Tomcat example source code file (DeltaManager.java)
The Tomcat DeltaManager.java source code/*
* 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.beans.PropertyChangeEvent;
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 java.util.Iterator;
import org.apache.catalina.Cluster;
import org.apache.catalina.Container;
import org.apache.catalina.Context;
import org.apache.catalina.Engine;
import org.apache.catalina.Host;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleListener;
import org.apache.catalina.Session;
import org.apache.catalina.Valve;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.ha.CatalinaCluster;
import org.apache.catalina.ha.ClusterMessage;
import org.apache.catalina.ha.tcp.ReplicationValve;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.io.ReplicationStream;
import org.apache.catalina.util.LifecycleSupport;
import org.apache.catalina.util.StringManager;
import org.apache.catalina.ha.ClusterManager;
/**
* 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.
*
* <b>IMPLEMENTATION NOTE : Correct behavior of session storing and
* reloading depends upon external calls to the <code>start() and
* <code>stop() methods of this class at the correct times.
*
* @author Filip Hanik
* @author Craig R. McClanahan
* @author Jean-Francois Arcand
* @author Peter Rossbach
* @version $Revision: 561326 $ $Date: 2007-07-31 15:35:35 +0200 (mar., 31 juil. 2007) $
*/
public class DeltaManager extends ClusterManagerBase{
// ---------------------------------------------------- Security Classes
public static org.apache.juli.logging.Log log = org.apache.juli.logging.LogFactory.getLog(DeltaManager.class);
/**
* The string manager for this package.
*/
protected static StringManager sm = StringManager.getManager(Constants.Package);
// ----------------------------------------------------- Instance Variables
/**
* The descriptive information about this implementation.
*/
private static final String info = "DeltaManager/2.1";
/**
* Has this component been started yet?
*/
private boolean started = false;
/**
* The descriptive name of this Manager implementation (for logging).
*/
protected static String managerName = "DeltaManager";
protected String name = null;
protected boolean defaultMode = false;
private CatalinaCluster cluster = null;
/**
* cached replication valve cluster container!
*/
private ReplicationValve replicationValve = null ;
/**
* The lifecycle event support for this component.
*/
protected LifecycleSupport lifecycle = new LifecycleSupport(this);
/**
* The maximum number of active Sessions allowed, or -1 for no limit.
*/
private int maxActiveSessions = -1;
private boolean expireSessionsOnShutdown = false;
private boolean notifyListenersOnReplication = true;
private boolean notifySessionListenersOnReplication = true;
private boolean stateTransfered = false ;
private int stateTransferTimeout = 60;
private boolean sendAllSessions = true;
private boolean sendClusterDomainOnly = true ;
private int sendAllSessionsSize = 1000 ;
/**
* wait time between send session block (default 2 sec)
*/
private int sendAllSessionsWaitTime = 2 * 1000 ;
private ArrayList receivedMessageQueue = new ArrayList() ;
private boolean receiverQueue = false ;
private boolean stateTimestampDrop = true ;
private long stateTransferCreateSendTime;
// ------------------------------------------------------------------ stats attributes
int rejectedSessions = 0;
private long sessionReplaceCounter = 0 ;
long processingTime = 0;
private long counterReceive_EVT_GET_ALL_SESSIONS = 0 ;
private long counterSend_EVT_ALL_SESSION_DATA = 0 ;
private long counterReceive_EVT_ALL_SESSION_DATA = 0 ;
private long counterReceive_EVT_SESSION_CREATED = 0 ;
private long counterReceive_EVT_SESSION_EXPIRED = 0;
private long counterReceive_EVT_SESSION_ACCESSED = 0 ;
private long counterReceive_EVT_SESSION_DELTA = 0;
private long counterSend_EVT_GET_ALL_SESSIONS = 0 ;
private long counterSend_EVT_SESSION_CREATED = 0;
private long counterSend_EVT_SESSION_DELTA = 0 ;
private long counterSend_EVT_SESSION_ACCESSED = 0;
private long counterSend_EVT_SESSION_EXPIRED = 0;
private int counterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE = 0 ;
private int counterReceive_EVT_ALL_SESSION_TRANSFERCOMPLETE = 0 ;
private int counterNoStateTransfered = 0 ;
// ------------------------------------------------------------- Constructor
public DeltaManager() {
super();
}
// ------------------------------------------------------------- Properties
/**
* Return descriptive information about this Manager implementation and the
* corresponding version number, in the format
* <code><description>/<version>.
