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