ipv6Address}
+     */
+    default byte[] ipAddressToArray(boolean isIpv6, @Nonnull IpAddress address) {
+        checkNotNull(address, "Cannot convert null Address");
+
+        if (isIpv6) {
+            return ipv6AddressNoZoneToArray(new Ipv6AddressNoZone(address.getIpv6Address()));
+        } else {
+            return ipv4AddressNoZoneToArray(new Ipv4AddressNoZone(address.getIpv4Address()));
+        }
+    }
+
+    /**
+     * Converts array bytes to {@link IpAddress}
+     */
+    @Nonnull
+    default IpAddress arrayToIpAddress(boolean isIpv6, byte[] ip) {
+        if (isIpv6) {
+            return new IpAddress(arrayToIpv6AddressNoZone(ip));
+        } else {
+            return new IpAddress(arrayToIpv4AddressNoZone(ip));
+        }
+    }
+
+    default IpAddress reverseAddress(@Nonnull final IpAddress address) {
+        //arrayToIpAdddress internaly reverts order
+        return arrayToIpAddress(isIpv6(address), ipAddressToArray(address));
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/ByteDataTranslator.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/ByteDataTranslator.java
new file mode 100644
index 000000000..b7df219aa
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/ByteDataTranslator.java
@@ -0,0 +1,79 @@
+/*
+ * 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.translate.vpp.util;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+/**
+ * Trait providing logic for working with binary-based data
+ */
+public interface ByteDataTranslator {
+
+    /**
+     * Returns 0 if argument is null or false, 1 otherwise.
+     *
+     * @param value Boolean value to be converted
+     * @return byte value equal to 0 or 1
+     */
+    default byte booleanToByte(@Nullable final Boolean value) {
+        return value != null && value
+                ? (byte) 1
+                : (byte) 0;
+    }
+
+    /**
+     * Returns Boolean.TRUE if argument is 0, Boolean.FALSE otherwise.
+     *
+     * @param value byte value to be converted
+     * @return Boolean value
+     * @throws IllegalArgumentException if argument is neither 0 nor 1
+     */
+    @Nonnull
+    default Boolean byteToBoolean(final byte value) {
+        if (value == 0) {
+            return Boolean.FALSE;
+        } else if (value == 1) {
+            return Boolean.TRUE;
+        }
+        throw new IllegalArgumentException(String.format("0 or 1 was expected but was %d", value));
+    }
+
+    /**
+     * Reverses bytes in the byte array
+     *
+     * @param bytes input array
+     * @return reversed array
+     */
+    default byte[] reverseBytes(final byte[] bytes) {
+        final byte[] reversed = new byte[bytes.length];
+        int i = 1;
+        for (byte aByte : bytes) {
+            reversed[bytes.length - i++] = aByte;
+        }
+
+        return reversed;
+    }
+
+    /**
+     * Return (interned) string from byte array while removing \u0000. Strings represented as fixed length byte[] from
+     * vpp contain \u0000.
+     */
+    default String toString(final byte[] cString) {
+        return new String(cString).replaceAll("\\u0000", "").intern();
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/FutureJVppCustomizer.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/FutureJVppCustomizer.java
new file mode 100644
index 000000000..5885e72a8
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/FutureJVppCustomizer.java
@@ -0,0 +1,44 @@
+/*
+ * 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.translate.vpp.util;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Preconditions;
+import javax.annotation.Nonnull;
+import org.openvpp.jvpp.core.future.FutureJVppCore;
+
+/**
+ * Abstract utility to hold the vppApi reference.
