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// Portions Copyright [2016] [Payara Foundation and/or its affiliates]
package org.apache.catalina.session;
import org.apache.catalina.*;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.security.SecurityUtil;
import org.apache.catalina.util.LifecycleSupport;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.IOException;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.text.MessageFormat;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
/**
* Extends the ManagerBase class to implement most of the
* functionality required by a Manager which supports any kind of
* persistence, even if only for restarts.
*
* IMPLEMENTATION NOTE: Correct behavior of session storing and
* reloading depends upon external calls to the start() and
* stop() methods of this class at the correct times.
*
* @author Craig R. McClanahan
* @author Jean-Francois Arcand
* @version $Revision: 1.16 $ $Date: 2007/05/05 05:32:19 $
*/
public abstract class PersistentManagerBase
extends ManagerBase
implements Lifecycle, PropertyChangeListener {
// ---------------------------------------------------- Security Classes
private class PrivilegedStoreClear
implements PrivilegedExceptionAction {
PrivilegedStoreClear() {
// NOOP
}
public Void run() throws Exception{
store.clear();
return null;
}
}
private class PrivilegedStoreRemove
implements PrivilegedExceptionAction {
private String id;
PrivilegedStoreRemove(String id) {
this.id = id;
}
public Void run() throws Exception{
store.remove(id);
return null;
}
}
private class PrivilegedStoreLoad
implements PrivilegedExceptionAction {
private String id;
PrivilegedStoreLoad(String id) {
this.id = id;
}
public Session run() throws Exception{
return store.load(id);
}
}
private class PrivilegedStoreSave
implements PrivilegedExceptionAction {
private Session session;
PrivilegedStoreSave(Session session) {
this.session = session;
}
public Void run() throws Exception{
store.save(session);
return null;
}
}
private class PrivilegedStoreKeys
implements PrivilegedExceptionAction {
PrivilegedStoreKeys() {
// NOOP
}
public String[] run() throws Exception{
return store.keys();
}
}
// ----------------------------------------------------- Instance Variables
/**
* The descriptive information about this implementation.
*/
private static final String info = "PersistentManagerBase/1.0";
/**
* 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;
/**
* The descriptive name of this Manager implementation (for logging).
*/
protected static final String name = "PersistentManagerBase";
/**
* Has this component been started yet?
*/
private boolean started = false;
/**
* Store object which will manage the Session store.
*/
private Store store = null;
/**
* Whether to save and reload sessions when the Manager unload
* and load methods are called.
*/
private boolean saveOnRestart = true;
/**
* How long a session must be idle before it should be backed up.
* -1 means sessions won't be backed up.
*/
private int maxIdleBackup = -1;
/**
* Minimum time a session must be idle before it is swapped to disk.
* This overrides maxActiveSessions, to prevent thrashing if there are lots
* of active sessions. Setting to -1 means it's ignored.
*/
private int minIdleSwap = -1;
/**
* The maximum time a session may be idle before it should be swapped
* to file just on general principle. Setting this to -1 means sessions
* should not be forced out.
*/
private int maxIdleSwap = -1;
// START SJSAS 6406580
/**
* The set of invalidated Sessions for this Manager, keyed by
* session identifier.
*/
protected ConcurrentHashMap invalidatedSessions
= new ConcurrentHashMap();
// Specifies for how long we're going to remember invalidated session ids
private long rememberInvalidatedSessionIdMilliSecs = 60000L;
// END SJSAS 6406580
// ------------------------------------------------------------- Properties
/**
* Perform the background processes for this Manager
*/
public void backgroundProcess() {
this.processExpires();
this.processPersistenceChecks();
// START SJSAS 6406580
this.processInvalidatedSessions();
// END SJSAS 6406580
if ((this.getStore() != null)
&& (this.getStore() instanceof StoreBase)) {
((StoreBase) this.getStore()).processExpires();
}
}
/**
* Indicates how many seconds old a session can get, after its last
* use in a request, before it should be backed up to the store. -1
* means sessions are not backed up.
*/
public int getMaxIdleBackup() {
return maxIdleBackup;
}
/**
* Sets the option to back sessions up to the Store after they
* are used in a request. Sessions remain available in memory
* after being backed up, so they are not passivated as they are
* when swapped out. The value set indicates how old a session
* may get (since its last use) before it must be backed up: -1
* means sessions are not backed up.