*/
public String getInfo() {
return info;
}
public void setName(String name) {
this.name = name;
}
/**
* Return the descriptive short name of this Manager implementation.
*/
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 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 processingTime.
*/
public long getProcessingTime() {
return processingTime;
}
/**
* @return Returns the sessionReplaceCounter.
*/
public long getSessionReplaceCounter() {
return sessionReplaceCounter;
}
/**
* Number of session creations that failed due to maxActiveSessions
*
* @return The count
*/
public int getRejectedSessions() {
return rejectedSessions;
}
public void setRejectedSessions(int rejectedSessions) {
this.rejectedSessions = rejectedSessions;
}
/**
* @return Returns the counterNoStateTransfered.
*/
public int getCounterNoStateTransfered() {
return counterNoStateTransfered;
}
public int getReceivedQueueSize() {
return receivedMessageQueue.size() ;
}
/**
* @return Returns the stateTransferTimeout.
*/
public int getStateTransferTimeout() {
return stateTransferTimeout;
}
/**
* @param timeoutAllSession The timeout
*/
public void setStateTransferTimeout(int timeoutAllSession) {
this.stateTransferTimeout = timeoutAllSession;
}
/**
* is session state transfered complete?
*
*/
public boolean getStateTransfered() {
return stateTransfered;
}
/**
* set that state ist complete transfered
* @param stateTransfered
*/
public void setStateTransfered(boolean stateTransfered) {
this.stateTransfered = stateTransfered;
}
/**
* @return Returns 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 Returns the sendClusterDomainOnly.
*/
public boolean doDomainReplication() {
return sendClusterDomainOnly;
}
/**
* @param sendClusterDomainOnly The sendClusterDomainOnly to set.
*/
public void setDomainReplication(boolean sendClusterDomainOnly) {
this.sendClusterDomainOnly = sendClusterDomainOnly;
}
/**
* @return Returns the stateTimestampDrop.
*/
public boolean isStateTimestampDrop() {
return stateTimestampDrop;
}
/**
* @param isTimestampDrop The new flag value
*/
public void setStateTimestampDrop(boolean isTimestampDrop) {
this.stateTimestampDrop = isTimestampDrop;
}
/**
* Return the maximum number of active Sessions allowed, or -1 for no limit.
*/
public int getMaxActiveSessions() {
return (this.maxActiveSessions);
}
/**
* Set the maximum number of actives Sessions allowed, or -1 for no limit.
*
* @param max
* The new maximum number of sessions
*/
public void setMaxActiveSessions(int max) {
int oldMaxActiveSessions = this.maxActiveSessions;
this.maxActiveSessions = max;
support.firePropertyChange("maxActiveSessions", new Integer(oldMaxActiveSessions), new Integer(this.maxActiveSessions));
}
/**
*
* @return Returns the sendAllSessions.
*/
public boolean isSendAllSessions() {
return sendAllSessions;
}
/**
* @param sendAllSessions The sendAllSessions to set.
*/
public void setSendAllSessions(boolean sendAllSessions) {
this.sendAllSessions = sendAllSessions;
}
/**
* @return Returns the sendAllSessionsSize.
*/
public int getSendAllSessionsSize() {
return sendAllSessionsSize;
}
/**
* @param sendAllSessionsSize The sendAllSessionsSize to set.
*/
public void setSendAllSessionsSize(int sendAllSessionsSize) {
this.sendAllSessionsSize = sendAllSessionsSize;
}
/**
* @return Returns 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 isNotifyListenersOnReplication() {
return notifyListenersOnReplication;
}
public void setNotifyListenersOnReplication(boolean notifyListenersOnReplication) {
this.notifyListenersOnReplication = notifyListenersOnReplication;
}
/**
* @return Returns the defaultMode.
*/
public boolean isDefaultMode() {
return defaultMode;
}
/**
* @param defaultMode The defaultMode to set.