+ */
+@Beta
+public abstract class FutureJVppCustomizer {
+
+    private final FutureJVppCore futureJVppCore;
+
+    public FutureJVppCustomizer(@Nonnull final FutureJVppCore futureJVppCore) {
+        this.futureJVppCore = Preconditions.checkNotNull(futureJVppCore, "futureJVppCore should not be null");
+    }
+
+    /**
+     * Get vppApi reference
+     *
+     * @return vppApi reference
+     */
+    public FutureJVppCore getFutureJVpp() {
+        return futureJVppCore;
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/Ipv4Translator.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/Ipv4Translator.java
new file mode 100644
index 000000000..84b0a2e68
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/Ipv4Translator.java
@@ -0,0 +1,132 @@
+/*
+ * 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.translate.vpp.util;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.net.InetAddresses;
+import java.net.UnknownHostException;
+import java.util.Arrays;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4AddressNoZone;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;
+
+/**
+ * Trait providing logic for translation of ipv4-related data
+ */
+public interface Ipv4Translator extends ByteDataTranslator {
+
+    /**
+     * Creates address array from address part of {@link Ipv4Prefix}
+     */
+    default byte[] ipv4AddressPrefixToArray(@Nonnull final Ipv4Prefix ipv4Prefix) {
+        checkNotNull(ipv4Prefix, "Cannot convert null prefix");
+
+        byte[] retval = new byte[4];
+        String[] address = ipv4Prefix.getValue().substring(0, ipv4Prefix.getValue().indexOf('/')).split("\\.");
+
+        for (int d = 0; d < 4; d++) {
+            retval[d] = (byte) (Short.parseShort(address[d]) & 0xff);
+        }
+        return retval;
+    }
+
+    /**
+     * Extracts {@link Ipv4Prefix} prefix
+     */
+    default byte extractPrefix(Ipv4Prefix data) {
+        checkNotNull(data, "Cannot extract from null");
+
+        return Byte.valueOf(data.getValue().substring(data.getValue().indexOf('/') + 1));
+    }
+
+    /**
+     * Converts byte array to {@link Ipv4Prefix} with specified prefixLength
+     */
+    default Ipv4Prefix arrayToIpv4Prefix(final byte[] address, byte prefixLength) {
+        Ipv4AddressNoZone addressPart = arrayToIpv4AddressNoZone(address);
+
+        return new Ipv4Prefix(addressPart.getValue().concat("/").concat(String.valueOf(prefixLength)));
+    }
+
+    /**
+     * Parse byte array returned by VPP representing an Ipv4 address. Vpp returns IP byte arrays in reversed order.
+     *
+     * @return Ipv4AddressNoZone containing string representation of IPv4 address constructed from submitted bytes. No
+     * change in order.
+     */
+    @Nonnull
+    default Ipv4AddressNoZone arrayToIpv4AddressNoZone(@Nonnull byte[] ip) {
+        // VPP sends ipv4 in a 16 byte array
+        if (ip.length == 16) {
+            ip = Arrays.copyOfRange(ip, 0, 4);
+        }
+        try {
+            // Not reversing the byte array here!! because the IP coming from VPP is in reversed byte order
+            // compared to byte order it was submitted
+            return new Ipv4AddressNoZone(InetAddresses.toAddrString(InetAddresses.fromLittleEndianByteArray(ip)));
+        } catch (UnknownHostException e) {
+            throw new IllegalArgumentException("Unable to parse ipv4", e);
+        }
+    }
+
+    /**
+     * Parse byte array returned by VPP representing an Ipv4 address. Vpp returns IP byte arrays in reversed order.
+     *
+     * @return Ipv4AddressNoZone containing string representation of IPv4 address constructed from submitted bytes. No
+     * change in order.
+     */
+    @Nonnull
+    default Ipv4AddressNoZone arrayToIpv4AddressNoZoneReversed(@Nonnull byte[] ip) {
+        // VPP sends ipv4 in a 16 byte array
+
+        if (ip.length == 16) {
+            ip = Arrays.copyOfRange(ip, 0, 4);
+        }
+
+        ip = reverseBytes(ip);
+
+        try {
+            // Not reversing the byte array here!! because the IP coming from VPP is in reversed byte order
+            // compared to byte order it was submitted
+            return new Ipv4AddressNoZone(InetAddresses.toAddrString(InetAddresses.fromLittleEndianByteArray(ip)));
+        } catch (UnknownHostException e) {
+            throw new IllegalArgumentException("Unable to parse ipv4", e);
+        }
+    }
+
+
+    /**
+     * Transform Ipv4 address to a byte array acceptable by VPP. VPP expects incoming byte array to be in the same order
+     * as the address.
