Squashed commit of the following:

commit 1b4af2baa406841631ef7c3bf6917be654f793e1
Author: Marco Platania <platania@research.att.com>
Date:   Mon Jan 21 11:21:08 2019 -0500

    Correct style issues

    Change-Id: Icadd241369437b6c1e868285f79b31be2d730871
    Issue-ID: INT-824
    Signed-off-by: Marco Platania <platania@research.att.com>

commit 1b019bf2fcdddeae852f465e56255bb00c5c19d7
Author: Marco Platania <platania@research.att.com>
Date:   Mon Jan 21 10:36:52 2019 -0500

    Correct path to POM files

    Change-Id: Ie98617eaab6ae65c982bb15e71f72b090f45e553
    Issue-ID: INT-824
    Signed-off-by: Marco Platania <platania@research.att.com>

commit e51da00e8208fad91ca3be8808b0e7b590d64627
Author: Marco Platania <platania@research.att.com>
Date:   Mon Jan 21 10:24:19 2019 -0500

    Add new API to vPacketGen

    - Add new API to modify the number of active streams
    - Change POM structure accordingly

    Change-Id: Iba45ce2ff5fa9fb418e3dd0dffb75c785dc20f70
    Issue-ID: INT-824
    Signed-off-by: Marco Platania <platania@research.att.com>

Change-Id: Iefbfce87b4f98a35b81585c2346975256ae988a4
Signed-off-by: Marco Platania <platania@research.att.com>

