HONEYCOMB-130: Separate v3po plugin from HC infra

Creating folders:
- common/
- infra/
- v3po/
- vpp-common/

Change-Id: I2c39e1b17e39e7c0f0628f44aa5fe08563fa06e4
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>

11 files changed, 663 insertions, 0 deletions

diff --git a/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/AbstractDataTreeConverter.java b/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/AbstractDataTreeConverter.java
new file mode 100644
index 000000000..f0058264e
--- /dev/null
+++ b/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/AbstractDataTreeConverter.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.data.init;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Optional;
+import com.google.common.util.concurrent.CheckedFuture;
+import org.opendaylight.controller.md.sal.binding.api.DataBroker;
+import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
+import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
+import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
+import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Base class for initializers which perform conversion between operational and config YANG model.
+ *
+ * @param <C> Config data object
+ * @param <O> Operational data object
+ */
+@Beta
+public abstract class AbstractDataTreeConverter<O extends DataObject, C extends DataObject>
+        implements DataTreeInitializer {
+    private static final Logger LOG = LoggerFactory.getLogger(AbstractDataTreeConverter.class);
+
+    private final InstanceIdentifier<O> idOper;
+    private final InstanceIdentifier<C> idConfig;
+    private final DataBroker bindingDataBroker;
+
+    public AbstractDataTreeConverter(final DataBroker bindingDataBroker,
+                                     final InstanceIdentifier<O> operRootId,
+                                     final InstanceIdentifier<C> cfgRootId) {
+        this.bindingDataBroker = checkNotNull(bindingDataBroker, "bindingDataBroker should not be null");
+        this.idOper = checkNotNull(operRootId, "operRootId should not be null");
+        this.idConfig = checkNotNull(cfgRootId, "cfgRootId should not be null");
+    }
+
+    @Override
+    public void close() throws Exception {
+        LOG.debug("AbstractDataTreeConverter.close()");
+        // Not removing initialized data, since this works in cooperation with persistence, it could remove
+        // data restored by persistence or remove user configured data when shutting down HC
+    }
+
+    @Override
+    public final void initialize() throws InitializeException {
+        LOG.debug("AbstractDataTreeConverter.initialize() from(oper): {}, to(cfg): {}", idOper, idConfig);
+        final Optional<O> data = readData();
+
+        if (data.isPresent()) {
+            LOG.debug("Config initialization, operational data={}", data);
+
+            final O operationalData = data.get();
+            final C configData = convert(operationalData);
+
+            try {
+                LOG.debug("Initializing config with data={}", configData);
+                writeData(configData);
+                LOG.info("Config initialization successful from(oper): {}, to(cfg): {}", idOper, idConfig);
+            } catch (TransactionCommitFailedException e) {
+                throw new InitializeException("Failed to perform config initialization", e);
+            }
+        } else {
+            LOG.info("Data is not present under: {}, no initial changes to config at: {}", idOper, idConfig);
+        }
+    }
+
+    private Optional<O> readData() {
+        try (ReadOnlyTransaction readTx = bindingDataBroker.newReadOnlyTransaction()) {
+            final CheckedFuture<Optional<O>, org.opendaylight.controller.md.sal.common.api.data.ReadFailedException>
+                    readFuture = readTx.read(LogicalDatastoreType.OPERATIONAL, idOper);
+            return readFuture.checkedGet();
+        } catch (org.opendaylight.controller.md.sal.common.api.data.ReadFailedException e) {
+            LOG.warn("Failed to read operational state", e);
+        }
+        return Optional.absent();
+    }
+
+    private void writeData(final C configData) throws TransactionCommitFailedException {
+        final WriteTransaction writeTx = bindingDataBroker.newWriteOnlyTransaction();
+        // Merge(instead of put) has to be used due to dynamic start, this might be executed multiple times
+        // and might overwrite config restored from persisted file with the same incomplete config.
+        // Making the entire configuration trigger VPP twice (on second persis ... and VPP does not like that
+        writeTx.merge(LogicalDatastoreType.CONFIGURATION, idConfig, configData);
+        writeTx.submit().checkedGet();
+    }
+
+    // TODO make this class concrete and use function dependency instead of abstract method
+    /**
+     * Converts operational data to config data for given root node
+     * @param operationalData data object representing operational data
+     * @return data object representing config data
+     */
+    protected abstract C convert(final O operationalData);
+}
diff --git a/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/DataTreeInitializer.java b/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/DataTreeInitializer.java
new file mode 100644
index 000000000..d760401f9
--- /dev/null
+++ b/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/DataTreeInitializer.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.data.init;
+
+import com.google.common.annotations.Beta;
+
+/**
+ * Service for config data tree initialization.