+     *
+     * @return byte array with address bytes
+     */
+    default byte[] ipv4AddressNoZoneToArray(final Ipv4AddressNoZone ipv4Addr) {
+        return ipv4AddressNoZoneToArray(ipv4Addr.getValue());
+    }
+
+    default byte[] ipv4AddressNoZoneToArray(final String ipv4Addr) {
+        byte[] retval = new byte[4];
+        String[] dots = ipv4Addr.split("\\.");
+
+        for (int d = 0; d < 4; d++) {
+            retval[d] = (byte) (Short.parseShort(dots[d]) & 0xff);
+        }
+        return retval;
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/Ipv6Translator.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/Ipv6Translator.java
new file mode 100644
index 000000000..6197b38ef
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/Ipv6Translator.java
@@ -0,0 +1,158 @@
+/*
+ * 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.translate.vpp.util;
+
+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 com.google.common.net.InetAddresses;
+import java.net.UnknownHostException;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import javax.annotation.Nonnull;
+import org.apache.commons.lang3.StringUtils;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6AddressNoZone;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Prefix;
+
+/**
+ * Trait providing logic for translation of ipv6-related data
+ */
+public interface Ipv6Translator extends ByteDataTranslator {
+
+    /**
+     * Transform Ipv6 address to a byte array acceptable by VPP. VPP expects incoming byte array to be in the same order
+     * as the address.
+     *
+     * @return byte array with address bytes
+     */
+    default byte[] ipv6AddressNoZoneToArray(@Nonnull final Ipv6AddressNoZone ipv6Addr) {
+        byte[] retval = new byte[16];
+
+        //splits address and add ommited zeros for easier parsing
+        List<String> segments = Arrays.asList(ipv6Addr.getValue().split(":"))
+                .stream()
+                .map(segment -> StringUtils.repeat('0', 4 - segment.length()) + segment)
+                .collect(Collectors.toList());
+
+        byte index = 0;
+        for (String segment : segments) {
+
+            String firstPart = segment.substring(0, 2);
+            String secondPart = segment.substring(2);
+
+            //first part should be ommited
+            if ("00".equals(firstPart)) {
+                index++;
+            } else {
+                retval[index++] = ((byte) Short.parseShort(firstPart, 16));
+            }
+
+            retval[index++] = ((byte) Short.parseShort(secondPart, 16));
+        }
+
+        return retval;
+    }
+
+    /**
+     * Creates address array from address part of {@link Ipv6Prefix}
+     */
+    default byte[] ipv6AddressPrefixToArray(@Nonnull final Ipv6Prefix ipv4Prefix) {
+        checkNotNull(ipv4Prefix, "Cannot convert null prefix");
+
+        return ipv6AddressNoZoneToArray(new Ipv6AddressNoZone(
+                new Ipv6Address(ipv4Prefix.getValue().substring(0, ipv4Prefix.getValue().indexOf('/')))));
+    }
+
+    /**
+     * Extracts {@link Ipv6Prefix} prefix
+     */
+    default byte extractPrefix(Ipv6Prefix data) {
+        checkNotNull(data, "Cannot extract from null");
+
+        return Byte.valueOf(data.getValue().substring(data.getValue().indexOf('/') + 1));
+    }
+
+    /**
+     * Converts byte array to {@link Ipv6Prefix} with specified prefixLength
+     */
+    default Ipv6Prefix arrayToIpv6Prefix(final byte[] address, byte prefixLength) {
+        Ipv6AddressNoZone addressPart = arrayToIpv6AddressNoZone(address);
+
+        return new Ipv6Prefix(addressPart.getValue().concat("/").concat(String.valueOf(prefixLength)));
+    }
+
+    /**
+     * Parse byte array returned by VPP representing an Ipv6 address. Vpp returns IP byte arrays in reversed order.