*/
public void setDefaultMode(boolean defaultMode) {
this.defaultMode = defaultMode;
}
public CatalinaCluster getCluster() {
return cluster;
}
public void setCluster(CatalinaCluster cluster) {
this.cluster = cluster;
}
/**
* Set the Container with which this Manager has been associated. If it is a
* Context (the usual case), listen for changes to the session timeout
* property.
*
* @param container
* The associated Container
*/
public void setContainer(Container container) {
// De-register from the old Container (if any)
if ((this.container != null) && (this.container instanceof Context))
((Context) this.container).removePropertyChangeListener(this);
// Default processing provided by our superclass
super.setContainer(container);
// Register with the new Container (if any)
if ((this.container != null) && (this.container instanceof Context)) {
setMaxInactiveInterval(((Context) this.container).getSessionTimeout() * 60);
((Context) this.container).addPropertyChangeListener(this);
}
}
// --------------------------------------------------------- Public Methods
/**
* Construct and return a new session object, based on the default settings
* specified by this Manager's properties. The session id will be assigned
* by this method, and available via the getId() method of the returned
* session. If a new session cannot be created for any reason, return
* <code>null.
*
* @exception IllegalStateException
* if a new session cannot be instantiated for any reason
*
* Construct and return a new session object, based on the default settings
* specified by this Manager's properties. The session id will be assigned
* by this method, and available via the getId() method of the returned
* session. If a new session cannot be created for any reason, return
* <code>null.
*
* @exception IllegalStateException
* if a new session cannot be instantiated for any reason
*/
public Session createSession(String sessionId) {
return createSession(sessionId, true);
}
/**
* create new session with check maxActiveSessions and send session creation
* to other cluster nodes.
*
* @param distribute
* @return The session
*/
public Session createSession(String sessionId, boolean distribute) {
if ((maxActiveSessions >= 0) && (sessions.size() >= maxActiveSessions)) {
rejectedSessions++;
throw new IllegalStateException(sm.getString("deltaManager.createSession.ise"));
}
DeltaSession session = (DeltaSession) super.createSession(sessionId) ;
if (distribute) {
sendCreateSession(session.getId(), session);
}
if (log.isDebugEnabled())
log.debug(sm.getString("deltaManager.createSession.newSession",session.getId(), new Integer(sessions.size())));
return (session);
}
/**
* Send create session evt to all backup node
* @param sessionId
* @param session
*/
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) {
if(doDomainReplication())
cluster.sendClusterDomain(msg);
else
cluster.send(msg);
}
}
/**
* Create DeltaSession
* @see org.apache.catalina.Manager#createEmptySession()
*/
public Session createEmptySession() {
return getNewDeltaSession() ;
}
/**
* Get new session class to be used in the doLoad() method.
*/
protected DeltaSession getNewDeltaSession() {
return new DeltaSession(this);
}
/**
* Load Deltarequest from external node
* Load the Class at container classloader
* @see DeltaRequest#readExternal(java.io.ObjectInput)
* @param session
* @param data message data
* @return The request
* @throws ClassNotFoundException
* @throws IOException
*/
protected DeltaRequest deserializeDeltaRequest(DeltaSession session, byte[] data) throws ClassNotFoundException, IOException {
ReplicationStream ois = getReplicationStream(data);
session.getDeltaRequest().readExternal(ois);
ois.close();
return session.getDeltaRequest();
}
/**
* serialize DeltaRequest
* @see DeltaRequest#writeExternal(java.io.ObjectOutput)
*
* @param deltaRequest
* @return serialized delta request
* @throws IOException
*/
protected byte[] serializeDeltaRequest(DeltaRequest deltaRequest) throws IOException {
return deltaRequest.serialize();
}
/**
* Load sessions from other cluster node.
* FIXME replace currently sessions with same id without notifcation.
* FIXME SSO handling is not really correct with the session replacement!
