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265
java/org/apache/catalina/ha/session/BackupManager.java
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265
java/org/apache/catalina/ha/session/BackupManager.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.catalina.ha.session;
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import java.util.HashSet;
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import java.util.Set;
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import org.apache.catalina.DistributedManager;
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import org.apache.catalina.LifecycleException;
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import org.apache.catalina.LifecycleState;
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import org.apache.catalina.Session;
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import org.apache.catalina.ha.ClusterManager;
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import org.apache.catalina.ha.ClusterMessage;
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import org.apache.catalina.tribes.Channel;
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import org.apache.catalina.tribes.tipis.AbstractReplicatedMap.MapOwner;
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import org.apache.catalina.tribes.tipis.LazyReplicatedMap;
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import org.apache.juli.logging.Log;
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import org.apache.juli.logging.LogFactory;
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import org.apache.tomcat.util.res.StringManager;
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/**
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*@version 1.0
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*/
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public class BackupManager extends ClusterManagerBase
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implements MapOwner, DistributedManager {
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private final Log log = LogFactory.getLog(BackupManager.class); // must not be static
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/**
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* The string manager for this package.
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*/
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protected static final StringManager sm = StringManager.getManager(BackupManager.class);
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protected static final long DEFAULT_REPL_TIMEOUT = 15000;//15 seconds
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/**
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* The name of this manager
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*/
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protected String name;
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/**
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* Flag for how this map sends messages.
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*/
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private int mapSendOptions = Channel.SEND_OPTIONS_SYNCHRONIZED_ACK|Channel.SEND_OPTIONS_USE_ACK;
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/**
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* Timeout for RPC messages.
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*/
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private long rpcTimeout = DEFAULT_REPL_TIMEOUT;
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/**
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* Flag for whether to terminate this map that failed to start.
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*/
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private boolean terminateOnStartFailure = false;
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/**
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* The timeout for a ping message in replication map.
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*/
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private long accessTimeout = 5000;
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/**
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* Constructor, just calls super()
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*
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*/
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public BackupManager() {
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super();
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}
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//******************************************************************************/
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// ClusterManager Interface
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//******************************************************************************/
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@Override
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public void messageDataReceived(ClusterMessage msg) {
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}
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@Override
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public ClusterMessage requestCompleted(String sessionId) {
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if (!getState().isAvailable()) return null;
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LazyReplicatedMap<String,Session> map =
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(LazyReplicatedMap<String,Session>)sessions;
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map.replicate(sessionId,false);
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return null;
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}
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//=========================================================================
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// OVERRIDE THESE METHODS TO IMPLEMENT THE REPLICATION
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//=========================================================================
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@Override
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public void objectMadePrimary(Object key, Object value) {
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if (value instanceof DeltaSession) {
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DeltaSession session = (DeltaSession)value;
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synchronized (session) {
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session.access();
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session.setPrimarySession(true);
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session.endAccess();
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}
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}
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}
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@Override
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public Session createEmptySession() {
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return new DeltaSession(this);
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}
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@Override
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public String getName() {
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return this.name;
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}
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/**
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* Start this component and implement the requirements
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* of {@link org.apache.catalina.util.LifecycleBase#startInternal()}.
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*
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* Starts the cluster communication channel, this will connect with the
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* other nodes in the cluster, and request the current session state to be
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* transferred to this node.
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*
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* @exception LifecycleException if this component detects a fatal error
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* that prevents this component from being used
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*/
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@Override
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protected synchronized void startInternal() throws LifecycleException {
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super.startInternal();
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try {
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if (cluster == null) throw new LifecycleException(sm.getString("backupManager.noCluster", getName()));
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LazyReplicatedMap<String,Session> map = new LazyReplicatedMap<>(
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this, cluster.getChannel(), rpcTimeout, getMapName(),
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getClassLoaders(), terminateOnStartFailure);
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map.setChannelSendOptions(mapSendOptions);
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map.setAccessTimeout(accessTimeout);
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this.sessions = map;
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} catch ( Exception x ) {
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log.error(sm.getString("backupManager.startUnable", getName()),x);
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throw new LifecycleException(sm.getString("backupManager.startFailed", getName()),x);
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}
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setState(LifecycleState.STARTING);
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}
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public String getMapName() {
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String name = cluster.getManagerName(getName(),this)+"-"+"map";
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if ( log.isDebugEnabled() ) log.debug("Backup manager, Setting map name to:"+name);
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return name;
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}
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/**
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* Stop this component and implement the requirements
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* of {@link org.apache.catalina.util.LifecycleBase#stopInternal()}.
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*
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* This will disconnect the cluster communication channel and stop the
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* listener thread.
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*
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* @exception LifecycleException if this component detects a fatal error
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* that prevents this component from being used
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*/
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@Override
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protected synchronized void stopInternal() throws LifecycleException {
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if (log.isDebugEnabled())
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log.debug(sm.getString("backupManager.stopped", getName()));
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setState(LifecycleState.STOPPING);
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if (sessions instanceof LazyReplicatedMap) {
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LazyReplicatedMap<String,Session> map =
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(LazyReplicatedMap<String,Session>)sessions;
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map.breakdown();
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}
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super.stopInternal();
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}
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@Override
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public void setName(String name) {
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this.name = name;
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}
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public void setMapSendOptions(int mapSendOptions) {
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this.mapSendOptions = mapSendOptions;
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}
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public int getMapSendOptions() {
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return mapSendOptions;
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}
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public void setRpcTimeout(long rpcTimeout) {
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this.rpcTimeout = rpcTimeout;
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}
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public long getRpcTimeout() {
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return rpcTimeout;
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}
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public void setTerminateOnStartFailure(boolean terminateOnStartFailure) {
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this.terminateOnStartFailure = terminateOnStartFailure;
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}
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public boolean isTerminateOnStartFailure() {
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return terminateOnStartFailure;
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}
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public long getAccessTimeout() {
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return accessTimeout;
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}
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public void setAccessTimeout(long accessTimeout) {
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this.accessTimeout = accessTimeout;
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}
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@Override
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public String[] getInvalidatedSessions() {
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return new String[0];
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}
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@Override
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public ClusterManager cloneFromTemplate() {
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BackupManager result = new BackupManager();
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clone(result);
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result.mapSendOptions = mapSendOptions;
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result.rpcTimeout = rpcTimeout;
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result.terminateOnStartFailure = terminateOnStartFailure;
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result.accessTimeout = accessTimeout;
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return result;
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}
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@Override
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public int getActiveSessionsFull() {
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LazyReplicatedMap<String,Session> map =
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(LazyReplicatedMap<String,Session>)sessions;
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return map.sizeFull();
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}
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@Override
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public Set<String> getSessionIdsFull() {
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Set<String> sessionIds = new HashSet<>();
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LazyReplicatedMap<String,Session> map =
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(LazyReplicatedMap<String,Session>)sessions;
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for (String id : map.keySetFull()) {
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sessionIds.add(id);
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}
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return sessionIds;
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}
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}
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