+     *
+     * @return Ipv46ddressNoZone containing string representation of IPv6 address constructed from submitted bytes. No
+     * change in order.
+     */
+    @Nonnull
+    default Ipv6AddressNoZone arrayToIpv6AddressNoZone(@Nonnull byte[] ip) {
+        checkArgument(ip.length == 16, "Illegal array length");
+
+        try {
+            return new Ipv6AddressNoZone(InetAddresses.toAddrString(InetAddresses.fromLittleEndianByteArray(ip)));
+        } catch (UnknownHostException e) {
+            throw new IllegalArgumentException("Unable to parse ipv6", e);
+        }
+    }
+
+    /**
+     * Detects whether {@code IpAddress} is ipv6
+     */
+    default boolean isIpv6(IpAddress address) {
+        checkNotNull(address, "Address cannot be null");
+
+        checkState(!(address.getIpv4Address() == null && address.getIpv6Address() == null), "Invalid address");
+        return address.getIpv6Address() != null;
+    }
+
+    /**
+     * Parse byte array returned by VPP representing an Ipv6 address. Vpp returns IP byte arrays in natural order.
+     *
+     * @return Ipv46ddressNoZone containing string representation of IPv6 address constructed from submitted bytes. No
+     * change in order.
+     */
+    @Nonnull
+    default Ipv6AddressNoZone arrayToIpv6AddressNoZoneReversed(@Nonnull byte[] ip) {
+        checkArgument(ip.length == 16, "Illegal array length");
+
+        ip = reverseBytes(ip);
+
+        try {
+            return new Ipv6AddressNoZone(InetAddresses.toAddrString(InetAddresses.fromLittleEndianByteArray(ip)));
+        } catch (UnknownHostException e) {
+            throw new IllegalArgumentException("Unable to parse ipv6", e);
+        }
+    }
+
+
+    /**
+     * Detects whether {@code IpPrefix} is ipv6
+     */
+    default boolean isIpv6(IpPrefix address) {
+        checkNotNull(address, "Address cannot be null");
+        checkState(!(address.getIpv4Prefix() == null && address.getIpv6Prefix() == null), "Invalid address");
+        return address.getIpv6Prefix() != null;
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/JvppReplyConsumer.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/JvppReplyConsumer.java
new file mode 100644
index 000000000..47ee5d14f
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/JvppReplyConsumer.java
@@ -0,0 +1,95 @@
+/*
+ * 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.translate.vpp.util;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import javax.annotation.Nonnegative;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.openvpp.jvpp.VppBaseCallException;
+import org.openvpp.jvpp.dto.JVppReply;
+
+/**
+ * Trait providing logic for consuming reply's to jvpp api calls
+ */
+public interface JvppReplyConsumer {
+
+    int DEFAULT_TIMEOUT_IN_SECONDS = 5;
+
+    default <REP extends JVppReply<?>> REP getReplyForWrite(@Nonnull Future<REP> future,
+                                                            @Nonnull final InstanceIdentifier<?> replyType)
+            throws VppBaseCallException, WriteTimeoutException {
+        return getReplyForWrite(future, replyType, DEFAULT_TIMEOUT_IN_SECONDS);
+    }
+
+    default <REP extends JVppReply<?>> REP getReplyForWrite(@Nonnull Future<REP> future,
+                                                            @Nonnull final InstanceIdentifier<?> replyType,
+                                                            @Nonnegative final int timeoutInSeconds)
+            throws VppBaseCallException, WriteTimeoutException {
+        try {
+            return getReply(future, timeoutInSeconds);
+        } catch (TimeoutException e) {
+            throw new WriteTimeoutException(replyType, e);
+        }
+    }
+
+    default <REP extends JVppReply<?>> REP getReplyForRead(@Nonnull Future<REP> future,
+                                                           @Nonnull final InstanceIdentifier<?> replyType)
+            throws VppBaseCallException, ReadTimeoutException {
+        return getReplyForRead(future, replyType, DEFAULT_TIMEOUT_IN_SECONDS);
+    }
+
+    default <REP extends JVppReply<?>> REP getReplyForRead(@Nonnull Future<REP> future,
+                                                           @Nonnull final InstanceIdentifier<?> replyType,
+                                                           @Nonnegative final int timeoutInSeconds)
+            throws VppBaseCallException, ReadTimeoutException {
+        try {
+            return getReply(future, timeoutInSeconds);
+        } catch (TimeoutException e) {