*
* Note that this is not a hard limit: sessions are checked
* against this age limit periodically according to checkInterval.
* This value should be considered to indicate when a session is
* ripe for backing up.
*
* So it is possible that a session may be idle for maxIdleBackup +
* checkInterval seconds, plus the time it takes to handle other
* session expiration, swapping, etc. tasks.
*
* @param backup The number of seconds after their last accessed
* time when they should be written to the Store.
*/
public void setMaxIdleBackup (int backup) {
if (backup == this.maxIdleBackup)
return;
int oldBackup = this.maxIdleBackup;
this.maxIdleBackup = backup;
support.firePropertyChange("maxIdleBackup",
Integer.valueOf(oldBackup),
Integer.valueOf(this.maxIdleBackup));
}
/**
* The time in seconds after which a session should be swapped out of
* memory to disk.
*/
public int getMaxIdleSwap() {
return maxIdleSwap;
}
/**
* Sets the time in seconds after which a session should be swapped out of
* memory to disk.
*/
public void setMaxIdleSwap(int max) {
if (max == this.maxIdleSwap)
return;
int oldMaxIdleSwap = this.maxIdleSwap;
this.maxIdleSwap = max;
support.firePropertyChange("maxIdleSwap",
Integer.valueOf(oldMaxIdleSwap),
Integer.valueOf(this.maxIdleSwap));
}
/**
* The minimum time in seconds that a session must be idle before
* it can be swapped out of memory, or -1 if it can be swapped out
* at any time.
*/
public int getMinIdleSwap() {
return minIdleSwap;
}
/**
* Sets the minimum time in seconds that a session must be idle before
* it can be swapped out of memory due to maxActiveSession. Set it to -1
* if it can be swapped out at any time.
*/
public void setMinIdleSwap(int min) {
if (this.minIdleSwap == min)
return;
int oldMinIdleSwap = this.minIdleSwap;
this.minIdleSwap = min;
support.firePropertyChange("minIdleSwap",
Integer.valueOf(oldMinIdleSwap),
Integer.valueOf(this.minIdleSwap));
}
/**
* 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)) {
setMaxInactiveIntervalSeconds
( ((Context) this.container).getSessionTimeout()*60 );
((Context) this.container).addPropertyChangeListener(this);
}
// START SJSAS 6406580
if (container instanceof StandardContext) {
// Determine for how long we're going to remember invalidated
// session ids
StandardContext ctx = (StandardContext) container;
int frequency = ctx.getManagerChecksFrequency();
int reapIntervalSeconds = ctx.getBackgroundProcessorDelay();
rememberInvalidatedSessionIdMilliSecs
= frequency * reapIntervalSeconds * 1000L * 2;
if (rememberInvalidatedSessionIdMilliSecs <= 0) {
rememberInvalidatedSessionIdMilliSecs = 60000L;
}
}
// END SJSAS 6406580
}
/**
* Return descriptive information about this Manager implementation and
* the corresponding version number, in the format
* <description>/<version>.
*/
public String getInfo() {
return (this.info);
}
/**
* Return true, if the session id is loaded in memory
* otherwise false is returned
*
* @param id The session id for the session to be searched for
*
* @exception IOException if an input/output error occurs while
* processing this request
*/
public boolean isLoaded( String id ){
try {
if ( super.findSession(id) != null )
return true;
} catch (IOException e) {
String msg = MessageFormat.format(rb.getString(LogFacade.CHECKING_IS_LOADED_EXCEPTION),
new Object[] {id, e.getMessage()});
log.log(Level.SEVERE, msg, e);
}
return false;
}
/**
* Return the maximum number of active Sessions allowed, or -1 for
* no limit.
*/
public int getMaxActiveSessions() {
return (this.maxActiveSessions);
}
/**
* Set the maximum number of active 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",
Integer.valueOf(oldMaxActiveSessions),
Integer.valueOf(this.maxActiveSessions));
}
/**
* Return the descriptive short name of this Manager implementation.
*/
public String getName() {
return (name);
}
/**
* Get the started status.
*/
protected boolean isStarted() {
return started;
}
/**
* Set the started flag
*/
protected void setStarted(boolean started) {
this.started = started;
}
/**
* Set the Store object which will manage persistent Session
* storage for this Manager.
*
* @param store the associated Store
*/
public void setStore(Store store) {
this.store = store;
store.setManager(this);
}
/**
* Return the Store object which manages persistent Session
* storage for this Manager.