* @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 {
// Initialize our internal data structures
//sessions.clear(); //should not do this
// Open an input stream to the specified pathname, if any
ClassLoader originalLoader = Thread.currentThread().getContextClassLoader();
ObjectInputStream ois = null;
// Load the previously unloaded active sessions
try {
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);
}
} 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;
} finally {
// Close the input stream
try {
if (ois != null) ois.close();
} catch (IOException f) {
// ignored
}
ois = null;
if (originalLoader != null) Thread.currentThread().setContextClassLoader(originalLoader);
}
}
/**
* Save any currently active sessions in the appropriate persistence
* mechanism, if any. If persistence is not supported, this method returns
* without doing anything.
*
* @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 = null;
ObjectOutputStream oos = null;
try {
fos = new ByteArrayOutputStream();
oos = new ObjectOutputStream(new BufferedOutputStream(fos));
oos.writeObject(new Integer(currentSessions.length));
for(int i=0 ; i < currentSessions.length;i++) {
((DeltaSession)currentSessions[i]).writeObjectData(oos);
}
// Flush and close the output stream
oos.flush();
} catch (IOException e) {
log.error(sm.getString("deltaManager.unloading.ioe", e), e);
throw e;
} finally {
if (oos != null) {
try {
oos.close();
} catch (IOException f) {
;
}
oos = null;
}
}
// send object data as byte[]
return fos.toByteArray();
}
// ------------------------------------------------------ Lifecycle Methods
/**
* Add a lifecycle event listener to this component.
*
* @param listener
* The listener to add
*/
public void addLifecycleListener(LifecycleListener listener) {
lifecycle.addLifecycleListener(listener);
}
/**
* Get the lifecycle listeners associated with this lifecycle. If this
* Lifecycle has no listeners registered, a zero-length array is returned.
*/
public LifecycleListener[] findLifecycleListeners() {
return lifecycle.findLifecycleListeners();
}
/**
* Remove a lifecycle event listener from this component.
*
* @param listener
* The listener to remove
*/
public void removeLifecycleListener(LifecycleListener listener) {
lifecycle.removeLifecycleListener(listener);
}
/**
* Prepare for the beginning of active use of the public methods of this
* component. This method should be called after <code>configure(),
* and before any of the public methods of the component are utilized.
*
* @exception LifecycleException
* if this component detects a fatal error that prevents this
* component from being used
*/
public void start() throws LifecycleException {
if (!initialized) init();
// Validate and update our current component state
if (started) {
return;
}
started = true;
lifecycle.fireLifecycleEvent(START_EVENT, null);
// Force initialization of the random number generator
generateSessionId();
// Load unloaded sessions, if any
try {
//the channel is already running
Cluster cluster = getCluster() ;
// stop remove cluster binding
//wow, how many nested levels of if statements can we have ;)
if(cluster == null) {
Container context = getContainer() ;
if(context != null && context instanceof Context) {
Container host = context.getParent() ;
if(host != null && host instanceof Host) {
cluster = host.getCluster();
if(cluster != null && cluster instanceof CatalinaCluster) {
setCluster((CatalinaCluster) cluster) ;
} else {
Container engine = host.getParent() ;
if(engine != null && engine instanceof Engine) {
cluster = engine.getCluster();
if(cluster != null && cluster instanceof CatalinaCluster) {
setCluster((CatalinaCluster) cluster) ;
}
} else {
cluster = null ;
}
}
}
}
}
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()));
//to survice context reloads, as only a stop/start is called, not
// createManager
cluster.registerManager(this);
getAllClusterSessions();
} catch (Throwable t) {
log.error(sm.getString("deltaManager.managerLoad"), t);
}
}
/**
* 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());
// set reference time
stateTransferCreateSendTime = beforeSendTime ;
// request session state
counterSend_EVT_GET_ALL_SESSIONS++;
stateTransfered = false ;
// FIXME This send call block the deploy thread, when sender waitForAck is enabled
try {
synchronized(receivedMessageQueue) {
receiverQueue = true ;
}
cluster.send(msg, mbr);
if (log.isWarnEnabled()) log.warn(sm.getString("deltaManager.waitForSessionState",getName(), mbr));
// FIXME At sender ack mode this method check only the state transfer and resend is a problem!