+            throw new ReadTimeoutException(replyType, e);
+        }
+    }
+
+    default <REP extends JVppReply<?>> REP getReply(@Nonnull Future<REP> future)
+            throws TimeoutException, VppBaseCallException {
+        return getReply(future, DEFAULT_TIMEOUT_IN_SECONDS);
+    }
+
+    default <REP extends JVppReply<?>> REP getReply(@Nonnull Future<REP> future,
+                                                    @Nonnegative final int timeoutInSeconds)
+            throws TimeoutException, VppBaseCallException {
+        try {
+            checkArgument(timeoutInSeconds > 0, "Timeout cannot be < 0");
+            return future.get(timeoutInSeconds, TimeUnit.SECONDS);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new IllegalStateException("Interrupted", e);
+        } catch (ExecutionException e) {
+            // Execution exception could generally contains any exception
+            // when using exceptions instead of return codes just rethrow it for processing on corresponding place
+            if (e instanceof ExecutionException && (e.getCause() instanceof VppBaseCallException)) {
+                throw (VppBaseCallException) (e.getCause());
+            }
+            throw new IllegalStateException(e);
+        }
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/MacTranslator.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/MacTranslator.java
new file mode 100644
index 000000000..af26b11b2
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/MacTranslator.java
@@ -0,0 +1,109 @@
+/*
+ * 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.translate.vpp.util;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.base.Splitter;
+import java.util.List;
+import java.util.function.BiConsumer;
+import javax.annotation.Nonnull;
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+
+/**
+ * Trait providing logic for translation of ipv4-related data
+ */
+public interface MacTranslator {
+
+    Splitter COLON_SPLITTER = Splitter.on(':');
+
+    /**
+     * Parse string represented mac address (using ":" as separator) into a byte array
+     */
+    @Nonnull
+    default byte[] parseMac(@Nonnull final String macAddress) {
+        final List<String> parts = COLON_SPLITTER.splitToList(macAddress);
+        checkArgument(parts.size() == 6, "Mac address is expected to have 6 parts but was: %s", macAddress);
+        return parseMacLikeString(parts);
+    }
+
+    default byte[] parseMacLikeString(final List<String> strings) {
+        return strings.stream().limit(6).map(this::parseHexByte).collect(
+                () -> new byte[strings.size()],
+                new BiConsumer<byte[], Byte>() {
+
+                    private int i = -1;
+
+                    @Override
+                    public void accept(final byte[] bytes, final Byte aByte) {
+                        bytes[++i] = aByte;
+                    }
+                },
+                (bytes, bytes2) -> {
+                    throw new UnsupportedOperationException("Parallel collect not supported");
+                });
+    }
+
+    /**
+     * Converts byte array to address string ,not separated with ":"
+     */
+    default String byteArrayToMacUnseparated(byte[] address) {
+        checkArgument(address.length == 6, "Illegal array length");
+        return Hex.encodeHexString(address);
+    }
+
+    /**
+     * Converts byte array to address string ,separated with ":"
+     */
+    default String byteArrayToMacSeparated(byte[] address) {
+        checkArgument(address.length == 6, "Illegal array length");
+
+        String unseparatedAddress = Hex.encodeHexString(address);
+        String separated = "";
+
+        for (int i = 0; i < unseparatedAddress.length(); i = i + 2) {
+            if (i == (unseparatedAddress.length() - 2)) {
+                separated = separated + unseparatedAddress.substring(0 + i, 2 + i);
+            } else {
+                separated = separated + unseparatedAddress.substring(0 + i, 2 + i) + ":";
+            }
+        }
+
+        return separated;
+    }
+
+    /**
+     * Converts MAC string to byte array
+     */
+    default byte[] macToByteArray(String mac) {
+        checkNotNull(mac, "MAC cannot be null");
+
+        mac = mac.replace(":", "");
+
+        try {
+            return Hex.decodeHex(mac.toCharArray());
+        } catch (DecoderException e) {
+            throw new IllegalArgumentException("Unable to convert mac", e);
+        }
+    }
+
+    default byte parseHexByte(final String aByte) {