+ * Implementation reads operational data and initializes config data tree.
+ * Initialization does not cause any change in VPP state, unlike ordinary writes to config.
+ */
+@Beta
+public interface DataTreeInitializer extends AutoCloseable {
+
+    /**
+     * Initializes config data tree for supported root node.
+     * @throws InitializeException if initialization failed
+     */
+    void initialize() throws InitializeException;
+
+    /**
+     * Removes all data managed by the initializer.
+     */
+    @Override
+    void close() throws Exception;
+
+    class InitializeException extends Exception {
+
+        public InitializeException(final String message, final Throwable cause) {
+            super(message, cause);
+        }
+
+        public InitializeException(final String msg) {
+            super(msg);
+        }
+    }
+}
diff --git a/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/InitializerRegistry.java b/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/InitializerRegistry.java
new file mode 100644
index 000000000..8760f0f09
--- /dev/null
+++ b/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/InitializerRegistry.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.v3po.vpp.data.init;
+
+import com.google.common.annotations.Beta;
+
+/**
+ * Data tree initializer suitable as a holder for all other root initializers, providing initializeAll feature.
+ */
+@Beta
+public interface InitializerRegistry extends DataTreeInitializer {
+
+    /**
+     * Performs initialize on all registered root initializers.
+     * @throws if initialization failed
+     */
+    @Override
+    void initialize() throws InitializeException;
+}
diff --git a/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/InitializerRegistryImpl.java b/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/InitializerRegistryImpl.java
new file mode 100644
index 000000000..e5220f7e8
--- /dev/null
+++ b/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/InitializerRegistryImpl.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.data.init;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class InitializerRegistryImpl implements InitializerRegistry {
+    private static final Logger LOG = LoggerFactory.getLogger(InitializerRegistryImpl.class);
+    private final List<DataTreeInitializer> initializers;
+
+    public InitializerRegistryImpl(@Nonnull List<DataTreeInitializer> initializers) {
+        this.initializers = checkNotNull(initializers, "initializers should not be null");
+        checkArgument(!initializers.contains(null), "initializers should not contain null elements");
+    }
+
+    @Override
+    public void close() throws Exception {
+        LOG.debug("InitializerRegistryImpl.close()");
+        for (DataTreeInitializer initializer : initializers) {
+            initializer.close();
+        }
+    }
+
+    @Override
+    public void initialize() throws InitializeException {
+        // TODO check if readers are there
+        LOG.debug("InitializerRegistryImpl.initialize()");
+        for (DataTreeInitializer initializer : initializers) {
+            initializer.initialize();
+        }
+    }
+}
diff --git a/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/RestoringInitializer.java b/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/RestoringInitializer.java
new file mode 100644
index 000000000..abc3f54c0
--- /dev/null
+++ b/infra/cfg-init/src/main/java/io/fd/honeycomb/v3po/vpp/data/init/RestoringInitializer.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.data.init;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import io.fd.honeycomb.v3po.translate.util.JsonUtils;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+import javax.annotation.Nonnull;
+import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
+import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataBroker;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
+import org.opendaylight.controller.sal.core.api.model.SchemaService;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407.RestorationType;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
+import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class RestoringInitializer implements DataTreeInitializer {
+
+    private static final Logger LOG = LoggerFactory.getLogger(RestoringInitializer.class);
+
+    private final SchemaService schemaService;
+    private final Path path;
+    private final DOMDataBroker dataTree;
+    private final RestorationType restorationType;
+    private final LogicalDatastoreType datastoreType;
+
+    public RestoringInitializer(@Nonnull final SchemaService schemaService,
