opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/sal/dom/broker/ConsumerContextImpl.java

   1 /*
   2  * Copyright (c) 2014 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.sal.dom.broker;
   9
  10 import java.util.Collection;
  11 import java.util.concurrent.Future;
  12
  13 import javax.annotation.concurrent.GuardedBy;
  14
  15 import org.opendaylight.controller.sal.core.api.Broker.ConsumerSession;
  16 import org.opendaylight.controller.sal.core.api.BrokerService;
  17 import org.opendaylight.controller.sal.core.api.Consumer;
  18 import org.opendaylight.controller.sal.dom.broker.osgi.AbstractBrokerServiceProxy;
  19 import org.opendaylight.controller.sal.dom.broker.osgi.ProxyFactory;
  20 import org.opendaylight.yangtools.yang.common.QName;
  21 import org.opendaylight.yangtools.yang.common.RpcResult;
  22 import org.opendaylight.yangtools.yang.data.api.CompositeNode;
  23
  24 import com.google.common.base.Optional;
  25 import com.google.common.base.Preconditions;
  26 import com.google.common.collect.ClassToInstanceMap;
  27 import com.google.common.collect.MutableClassToInstanceMap;
  28
  29 class ConsumerContextImpl implements ConsumerSession {
  30
  31     private final ClassToInstanceMap<BrokerService> instantiatedServices = MutableClassToInstanceMap
  32             .create();
  33     private final Consumer consumer;
  34
  35     private BrokerImpl broker = null;
  36     @GuardedBy("this")
  37     private boolean closed = false;
  38
  39     public ConsumerContextImpl(final Consumer provider, final BrokerImpl brokerImpl) {
  40         broker = brokerImpl;
  41         consumer = provider;
  42     }
  43
  44     @Override
  45     public Future<RpcResult<CompositeNode>> rpc(final QName rpc,
  46             final CompositeNode input) {
  47         checkNotClosed();
  48         return broker.invokeRpcAsync(rpc, input);
  49     }
  50
  51     @Override
  52     public <T extends BrokerService> T getService(final Class<T> service) {
  53         checkNotClosed();
  54         final T localProxy = instantiatedServices.getInstance(service);
  55         if (localProxy != null) {
  56             return localProxy;
  57         }
  58         final Optional<T> serviceImpl = broker.getGlobalService(service);
  59         if(serviceImpl.isPresent()) {
  60             final T ret = ProxyFactory.createProxy(null,serviceImpl.get());
  61             instantiatedServices.putInstance(service, ret);
  62             return ret;
  63         } else {
  64             return null;
  65         }
  66     }
  67
  68     @Override
  69     public void close() {
  70         synchronized (this) {
  71             if (closed) {
  72                 return;
  73             }
  74             this.closed = true;
  75         }
  76
  77         Collection<BrokerService> toStop = instantiatedServices.values();
  78         for (BrokerService brokerService : toStop) {
  79             if (brokerService instanceof AbstractBrokerServiceProxy<?>) {
  80                 ((AbstractBrokerServiceProxy<?>) brokerService).close();
  81             }
  82         }
  83         broker.consumerSessionClosed(this);
  84         broker = null;
  85     }
  86
  87     @Override
  88     public synchronized boolean isClosed() {
  89         return closed;
  90     }
  91
  92     /**
  93      * @return the broker
  94      */
  95     protected final  BrokerImpl getBrokerChecked() {
  96         checkNotClosed();
  97         return broker;
  98     }
  99
 100     /**
 101      * @return the _consumer
 102      */
 103     public Consumer getConsumer() {
 104         return consumer;
 105     }
 106
 107     protected final void checkNotClosed()  {
 108         Preconditions.checkState(!closed, "Session is closed.");
 109     }
 110 }