+        return (byte) Integer.parseInt(aByte, 16);
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/NamingContext.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/NamingContext.java
new file mode 100644
index 000000000..aecd6efef
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/NamingContext.java
@@ -0,0 +1,179 @@
+/*
+ * 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.translate.vpp.util;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkState;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.translate.MappingContext;
+import io.fd.honeycomb.translate.util.RWUtils;
+import java.util.stream.Collector;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.Contexts;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.contexts.NamingContextKey;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.contexts.naming.context.Mappings;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.contexts.naming.context.mappings.Mapping;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.contexts.naming.context.mappings.MappingBuilder;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.contexts.naming.context.mappings.MappingKey;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
+
+/**
+ * Utility adapter on top of {@link MappingContext} storing integer to string mappings according to naming-context yang
+ * model
+ */
+public final class NamingContext implements AutoCloseable {
+
+    private static final Collector<Mapping, ?, Mapping> SINGLE_ITEM_COLLECTOR = RWUtils.singleItemCollector();
+    private final String artificialNamePrefix;
+    private final KeyedInstanceIdentifier<org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.contexts.NamingContext, NamingContextKey>
+            namingContextIid;
+
+    /**
+     * Create new naming context
+     *
+     * @param artificialNamePrefix artificial name to be used for items without a name in VPP (or not provided)
+     * @param instanceName         name of this context instance. Will be used as list item identifier within context
+     *                             data tree
+     */
+    public NamingContext(@Nonnull final String artificialNamePrefix, @Nonnull final String instanceName) {
+        this.artificialNamePrefix = artificialNamePrefix;
+        namingContextIid = InstanceIdentifier.create(Contexts.class).child(
+                org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.contexts.NamingContext.class,
+                new NamingContextKey(instanceName));
+    }
+
+    /**
+     * Retrieve name for mapping stored provided mappingContext instance. If not present, artificial name will be
+     * generated.
+     *
+     * @param index          index of a mapped item
+     * @param mappingContext mapping context providing context data for current transaction
+     * @return name mapped to provided index
+     */
+    @Nonnull
+    public synchronized String getName(final int index, @Nonnull final MappingContext mappingContext) {
+        if (!containsName(index, mappingContext)) {
+            final String artificialName = getArtificialName(index);
+            addName(index, artificialName, mappingContext);
+        }
+
+        final Optional<Mappings> read = mappingContext.read(namingContextIid.child(Mappings.class));
+        checkState(read.isPresent(), "Mapping for index: %s is not present. But should be", index);
+
+        return read.get().getMapping().stream()
+                .filter(mapping -> mapping.getIndex().equals(index))
+                .collect(SINGLE_ITEM_COLLECTOR).getName();
+    }
+
+    /**
+     * Retrieve name for mapping stored provided mappingContext instance. if present
+     *
+     * @param index          index of a mapped item
+     * @param mappingContext mapping context providing context data for current transaction
+     * @return name mapped to provided index
+     */
+    @Nonnull
+    public synchronized Optional<String> getNameIfPresent(final int index,
+                                                          @Nonnull final MappingContext mappingContext) {
+        final Optional<Mappings> read = mappingContext.read(namingContextIid.child(Mappings.class));
+
+        return read.isPresent()
+                ? Optional.of(read.get().getMapping().stream()
+                .filter(mapping -> mapping.getIndex().equals(index))
+                .collect(SINGLE_ITEM_COLLECTOR)
+                .getName())
+                : Optional.absent();
+    }
+
+    /**
+     * Check whether mapping is present for index.