+                                @Nonnull final Path path,
+                                @Nonnull final DOMDataBroker dataTree,
+                                @Nonnull final RestorationType restorationType,
+                                @Nonnull final LogicalDatastoreType datastoreType) {
+        this.schemaService = schemaService;
+        this.datastoreType = datastoreType;
+        this.path = checkStorage(path);
+        this.dataTree = dataTree;
+        this.restorationType = restorationType;
+    }
+
+    private Path checkStorage(final Path path) {
+        if (Files.exists(path)) {
+            checkArgument(!Files.isDirectory(path), "File %s is a directory", path);
+            checkArgument(Files.isReadable(path), "File %s is not readable", path);
+        }
+
+        return path;
+    }
+
+    @Override
+    public void initialize() throws InitializeException {
+        LOG.debug("Starting restoration of {} from {} using {}", dataTree, path, restorationType);
+        if(!Files.exists(path)) {
+            LOG.debug("Persist file {} does not exist. Skipping restoration", path);
+            return;
+        }
+
+        try {
+            final ContainerNode containerNode = JsonUtils
+                .readJsonRoot(schemaService.getGlobalContext(), Files.newInputStream(path, StandardOpenOption.READ));
+
+            final DOMDataWriteTransaction domDataWriteTransaction = dataTree.newWriteOnlyTransaction();
+            for (DataContainerChild<? extends YangInstanceIdentifier.PathArgument, ?> dataContainerChild : containerNode
+                .getValue()) {
+                final YangInstanceIdentifier iid = YangInstanceIdentifier.create(dataContainerChild.getIdentifier());
+                LOG.trace("Restoring {} from {}", iid, path);
+
+                switch (restorationType) {
+                    case Merge:
+                        domDataWriteTransaction.merge(datastoreType, iid, dataContainerChild);
+                        break;
+                    case Put:
+                        domDataWriteTransaction.put(datastoreType, iid, dataContainerChild);
+                        break;
+                    default:
+                        throw new InitializeException(
+                            "Unable to initialize data using " + restorationType + " restoration strategy. Unsupported");
+                }
+            }
+
+            // Block here to prevent subsequent initializers processing before context is fully restored
+            domDataWriteTransaction.submit().checkedGet();
+            LOG.debug("Data from {} restored successfully", path);
+
+        } catch (IOException | TransactionCommitFailedException e) {
+            throw new InitializeException("Unable to restore data from " + path, e);
+        }
+    }
+
+    @Override
+    public void close() {}
+}
diff --git a/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/ConfigurationInitializerRegistryModule.java b/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/ConfigurationInitializerRegistryModule.java
new file mode 100644
index 000000000..3fff82e32
--- /dev/null
+++ b/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/ConfigurationInitializerRegistryModule.java
@@ -0,0 +1,54 @@
+package org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407;
+
+import io.fd.honeycomb.v3po.vpp.data.init.InitializerRegistry;
+import io.fd.honeycomb.v3po.vpp.data.init.InitializerRegistryImpl;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+* Initializer registry, delegating initialization to a list of initializers
+*/
+public class ConfigurationInitializerRegistryModule extends org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407.AbstractConfigurationInitializerRegistryModule {
+
+    private static final Logger LOG = LoggerFactory.getLogger(ConfigurationInitializerRegistryModule.class);
+
+    public ConfigurationInitializerRegistryModule(org.opendaylight.controller.config.api.ModuleIdentifier identifier, org.opendaylight.controller.config.api.DependencyResolver dependencyResolver) {
+        super(identifier, dependencyResolver);
+    }
+
+    public ConfigurationInitializerRegistryModule(org.opendaylight.controller.config.api.ModuleIdentifier identifier, org.opendaylight.controller.config.api.DependencyResolver dependencyResolver, org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407.ConfigurationInitializerRegistryModule oldModule, java.lang.AutoCloseable oldInstance) {
+        super(identifier, dependencyResolver, oldModule, oldInstance);
+    }
+
+    @Override
+    public void customValidation() {
+        // add custom validation form module attributes here.