waitForSendAllSessions(beforeSendTime);
} finally {
synchronized(receivedMessageQueue) {
for (Iterator iter = receivedMessageQueue.iterator(); iter.hasNext();) {
SessionMessage smsg = (SessionMessage) iter.next();
if (!stateTimestampDrop) {
messageReceived(smsg, smsg.getAddress() != null ? (Member) smsg.getAddress() : null);
} else {
if (smsg.getEventType() != SessionMessage.EVT_GET_ALL_SESSIONS && smsg.getTimestamp() >= stateTransferCreateSendTime) {
// FIXME handle EVT_GET_ALL_SESSIONS later
messageReceived(smsg,smsg.getAddress() != null ? (Member) smsg.getAddress() : null);
} 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()));
}
}
/**
* Register cross context session at replication valve thread local
* @param session cross context session
*/
protected void registerSessionAtReplicationValve(DeltaSession session) {
if(replicationValve == null) {
if(container instanceof StandardContext && ((StandardContext)container).getCrossContext()) {
Cluster cluster = getCluster() ;
if(cluster != null && cluster instanceof CatalinaCluster) {
Valve[] valves = ((CatalinaCluster)cluster).getValves();
if(valves != null && valves.length > 0) {
for(int i=0; replicationValve == null && i < valves.length ; i++ ){
if(valves[i] instanceof ReplicationValve) replicationValve = (ReplicationValve)valves[i] ;
}//for
if(replicationValve == null && log.isDebugEnabled()) {
log.debug("no ReplicationValve found for CrossContext Support");
}//endif
}//end if
}//endif
}//end if
}//end if
if(replicationValve != null) {
replicationValve.registerReplicationSession(session);
}
}
/**
* 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.warn(sm.getString("deltaManager.foundMasterMember",getName(), mbr));
return mbr;
}
/**
* Wait that cluster session state is transfer or timeout after 60 Sec
* With stateTransferTimeout == -1 wait that backup is transfered (forever mode)
*/
protected void waitForSendAllSessions(long beforeSendTime) {
long reqStart = System.currentTimeMillis();
long reqNow = reqStart ;
boolean isTimeout = false;
if(getStateTransferTimeout() > 0) {
// wait that state is transfered with timeout check
do {
try {
Thread.sleep(100);
} catch (Exception sleep) {
//
}
reqNow = System.currentTimeMillis();
isTimeout = ((reqNow - reqStart) > (1000 * getStateTransferTimeout()));
} while ((!getStateTransfered()) && (!isTimeout));
} else {
if(getStateTransferTimeout() == -1) {
// wait that state is transfered
do {
try {
Thread.sleep(100);
} catch (Exception sleep) {
}
} while ((!getStateTransfered()));
reqNow = System.currentTimeMillis();
}
}
if (isTimeout || (!getStateTransfered())) {
counterNoStateTransfered++ ;
log.error(sm.getString("deltaManager.noSessionState",getName(),new Date(beforeSendTime),new Long(reqNow - beforeSendTime)));
} else {
if (log.isInfoEnabled())
log.info(sm.getString("deltaManager.sessionReceived",getName(), new Date(beforeSendTime), new Long(reqNow - beforeSendTime)));
}
}
/**
* Gracefully terminate the active use of the public methods of this
* component. This method should be the last one called on a given instance
* of this component.
*
* @exception LifecycleException
* if this component detects a fatal error that needs to be
* reported
*/
public void stop() throws LifecycleException {
if (log.isDebugEnabled())
log.debug(sm.getString("deltaManager.stopped", getName()));
// Validate and update our current component state
if (!started)
throw new LifecycleException(sm.getString("deltaManager.notStarted"));
lifecycle.fireLifecycleEvent(STOP_EVENT, null);
started = false;
// Expire all active sessions
if (log.isInfoEnabled()) log.info(sm.getString("deltaManager.expireSessions", getName()));
Session sessions[] = findSessions();
for (int i = 0; i < sessions.length; i++) {
DeltaSession session = (DeltaSession) sessions[i];
if (!session.isValid())
continue;
try {
session.expire(true, isExpireSessionsOnShutdown());
} catch (Throwable ignore) {
;
}
}
// Require a new random number generator if we are restarted
this.random = null;
getCluster().removeManager(this);
replicationValve = null;
if (initialized) {
destroy();
}
}
// ----------------------------------------- PropertyChangeListener Methods
/**
* Process property change events from our associated Context.