+     *
+     * @param index          index of a mapped item
+     * @param mappingContext mapping context providing context data for current transaction
+     * @return true if present, false otherwise
+     */
+    public synchronized boolean containsName(final int index, @Nonnull final MappingContext mappingContext) {
+        final Optional<Mappings> read = mappingContext.read(namingContextIid.child(Mappings.class));
+        return read.isPresent()
+                ? read.get().getMapping().stream().anyMatch(mapping -> mapping.getIndex().equals(index))
+                : false;
+    }
+
+
+    /**
+     * Add mapping to current context
+     *
+     * @param index          index of a mapped item
+     * @param name           name of a mapped item
+     * @param mappingContext mapping context providing context data for current transaction
+     */
+    public synchronized void addName(final int index, final String name, final MappingContext mappingContext) {
+        final KeyedInstanceIdentifier<Mapping, MappingKey> mappingIid = getMappingIid(name);
+        mappingContext.put(mappingIid, new MappingBuilder().setIndex(index).setName(name).build());
+    }
+
+    private KeyedInstanceIdentifier<Mapping, MappingKey> getMappingIid(final String name) {
+        return namingContextIid.child(Mappings.class).child(Mapping.class, new MappingKey(name));
+    }
+
+    /**
+     * Remove mapping from current context
+     *
+     * @param name           name of a mapped item
+     * @param mappingContext mapping context providing context data for current transaction
+     */
+    public synchronized void removeName(final String name, final MappingContext mappingContext) {
+        mappingContext.delete(getMappingIid(name));
+    }
+
+    /**
+     * Returns index value associated with the given name.
+     *
+     * @param name           the name whose associated index value is to be returned
+     * @param mappingContext mapping context providing context data for current transaction
+     * @return integer index value matching supplied name
+     * @throws IllegalArgumentException if name was not found
+     */
+    public synchronized int getIndex(final String name, final MappingContext mappingContext) {
+        final Optional<Mapping> read = mappingContext.read(getMappingIid(name));
+        checkArgument(read.isPresent(), "No mapping stored for name: %s", name);
+        return read.get().getIndex();
+
+    }
+
+    /**
+     * Check whether mapping is present for name.
+     *
+     * @param name           name of a mapped item
+     * @param mappingContext mapping context providing context data for current transaction
+     * @return true if present, false otherwise
+     */
+    public synchronized boolean containsIndex(final String name, final MappingContext mappingContext) {
+        return mappingContext.read(getMappingIid(name)).isPresent();
+    }
+
+    private String getArtificialName(final int index) {
+        return artificialNamePrefix + index;
+    }
+
+    @Override
+    public void close() throws Exception {
+        /// Not removing the mapping from backing storage
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/ReadTimeoutException.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/ReadTimeoutException.java
new file mode 100644
index 000000000..cacca39f5
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/ReadTimeoutException.java
@@ -0,0 +1,33 @@
+/*
+ * 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.translate.vpp.util;
+
+import com.google.common.annotations.Beta;
+import io.fd.honeycomb.translate.read.ReadFailedException;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Thrown when read method invocation times out.
+ */
+@Beta
+public class ReadTimeoutException extends ReadFailedException {
+
+    public ReadTimeoutException(final InstanceIdentifier<?> id, final Throwable cause) {
+        super(id, cause);
+    }
+
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/TagRewriteOperation.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/TagRewriteOperation.java
new file mode 100644
index 000000000..0bfd28587
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/TagRewriteOperation.java
@@ -0,0 +1,88 @@
+/*
+ * 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.translate.vpp.util;
+
+import com.google.common.base.Preconditions;
+import com.google.common.primitives.UnsignedBytes;
+import javax.annotation.Nonnegative;
+import javax.annotation.Nullable;
+
+/**
+ * Defines vlan tag rewrite config options for VPP.
