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products/sources/formale Sprachen/Java/Tomcat/java/org/apache/catalina/ha/session/ (Apache Software Stiftung Version 2.4.65^©) Datei vom 10.10.2023 mit Größe 52 kB

Quelle DeltaManager.java Sprache: JAVA

/*
* 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 org.apache.catalina.ha.session;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Date;

import org.apache.catalina.Engine;
import org.apache.catalina.Host;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleState;
import org.apache.catalina.Session;
import org.apache.catalina.ha.ClusterManager;
import org.apache.catalina.ha.ClusterMessage;
import org.apache.catalina.tribes.Channel;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.io.ReplicationStream;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.res.StringManager;

/**
* The DeltaManager manages replicated sessions by only replicating the deltas in data. For applications written to
* handle this, the DeltaManager is the optimal way of replicating data.
* 
* This code is almost identical to StandardManager with a difference in how it persists sessions and some modifications
* to it.
* 
* IMPLEMENTATION NOTE : Correct behavior of session storing and reloading depends upon external calls to the
* <code>start()</code> and <code>stop()</code> methods of this class at the correct times.
*
* @author Craig R. McClanahan
* @author Peter Rossbach
*/
public class DeltaManager extends ClusterManagerBase {

 // ---------------------------------------------------- Security Classes
 public final Log log = LogFactory.getLog(DeltaManager.class);

 /**
 * The string manager for this package.
 */
 protected static final StringManager sm = StringManager.getManager(DeltaManager.class);

 // ----------------------------------------------------- Instance Variables

 protected String name = null;

 private boolean expireSessionsOnShutdown = false;
 private boolean notifySessionListenersOnReplication = true;
 private boolean notifyContainerListenersOnReplication = true;
 private volatile boolean stateTransferred = false;
 private volatile boolean noContextManagerReceived = false;
 private int stateTransferTimeout = 60;
 private boolean sendAllSessions = true;
 private int sendAllSessionsSize = 1000;

 /**
 * wait time between send session block (default 2 sec)
 */
 private int sendAllSessionsWaitTime = 2 * 1000;
 private final ArrayList<SessionMessage> receivedMessageQueue = new ArrayList<>();
 private boolean receiverQueue = false;
 private boolean stateTimestampDrop = true;
 private volatile long stateTransferCreateSendTime;

 // -------------------------------------------------------- stats attributes

 private volatile long sessionReplaceCounter = 0;
 private volatile long counterReceive_EVT_GET_ALL_SESSIONS = 0;
 private volatile long counterReceive_EVT_ALL_SESSION_DATA = 0;
 private volatile long counterReceive_EVT_SESSION_CREATED = 0;
 private volatile long counterReceive_EVT_SESSION_EXPIRED = 0;
 private volatile long counterReceive_EVT_SESSION_ACCESSED = 0;
 private volatile long counterReceive_EVT_SESSION_DELTA = 0;
 private volatile int counterReceive_EVT_ALL_SESSION_TRANSFERCOMPLETE = 0;
 private volatile long counterReceive_EVT_CHANGE_SESSION_ID = 0;
 private volatile long counterReceive_EVT_ALL_SESSION_NOCONTEXTMANAGER = 0;
 private volatile long counterSend_EVT_GET_ALL_SESSIONS = 0;
 private volatile long counterSend_EVT_ALL_SESSION_DATA = 0;
 private volatile long counterSend_EVT_SESSION_CREATED = 0;
 private volatile long counterSend_EVT_SESSION_DELTA = 0;
 private volatile long counterSend_EVT_SESSION_ACCESSED = 0;
 private volatile long counterSend_EVT_SESSION_EXPIRED = 0;
 private volatile int counterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE = 0;
 private volatile long counterSend_EVT_CHANGE_SESSION_ID = 0;
 private volatile int counterNoStateTransferred = 0;

 // ------------------------------------------------------------- Constructor
 public DeltaManager() {
 super();
 }

 // ------------------------------------------------------------- Properties

 @Override
 public void setName(String name) {
 this.name = name;
 }

 @Override
 public String getName() {
 return name;
 }

 /**
 * @return Returns the counterSend_EVT_GET_ALL_SESSIONS.
 */
 public long getCounterSend_EVT_GET_ALL_SESSIONS() {
 return counterSend_EVT_GET_ALL_SESSIONS;
 }

 /**
 * @return Returns the counterSend_EVT_SESSION_ACCESSED.
 */
 public long getCounterSend_EVT_SESSION_ACCESSED() {
 return counterSend_EVT_SESSION_ACCESSED;
 }

 /**
 * @return Returns the counterSend_EVT_SESSION_CREATED.
 */
 public long getCounterSend_EVT_SESSION_CREATED() {
 return counterSend_EVT_SESSION_CREATED;
 }

 /**
 * @return Returns the counterSend_EVT_SESSION_DELTA.
 */
 public long getCounterSend_EVT_SESSION_DELTA() {
 return counterSend_EVT_SESSION_DELTA;
 }

 /**
 * @return Returns the counterSend_EVT_SESSION_EXPIRED.
 */
 public long getCounterSend_EVT_SESSION_EXPIRED() {
 return counterSend_EVT_SESSION_EXPIRED;
 }

 /**
 * @return Returns the counterSend_EVT_ALL_SESSION_DATA.
 */
 public long getCounterSend_EVT_ALL_SESSION_DATA() {
 return counterSend_EVT_ALL_SESSION_DATA;
 }

 /**
 * @return Returns the counterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE.
 */
 public int getCounterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE() {
 return counterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE;
 }

