pcep/spi/src/main/java/org/opendaylight/protocol/pcep/spi/pojo/AbstractPCEPExtensionProviderActivator.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.pcep.spi.pojo;
   9
  10 import java.util.List;
  11
  12 import javax.annotation.concurrent.GuardedBy;
  13
  14 import org.opendaylight.protocol.pcep.spi.PCEPExtensionProviderActivator;
  15 import org.opendaylight.protocol.pcep.spi.PCEPExtensionProviderContext;
  16 import org.slf4j.Logger;
  17 import org.slf4j.LoggerFactory;
  18
  19 import com.google.common.base.Preconditions;
  20
  21 public abstract class AbstractPCEPExtensionProviderActivator implements PCEPExtensionProviderActivator {
  22         private static final Logger LOG = LoggerFactory.getLogger(AbstractPCEPExtensionProviderActivator.class);
  23
  24         @GuardedBy("this")
  25         private List<AutoCloseable> registrations;
  26
  27         @GuardedBy("this")
  28         protected abstract List<AutoCloseable> startImpl(PCEPExtensionProviderContext context);
  29
  30         @Override
  31         public final synchronized void start(final PCEPExtensionProviderContext context) {
  32                 Preconditions.checkState(this.registrations == null);
  33
  34                 this.registrations = Preconditions.checkNotNull(startImpl(context));
  35         }
  36
  37         @Override
  38         public final synchronized void stop() {
  39                 Preconditions.checkState(this.registrations != null);
  40
  41                 for (final AutoCloseable r : this.registrations) {
  42                         try {
  43                                 r.close();
  44                         } catch (final Exception e) {
  45                                 LOG.warn("Failed to close registration", e);
  46                         }
  47                 }
  48
  49                 this.registrations = null;
  50         }
  51 }