9 files changed, 584 insertions, 0 deletions

diff --git a/vnfs/honeycomb_plugin/stream-count/stream-count-impl/Readme.adoc b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/Readme.adoc
new file mode 100644
index 00000000..5e347d27
--- /dev/null
+++ b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/Readme.adoc
@@ -0,0 +1,3 @@
+--Documentation for stream-count --
+
+TODO Replace with general description whats the purpose of stream-count and how it works
diff --git a/vnfs/honeycomb_plugin/stream-count/stream-count-impl/pom.xml b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/pom.xml
new file mode 100644
index 00000000..25d6d765
--- /dev/null
+++ b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/pom.xml
@@ -0,0 +1,87 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright (c) 2015 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.
+--><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <groupId>io.fd.honeycomb.common</groupId>
+        <artifactId>impl-parent</artifactId>
+        <version>1.16.9</version>
+    </parent>
+
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>io.fd.honeycomb.lcmapi</groupId>
+    <artifactId>stream-count-impl</artifactId>
+    <version>1.16.9</version>
+    <packaging>bundle</packaging>
+
+    <properties>
+        <honeycomb.infra.version>1.16.9</honeycomb.infra.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>stream-count-api</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
+        <!-- Honeycomb infrastructure-->
+        <dependency>
+            <groupId>io.fd.honeycomb</groupId>
+            <artifactId>translate-api</artifactId>
+            <version>${honeycomb.infra.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>io.fd.honeycomb</groupId>
+            <artifactId>translate-spi</artifactId>
+            <version>${honeycomb.infra.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>io.fd.honeycomb</groupId>
+            <artifactId>cfg-init</artifactId>
+            <version>${honeycomb.infra.version}</version>
+        </dependency>
+
+        <!-- DI -->
+        <dependency>
+            <groupId>com.google.inject</groupId>
+            <artifactId>guice</artifactId>
+            <version>${guice.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>net.jmob</groupId>
+            <artifactId>guice.conf</artifactId>
+            <version>${guice.config.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.inject.extensions</groupId>
+            <artifactId>guice-multibindings</artifactId>
+            <version>${guice.version}</version>
+        </dependency>
+    </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-deploy-plugin</artifactId>
+        <configuration>
+          <skip>true</skip>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>
diff --git a/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/CrudService.java b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/CrudService.java
new file mode 100644
index 00000000..b9d7f1bb
--- /dev/null
+++ b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/CrudService.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.lcmapi;
+
+import io.fd.honeycomb.translate.read.ReadFailedException;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Example of an aggregated access interface.
+ * <p/>
+ * Shared by all the customizers hiding the ugly details of our data management.
+ *
+ * TODO update javadoc
+ */
+public interface CrudService<T extends DataObject> {
+
+    /**
+     * Perform write of provided data.
+     */
+    void writeData(@Nonnull final InstanceIdentifier<T> identifier, @Nonnull final T data)
+            throws WriteFailedException;
+
+
+    /**
+     * Perform delete of existing data.
+     */
+    void deleteData(@Nonnull final InstanceIdentifier<T> identifier, @Nonnull final T data)
+            throws WriteFailedException;
+
+    /**
+     * Perform update of existing data.
+     */
+    void updateData(@Nonnull final InstanceIdentifier<T> identifier, @Nonnull final T dataOld,
+                           @Nonnull final T dataNew)
+            throws WriteFailedException;
+
+    /**
+     * Read data identified by provided identifier.
+     */
+    T readSpecific(@Nonnull final InstanceIdentifier<T> identifier) throws ReadFailedException;
+
+    /**
+     * Read all nodes of type {@link T}.
+     */
+    List<T> readAll() throws ReadFailedException;
+}
diff --git a/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/ElementCrudService.java b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/ElementCrudService.java
new file mode 100644
index 00000000..fa6a31d5
--- /dev/null
+++ b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/ElementCrudService.java
@@ -0,0 +1,103 @@
+/*
+ * 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.
+ */
+
+/*
+ * Modifications copyright (c) 2019 AT&T Intellectual Property
+ */
+
+package io.fd.honeycomb.lcmapi;
+
+import io.fd.honeycomb.translate.read.ReadFailedException;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+import java.util.Collections;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.StreamCountState;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.stream.count.params.Streams;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.stream.count.params.StreamsBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.StreamNum;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Simple example of class handling Crud operations for plugin.
+ * <p/>
+ * No real handling, serves just as an illustration.
+ *
+ * TODO update javadoc
+ */
+final class ElementCrudService implements CrudService<Streams> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(ElementCrudService.class);
+
+    @Override
+    public void writeData(@Nonnull final InstanceIdentifier<Streams> identifier, @Nonnull final Streams data)
+            throws WriteFailedException {
+        if (data != null) {
+
+            // Performs any logic needed for persisting such data
+            LOG.info("Writing path[{}] / data [{}]", identifier, data);
+        } else {
+            throw new WriteFailedException.CreateFailedException(identifier, data,
+                    new NullPointerException("Provided data are null"));
+        }
+    }
+
+    @Override
+    public void deleteData(@Nonnull final InstanceIdentifier<Streams> identifier, @Nonnull final Streams data)
+            throws WriteFailedException {
+        if (data != null) {
+
+            // Performs any logic needed for persisting such data
+            LOG.info("Removing path[{}] / data [{}]", identifier, data);
+        } else {