 /**
 * @return Returns the counterSend_EVT_CHANGE_SESSION_ID.
 */
 public long getCounterSend_EVT_CHANGE_SESSION_ID() {
 return counterSend_EVT_CHANGE_SESSION_ID;
 }

 /**
 * @return Returns the counterReceive_EVT_ALL_SESSION_DATA.
 */
 public long getCounterReceive_EVT_ALL_SESSION_DATA() {
 return counterReceive_EVT_ALL_SESSION_DATA;
 }

 /**
 * @return Returns the counterReceive_EVT_GET_ALL_SESSIONS.
 */
 public long getCounterReceive_EVT_GET_ALL_SESSIONS() {
 return counterReceive_EVT_GET_ALL_SESSIONS;
 }

 /**
 * @return Returns the counterReceive_EVT_SESSION_ACCESSED.
 */
 public long getCounterReceive_EVT_SESSION_ACCESSED() {
 return counterReceive_EVT_SESSION_ACCESSED;
 }

 /**
 * @return Returns the counterReceive_EVT_SESSION_CREATED.
 */
 public long getCounterReceive_EVT_SESSION_CREATED() {
 return counterReceive_EVT_SESSION_CREATED;
 }

 /**
 * @return Returns the counterReceive_EVT_SESSION_DELTA.
 */
 public long getCounterReceive_EVT_SESSION_DELTA() {
 return counterReceive_EVT_SESSION_DELTA;
 }

 /**
 * @return Returns the counterReceive_EVT_SESSION_EXPIRED.
 */
 public long getCounterReceive_EVT_SESSION_EXPIRED() {
 return counterReceive_EVT_SESSION_EXPIRED;
 }

 /**
 * @return Returns the counterReceive_EVT_ALL_SESSION_TRANSFERCOMPLETE.
 */
 public int getCounterReceive_EVT_ALL_SESSION_TRANSFERCOMPLETE() {
 return counterReceive_EVT_ALL_SESSION_TRANSFERCOMPLETE;
 }

 /**
 * @return Returns the counterReceive_EVT_CHANGE_SESSION_ID.
 */
 public long getCounterReceive_EVT_CHANGE_SESSION_ID() {
 return counterReceive_EVT_CHANGE_SESSION_ID;
 }

 /**
 * @return Returns the counterReceive_EVT_ALL_SESSION_NOCONTEXTMANAGER.
 */
 public long getCounterReceive_EVT_ALL_SESSION_NOCONTEXTMANAGER() {
 return counterReceive_EVT_ALL_SESSION_NOCONTEXTMANAGER;
 }

 /**
 * @return Returns the sessionReplaceCounter.
 */
 public long getSessionReplaceCounter() {
 return sessionReplaceCounter;
 }

 /**
 * @return Returns the counterNoStateTransferred.
 */
 public int getCounterNoStateTransferred() {
 return counterNoStateTransferred;
 }

 public int getReceivedQueueSize() {
 synchronized (receivedMessageQueue) {
 return receivedMessageQueue.size();
 }
 }

 /**
 * @return Returns the stateTransferTimeout.
 */
 public int getStateTransferTimeout() {
 return stateTransferTimeout;
 }

 /**
 * @param timeoutAllSession The timeout
 */
 public void setStateTransferTimeout(int timeoutAllSession) {
 this.stateTransferTimeout = timeoutAllSession;
 }

 /**
 * @return <code>true</code> if the state transfer is complete.
 */
 public boolean getStateTransferred() {
 return stateTransferred;
 }

 /**
 * Set that state transferred is complete
 *
 * @param stateTransferred Flag value
 */
 public void setStateTransferred(boolean stateTransferred) {
 this.stateTransferred = stateTransferred;
 }

 public boolean isNoContextManagerReceived() {
 return noContextManagerReceived;
 }

 public void setNoContextManagerReceived(boolean noContextManagerReceived) {
 this.noContextManagerReceived = noContextManagerReceived;
 }

 /**
 * @return the sendAllSessionsWaitTime in msec
 */
 public int getSendAllSessionsWaitTime() {
 return sendAllSessionsWaitTime;
 }

 /**
 * @param sendAllSessionsWaitTime The sendAllSessionsWaitTime to set at msec.
 */
 public void setSendAllSessionsWaitTime(int sendAllSessionsWaitTime) {
 this.sendAllSessionsWaitTime = sendAllSessionsWaitTime;
 }

 /**
 * @return the stateTimestampDrop.
 */
 public boolean isStateTimestampDrop() {
 return stateTimestampDrop;
 }

 /**
 * @param isTimestampDrop The new flag value
 */
 public void setStateTimestampDrop(boolean isTimestampDrop) {
 this.stateTimestampDrop = isTimestampDrop;
 }

 /**
 * @return the sendAllSessions.
 */
 public boolean isSendAllSessions() {
 return sendAllSessions;
 }

 /**
 * @param sendAllSessions The sendAllSessions to set.
 */
 public void setSendAllSessions(boolean sendAllSessions) {
 this.sendAllSessions = sendAllSessions;
 }

 /**
 * @return the sendAllSessionsSize.
 */
 public int getSendAllSessionsSize() {
 return sendAllSessionsSize;
 }

 /**
 * @param sendAllSessionsSize The sendAllSessionsSize to set.
 */
 public void setSendAllSessionsSize(int sendAllSessionsSize) {
 this.sendAllSessionsSize = sendAllSessionsSize;
 }

 /**
 * @return the notifySessionListenersOnReplication.
 */
 public boolean isNotifySessionListenersOnReplication() {
 return notifySessionListenersOnReplication;
 }