+    }
+
+    @Override
+    public java.lang.AutoCloseable createInstance() {
+        LOG.info("VppConfigurationInitializerModule.createInstance(): initialization started");
+
+        final InitializerRegistry initializer = new InitializerRegistryImpl(getInitializersDependency());
+
+        try {
+            // Initialize contexts first so that other initializers can find any relevant mapping before initializing
+            // configuration to what is already in VPP
+            getPersistedContextInitializerDependency().initialize();
+            LOG.info("Persisted context restored successfully");
+            // Initialize all registered initializers
+            initializer.initialize();
+            LOG.info("VPP configuration initialized successfully from VPP");
+            // Initialize stored configuration on top
+            getPersistedConfigInitializerDependency().initialize();
+            LOG.info("Persisted configuration restored successfully");
+        } catch (Exception e) {
+            LOG.warn("Failed to initialize config", e);
+        }
+
+        LOG.info("Honeycomb initialized");
+
+        return initializer;
+    }
+
+}
diff --git a/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/ConfigurationInitializerRegistryModuleFactory.java b/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/ConfigurationInitializerRegistryModuleFactory.java
new file mode 100644
index 000000000..f07be953e
--- /dev/null
+++ b/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/ConfigurationInitializerRegistryModuleFactory.java
@@ -0,0 +1,13 @@
+/*
+* Generated file
+*
+* Generated from: yang module name: vpp-cfg-init yang module local name: cfg-initializer-registry
+* Generated by: org.opendaylight.controller.config.yangjmxgenerator.plugin.JMXGenerator
+* Generated at: Wed May 18 14:43:49 CEST 2016
+*
+* Do not modify this file unless it is present under src/main directory
+*/
+package org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407;
+public class ConfigurationInitializerRegistryModuleFactory extends org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407.AbstractConfigurationInitializerRegistryModuleFactory {
+
+}
diff --git a/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/PersistedFileInitializerModule.java b/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/PersistedFileInitializerModule.java
new file mode 100644
index 000000000..188d1641c
--- /dev/null
+++ b/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/PersistedFileInitializerModule.java
@@ -0,0 +1,38 @@
+package org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407;
+
+import io.fd.honeycomb.v3po.vpp.data.init.RestoringInitializer;
+import java.nio.file.InvalidPathException;
+import java.nio.file.Paths;
+import org.opendaylight.controller.config.api.JmxAttributeValidationException;
+import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.data.api.rev160411.DatatreeType;
+
+/**
+* Initializer restoring data from a persisted file
+*/
+public class PersistedFileInitializerModule extends org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407.AbstractPersistedFileInitializerModule {
+    public PersistedFileInitializerModule(org.opendaylight.controller.config.api.ModuleIdentifier identifier, org.opendaylight.controller.config.api.DependencyResolver dependencyResolver) {
+        super(identifier, dependencyResolver);
+    }
+
+    public PersistedFileInitializerModule(org.opendaylight.controller.config.api.ModuleIdentifier identifier, org.opendaylight.controller.config.api.DependencyResolver dependencyResolver, org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407.PersistedFileInitializerModule oldModule, java.lang.AutoCloseable oldInstance) {
+        super(identifier, dependencyResolver, oldModule, oldInstance);
+    }
+
+    @Override
+    public void customValidation() {
+        try {
+            Paths.get(getPersistFilePath());
+        } catch (InvalidPathException e) {
+            throw new JmxAttributeValidationException("Invalid persist path", e, persistFilePathJmxAttribute);
+        }
+    }
+
+    @Override
+    public java.lang.AutoCloseable createInstance() {
+        return new RestoringInitializer(getSchemaServiceDependency(), Paths.get(getPersistFilePath()),
+            getDomDataBrokerDependency(), getRestorationType(),
+            getDatastoreType() == DatatreeType.Config ? LogicalDatastoreType.CONFIGURATION : LogicalDatastoreType.OPERATIONAL);
+    }
+
+}
diff --git a/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/PersistedFileInitializerModuleFactory.java b/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/PersistedFileInitializerModuleFactory.java
new file mode 100644
index 000000000..1d7a3c9c6
--- /dev/null
+++ b/infra/cfg-init/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/vpp/data/init/rev160407/PersistedFileInitializerModuleFactory.java
@@ -0,0 +1,13 @@
+/*
+* Generated file
+*
+* Generated from: yang module name: vpp-cfg-init yang module local name: persisted-file-initializer
+* Generated by: org.opendaylight.controller.config.yangjmxgenerator.plugin.JMXGenerator
+* Generated at: Wed May 18 13:48:52 CEST 2016
+*
+* Do not modify this file unless it is present under src/main directory
+*/
+package org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407;
+public class PersistedFileInitializerModuleFactory extends org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.vpp.data.init.rev160407.AbstractPersistedFileInitializerModuleFactory {
+
+}
diff --git a/infra/cfg-init/src/main/yang/vpp-cfg-init.yang b/infra/cfg-init/src/main/yang/vpp-cfg-init.yang
