bgp/rib-spi/src/main/java/org/opendaylight/protocol/bgp/rib/spi/AbstractRIBExtensionProviderActivator.java

   1 /*
   2  * Copyright (c) 2013 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.protocol.bgp.rib.spi;
   9
  10 import java.util.List;
  11
  12 import javax.annotation.concurrent.GuardedBy;
  13
  14 import org.slf4j.Logger;
  15 import org.slf4j.LoggerFactory;
  16
  17 import com.google.common.base.Preconditions;
  18
  19 public abstract class AbstractRIBExtensionProviderActivator implements RIBExtensionProviderActivator {
  20         private static final Logger LOG = LoggerFactory.getLogger(AbstractRIBExtensionProviderActivator.class);
  21
  22         @GuardedBy("this")
  23         private List<AutoCloseable> registrations;
  24
  25         @GuardedBy("this")
  26         protected abstract List<AutoCloseable> startRIBExtensionProviderImpl(RIBExtensionProviderContext context);
  27
  28         @Override
  29         public final synchronized void startRIBExtensionProvider(final RIBExtensionProviderContext context) {
  30                 Preconditions.checkState(this.registrations == null);
  31
  32                 this.registrations = Preconditions.checkNotNull(startRIBExtensionProviderImpl(context));
  33         }
  34
  35         @Override
  36         public final synchronized void stopRIBExtensionProvider() {
  37                 Preconditions.checkState(this.registrations != null);
  38
  39                 for (final AutoCloseable r : this.registrations) {
  40                         try {
  41                                 r.close();
  42                         } catch (final Exception e) {
  43                                 LOG.warn("Failed to close registration", e);
  44                         }
  45                 }
  46
  47                 this.registrations = null;
  48         }
  49 }