*
* @param event
* The property change event that has occurred
*/
public void propertyChange(PropertyChangeEvent event) {
// Validate the source of this event
if (!(event.getSource() instanceof Context))
return;
// Process a relevant property change
if (event.getPropertyName().equals("sessionTimeout")) {
try {
setMaxInactiveInterval(((Integer) event.getNewValue()).intValue() * 60);
} catch (NumberFormatException e) {
log.error(sm.getString("deltaManager.sessionTimeout", event.getNewValue()));
}
}
}
// -------------------------------------------------------- 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.
*/
public void messageDataReceived(ClusterMessage cmsg) {
if (cmsg != null && 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: {
synchronized(receivedMessageQueue) {
if(receiverQueue) {
receivedMessageQueue.add(msg);
return ;
}
}
break;
}
default: {
//we didn't queue, do nothing
break;
}
} //switch
messageReceived(msg, msg.getAddress() != null ? (Member) msg.getAddress() : null);
}
}
/**
* 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,
*/
public ClusterMessage requestCompleted(String sessionId) {
try {
DeltaSession session = (DeltaSession) findSession(sessionId);
DeltaRequest deltaRequest = session.getDeltaRequest();
SessionMessage msg = null;
boolean isDeltaRequest = false ;
synchronized(deltaRequest) {
isDeltaRequest = deltaRequest.getSize() > 0 ;
if (isDeltaRequest) {
counterSend_EVT_SESSION_DELTA++;
byte[] data = serializeDeltaRequest(deltaRequest);
msg = new SessionMessageImpl(getName(),
SessionMessage.EVT_SESSION_DELTA,
data,
sessionId,
sessionId + "-" + System.currentTimeMillis());
session.resetDeltaRequest();
}
}
if(!isDeltaRequest) {
if(!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));
}
}
session.setPrimarySession(true);
//check to see if we need to send out an access message
if ((msg == null)) {
long replDelta = System.currentTimeMillis() - session.getLastTimeReplicated();
if (replDelta > (getMaxInactiveInterval() * 1000)) {
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());
return msg;
} catch (IOException x) {
log.error(sm.getString("deltaManager.createMessage.unableCreateDeltaRequest",sessionId), x);
return null;
}
}
/**
* Reset manager statistics
*/
public synchronized void resetStatistics() {
processingTime = 0 ;
expiredSessions = 0 ;
rejectedSessions = 0 ;
sessionReplaceCounter = 0 ;
counterNoStateTransfered = 0 ;
maxActive = 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;
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;
}
// -------------------------------------------------------- persistence handler
public void load() {
}
public void unload() {
}
// -------------------------------------------------------- expire
/**
* send session expired to other cluster nodes
*
* @param id
* session id
*/
protected void sessionExpired(String id) {
counterSend_EVT_SESSION_EXPIRED++ ;
SessionMessage msg = new SessionMessageImpl(getName(),SessionMessage.EVT_SESSION_EXPIRED, null, id, id+ "-EXPIRED-MSG");
if (log.isDebugEnabled()) log.debug(sm.getString("deltaManager.createMessage.expire",getName(), id));
send(msg);
}
/**
* Exipre 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 (int i = 0; i < sessions.length; i++) {
if (sessions[i] instanceof DeltaSession) {
DeltaSession session = (DeltaSession) sessions[i];
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() + " exipre processingTime " + (timeEnd - timeNow) + " expired direct sessions: " + expireDirect + " expired direct sessions: " + expireIndirect);
}
/**
* When the manager expires session not tied to a request. The cluster will
* periodically ask for a list of sessions that should expire and that
* should be sent across the wire.