 /**
 * @param notifyListenersCreateSessionOnReplication The notifySessionListenersOnReplication to set.
 */
 public void setNotifySessionListenersOnReplication(boolean notifyListenersCreateSessionOnReplication) {
 this.notifySessionListenersOnReplication = notifyListenersCreateSessionOnReplication;
 }

 public boolean isExpireSessionsOnShutdown() {
 return expireSessionsOnShutdown;
 }

 public void setExpireSessionsOnShutdown(boolean expireSessionsOnShutdown) {
 this.expireSessionsOnShutdown = expireSessionsOnShutdown;
 }

 public boolean isNotifyContainerListenersOnReplication() {
 return notifyContainerListenersOnReplication;
 }

 public void setNotifyContainerListenersOnReplication(boolean notifyContainerListenersOnReplication) {
 this.notifyContainerListenersOnReplication = notifyContainerListenersOnReplication;
 }

 // --------------------------------------------------------- Public Methods

 @Override
 public Session createSession(String sessionId) {
 return createSession(sessionId, true);
 }

 /**
 * Create new session with check maxActiveSessions and send session creation to other cluster nodes.
 *
 * @param sessionId The session id that should be used for the session
 * @param distribute <code>true</code> to replicate the new session
 *
 * @return The session
 */
 public Session createSession(String sessionId, boolean distribute) {
 DeltaSession session = (DeltaSession) super.createSession(sessionId);
 if (distribute) {
 sendCreateSession(session.getId(), session);
 }
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.createSession.newSession", session.getId(),
 Integer.valueOf(sessions.size())));
 }
 return session;
 }

 /**
 * Send create session event to all backup node
 *
 * @param sessionId The session id of the session
 * @param session The session object
 */
 protected void sendCreateSession(String sessionId, DeltaSession session) {
 if (cluster.getMembers().length > 0) {
 SessionMessage msg = new SessionMessageImpl(getName(), SessionMessage.EVT_SESSION_CREATED, null, sessionId,
 sessionId + "-" + System.currentTimeMillis());
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.sendMessage.newSession", name, sessionId));
 }
 msg.setTimestamp(session.getCreationTime());
 counterSend_EVT_SESSION_CREATED++;
 send(msg);
 }
 }

 /**
 * Send messages to other backup member (domain or all)
 *
 * @param msg Session message
 */
 protected void send(SessionMessage msg) {
 if (cluster != null) {
 cluster.send(msg);
 }
 }

 /**
 * {@inheritDoc}
 * 
 * Creates new DeltaSession instance.
 */
 @Override
 public Session createEmptySession() {
 return new DeltaSession(this);
 }

 @Override
 public String rotateSessionId(Session session) {
 return rotateSessionId(session, true);
 }

 @Override
 public void changeSessionId(Session session, String newId) {
 changeSessionId(session, newId, true);
 }

 protected String rotateSessionId(Session session, boolean notify) {
 String orgSessionID = session.getId();
 String newId = super.rotateSessionId(session);
 if (notify) {
 sendChangeSessionId(session.getId(), orgSessionID);
 }
 return newId;
 }

 protected void changeSessionId(Session session, String newId, boolean notify) {
 String orgSessionID = session.getId();
 super.changeSessionId(session, newId);
 if (notify) {
 sendChangeSessionId(session.getId(), orgSessionID);
 }
 }

 protected void sendChangeSessionId(String newSessionID, String orgSessionID) {
 if (cluster.getMembers().length > 0) {
 try {
 // serialize sessionID
 byte[] data = serializeSessionId(newSessionID);
 // notify change sessionID
 SessionMessage msg = new SessionMessageImpl(getName(), SessionMessage.EVT_CHANGE_SESSION_ID, data,
 orgSessionID, orgSessionID + "-" + System.currentTimeMillis());
 msg.setTimestamp(System.currentTimeMillis());
 counterSend_EVT_CHANGE_SESSION_ID++;
 send(msg);
 } catch (IOException e) {
 log.error(sm.getString("deltaManager.unableSerializeSessionID", newSessionID), e);
 }
 }
 }

 /**
 * serialize sessionID
 *
 * @param sessionId Session id to serialize
 *
 * @return byte array with serialized session id
 *
 * @throws IOException if an input/output error occurs
 */
 protected byte[] serializeSessionId(String sessionId) throws IOException {
 ByteArrayOutputStream bos = new ByteArrayOutputStream();
 ObjectOutputStream oos = new ObjectOutputStream(bos);
 oos.writeUTF(sessionId);
 oos.flush();
 oos.close();
 return bos.toByteArray();
 }

 /**
 * Load sessionID
 *
 * @param data serialized session id
 *
 * @return session id
 *
 * @throws IOException if an input/output error occurs
 */
 protected String deserializeSessionId(byte[] data) throws IOException {
 ReplicationStream ois = getReplicationStream(data);
 String sessionId = ois.readUTF();
 ois.close();
 return sessionId;
 }

 /**
 * Load sessions from other cluster node.
 * 
 * FIXME replace currently sessions with same id without notification.
 * 
 * FIXME SSO handling is not really correct with the session replacement!
 *
 * @param data Serialized data
 *
 * @exception ClassNotFoundException if a serialized class cannot be found during the reload
 * @exception IOException if an input/output error occurs
 */
 protected void deserializeSessions(byte[] data) throws ClassNotFoundException, IOException {