*/
public Store getStore() {
return (this.store);
}
/**
* Indicates whether sessions are saved when the Manager is shut down
* properly. This requires the unload() method to be called.
*/
public boolean getSaveOnRestart() {
return saveOnRestart;
}
/**
* Set the option to save sessions to the Store when the Manager is
* shut down, then loaded when the Manager starts again. If set to
* false, any sessions found in the Store may still be picked up when
* the Manager is started again.
*
* @param saveOnRestart true if sessions should be saved on restart, false if
* they should be ignored.
*/
public void setSaveOnRestart(boolean saveOnRestart) {
if (saveOnRestart == this.saveOnRestart)
return;
boolean oldSaveOnRestart = this.saveOnRestart;
this.saveOnRestart = saveOnRestart;
support.firePropertyChange("saveOnRestart",
Boolean.valueOf(oldSaveOnRestart),
Boolean.valueOf(this.saveOnRestart));
}
// --------------------------------------------------------- Public Methods
/*
* Releases any resources held by this session manager.
*/
public void release() {
super.release();
clearStore();
}
/**
* Clear all sessions from the Store.
*/
public void clearStore() {
if (store == null)
return;
try {
if (SecurityUtil.isPackageProtectionEnabled()){
try{
AccessController.doPrivileged(new PrivilegedStoreClear());
}catch(PrivilegedActionException ex){
Exception exception = ex.getException();
log.log(Level.SEVERE, LogFacade.CLEARING_STORE_EXCEPTION, exception);
}
} else {
store.clear();
}
} catch (IOException e) {
log.log(Level.SEVERE, LogFacade.CLEARING_STORE_EXCEPTION, e);
}
}
/**
* Invalidate all sessions that have expired.
* Hercules: modified method
*/
protected void processExpires() {
if (!started)
return;
Session sessions[] = findSessions();
for (int i = 0; i < sessions.length; i++) {
StandardSession session = (StandardSession) sessions[i];
/* START CR 6363689
if (!session.isValid()) {
*/
// START CR 6363689
if(!session.getIsValid() || session.hasExpired()) {
// END CR 6363689
if(session.lockBackground()) {
try {
session.expire();
} finally {
session.unlockBackground();
}
}
}
}
}
/**
* Called by the background thread after active sessions have
* been checked for expiration, to allow sessions to be
* swapped out, backed up, etc.
*/
public void processPersistenceChecks() {
processMaxIdleSwaps();
processMaxActiveSwaps();
processMaxIdleBackups();
}
/**
* Purges those session ids from the map of invalidated session ids whose
* time has come up
*/
protected void processInvalidatedSessions() {
if (!started) {
return;
}
long timeNow = System.currentTimeMillis();
for (Map.Entry e : invalidatedSessions.entrySet()) {
String id = e.getKey();
Long timeAdded = e.getValue();
if ((timeAdded == null)
|| (timeNow - timeAdded.longValue() >
rememberInvalidatedSessionIdMilliSecs)) {
removeFromInvalidatedSessions(id);
}
}
}
/**
* Return a new session object as long as the number of active
* sessions does not exceed maxActiveSessions. If there
* aren't too many active sessions, or if there is no limit,
* a session is created or retrieved from the recycled pool.
*
* @exception IllegalStateException if a new session cannot be
* instantiated for any reason
*/
public Session createSession() {
if ((maxActiveSessions >= 0) &&
(sessions.size() >= maxActiveSessions))
throw new IllegalStateException
(rb.getString(LogFacade.CREATE_SESSION_EXCEPTION));
return (super.createSession());
}
// START S1AS8PE 4817642
/**
* Construct and return a new session object, based on the default
* settings specified by this Manager's properties, using the specified
* session id.
*
* IMPLEMENTATION NOTE: This method must be kept in sync with the
* createSession method that takes no arguments.
*
* @param sessionId the session id to assign to the new session
*
* @exception IllegalStateException if a new session cannot be
* instantiated for any reason
*
* @return the new session, or null if a session with the
* requested id already exists
*/
public Session createSession(String sessionId) {
if ((maxActiveSessions >= 0) &&
(sessions.size() >= maxActiveSessions))
throw new IllegalStateException
(rb.getString(LogFacade.CREATE_SESSION_EXCEPTION));
return (super.createSession(sessionId));
}
// END S1AS8PE 4817642
/**
* Return the active Session, associated with this Manager, with the
* specified session id (if any); otherwise return null.