new file mode 100644
index 000000000..52750d926
--- /dev/null
+++ b/infra/cfg-init/src/main/yang/vpp-cfg-init.yang
@@ -0,0 +1,117 @@
+module vpp-cfg-init {
+    yang-version 1;
+    namespace "urn:honeycomb:params:xml:ns:yang:vpp:data:init";
+    prefix "init";
+
+    import config { prefix config; revision-date 2013-04-05; }
+    import opendaylight-md-sal-dom {prefix dom;}
+    import translate-api { prefix tapi; revision-date 2016-04-06; }
+    import data-api { prefix dapi; revision-date 2016-04-11; }
+
+    description
+        "This module contains initializers for VPP config data tree";
+
+    revision "2016-04-07" {
+        description
+            "Initial revision";
+    }
+
+    identity cfg-initializer {
+        base "config:service-type";
+        config:java-class io.fd.honeycomb.v3po.vpp.data.init.DataTreeInitializer;
+    }
+
+    identity cfg-initializer-registry {
+        base config:module-type;
+        config:provided-service cfg-initializer;
+        config:java-name-prefix ConfigurationInitializerRegistry;
+        description "Initializer registry, delegating initialization to a list of initializers";
+    }
+
+    augment "/config:modules/config:module/config:configuration" {
+        case cfg-initializer-registry {
+            when "/config:modules/config:module/config:type = 'cfg-initializer-registry'";
+
+             list initializers {
+                uses config:service-ref {
+                    refine type {
+                        mandatory true;
+                        config:required-identity cfg-initializer;
+                    }
+                }
+             }
+
+             container persisted-context-initializer {
+                uses config:service-ref {
+                    refine type {
+                        mandatory true;
+                        config:required-identity cfg-initializer;
+                    }
+                }
+             }
+
+             container persisted-config-initializer {
+                uses config:service-ref {
+                    refine type {
+                        mandatory true;
+                        config:required-identity cfg-initializer;
+                    }
+                }
+             }
+        }
+    }
+
+    identity persisted-file-initializer {
+        base config:module-type;
+        config:provided-service cfg-initializer;
+        description "Initializer restoring data from a persisted file";
+    }
+
+    typedef restoration-type {
+        type enumeration {
+             enum merge;
+             enum put;
+         }
+    }
+
+    augment "/config:modules/config:module/config:configuration" {
+        case persisted-file-initializer {
+            when "/config:modules/config:module/config:type = 'persisted-file-initializer'";
+
+            container dom-data-broker {
+                uses config:service-ref {
+                    refine type {
+                        mandatory true;
+                        config:required-identity dom:dom-async-data-broker;
+                    }
+                }
+            }
+
+            container schema-service {
+                uses config:service-ref {
+                    refine type {
+                        mandatory true;
+                        config:required-identity dom:schema-service;
+                    }
+                }
+            }
+
+            leaf persist-file-path {
+                type string;
+                mandatory true;
+            }
+
+            leaf restoration-type {
+                type restoration-type;
+                default merge;
+            }
+
+
+            leaf datastore-type {
+                type dapi:datatree-type;
+                mandatory true;
+            }
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/infra/cfg-init/src/test/java/io/fd/honeycomb/v3po/vpp/data/init/InitializerRegistryImplTest.java b/infra/cfg-init/src/test/java/io/fd/honeycomb/v3po/vpp/data/init/InitializerRegistryImplTest.java
new file mode 100644
index 000000000..d562fb60c
--- /dev/null
+++ b/infra/cfg-init/src/test/java/io/fd/honeycomb/v3po/vpp/data/init/InitializerRegistryImplTest.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.vpp.data.init;
+
+import static org.mockito.Mockito.verify;
+import static org.mockito.MockitoAnnotations.initMocks;
+
+import java.util.Arrays;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mock;
+
+public class InitializerRegistryImplTest {
+
+    @Mock(name="dti1")
+    private DataTreeInitializer dti1;
+    @Mock(name="dti2")
+    private DataTreeInitializer dti2;
+    @Mock(name="dti3")
+    private DataTreeInitializer dti3;
+
+    private InitializerRegistryImpl initializerRegistry;
+
+    @Before
+    public void setUp() throws Exception {
+        initMocks(this);
+        initializerRegistry = new InitializerRegistryImpl(Arrays.asList(dti1, dti2, dti3));
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void testConstructorFailed() throws Exception {
+        new InitializerRegistryImpl(Arrays.asList(dti1, null));
+    }
+
+    @Test
+    public void testInitialize() throws Exception {
+        initializerRegistry.initialize();
+
+        verify(dti1).initialize();
+        verify(dti2).initialize();
+        verify(dti3).initialize();
+    }
+
+    @Test
+    public void testClose() throws Exception {
+        initializerRegistry.close();
+
+        verify(dti1).close();
+        verify(dti2).close();
+        verify(dti3).close();
+    }
+}
\ No newline at end of file