+ * <p/>
+ * TODO HONEYCOMB-184 corresponding enum (defined in l2_vtr.h) should be defined in vpe.api
+ * (does vpp's IDL support enum type definition?)
+ * which would allow to generate this class in jvpp
+ */
+public enum TagRewriteOperation {
+    disabled(0),
+    push_1(0),
+    push_2(0),
+    pop_1(1),
+    pop_2(2),
+    translate_1_to_1(1),
+    translate_1_to_2(1),
+    translate_2_to_1(2),
+    translate_2_to_2(2);
+
+    private static final int MAX_INDEX = 3;
+    private static TagRewriteOperation[][] translation = new TagRewriteOperation[][]{
+            {disabled, push_1, push_2},
+            {pop_1, translate_1_to_1, translate_1_to_2},
+            {pop_2, translate_2_to_1, translate_2_to_2}
+    };
+    private final int code;
+    private final byte popTags;
+
+    TagRewriteOperation(final int popTags) {
+        this.code = this.ordinal();
+        this.popTags = UnsignedBytes.checkedCast(popTags);
+    }
+
+    /**
+     * Returns VPP tag rewrite operation for given number of tags to pop and tags to push.
+     *
+     * @param toPop  number of tags to pop (0..2)
+     * @param toPush number of tags to push (0..2)
+     * @return vpp tag rewrite operation for given input parameters
+     */
+    public static TagRewriteOperation get(@Nonnegative final int toPop, @Nonnegative final int toPush) {
+        Preconditions.checkElementIndex(toPop, MAX_INDEX, "Illegal number of tags to pop");
+        Preconditions.checkElementIndex(toPush, MAX_INDEX, "Illegal number of tags to push");
+        return translation[toPop][toPush];
+    }
+
+    /**
+     * Returns VPP tag rewrite operation for given operation code.
+     *
+     * @param code VPP tag rewrite operation code
+     * @return vpp tag rewrite operation for given input parameter
+     */
+    @Nullable
+    public static TagRewriteOperation get(@Nonnegative final int code) {
+        for (TagRewriteOperation operation : TagRewriteOperation.values()) {
+            if (code == operation.code) {
+                return operation;
+            }
+        }
+        return null;
+    }
+
+    public byte getPopTags() {
+        return popTags;
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/VppStatusListener.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/VppStatusListener.java
new file mode 100644
index 000000000..1ea196651
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/VppStatusListener.java
@@ -0,0 +1,46 @@
+/*
+ * 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.translate.vpp.util;
+
+import io.fd.honeycomb.translate.util.read.KeepaliveReaderWrapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Listens to vpp status changes. Restarts honeycomb if vpp is down.
+ */
+public final class VppStatusListener implements KeepaliveReaderWrapper.KeepaliveFailureListener {
+
+    /**
+     * Value picked up by honeycomb start script, tigers honeycomb restart when returned by the java process
+     */
+    public static final int RESTART_ERROR_CODE = 100;
+    private static final Logger LOG = LoggerFactory.getLogger(VppStatusListener.class);
+
+    private volatile boolean down;
+
+    public boolean isDown() {
+        return down;
+    }
+
+    @Override
+    public void onKeepaliveFailure() {
+        LOG.error("Keepalive failed. VPP is probably DOWN! Restarting Honeycomb");
+        this.down = true;
+        System.exit(RESTART_ERROR_CODE);
+    }
+}
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/WriteTimeoutException.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/WriteTimeoutException.java
new file mode 100644
index 000000000..7d5bac3d0
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/vpp/util/WriteTimeoutException.java
@@ -0,0 +1,33 @@
+/*
+ * 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.translate.vpp.util;
+
+import com.google.common.annotations.Beta;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Thrown when write method invocation times out.
+ */
+@Beta
+public class WriteTimeoutException extends WriteFailedException {
+
+    public WriteTimeoutException(final InstanceIdentifier<?> id, final Throwable cause) {
+        super(id, cause);
+    }
+
+}