* This method checks the persistence store if persistence is enabled,
* otherwise just uses the functionality from ManagerBase.
*
* @param id The session id for the session to be returned
*
* @exception IllegalStateException if a new session cannot be
* instantiated for any reason
* @exception IOException if an input/output error occurs while
* processing this request
*/
public Session findSession(String id) throws IOException {
//6406580 START
if(!this.isSessionIdValid(id)) {
return null;
}
//6406580 END
Session session = super.findSession(id);
if (session != null)
return (session);
// See if the Session is in the Store
session = swapIn(id);
return (session);
}
/**
* Return the active Session, associated with this Manager, with the
* specified session id (if any); otherwise return null.
* This method first removes the cached copy if removeCachedCopy = true.
* Then this method checks the persistence store if persistence is enabled,
* otherwise just uses the functionality from ManagerBase.
*
* @param id The session id for the session to be returned
* @param removeCachedCopy
*
* @exception IllegalStateException if a new session cannot be
* instantiated for any reason
* @exception IOException if an input/output error occurs while
* processing this request
*/
public Session findSession(String id, boolean removeCachedCopy) throws IOException {
Session theSession = super.findSession(id);
if (theSession != null) {
if(removeCachedCopy) {
//remove from manager cache
removeSuper(theSession);
//remove from store cache if it exists
if ((this.getStore() != null)
&& (this.getStore() instanceof StoreBase)) {
((StoreBase) this.getStore()).removeFromStoreCache(id);
}
theSession = null;
} else {
return (theSession);
}
}
//now do full findSession
theSession = findSession(id);
return theSession;
}
/**
* used by subclasses of PersistentManagerBase
* Hercules: added method
*/
protected Session superFindSession(String id) throws IOException {
return super.findSession(id);
}
/**
* Remove this Session from the active Sessions for this Manager,
* but not from the Store. (Used by the PersistentValve)
*
* @param session Session to be removed
*/
public void removeSuper(Session session) {
super.remove (session);
}
/**
* Load all sessions found in the persistence mechanism, assuming
* they are marked as valid and have not passed their expiration
* limit. If persistence is not supported, this method returns
* without doing anything.
*
* Note that by default, this method is not called by the MiddleManager
* class. In order to use it, a subclass must specifically call it,
* for example in the start() and/or processPersistenceChecks() methods.
*/
public void load() {
// Initialize our internal data structures
sessions.clear();
if (store == null)
return;
String[] ids = null;
try {
if (SecurityUtil.isPackageProtectionEnabled()){
try{
ids = AccessController.doPrivileged(
new PrivilegedStoreKeys());
}catch(PrivilegedActionException ex){
Exception exception = ex.getException();
log.log(Level.SEVERE, LogFacade.STORE_LOADING_EXCEPTION, exception);
}
} else {
ids = store.keys();
}
} catch (IOException e) {
log.log(Level.SEVERE, LogFacade.CANNOT_LOAD_SESSION_EXCEPTION, e);
return;
}
int n = ids.length;
if (n == 0)
return;
if (log.isLoggable(Level.FINE)) {
log.log(Level.FINE, LogFacade.LOADING_PERSISTED_SESSIONS, String.valueOf(n));
}
for (int i = 0; i < n; i++)
try {
swapIn(ids[i]);
} catch (IOException e) {
log.log(Level.SEVERE, LogFacade.FAILED_LOAD_SESSION_EXCEPTION, e);
}
}
/**
* Remove this Session from the active Sessions for this Manager,
* and from the Store.
*
* @param session Session to be removed
*/
public void remove(Session session) {
remove(session, true);
}
/**
* Remove this Session from the active Sessions for this Manager,
* and from the Store.
*
* @param session Session to be removed
* @param persistentRemove - do we remove persistent session too
*/
public void remove(Session session, boolean persistentRemove) {
super.remove (session);
if (persistentRemove && store != null){
removeSession(session.getIdInternal());
}
}
/**
* Remove this Session from the active Sessions for this Manager,
* and from the Store.