+            throw new WriteFailedException.DeleteFailedException(identifier,
+                    new NullPointerException("Provided data are null"));
+        }
+    }
+
+    @Override
+    public void updateData(@Nonnull final InstanceIdentifier<Streams> identifier, @Nonnull final Streams dataOld,
+                           @Nonnull final Streams dataNew) throws WriteFailedException {
+        if (dataOld != null && dataNew != null) {
+
+            // Performs any logic needed for persisting such data
+            LOG.info("Update path[{}] from [{}] to [{}]", identifier, dataOld, dataNew);
+        } else {
+            throw new WriteFailedException.DeleteFailedException(identifier,
+                    new NullPointerException("Provided data are null"));
+        }
+    }
+
+    @Override
+    public Streams readSpecific(@Nonnull final InstanceIdentifier<Streams> identifier) throws ReadFailedException {
+
+        // load data by this key
+        // *Key class will always contain key of entity, in this case long value
+
+        return new StreamsBuilder()
+                .setActiveStreams(new StreamNum(1L))
+                .build();
+    }
+
+    @Override
+    public List<Streams> readAll() throws ReadFailedException {
+        // read all data under parent node,in this case {@link ModuleState}
+        return Collections.singletonList(
+                readSpecific(InstanceIdentifier.create(StreamCountState.class).child(Streams.class)));
+    }
+}
diff --git a/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/Module.java b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/Module.java
new file mode 100644
index 00000000..05109db3
--- /dev/null
+++ b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/Module.java
@@ -0,0 +1,70 @@
+/*
+ * 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.
+ */
+
+/*
+ * Modifications copyright (c) 2019 AT&T Intellectual Property
+ */
+
+package io.fd.honeycomb.lcmapi;
+
+import static io.fd.honeycomb.lcmapi.ModuleConfiguration.ELEMENT_SERVICE_NAME;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.TypeLiteral;
+import com.google.inject.multibindings.Multibinder;
+import com.google.inject.name.Names;
+import io.fd.honeycomb.lcmapi.init.ConfigDataInitializer;
+import io.fd.honeycomb.lcmapi.write.ModuleWriterFactory;
+import io.fd.honeycomb.data.init.DataTreeInitializer;
+import io.fd.honeycomb.translate.write.WriterFactory;
+import net.jmob.guice.conf.core.ConfigurationModule;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.stream.count.params.Streams;
+
+/**
+ * Module class instantiating stream-count plugin components.
+ */
+public final class Module extends AbstractModule {
+
+    // TODO This initiates all the plugin components, but it still needs to be registered/wired into an integration
+    // module producing runnable distributions. There is one such distribution in honeycomb project:
+    // vpp-integration/minimal-distribution
+    // In order to integrate this plugin with the distribution:
+    // 1. Add a dependency on this maven module to the the distribution's pom.xml
+    // 2. Add an instance of this module into the distribution in its Main class
+
+    @Override
+    protected void configure() {
+        // requests injection of properties
+        install(ConfigurationModule.create());
+        requestInjection(ModuleConfiguration.class);
+
+        // creates binding for interface implementation by name
+        bind(new TypeLiteral<CrudService<Streams>>(){})
+                .annotatedWith(Names.named(ELEMENT_SERVICE_NAME))
+                .to(ElementCrudService.class);
+
+        // create writer factory binding
+        // can hold multiple binding for separate yang modules
+        final Multibinder<WriterFactory> writerFactoryBinder = Multibinder.newSetBinder(binder(), WriterFactory.class);
+        writerFactoryBinder.addBinding().to(ModuleWriterFactory.class);
+
+        // create initializer binding
+        // can hold multiple binding for separate yang modules
+        final Multibinder<DataTreeInitializer> initializerBinder =
+                Multibinder.newSetBinder(binder(), DataTreeInitializer.class);
+        initializerBinder.addBinding().to(ConfigDataInitializer.class);
+    }
+}
diff --git a/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/ModuleConfiguration.java b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/ModuleConfiguration.java
new file mode 100644
index 00000000..c574b3ef
--- /dev/null
+++ b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/ModuleConfiguration.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.lcmapi;
+
+import net.jmob.guice.conf.core.BindConfig;
+import net.jmob.guice.conf.core.InjectConfig;
+import net.jmob.guice.conf.core.Syntax;
+
+/**
+ * Class containing static configuration for stream-count module,<br>
+ * either loaded from property file stream-count.json from classpath.
+ * <p/>
+ * Further documentation for the configuration injection can be found at:
+ * https://github.com/yyvess/gconf
+ */
+@BindConfig(value = "stream-count", syntax = Syntax.JSON)
+public final class ModuleConfiguration {
+
+    // TODO change the sample property to real plugin configuration
+    // If there is no such configuration, remove this, stream-count.json resource and its wiring from Module class
+
+    /**
+     * Sample property that's injected from external json configuration file.
+     */
+    @InjectConfig("sample-prop")
+    public String sampleProp;
+
+    /**
+     * Constant name used to identify stream-count plugin specific components during dependency injection.
+     */
+    public static final String ELEMENT_SERVICE_NAME = "element-service";
+}
diff --git a/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/init/ConfigDataInitializer.java b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/init/ConfigDataInitializer.java
new file mode 100644
index 00000000..16edd1bc
--- /dev/null
+++ b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/init/ConfigDataInitializer.java
@@ -0,0 +1,54 @@
+/*
+ * 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.
+ */
+
+/*
+ * Modifications copyright (c) 2019 AT&T Intellectual Property
+ */
+
+package io.fd.honeycomb.lcmapi.init;
+
+import io.fd.honeycomb.data.init.AbstractDataTreeConverter;
+import com.google.inject.Inject;
+import com.google.inject.name.Named;
+import javax.annotation.Nonnull;
+import org.opendaylight.controller.md.sal.binding.api.DataBroker;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.StreamCount;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.StreamCountBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.StreamCountState;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Initialize configuration data based on operational data.