 // Open an input stream to the specified pathname, if any
 // Load the previously unloaded active sessions
 try (ObjectInputStream ois = getReplicationStream(data)) {
 Integer count = (Integer) ois.readObject();
 int n = count.intValue();
 for (int i = 0; i < n; i++) {
 DeltaSession session = (DeltaSession) createEmptySession();
 session.readObjectData(ois);
 session.setManager(this);
 session.setValid(true);
 session.setPrimarySession(false);
 // in case the nodes in the cluster are out of
 // time synch, this will make sure that we have the
 // correct timestamp, isValid returns true, cause
 // accessCount=1
 session.access();
 // make sure that the session gets ready to expire if
 // needed
 session.setAccessCount(0);
 session.resetDeltaRequest();
 // FIXME How inform other session id cache like SingleSignOn
 // increment sessionCounter to correct stats report
 if (findSession(session.getIdInternal()) == null) {
 sessionCounter++;
 } else {
 sessionReplaceCounter++;
 // FIXME better is to grap this sessions again !
 if (log.isWarnEnabled()) {
 log.warn(sm.getString("deltaManager.loading.existing.session", session.getIdInternal()));
 }
 }
 add(session);
 if (notifySessionListenersOnReplication) {
 session.tellNew();
 }
 }
 } catch (ClassNotFoundException e) {
 log.error(sm.getString("deltaManager.loading.cnfe", e), e);
 throw e;
 } catch (IOException e) {
 log.error(sm.getString("deltaManager.loading.ioe", e), e);
 throw e;
 }
 }

 /**
 * Save any currently active sessions in the appropriate persistence mechanism, if any. If persistence is not
 * supported, this method returns without doing anything.
 *
 * @param currentSessions Sessions to serialize
 *
 * @return serialized data
 *
 * @exception IOException if an input/output error occurs
 */
 protected byte[] serializeSessions(Session[] currentSessions) throws IOException {

 // Open an output stream to the specified pathname, if any
 ByteArrayOutputStream fos = new ByteArrayOutputStream();
 try (ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(fos))) {
 oos.writeObject(Integer.valueOf(currentSessions.length));
 for (Session currentSession : currentSessions) {
 ((DeltaSession) currentSession).writeObjectData(oos);
 }
 // Flush and close the output stream
 oos.flush();
 } catch (IOException e) {
 log.error(sm.getString("deltaManager.unloading.ioe", e), e);
 throw e;
 }

 // send object data as byte[]
 return fos.toByteArray();
 }

 /**
 * Start this component and implement the requirements of
 * {@link org.apache.catalina.util.LifecycleBase#startInternal()}.
 *
 * @exception LifecycleException if this component detects a fatal error that prevents this component from being
 * used
 */
 @Override
 protected synchronized void startInternal() throws LifecycleException {

 super.startInternal();

 // Load unloaded sessions, if any
 try {
 if (cluster == null) {
 log.error(sm.getString("deltaManager.noCluster", getName()));
 return;
 } else {
 if (log.isInfoEnabled()) {
 String type = "unknown";
 if (cluster.getContainer() instanceof Host) {
 type = "Host";
 } else if (cluster.getContainer() instanceof Engine) {
 type = "Engine";
 }
 log.info(sm.getString("deltaManager.registerCluster", getName(), type, cluster.getClusterName()));
 }
 }
 if (log.isInfoEnabled()) {
 log.info(sm.getString("deltaManager.startClustering", getName()));
 }

 getAllClusterSessions();

 } catch (Throwable t) {
 ExceptionUtils.handleThrowable(t);
 log.error(sm.getString("deltaManager.managerLoad"), t);
 }

 setState(LifecycleState.STARTING);
 }

 /**
 * get from first session master the backup from all clustered sessions
 *
 * @see #findSessionMasterMember()
 */
 public synchronized void getAllClusterSessions() {
 if (cluster != null && cluster.getMembers().length > 0) {
 long beforeSendTime = System.currentTimeMillis();
 Member mbr = findSessionMasterMember();
 if (mbr == null) { // No domain member found
 return;
 }
 SessionMessage msg = new SessionMessageImpl(this.getName(), SessionMessage.EVT_GET_ALL_SESSIONS, null,
 "GET-ALL", "GET-ALL-" + getName());
 msg.setTimestamp(beforeSendTime);
 // set reference time
 stateTransferCreateSendTime = beforeSendTime;
 // request session state
 counterSend_EVT_GET_ALL_SESSIONS++;
 stateTransferred = false;
 // FIXME This send call block the deploy thread, when sender waitForAck is enabled
 try {
 synchronized (receivedMessageQueue) {
 receiverQueue = true;
 }
 cluster.send(msg, mbr, Channel.SEND_OPTIONS_ASYNCHRONOUS);
 if (log.isInfoEnabled()) {
 log.info(sm.getString("deltaManager.waitForSessionState", getName(), mbr,
 Integer.valueOf(getStateTransferTimeout())));
 }
 // FIXME At sender ack mode this method check only the state
 // transfer and resend is a problem!
 waitForSendAllSessions(beforeSendTime);
 } finally {
 synchronized (receivedMessageQueue) {
 for (SessionMessage smsg : receivedMessageQueue) {
 if (!stateTimestampDrop) {
 messageReceived(smsg, smsg.getAddress());
 } else {
 if (smsg.getEventType() != SessionMessage.EVT_GET_ALL_SESSIONS &&
 smsg.getTimestamp() >= stateTransferCreateSendTime) {
 // FIXME handle EVT_GET_ALL_SESSIONS later
 messageReceived(smsg, smsg.getAddress());
 } else {
 if (log.isWarnEnabled()) {
 log.warn(sm.getString("deltaManager.dropMessage", getName(),
 smsg.getEventTypeString(), new Date(stateTransferCreateSendTime),
 new Date(smsg.getTimestamp())));
 }
 }
 }
 }
 receivedMessageQueue.clear();
 receiverQueue = false;
 }
 }
 } else {
 if (log.isInfoEnabled()) {
 log.info(sm.getString("deltaManager.noMembers", getName()));
 }
 }
 }