*
* @param id Session's id to be removed
*/
private void removeSession(String id){
try {
if (SecurityUtil.isPackageProtectionEnabled()){
try{
AccessController.doPrivileged(new PrivilegedStoreRemove(id));
}catch(PrivilegedActionException ex){
Exception exception = ex.getException();
log.log(Level.SEVERE, LogFacade.STORE_REMOVE_SESSION_EXCEPTION, exception);
}
} else {
store.remove(id);
}
} catch (IOException e) {
log.log(Level.SEVERE, LogFacade.REMOVING_SESSION_EXCEPTION, e);
}
}
// START SJSAS 6406580
/**
* Add this Session id to the set of invalidated Session ids for this
* Manager.
*
* @param sessionId session id to be added
*/
public void addToInvalidatedSessions(String sessionId) {
invalidatedSessions.put(sessionId,
Long.valueOf(System.currentTimeMillis()));
}
/**
* Removes the given session id from the map of invalidated session ids.
*
* @param sessionId The session id to remove
*/
public void removeFromInvalidatedSessions(String sessionId) {
invalidatedSessions.remove(sessionId);
}
/**
* @return true if the given session id is not contained in the map of
* invalidated session ids, false otherwise
*/
public boolean isSessionIdValid(String sessionId) {
return (!invalidatedSessions.containsKey(sessionId));
}
// END SJSAS 6406580
/**
* Save all currently active sessions in the appropriate persistence
* mechanism, if any. If persistence is not supported, this method
* returns without doing anything.
*
* Note that by default, this method is not called by the MiddleManager
* class. In order to use it, a subclass must specifically call it,
* for example in the stop() and/or processPersistenceChecks() methods.
*/
public void unload() {
if (store == null)
return;
Session sessions[] = findSessions();
int n = sessions.length;
if (n == 0)
return;
if (log.isLoggable(Level.FINE)) {
log.log(Level.FINE, LogFacade.SAVING_PERSISTED_SESSION, String.valueOf(n));
}
for (int i = 0; i < n; i++)
try {
swapOut(sessions[i]);
} catch (IOException e) {
// This is logged in writeSession()
}
}
// ------------------------------------------------------ Protected Methods
/**
* Look for a session in the Store and, if found, restore
* it in the Manager's list of active sessions if appropriate.
* The session will be removed from the Store after swapping
* in, but will not be added to the active session list if it
* is invalid or past its expiration.
*/
protected Session swapIn(String id) throws IOException {
return swapIn(id, null);
}
/**
* Look for a session in the Store and, if found, restore
* it in the Manager's list of active sessions if appropriate.
* The session will be removed from the Store after swapping
* in, but will not be added to the active session list if it
* is invalid or past its expiration.
*
* @param id The session id
* @param version The requested session version
*/
protected Session swapIn(String id, String version) throws IOException {
ClassLoader webappCl = null;
ClassLoader curCl = null;
if (getContainer() != null
&& getContainer().getLoader() != null) {
webappCl = getContainer().getLoader().getClassLoader();
curCl = Thread.currentThread().getContextClassLoader();
}
Session sess = null;
if (webappCl != null && curCl != webappCl) {
try {
Thread.currentThread().setContextClassLoader(webappCl);
sess = doSwapIn(id, version);
} finally {
Thread.currentThread().setContextClassLoader(curCl);
}
} else {
sess = doSwapIn(id, version);
}
return sess;
}
/**
* Look for a session in the Store and, if found, restore
* it in the Manager's list of active sessions if appropriate.
* The session will be removed from the Store after swapping
* in, but will not be added to the active session list if it
* is invalid or past its expiration.
*/
private Session doSwapIn(String id, String version) throws IOException {
if (store == null)
return null;
Session session = null;
try {
if (SecurityUtil.isPackageProtectionEnabled()){
try{
session = AccessController.doPrivileged(
new PrivilegedStoreLoad(id));
}catch(PrivilegedActionException ex){
Exception exception = ex.getException();
log.log(Level.SEVERE, LogFacade.STORE_SWAP_IN_EXCEPTION, exception);
if (exception instanceof IOException){
throw (IOException)exception;
} else if (exception instanceof ClassNotFoundException) {
throw (ClassNotFoundException)exception;
}
}
} else {
if (version != null) {
session = ((StoreBase) store).load(id, version);
} else {
session = store.load(id);
}
}
} catch (ClassNotFoundException | ClassCastException e) {
String msg = MessageFormat.format(rb.getString(LogFacade.DESERILIZING_SESSION_EXCEPTION),
new Object[] {id, e});
log.log(Level.WARNING, msg);
return null;
}
if (session == null)
return (null);
if (!session.isValid()) {
log.log(this.store.getManager().getDistributable()? Level.FINE : Level.SEVERE, LogFacade.INVALID_EXPIRED_SESSION_EXCEPTION);
//6406580 START
/* - these lines are calling remove on store redundantly
session.expire();
removeSession(id);
*/
//6406580 END
return (null);
}
if (log.isLoggable(Level.FINE)) {
log.log(Level.FINE, LogFacade.SWAPPING_SESSION_FROM_STORE, id);
}
session.setManager(this);
// make sure the listeners know about it.
