opendaylight/md-sal/samples/clustering-test-app/provider/src/main/java/org/opendaylight/controller/clustering/it/provider/impl/SingletonGetConstantService.java

   1 /*
   2  * Copyright (c) 2017 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.clustering.it.provider.impl;
   9
  10 import com.google.common.util.concurrent.Futures;
  11 import com.google.common.util.concurrent.ListenableFuture;
  12 import org.opendaylight.mdsal.dom.api.DOMRpcIdentifier;
  13 import org.opendaylight.mdsal.dom.api.DOMRpcImplementation;
  14 import org.opendaylight.mdsal.dom.api.DOMRpcProviderService;
  15 import org.opendaylight.mdsal.dom.api.DOMRpcResult;
  16 import org.opendaylight.mdsal.dom.spi.DefaultDOMRpcResult;
  17 import org.opendaylight.mdsal.singleton.api.ClusterSingletonService;
  18 import org.opendaylight.mdsal.singleton.api.ClusterSingletonServiceProvider;
  19 import org.opendaylight.mdsal.singleton.api.ServiceGroupIdentifier;
  20 import org.opendaylight.yangtools.concepts.Registration;
  21 import org.opendaylight.yangtools.yang.common.QName;
  22 import org.opendaylight.yangtools.yang.common.QNameModule;
  23 import org.opendaylight.yangtools.yang.common.YangConstants;
  24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  25 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  26 import org.opendaylight.yangtools.yang.data.spi.node.ImmutableNodes;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 public final class SingletonGetConstantService implements DOMRpcImplementation, ClusterSingletonService {
  31     private static final Logger LOG = LoggerFactory.getLogger(SingletonGetConstantService.class);
  32
  33     private static final QNameModule MODULE =
  34         QNameModule.ofRevision("tag:opendaylight.org,2017:controller:yang:lowlevel:target", "2017-02-15").intern();
  35     private static final QName OUTPUT = YangConstants.operationOutputQName(MODULE).intern();
  36     private static final QName CONSTANT = QName.create(MODULE, "constant").intern();
  37     private static final QName CONTEXT = QName.create(MODULE, "context").intern();
  38     private static final QName GET_SINGLETON_CONSTANT = QName.create(MODULE, "get-singleton-constant").intern();
  39
  40     private static final ServiceGroupIdentifier SERVICE_GROUP_IDENTIFIER =
  41         new ServiceGroupIdentifier("get-singleton-constant-service");
  42
  43     private final DOMRpcProviderService rpcProviderService;
  44     private final String constant;
  45
  46     private Registration rpcRegistration = null;
  47
  48     private SingletonGetConstantService(final DOMRpcProviderService rpcProviderService, final String constant) {
  49         this.rpcProviderService = rpcProviderService;
  50         this.constant = constant;
  51     }
  52
  53     public static Registration registerNew(final ClusterSingletonServiceProvider singletonService,
  54             final DOMRpcProviderService rpcProviderService, final String constant) {
  55         LOG.debug("Registering get-singleton-constant into ClusterSingletonService, value {}", constant);
  56
  57         return singletonService.registerClusterSingletonService(
  58             new SingletonGetConstantService(rpcProviderService, constant));
  59     }
  60
  61     @Override
  62     public ListenableFuture<DOMRpcResult> invokeRpc(final DOMRpcIdentifier rpc, final ContainerNode input) {
  63         LOG.debug("get-singleton-constant invoked, current value: {}", constant);
  64
  65         return Futures.immediateFuture(new DefaultDOMRpcResult(ImmutableNodes.newContainerBuilder()
  66             .withNodeIdentifier(new NodeIdentifier(OUTPUT))
  67             .withChild(ImmutableNodes.leafNode(CONSTANT, constant))
  68             .build()));
  69     }
  70
  71     @Override
  72     public void instantiateServiceInstance() {
  73         LOG.debug("Gained ownership of get-singleton-constant, registering service into rpcService");
  74         final DOMRpcIdentifier id = DOMRpcIdentifier.create(GET_SINGLETON_CONSTANT);
  75
  76         rpcRegistration = rpcProviderService.registerRpcImplementation(this, id);
  77     }
  78
  79     @Override
  80     public ListenableFuture<Void> closeServiceInstance() {
  81         LOG.debug("Closing get-singleton-constant instance");
  82         rpcRegistration.close();
  83         return Futures.immediateFuture(null);
  84     }
  85
  86     @Override
  87     public ServiceGroupIdentifier getIdentifier() {
  88         return SERVICE_GROUP_IDENTIFIER;
  89     }
  90 }