 /**
 * Find the master of the session state
 *
 * @return master member of sessions
 */
 protected Member findSessionMasterMember() {
 Member mbr = null;
 Member mbrs[] = cluster.getMembers();
 if (mbrs.length != 0) {
 mbr = mbrs[0];
 }
 if (mbr == null && log.isWarnEnabled()) {
 log.warn(sm.getString("deltaManager.noMasterMember", getName(), ""));
 }
 if (mbr != null && log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.foundMasterMember", getName(), mbr));
 }
 return mbr;
 }

 /**
 * Wait that cluster session state is transferred or timeout after 60 Sec With stateTransferTimeout == -1 wait that
 * backup is transferred (forever mode)
 *
 * @param beforeSendTime Start instant of the operation
 */
 protected void waitForSendAllSessions(long beforeSendTime) {
 long reqStart = System.currentTimeMillis();
 long reqNow = reqStart;
 boolean isTimeout = false;
 if (getStateTransferTimeout() > 0) {
 // wait that state is transferred with timeout check
 do {
 try {
 Thread.sleep(100);
 } catch (Exception sleep) {
 //
 }
 reqNow = System.currentTimeMillis();
 isTimeout = ((reqNow - reqStart) > (1000L * getStateTransferTimeout()));
 } while ((!getStateTransferred()) && (!isTimeout) && (!isNoContextManagerReceived()));
 } else {
 if (getStateTransferTimeout() == -1) {
 // wait that state is transferred
 do {
 try {
 Thread.sleep(100);
 } catch (Exception sleep) {
 }
 } while ((!getStateTransferred()) && (!isNoContextManagerReceived()));
 reqNow = System.currentTimeMillis();
 }
 }
 if (isTimeout) {
 counterNoStateTransferred++;
 log.error(sm.getString("deltaManager.noSessionState", getName(), new Date(beforeSendTime),
 Long.valueOf(reqNow - beforeSendTime)));
 } else if (isNoContextManagerReceived()) {
 if (log.isWarnEnabled()) {
 log.warn(sm.getString("deltaManager.noContextManager", getName(), new Date(beforeSendTime),
 Long.valueOf(reqNow - beforeSendTime)));
 }
 } else {
 if (log.isInfoEnabled()) {
 log.info(sm.getString("deltaManager.sessionReceived", getName(), new Date(beforeSendTime),
 Long.valueOf(reqNow - beforeSendTime)));
 }
 }
 }

 /**
 * Stop this component and implement the requirements of
 * {@link org.apache.catalina.util.LifecycleBase#stopInternal()}.
 *
 * @exception LifecycleException if this component detects a fatal error that prevents this component from being
 * used
 */
 @Override
 protected synchronized void stopInternal() throws LifecycleException {

 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.stopped", getName()));
 }

 setState(LifecycleState.STOPPING);

 // Expire all active sessions
 if (log.isInfoEnabled()) {
 log.info(sm.getString("deltaManager.expireSessions", getName()));
 }
 Session sessions[] = findSessions();
 for (Session value : sessions) {
 DeltaSession session = (DeltaSession) value;
 if (!session.isValid()) {
 continue;
 }
 try {
 session.expire(true, isExpireSessionsOnShutdown());
 } catch (Throwable t) {
 ExceptionUtils.handleThrowable(t);
 }
 }

 // Require a new random number generator if we are restarted
 super.stopInternal();
 }

 // -------------------------------------------------------- Replication
 // Methods

 /**
 * A message was received from another node, this is the callback method to implement if you are interested in
 * receiving replication messages.
 *
 * @param cmsg - the message received.
 */
 @Override
 public void messageDataReceived(ClusterMessage cmsg) {
 if (cmsg instanceof SessionMessage) {
 SessionMessage msg = (SessionMessage) cmsg;
 switch (msg.getEventType()) {
 case SessionMessage.EVT_GET_ALL_SESSIONS:
 case SessionMessage.EVT_SESSION_CREATED:
 case SessionMessage.EVT_SESSION_EXPIRED:
 case SessionMessage.EVT_SESSION_ACCESSED:
 case SessionMessage.EVT_SESSION_DELTA:
 case SessionMessage.EVT_CHANGE_SESSION_ID:
 synchronized (receivedMessageQueue) {
 if (receiverQueue) {
 receivedMessageQueue.add(msg);
 return;
 }
 }
 break;
 default:
 // we didn't queue, do nothing
 break;
 } // switch

 messageReceived(msg, msg.getAddress());
 }
 }

 /**
 * When the request has been completed, the replication valve will notify the manager, and the manager will decide
 * whether any replication is needed or not. If there is a need for replication, the manager will create a session
 * message and that will be replicated. The cluster determines where it gets sent.
 *
 * @param sessionId - the sessionId that just completed.
 *
 * @return a SessionMessage to be sent,
 */
 @Override
 public ClusterMessage requestCompleted(String sessionId) {
 return requestCompleted(sessionId, false);
 }

