2 * Copyright (c) 2017 Cisco Systems, Inc. and others. All rights reserved.
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
9 package org.opendaylight.controller.clustering.it.provider.impl;
11 import com.google.common.util.concurrent.Futures;
12 import com.google.common.util.concurrent.ListenableFuture;
13 import java.util.concurrent.atomic.AtomicBoolean;
14 import java.util.concurrent.atomic.AtomicLong;
15 import org.opendaylight.mdsal.singleton.common.api.ClusterSingletonService;
16 import org.opendaylight.mdsal.singleton.common.api.ClusterSingletonServiceProvider;
17 import org.opendaylight.mdsal.singleton.common.api.ClusterSingletonServiceRegistration;
18 import org.opendaylight.mdsal.singleton.common.api.ServiceGroupIdentifier;
19 import org.slf4j.Logger;
20 import org.slf4j.LoggerFactory;
22 public class FlappingSingletonService implements ClusterSingletonService {
24 private static final Logger LOG = LoggerFactory.getLogger(FlappingSingletonService.class);
26 private static final ServiceGroupIdentifier SERVICE_GROUP_IDENTIFIER =
27 ServiceGroupIdentifier.create("flapping-singleton-service");
29 private final ClusterSingletonServiceProvider singletonServiceProvider;
30 private final AtomicBoolean active = new AtomicBoolean(true);
32 private final AtomicLong flapCount = new AtomicLong();
33 private volatile ClusterSingletonServiceRegistration registration;
35 public FlappingSingletonService(final ClusterSingletonServiceProvider singletonServiceProvider) {
36 LOG.debug("Registering flapping-singleton-service.");
38 this.singletonServiceProvider = singletonServiceProvider;
39 registration = singletonServiceProvider.registerClusterSingletonService(this);
43 @SuppressWarnings("checkstyle:IllegalCatch")
44 public void instantiateServiceInstance() {
45 LOG.debug("Instantiating flapping-singleton-service.");
49 } catch (Exception e) {
50 LOG.warn("There was a problem closing flapping singleton service.", e);
53 final long count = flapCount.get();
54 flapCount.compareAndSet(count, -count);
59 @SuppressWarnings("checkstyle:IllegalCatch")
60 public ListenableFuture<Void> closeServiceInstance() {
61 LOG.debug("Closing flapping-singleton-service, flapCount: {}", flapCount);
63 flapCount.incrementAndGet();
65 LOG.debug("Running re-registration");
67 registration = singletonServiceProvider.registerClusterSingletonService(this);
68 } catch (RuntimeException e) {
69 LOG.warn("There was a problem re-registering flapping singleton service.", e);
72 final long count = flapCount.get();
73 flapCount.compareAndSet(count, -count - 1);
77 return Futures.immediateFuture(null);
81 public ServiceGroupIdentifier getIdentifier() {
82 return SERVICE_GROUP_IDENTIFIER;
85 public long setInactive() {
86 LOG.debug("Setting flapping-singleton-service to inactive, flap-count: {}", flapCount);
89 return flapCount.get();