*
* @return The invalidated sessions array
*/
public String[] getInvalidatedSessions() {
return new String[0];
}
// -------------------------------------------------------- message receive
/**
* Test that sender and local domain is the same
*/
protected boolean checkSenderDomain(SessionMessage msg,Member sender) {
boolean sameDomain= true;
if (!sameDomain && log.isWarnEnabled()) {
log.warn(sm.getString("deltaManager.receiveMessage.fromWrongDomain",
new Object[] {getName(),
msg.getEventTypeString(),
sender,
"",
"" }));
}
return sameDomain ;
}
/**
* 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) {
if(doDomainReplication() && !checkSenderDomain(msg,sender)) {
return;
}
ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
try {
ClassLoader[] loaders = getClassLoaders();
if ( loaders != null && loaders.length > 0) Thread.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;
}
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 {
Thread.currentThread().setContextClassLoader(contextLoader);
}
}
// -------------------------------------------------------- message receiver handler
/**
* handle receive session state is complete transfered
* @param msg
* @param sender
*/
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(), new Integer(sender.getPort())));
stateTransferCreateSendTime = msg.getTimestamp() ;
stateTransfered = true ;
}
/**
* handle receive session delta
* @param msg
* @param sender
* @throws IOException
* @throws ClassNotFoundException
*/
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",getName(), msg.getSessionID()));
DeltaRequest dreq = deserializeDeltaRequest(session, delta);
dreq.execute(session, notifyListenersOnReplication);
session.setPrimarySession(false);
}
}
/**
* handle receive session is access at other node ( primary session is now false)
* @param msg
* @param sender
* @throws IOException
*/
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
* @param sender
* @throws IOException
*/
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
* @param sender
*/
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.setManager(this);
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(getMaxInactiveInterval());
session.access();
if(notifySessionListenersOnReplication)
session.setId(msg.getSessionID());
else
session.setIdInternal(msg.getSessionID());
session.resetDeltaRequest();
session.endAccess();
}
/**
* handle receive sessions from other not ( restart )
* @param msg
* @param sender
* @throws ClassNotFoundException
* @throws IOException
*/
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 receive that other node want all sessions ( restart )
* a) send all sessions with one message
* b) send session at blocks
* After sending send state is complete transfered
* @param msg
* @param sender
* @throws IOException
*/
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 session at blocks
int len = currentSessions.length < getSendAllSessionsSize() ? currentSessions.length : getSendAllSessionsSize();
Session[] sendSessions = new Session[len];
for (int i = 0; i < currentSessions.length; i += getSendAllSessionsSize()) {
len = i + getSendAllSessionsSize() > currentSessions.length ? currentSessions.length - i : getSendAllSessionsSize();
System.arraycopy(currentSessions, i, sendSessions, 0, len);
sendSessions(sender, sendSessions,findSessionTimestamp);
if (getSendAllSessionsWaitTime() > 0) {
try {
Thread.sleep(getSendAllSessionsWaitTime());
} catch (Exception sleep) {
}
}//end if
}//for
}//end if
SessionMessage newmsg = new SessionMessageImpl(name,SessionMessage.EVT_ALL_SESSION_TRANSFERCOMPLETE, null,"SESSION-STATE-TRANSFERED", "SESSION-STATE-TRANSFERED"+ getName());
newmsg.setTimestamp(findSessionTimestamp);
if (log.isDebugEnabled()) log.debug(sm.getString("deltaManager.createMessage.allSessionTransfered",getName()));
counterSend_EVT_ALL_SESSION_TRANSFERCOMPLETE++;
cluster.send(newmsg, sender);
}
/**
* send a block of session to sender
* @param sender
* @param currentSessions
* @param sendTimestamp
* @throws IOException
*/
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++;
cluster.send(newmsg, sender);
}
public ClusterManager cloneFromTemplate() {
DeltaManager result = new DeltaManager();
result.name = "Clone-from-"+name;
result.cluster = cluster;
result.replicationValve = replicationValve;
result.maxActiveSessions = maxActiveSessions;
result.expireSessionsOnShutdown = expireSessionsOnShutdown;
result.notifyListenersOnReplication = notifyListenersOnReplication;
result.notifySessionListenersOnReplication = notifySessionListenersOnReplication;
result.stateTransferTimeout = stateTransferTimeout;
result.sendAllSessions = sendAllSessions;
result.sendClusterDomainOnly = sendClusterDomainOnly ;
result.sendAllSessionsSize = sendAllSessionsSize;
result.sendAllSessionsWaitTime = sendAllSessionsWaitTime ;
result.receiverQueue = receiverQueue ;
result.stateTimestampDrop = stateTimestampDrop ;
result.stateTransferCreateSendTime = stateTransferCreateSendTime;
return result;
}
}
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