 /**
 * When the request has been completed, the replication valve will notify the manager, and the manager will decide
 * whether any replication is needed or not. If there is a need for replication, the manager will create a session
 * message and that will be replicated. The cluster determines where it gets sent. Session expiration also calls
 * this method, but with expires == true.
 *
 * @param sessionId - the sessionId that just completed.
 * @param expires - whether this method has been called during session expiration
 *
 * @return a SessionMessage to be sent,
 */
 public ClusterMessage requestCompleted(String sessionId, boolean expires) {
 DeltaSession session = null;
 SessionMessage msg = null;
 try {
 session = (DeltaSession) findSession(sessionId);
 if (session == null) {
 // A parallel request has called session.invalidate() which has
 // removed the session from the Manager.
 return null;
 }
 if (session.isDirty()) {
 counterSend_EVT_SESSION_DELTA++;
 msg = new SessionMessageImpl(getName(), SessionMessage.EVT_SESSION_DELTA, session.getDiff(), sessionId,
 sessionId + "-" + System.currentTimeMillis());
 }
 } catch (IOException x) {
 log.error(sm.getString("deltaManager.createMessage.unableCreateDeltaRequest", sessionId), x);
 return null;
 }
 if (msg == null) {
 if (!expires && !session.isPrimarySession()) {
 counterSend_EVT_SESSION_ACCESSED++;
 msg = new SessionMessageImpl(getName(), SessionMessage.EVT_SESSION_ACCESSED, null, sessionId,
 sessionId + "-" + System.currentTimeMillis());
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.createMessage.accessChangePrimary", getName(), sessionId));
 }
 }
 } else { // log only outside synch block!
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.createMessage.delta", getName(), sessionId));
 }
 }
 if (!expires) {
 session.setPrimarySession(true);
 }
 // check to see if we need to send out an access message
 if (!expires && (msg == null)) {
 long replDelta = System.currentTimeMillis() - session.getLastTimeReplicated();
 if (session.getMaxInactiveInterval() >= 0 && replDelta > (session.getMaxInactiveInterval() * 1000L)) {
 counterSend_EVT_SESSION_ACCESSED++;
 msg = new SessionMessageImpl(getName(), SessionMessage.EVT_SESSION_ACCESSED, null, sessionId,
 sessionId + "-" + System.currentTimeMillis());
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.createMessage.access", getName(), sessionId));
 }
 }
 }

 // update last replicated time
 if (msg != null) {
 session.setLastTimeReplicated(System.currentTimeMillis());
 msg.setTimestamp(session.getLastTimeReplicated());
 }
 return msg;
 }

 /**
 * Reset manager statistics
 */
 public synchronized void resetStatistics() {
 processingTime = 0;
 expiredSessions.set(0);
 synchronized (sessionCreationTiming) {
 sessionCreationTiming.clear();
 while (sessionCreationTiming.size() < TIMING_STATS_CACHE_SIZE) {
 sessionCreationTiming.add(null);
 }
 }
 synchronized (sessionExpirationTiming) {
 sessionExpirationTiming.clear();
 while (sessionExpirationTiming.size() < TIMING_STATS_CACHE_SIZE) {
 sessionExpirationTiming.add(null);
 }
 }
 rejectedSessions = 0;
 sessionReplaceCounter = 0;
 counterNoStateTransferred = 0;
 setMaxActive(getActiveSessions());
 sessionCounter = getActiveSessions();
 counterReceive_EVT_ALL_SESSION_DATA = 0;
 counterReceive_EVT_GET_ALL_SESSIONS = 0;
 counterReceive_EVT_SESSION_ACCESSED = 0;
 counterReceive_EVT_SESSION_CREATED = 0;
 counterReceive_EVT_SESSION_DELTA = 0;
 counterReceive_EVT_SESSION_EXPIRED = 0;
 counterReceive_EVT_ALL_SESSION_TRANSFERCOMPLETE = 0;
 counterReceive_EVT_CHANGE_SESSION_ID = 0;
 counterSend_EVT_ALL_SESSION_DATA = 0;
 counterSend_EVT_GET_ALL_SESSIONS = 0;
 counterSend_EVT_SESSION_ACCESSED = 0;
 counterSend_EVT_SESSION_CREATED = 0;
 counterSend_EVT_SESSION_DELTA = 0;
 counterSend_EVT_SESSION_EXPIRED = 0;
 counterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE = 0;
 counterSend_EVT_CHANGE_SESSION_ID = 0;

 }

 // -------------------------------------------------------- expire

 /**
 * send session expired to other cluster nodes
 *
 * @param id session id
 */
 protected void sessionExpired(String id) {
 if (cluster.getMembers().length > 0) {
 counterSend_EVT_SESSION_EXPIRED++;
 SessionMessage msg = new SessionMessageImpl(getName(), SessionMessage.EVT_SESSION_EXPIRED, null, id,
 id + "-EXPIRED-MSG");
 msg.setTimestamp(System.currentTimeMillis());
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.createMessage.expire", getName(), id));
 }
 send(msg);
 }
 }

 /**
 * Expire all find sessions.
 */
 public void expireAllLocalSessions() {
 long timeNow = System.currentTimeMillis();
 Session sessions[] = findSessions();
 int expireDirect = 0;
 int expireIndirect = 0;

 if (log.isDebugEnabled()) {
 log.debug("Start expire all sessions " + getName() + " at " + timeNow + " sessioncount " + sessions.length);
 }
 for (Session value : sessions) {
 if (value instanceof DeltaSession) {
 DeltaSession session = (DeltaSession) value;
 if (session.isPrimarySession()) {
 if (session.isValid()) {
 session.expire();
 expireDirect++;
 } else {
 expireIndirect++;
 } // end if
 } // end if
 } // end if
 } // for
 long timeEnd = System.currentTimeMillis();
 if (log.isDebugEnabled()) {
 log.debug("End expire sessions " + getName() + " expire processingTime " + (timeEnd - timeNow) +
 " expired direct sessions: " + expireDirect + " expired direct sessions: " + expireIndirect);
 }
 }