+ * <p/>
+ * Very useful when a plugin is initiated but the underlying layer already contains some operation state.
+ * Deriving the configuration from existing operational state enables reconciliation in case when Honeycomb's persistence
+ * is not available to do the work for us.
+ */
+public final class ConfigDataInitializer extends AbstractDataTreeConverter<StreamCountState, StreamCount> {
+
+    @Inject
+    public ConfigDataInitializer(@Named("honeycomb-initializer") @Nonnull final DataBroker bindingDataBroker) {
+        super(bindingDataBroker, InstanceIdentifier.create(StreamCountState.class), InstanceIdentifier.create(StreamCount.class));
+    }
+
+    @Override
+    public StreamCount convert(final StreamCountState operationalData) {
+        // Transfer all the operational data into configuration
+        return new StreamCountBuilder()
+                .setStreams(operationalData.getStreams())
+                .build();
+    }
+}
diff --git a/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/write/ElementCustomizer.java b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/write/ElementCustomizer.java
new file mode 100644
index 00000000..740ffdf7
--- /dev/null
+++ b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/write/ElementCustomizer.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.
+ */
+
+/*
+ * Modifications copyright (c) 2019 AT&T Intellectual Property
+ */
+
+package io.fd.honeycomb.lcmapi.write;
+
+import io.fd.honeycomb.lcmapi.CrudService;
+import io.fd.honeycomb.translate.spi.write.WriterCustomizer;
+import io.fd.honeycomb.translate.write.WriteContext;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+
+import java.io.IOException;
+
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.stream.count.params.Streams;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Writer for {@link Element} list node from our YANG model.
+ */
+
+public final class ElementCustomizer implements WriterCustomizer<Streams> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(ElementCustomizer.class);
+
+    private final CrudService<Streams> crudService;
+
+    public ElementCustomizer(@Nonnull final CrudService<Streams> crudService) {
+        this.crudService = crudService;
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Streams> id, @Nonnull final Streams dataAfter,
+                                       @Nonnull final WriteContext writeContext) throws WriteFailedException {
+        //perform write of data,or throw exception
+        //invoked by PUT operation,if provided data doesn't exist in Config data
+        crudService.writeData(id, dataAfter);
+        try {
+            runScript(dataAfter.getActiveStreams().getValue());
+        }
+        catch (IOException e) {
+            String message = "Write operation failed " + e;
+            LOG.error(message);
+        }
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<Streams> id,
+                                        @Nonnull final Streams dataBefore,
+                                        @Nonnull final Streams dataAfter, @Nonnull final WriteContext writeContext)
+            throws WriteFailedException {
+        //invoked by PUT operation,if provided data does exist in Config data
+        crudService.updateData(id, dataBefore, dataAfter);
+        try {
+            runScript(dataAfter.getActiveStreams().getValue());
+        }
+        catch (IOException e) {
+            String message = "Write operation failed " + e;
+            LOG.error(message);
+        }
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Streams> id,
+                                        @Nonnull final Streams dataBefore,
+                                        @Nonnull final WriteContext writeContext) throws WriteFailedException {
+        //perform delete of data,or throw exception
+        // Not supported, throw exception
+        throw new WriteFailedException.DeleteFailedException(id,
+                new UnsupportedOperationException("Delete operation not supported"));
+    }
+
+    //Update the number of running streams running a custom script that uses the old vPacketGen REST APIs
+    private void runScript(long streams) throws IOException {
+
+        String script = new String("bash /opt/update_running_streams.sh " + streams);
+        Runtime.getRuntime().exec(script);
+        String message = "Number of running streams updated to " + streams;
+        LOG.info(message);
+    }
+}
diff --git a/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/write/ModuleWriterFactory.java b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/write/ModuleWriterFactory.java
new file mode 100644
index 00000000..1de39761
--- /dev/null
+++ b/vnfs/honeycomb_plugin/stream-count/stream-count-impl/src/main/java/io/fd/honeycomb/lcmapi/write/ModuleWriterFactory.java
@@ -0,0 +1,57 @@
+/*
+ * 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.
+ */
+
+/*
+ * Modifications copyright (c) 2019 AT&T Intellectual Property
+ */
+
+package io.fd.honeycomb.lcmapi.write;
+
+import static io.fd.honeycomb.lcmapi.ModuleConfiguration.ELEMENT_SERVICE_NAME;
+
+import com.google.inject.Inject;
+import com.google.inject.name.Named;
+import io.fd.honeycomb.lcmapi.CrudService;
+import io.fd.honeycomb.translate.impl.write.GenericWriter;
+import io.fd.honeycomb.translate.write.WriterFactory;
+import io.fd.honeycomb.translate.write.registry.ModifiableWriterRegistryBuilder;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.StreamCount;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.stream.count.rev190118.stream.count.params.Streams;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Factory producing writers for stream-count plugin's data.
+ */
+public final class ModuleWriterFactory implements WriterFactory {
+
+    private static final InstanceIdentifier<StreamCount> ROOT_CONTAINER_ID = InstanceIdentifier.create(StreamCount.class);
+
+    /**
+     * Injected crud service to be passed to customizers instantiated in this factory.
+     */
+    @Inject
+    @Named(ELEMENT_SERVICE_NAME)
+    private CrudService<Streams> crudService;
+
+    @Override
+    public void init(@Nonnull final ModifiableWriterRegistryBuilder registry) {
+
+        //adds writer for child node
+        //no need to add writers for empty nodes
+        registry.add(new GenericWriter<>(ROOT_CONTAINER_ID.child(Streams.class), new ElementCustomizer(crudService)));
+    }
+}