((StandardSession)session).tellNew();
add(session);
((StandardSession)session).activate();
return (session);
}
/**
* Remove the session from the Manager's list of active
* sessions and write it out to the Store. If the session
* is past its expiration or invalid, this method does
* nothing.
*
* @param session The Session to write out.
*/
protected void swapOut(Session session) throws IOException {
if (store == null || !session.isValid()) {
return;
}
((StandardSession)session).passivate();
writeSession(session);
super.remove(session);
session.recycle();
}
/**
* Write the provided session to the Store without modifying
* the copy in memory or triggering passivation events. Does
* nothing if the session is invalid or past its expiration.
*/
protected void writeSession(Session session) throws IOException {
if (store == null || !session.isValid()) {
return;
}
((StandardContext)getContainer()).sessionPersistedStartEvent(
(StandardSession) session);
// If the given session is being persisted after a lock has been
// acquired out-of-band, its version needs to be incremented
// here (otherwise, it will have already been incremented at the
// time the session was acquired via HttpServletRequest.getSession())
if (isSessionVersioningSupported()
&& ((StandardSession) session).hasNonHttpLockOccurred()) {
((StandardSession) session).incrementVersion();
}
try {
if (SecurityUtil.isPackageProtectionEnabled()){
try{
AccessController.doPrivileged(new PrivilegedStoreSave(session));
} catch(PrivilegedActionException ex){
Exception exception = ex.getException();
log.log(Level.SEVERE, LogFacade.STORE_WRITE_SESSION_EXCEPTION,
exception);
}
} else {
store.save(session);
}
} catch (IOException e) {
log.log(Level.SEVERE,LogFacade.SERIALIZING_SESSION_EXCEPTION, new Object[] {session.getIdInternal(), e});
throw e;
} finally {
((StandardContext)getContainer()).sessionPersistedEndEvent(
(StandardSession) session);
}
}
// -------------------------------------------------- Lifecycle Methods
/**
* Add a lifecycle event listener to this component.
*
* @param listener The listener to add
*/
public void addLifecycleListener(LifecycleListener listener) {
lifecycle.addLifecycleListener(listener);
}
/**
* Gets the (possibly empty) list of lifecycle listeners associated
* with this session manager.
*/
public List 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 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 {
// Validate and update our current component state
if (started) {
if (log.isLoggable(Level.INFO)) {
log.log(Level.INFO, LogFacade.MANAGER_STARTED_INFO);
}
return;
}
if( ! initialized )
init();
lifecycle.fireLifecycleEvent(START_EVENT, null);
started = true;
// Force initialization of the random number generator
if (log.isLoggable(Level.FINEST))
log.log(Level.FINEST, "Force random number initialization starting");
generateSessionId();
if (log.isLoggable(Level.FINEST))
log.log(Level.FINEST, "Force random number initialization completed");
if (store == null)
log.log(Level.SEVERE, LogFacade.NO_STORE_CONFIG_EXCEPTION);
else if (store instanceof Lifecycle)
((Lifecycle)store).start();
}
/**
* 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.isLoggable(Level.FINE))
log.log(Level.FINE, "Stopping");
// Validate and update our current component state
if (!isStarted()) {
if (log.isLoggable(Level.INFO)) {
log.log(Level.INFO,LogFacade. MANAGER_NOT_STARTED_INFO);
}
return;
}
lifecycle.fireLifecycleEvent(STOP_EVENT, null);
setStarted(false);
if (getStore() != null && saveOnRestart) {
unload();
} else {
// Expire all active sessions
Session sessions[] = findSessions();
for (int i = 0; i < sessions.length; i++) {
StandardSession session = (StandardSession) sessions[i];
if (!session.isValid())
continue;
session.expire();
}
}
if (getStore() != null && getStore() instanceof Lifecycle)
((Lifecycle)getStore()).stop();
// Require a new random number generator if we are restarted
resetRandom();
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 {
setMaxInactiveIntervalSeconds
( ((Integer) event.getNewValue()).intValue()*60 );
} catch (NumberFormatException e) {
log.log(Level.SEVERE, LogFacade.INVALID_SESSION_TIMEOUT_SETTING_EXCEPTION, event.getNewValue().toString());
}
}
}
// -------------------------------------------------------- Private Methods
/**
* Swap idle sessions out to Store if they are idle too long.