 @Override
 public String[] getInvalidatedSessions() {
 return new String[0];
 }

 // -------------------------------------------------------- message receive

 /**
 * This method is called by the received thread when a SessionMessage has been received from one of the other nodes
 * in the cluster.
 *
 * @param msg - the message received
 * @param sender - the sender of the message, this is used if we receive a EVT_GET_ALL_SESSION message, so that we
 * only reply to the requesting node
 */
 protected void messageReceived(SessionMessage msg, Member sender) {
 Thread currentThread = Thread.currentThread();
 ClassLoader contextLoader = currentThread.getContextClassLoader();
 try {

 ClassLoader[] loaders = getClassLoaders();
 currentThread.setContextClassLoader(loaders[0]);
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.eventType", getName(), msg.getEventTypeString(),
 sender));
 }

 switch (msg.getEventType()) {
 case SessionMessage.EVT_GET_ALL_SESSIONS:
 handleGET_ALL_SESSIONS(msg, sender);
 break;
 case SessionMessage.EVT_ALL_SESSION_DATA:
 handleALL_SESSION_DATA(msg, sender);
 break;
 case SessionMessage.EVT_ALL_SESSION_TRANSFERCOMPLETE:
 handleALL_SESSION_TRANSFERCOMPLETE(msg, sender);
 break;
 case SessionMessage.EVT_SESSION_CREATED:
 handleSESSION_CREATED(msg, sender);
 break;
 case SessionMessage.EVT_SESSION_EXPIRED:
 handleSESSION_EXPIRED(msg, sender);
 break;
 case SessionMessage.EVT_SESSION_ACCESSED:
 handleSESSION_ACCESSED(msg, sender);
 break;
 case SessionMessage.EVT_SESSION_DELTA:
 handleSESSION_DELTA(msg, sender);
 break;
 case SessionMessage.EVT_CHANGE_SESSION_ID:
 handleCHANGE_SESSION_ID(msg, sender);
 break;
 case SessionMessage.EVT_ALL_SESSION_NOCONTEXTMANAGER:
 handleALL_SESSION_NOCONTEXTMANAGER(msg, sender);
 break;
 default:
 // we didn't recognize the message type, do nothing
 break;
 } // switch
 } catch (Exception x) {
 log.error(sm.getString("deltaManager.receiveMessage.error", getName()), x);
 } finally {
 currentThread.setContextClassLoader(contextLoader);
 }
 }

 // -------------------------------------------------------- message receiver handler

 /**
 * handle receive session state is complete transferred
 *
 * @param msg Session message
 * @param sender Member which sent the message
 */
 protected void handleALL_SESSION_TRANSFERCOMPLETE(SessionMessage msg, Member sender) {
 counterReceive_EVT_ALL_SESSION_TRANSFERCOMPLETE++;
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.transfercomplete", getName(), sender.getHost(),
 Integer.valueOf(sender.getPort())));
 }
 stateTransferCreateSendTime = msg.getTimestamp();
 stateTransferred = true;
 }

 /**
 * handle receive session delta
 *
 * @param msg Session message
 * @param sender Member which sent the message
 *
 * @throws IOException IO error with serialization
 * @throws ClassNotFoundException Serialization error
 */
 protected void handleSESSION_DELTA(SessionMessage msg, Member sender) throws IOException, ClassNotFoundException {
 counterReceive_EVT_SESSION_DELTA++;
 byte[] delta = msg.getSession();
 DeltaSession session = (DeltaSession) findSession(msg.getSessionID());
 if (session == null) {
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.delta.unknown", getName(), msg.getSessionID()));
 }
 } else {
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.delta", getName(), msg.getSessionID()));
 }

 session.deserializeAndExecuteDeltaRequest(delta);
 }
 }

 /**
 * handle receive session is access at other node ( primary session is now false)
 *
 * @param msg Session message
 * @param sender Member which sent the message
 *
 * @throws IOException Propagated IO error
 */
 protected void handleSESSION_ACCESSED(SessionMessage msg, Member sender) throws IOException {
 counterReceive_EVT_SESSION_ACCESSED++;
 DeltaSession session = (DeltaSession) findSession(msg.getSessionID());
 if (session != null) {
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.accessed", getName(), msg.getSessionID()));
 }
 session.access();
 session.setPrimarySession(false);
 session.endAccess();
 }
 }

 /**
 * handle receive session is expire at other node ( expire session also here)
 *
 * @param msg Session message
 * @param sender Member which sent the message
 *
 * @throws IOException Propagated IO error
 */
 protected void handleSESSION_EXPIRED(SessionMessage msg, Member sender) throws IOException {
 counterReceive_EVT_SESSION_EXPIRED++;
 DeltaSession session = (DeltaSession) findSession(msg.getSessionID());
 if (session != null) {
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.expired", getName(), msg.getSessionID()));
 }
 session.expire(notifySessionListenersOnReplication, false);
 }
 }

 /**
 * handle receive new session is created at other node (create backup - primary false)
 *
 * @param msg Session message
 * @param sender Member which sent the message
 */
 protected void handleSESSION_CREATED(SessionMessage msg, Member sender) {
 counterReceive_EVT_SESSION_CREATED++;
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.createNewSession", getName(), msg.getSessionID()));
 }
 DeltaSession session = (DeltaSession) createEmptySession();
 session.setValid(true);
 session.setPrimarySession(false);
 session.setCreationTime(msg.getTimestamp());
 // use container maxInactiveInterval so that session will expire correctly
 // in case of primary transfer
 session.setMaxInactiveInterval(getContext().getSessionTimeout() * 60, false);
 session.access();
 session.setId(msg.getSessionID(), notifySessionListenersOnReplication);
 session.endAccess();

