| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.google.code.gossip.manager; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map.Entry; |
| import java.util.concurrent.ConcurrentSkipListMap; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import javax.management.Notification; |
| import javax.management.NotificationListener; |
| |
| import org.apache.log4j.Logger; |
| |
| import com.google.code.gossip.GossipMember; |
| import com.google.code.gossip.GossipService; |
| import com.google.code.gossip.GossipSettings; |
| import com.google.code.gossip.LocalGossipMember; |
| import com.google.code.gossip.event.GossipListener; |
| import com.google.code.gossip.event.GossipState; |
| |
| public abstract class GossipManager extends Thread implements NotificationListener { |
| |
| public static final Logger LOGGER = Logger.getLogger(GossipManager.class); |
| public static final int MAX_PACKET_SIZE = 102400; |
| |
| private final ConcurrentSkipListMap<LocalGossipMember,GossipState> members; |
| private final LocalGossipMember _me; |
| private final GossipSettings _settings; |
| private final AtomicBoolean _gossipServiceRunning; |
| private final Class<? extends PassiveGossipThread> _passiveGossipThreadClass; |
| private final Class<? extends ActiveGossipThread> _activeGossipThreadClass; |
| private final GossipListener listener; |
| private ActiveGossipThread activeGossipThread; |
| private PassiveGossipThread passiveGossipThread; |
| private ExecutorService _gossipThreadExecutor; |
| |
| public GossipManager(Class<? extends PassiveGossipThread> passiveGossipThreadClass, |
| Class<? extends ActiveGossipThread> activeGossipThreadClass, String cluster, String address, int port, |
| String id, GossipSettings settings, List<GossipMember> gossipMembers, |
| GossipListener listener) { |
| _passiveGossipThreadClass = passiveGossipThreadClass; |
| _activeGossipThreadClass = activeGossipThreadClass; |
| _settings = settings; |
| _me = new LocalGossipMember(cluster, address, port, id, System.currentTimeMillis(), this, settings.getCleanupInterval()); |
| members = new ConcurrentSkipListMap<>(); |
| for (GossipMember startupMember : gossipMembers) { |
| if (!startupMember.equals(_me)) { |
| LocalGossipMember member = new LocalGossipMember(startupMember.getClusterName(), startupMember.getHost(), |
| startupMember.getPort(), startupMember.getId(), System.currentTimeMillis(), this, |
| settings.getCleanupInterval()); |
| members.put(member, GossipState.UP); |
| GossipService.LOGGER.debug(member); |
| } |
| } |
| _gossipThreadExecutor = Executors.newCachedThreadPool(); |
| _gossipServiceRunning = new AtomicBoolean(true); |
| this.listener = listener; |
| Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() { |
| public void run() { |
| GossipService.LOGGER.debug("Service has been shutdown..."); |
| } |
| })); |
| } |
| |
| /** |
| * All timers associated with a member will trigger this method when it goes off. The timer will |
| * go off if we have not heard from this member in <code> _settings.T_CLEANUP </code> time. |
| */ |
| @Override |
| public void handleNotification(Notification notification, Object handback) { |
| LocalGossipMember deadMember = (LocalGossipMember) notification.getUserData(); |
| GossipService.LOGGER.debug("Dead member detected: " + deadMember); |
| members.put(deadMember, GossipState.DOWN); |
| if (listener != null) { |
| listener.gossipEvent(deadMember, GossipState.DOWN); |
| } |
| } |
| |
| public void revivieMember(LocalGossipMember m){ |
| for ( Entry<LocalGossipMember, GossipState> it : this.members.entrySet()){ |
| if (it.getKey().getId().equals(m.getId())){ |
| it.getKey().disableTimer(); |
| } |
| } |
| members.remove(m); |
| members.put(m, GossipState.UP); |
| if (listener != null) { |
| listener.gossipEvent(m, GossipState.UP); |
| } |
| } |
| |
| public void createOrRevivieMember(LocalGossipMember m){ |
| members.put(m, GossipState.UP); |
| if (listener != null) { |
| listener.gossipEvent(m, GossipState.UP); |
| } |
| } |
| |
| public GossipSettings getSettings() { |
| return _settings; |
| } |
| |
| /** |
| * |
| * @return a read only list of members found in the UP state |
| */ |
| public List<LocalGossipMember> getMemberList() { |
| List<LocalGossipMember> up = new ArrayList<>(); |
| for (Entry<LocalGossipMember, GossipState> entry : members.entrySet()){ |
| if (GossipState.UP.equals(entry.getValue())){ |
| up.add(entry.getKey()); |
| } |
| } |
| return Collections.unmodifiableList(up); |
| } |
| |
| public LocalGossipMember getMyself() { |
| return _me; |
| } |
| |
| public List<LocalGossipMember> getDeadList() { |
| List<LocalGossipMember> up = new ArrayList<>(); |
| for (Entry<LocalGossipMember, GossipState> entry : members.entrySet()){ |
| if (GossipState.DOWN.equals(entry.getValue())){ |
| up.add(entry.getKey()); |
| } |
| } |
| return Collections.unmodifiableList(up); |
| } |
| |
| /** |
| * Starts the client. Specifically, start the various cycles for this protocol. Start the gossip |
| * thread and start the receiver thread. |
| */ |
| public void run() { |
| for (LocalGossipMember member : members.keySet()) { |
| if (member != _me) { |
| member.startTimeoutTimer(); |
| } |
| } |
| try { |
| passiveGossipThread = _passiveGossipThreadClass.getConstructor(GossipManager.class) |
| .newInstance(this); |
| _gossipThreadExecutor.execute(passiveGossipThread); |
| activeGossipThread = _activeGossipThreadClass.getConstructor(GossipManager.class) |
| .newInstance(this); |
| _gossipThreadExecutor.execute(activeGossipThread); |
| } catch (InstantiationException | IllegalAccessException | IllegalArgumentException |
| | InvocationTargetException | NoSuchMethodException | SecurityException e1) { |
| throw new RuntimeException(e1); |
| } |
| GossipService.LOGGER.debug("The GossipService is started."); |
| while (_gossipServiceRunning.get()) { |
| try { |
| // TODO |
| TimeUnit.MILLISECONDS.sleep(1); |
| } catch (InterruptedException e) { |
| GossipService.LOGGER.warn("The GossipClient was interrupted."); |
| } |
| } |
| } |
| |
| /** |
| * Shutdown the gossip service. |
| */ |
| public void shutdown() { |
| _gossipServiceRunning.set(false); |
| _gossipThreadExecutor.shutdown(); |
| passiveGossipThread.shutdown(); |
| activeGossipThread.shutdown(); |
| try { |
| boolean result = _gossipThreadExecutor.awaitTermination(1000, TimeUnit.MILLISECONDS); |
| if (!result){ |
| LOGGER.error("executor shutdown timed out"); |
| } |
| } catch (InterruptedException e) { |
| LOGGER.error(e); |
| } |
| } |
| } |