*/
protected void processMaxIdleSwaps() {
if (!isStarted() || maxIdleSwap < 0)
return;
Session sessions[] = findSessions();
long timeNow = System.currentTimeMillis();
// Swap out all sessions idle longer than maxIdleSwap
// FIXME: What's preventing us from mangling a session during
// a request?
if (maxIdleSwap >= 0) {
for (int i = 0; i < sessions.length; i++) {
StandardSession session = (StandardSession) sessions[i];
if (!session.isValid())
continue;
int timeIdle = // Truncate, do not round up
(int) ((timeNow - session.getLastAccessedTime()) / 1000L);
if (timeIdle > maxIdleSwap && timeIdle > minIdleSwap) {
if (log.isLoggable(Level.FINE)) {
log.log(Level.FINE, LogFacade.SWAPPING_SESSION_TO_STORE, new Object[] {session.getIdInternal(),
Integer.valueOf(timeIdle)});
}
try {
swapOut(session);
} catch (IOException e) {
// This is logged in writeSession()
}
}
}
}
}
/**
* Swap idle sessions out to Store if too many are active
* Hercules: modified method
*/
protected void processMaxActiveSwaps() {
if (!isStarted() || getMaxActiveSessions() < 0)
return;
Session sessions[] = findSessions();
// FIXME: Smarter algorithm (LRU)
if (getMaxActiveSessions() >= sessions.length)
return;
if(log.isLoggable(Level.FINE)) {
log.log(Level.FINE, LogFacade.TOO_MANY_ACTIVE_SESSION, Integer.valueOf(sessions.length));
}
int toswap = sessions.length - getMaxActiveSessions();
long timeNow = System.currentTimeMillis();
for (int i = 0; i < sessions.length && toswap > 0; i++) {
int timeIdle = // Truncate, do not round up
(int) ((timeNow - sessions[i].getLastAccessedTime()) / 1000L);
if (timeIdle > minIdleSwap) {
StandardSession session = (StandardSession) sessions[i];
//skip the session if it cannot be locked
if(session.lockBackground()) {
if(log.isLoggable(Level.FINE)) {
log.log(Level.FINE, LogFacade.SWAP_OUT_SESSION, new Object[] {session.getIdInternal(),
Integer.valueOf(timeIdle)});
}
try {
swapOut(session);
} catch (java.util.ConcurrentModificationException e1) {
// This is logged in writeSession()
} catch (IOException e) {
// This is logged in writeSession()
} catch (Exception e) {
// This is logged in writeSession()
} finally {
session.unlockBackground();
}
toswap--;
}
}
}
}
/**
* Back up idle sessions.
* Hercules: modified method
*/
protected void processMaxIdleBackups() {
if (!isStarted() || maxIdleBackup < 0)
return;
Session sessions[] = findSessions();
long timeNow = System.currentTimeMillis();
// Back up all sessions idle longer than maxIdleBackup
if (maxIdleBackup >= 0) {
for (int i = 0; i < sessions.length; i++) {
StandardSession session = (StandardSession) sessions[i];
if (!session.isValid())
continue;
int timeIdle = // Truncate, do not round up
(int) ((timeNow - session.getLastAccessedTime()) / 1000L);
if (timeIdle > maxIdleBackup) {
//if session cannot be background locked then skip it
if (session.lockBackground()) {
if (log.isLoggable(Level.FINE)) {
log.log(Level.FINE, LogFacade.BACKUP_SESSION_TO_STORE, new Object[] {session.getIdInternal(),
Integer.valueOf(timeIdle)});
}
try {
writeSession(session);
} catch (java.util.ConcurrentModificationException e1) {
// This is logged in writeSession()
} catch (IOException e) {
// This is logged in writeSession()
} catch (Exception e) {
// This is logged in writeSession()
} finally {
session.unlockBackground();
}
}
}
}
}
}
public String getMonitorAttributeValues() {
//FIXME if desired for monitoring 'file'
return "";
}
}