 }

 /**
 * handle receive sessions from other not ( restart )
 *
 * @param msg Session message
 * @param sender Member which sent the message
 *
 * @throws ClassNotFoundException Serialization error
 * @throws IOException IO error with serialization
 */
 protected void handleALL_SESSION_DATA(SessionMessage msg, Member sender)
 throws ClassNotFoundException, IOException {
 counterReceive_EVT_ALL_SESSION_DATA++;
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.allSessionDataBegin", getName()));
 }
 byte[] data = msg.getSession();
 deserializeSessions(data);
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.allSessionDataAfter", getName()));
 }
 // stateTransferred = true;
 }

 /**
 * Handle a get all sessions message from another node. Depending on {@link #sendAllSessions}, sessions are either
 * sent in a single message or in batches. Sending is complete when this method exits.
 *
 * @param msg Session message
 * @param sender Member which sent the message
 *
 * @throws IOException IO error sending messages
 */
 protected void handleGET_ALL_SESSIONS(SessionMessage msg, Member sender) throws IOException {
 counterReceive_EVT_GET_ALL_SESSIONS++;
 // get a list of all the session from this manager
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.unloadingBegin", getName()));
 }
 // Write the number of active sessions, followed by the details
 // get all sessions and serialize without sync
 Session[] currentSessions = findSessions();
 long findSessionTimestamp = System.currentTimeMillis();
 if (isSendAllSessions()) {
 sendSessions(sender, currentSessions, findSessionTimestamp);
 } else {
 // send sessions in batches
 int remain = currentSessions.length;
 for (int i = 0; i < currentSessions.length; i += getSendAllSessionsSize()) {
 int len = i + getSendAllSessionsSize() > currentSessions.length ? currentSessions.length - i :
 getSendAllSessionsSize();
 Session[] sendSessions = new Session[len];
 System.arraycopy(currentSessions, i, sendSessions, 0, len);
 sendSessions(sender, sendSessions, findSessionTimestamp);
 remain = remain - len;
 if (getSendAllSessionsWaitTime() > 0 && remain > 0) {
 try {
 Thread.sleep(getSendAllSessionsWaitTime());
 } catch (Exception sleep) {
 }
 }
 }
 }

 SessionMessage newmsg = new SessionMessageImpl(name, SessionMessage.EVT_ALL_SESSION_TRANSFERCOMPLETE, null,
 "SESSION-STATE-TRANSFERRED", "SESSION-STATE-TRANSFERRED" + getName());
 newmsg.setTimestamp(findSessionTimestamp);
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.createMessage.allSessionTransferred", getName()));
 }
 counterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE++;
 cluster.send(newmsg, sender);
 }

 /**
 * handle receive change sessionID at other node
 *
 * @param msg Session message
 * @param sender Member which sent the message
 *
 * @throws IOException IO error with serialization
 */
 protected void handleCHANGE_SESSION_ID(SessionMessage msg, Member sender) throws IOException {
 counterReceive_EVT_CHANGE_SESSION_ID++;
 DeltaSession session = (DeltaSession) findSession(msg.getSessionID());
 if (session != null) {
 String newSessionID = deserializeSessionId(msg.getSession());
 session.setPrimarySession(false);
 // change session id
 changeSessionId(session, newSessionID, notifySessionListenersOnReplication,
 notifyContainerListenersOnReplication);
 }
 }

 /**
 * handle receive no context manager.
 *
 * @param msg Session message
 * @param sender Member which sent the message
 */
 protected void handleALL_SESSION_NOCONTEXTMANAGER(SessionMessage msg, Member sender) {
 counterReceive_EVT_ALL_SESSION_NOCONTEXTMANAGER++;
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.noContextManager", getName(), sender.getHost(),
 Integer.valueOf(sender.getPort())));
 }
 noContextManagerReceived = true;
 }

 /**
 * send a block of session to sender
 *
 * @param sender Sender member
 * @param currentSessions Sessions to send
 * @param sendTimestamp Timestamp
 *
 * @throws IOException IO error sending messages
 */
 protected void sendSessions(Member sender, Session[] currentSessions, long sendTimestamp) throws IOException {
 byte[] data = serializeSessions(currentSessions);
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.receiveMessage.unloadingAfter", getName()));
 }
 SessionMessage newmsg = new SessionMessageImpl(name, SessionMessage.EVT_ALL_SESSION_DATA, data, "SESSION-STATE",
 "SESSION-STATE-" + getName());
 newmsg.setTimestamp(sendTimestamp);
 if (log.isDebugEnabled()) {
 log.debug(sm.getString("deltaManager.createMessage.allSessionData", getName()));
 }
 counterSend_EVT_ALL_SESSION_DATA++;
 int sendOptions = Channel.SEND_OPTIONS_SYNCHRONIZED_ACK | Channel.SEND_OPTIONS_USE_ACK;
 cluster.send(newmsg, sender, sendOptions);
 }

 @Override
 public ClusterManager cloneFromTemplate() {
 DeltaManager result = new DeltaManager();
 clone(result);
 result.expireSessionsOnShutdown = expireSessionsOnShutdown;
 result.notifySessionListenersOnReplication = notifySessionListenersOnReplication;
 result.notifyContainerListenersOnReplication = notifyContainerListenersOnReplication;
 result.stateTransferTimeout = stateTransferTimeout;
 result.sendAllSessions = sendAllSessions;
 result.sendAllSessionsSize = sendAllSessionsSize;
 result.sendAllSessionsWaitTime = sendAllSessionsWaitTime;
 result.stateTimestampDrop = stateTimestampDrop;
 return result;
 }
}

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