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* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
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package org.apache.catalina.session;
import org.apache.catalina.*;
import org.apache.catalina.util.LifecycleSupport;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.List;
import java.util.ResourceBundle;
import java.util.logging.Level;
//HERCULES:end added
/**
* Abstract implementation of the Store interface to
* support most of the functionality required by a Store.
*
* @author Bip Thelin
* @version $Revision: 1.8 $, $Date: 2007/05/05 05:32:19 $
*/
public abstract class StoreBase
implements Lifecycle, Store {
private static final java.util.logging.Logger log = LogFacade.getLogger();
private static final ResourceBundle rb = log.getResourceBundle();
// ----------------------------------------------------- Instance Variables
/**
* The descriptive information about this implementation.
*/
/* SJSAS
protected static String info = "StoreBase/1.0";
*/
// START SJSAS
// If this variable were static, it would need to be protected from
// manipulation by malicious code by making it final. However, this
// variable must not be final, because it is assigned a different value
// in some of the EE subclasses. Therefore, turning it into an instance
// variable.
protected String info = "StoreBase/1.0";
// END SJSAS
/**
* Name to register for this Store, used for logging.
*/
/* SJSAS
protected static String storeName = "StoreBase";
*/
// START SJSAS
// If this variable were static, it would need to be protected from
// manipulation by malicious code by making it final. However, this
// variable must not be final, because it is assigned a different value
// in some of the EE subclasses. Therefore, turning it into an instance
// variable.
protected String storeName = "StoreBase";
// END SJSAS
/**
* The debugging detail level for this component.
*/
protected int debug = 0;
/**
* Has this component been started yet?
*/
protected boolean started = false;
/**
* The lifecycle event support for this component.
*/
protected LifecycleSupport lifecycle = new LifecycleSupport(this);
/**
* The property change support for this component.
*/
protected PropertyChangeSupport support = new PropertyChangeSupport(this);
/**
* The Manager with which this JDBCStore is associated.
*/
protected Manager manager;
// ------------------------------------------------------------- Properties
/**
* Return the info for this Store.
*/
public String getInfo() {
return(info);
}
/**
* Return the name for this Store, used for logging.
*/
public String getStoreName() {
return(storeName);
}
/**
* Set the debugging detail level for this Store.
*
* @param debug The new debugging detail level
*/
public void setDebug(int debug) {
this.debug = debug;
}
/**
* Return the debugging detail level for this Store.
*/
public int getDebug() {
return(this.debug);
}
/**
* Set the Manager with which this Store is associated.
*
* @param manager The newly associated Manager
*/
public void setManager(Manager manager) {
Manager oldManager = this.manager;
this.manager = manager;
support.firePropertyChange("manager", oldManager, this.manager);
}
/**
* Return the Manager with which the Store is associated.
*/
public Manager getManager() {
return(this.manager);
}
// --------------------------------------------------------- Public 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 Store.
*/
public List findLifecycleListeners() {
return lifecycle.findLifecycleListeners();
}
/**
* Remove a lifecycle event listener from this component.
*
* @param listener The listener to add
*/
public void removeLifecycleListener(LifecycleListener listener) {
lifecycle.removeLifecycleListener(listener);
}
/**
* Add a property change listener to this component.
*
* @param listener a value of type 'PropertyChangeListener'
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
support.addPropertyChangeListener(listener);
}
/**
* Remove a property change listener from this component.
*
* @param listener The listener to remove
*/
public void removePropertyChangeListener(PropertyChangeListener listener) {
support.removePropertyChangeListener(listener);
}
/**
* Serialize a session into an output stream.
*
* @param sess
* The session to be serialized
*
* @param oos
* The output stream the session should be written to
* Hercules: added method
*/
public void writeSession(Session sess, ObjectOutputStream oos)
throws IOException {
if ( sess == null ) {
return;
}
oos.writeObject(sess);
}
/**
* Create a session object from an input stream.
*
* @param manager
* The manager that will own this session
*
* @param ois
* The input stream containing the serialized session
*
* @return
* The resulting session object
* Hercules: added method
*/
public Session readSession(Manager manager, ObjectInputStream ois)
throws ClassNotFoundException, IOException {
StandardSession sess = StandardSession.deserialize(ois, manager);
sess.setManager(manager);
return sess;
}
/**
* public wrapper for processExpires()
* don't want to make processExpires() public
* called from manager background thread
*
* Hercules: added method
*/
public void doProcessExpires() {
this.processExpires();
}
/**
* no-op method - sub classes will
* implement to remove a session from the store
* cache
* Hercules: added method
*/
public void removeFromStoreCache(String id) {
//do nothing
}
// ----------------------------------------------------- Protected Methods
/**
* Called by our background reaper thread to check if Sessions
* saved in our store are subject of being expired. If so expire
* the Session and remove it from the Store.
*/
public void processExpires() {
long timeNow = System.currentTimeMillis();
String[] keys = null;
if(!started) {
return;
}
try {
keys = keys();
} catch (IOException e) {
log("Error during processExpires", e);
return;
}
for (int i = 0; i < keys.length; i++) {
try {
StandardSession session = (StandardSession) load(keys[i]);
if (session == null) {
continue;
}
int timeIdle = (int) ((timeNow - session.thisAccessedTime) / 1000L);
if (timeIdle < session.getMaxInactiveInterval()) {
continue;
}
if ( ( (PersistentManagerBase) manager).isLoaded( keys[i] )) {
// recycle old backup session
session.recycle();
} else {
// expire swapped out session
session.expire();
}
remove(keys[i]);
} catch (IOException e) {
log("Error during processExpires", e);
} catch (ClassNotFoundException e) {
log("Error during processExpires", e);
}
}
}
/**
* Log a message on the Logger associated with our Container (if any).
*
* @param message Message to be logged
*/
protected void log(String message) {
Logger logger = null;
String containerName = null;
Container container = manager.getContainer();
if (container != null) {
logger = container.getLogger();
containerName = container.getName();
}
if (logger != null) {
logger.log(getStoreName()+"[" + containerName + "]: " +
message);
} else {
log.log(Level.FINE, getStoreName() + "[" + containerName + "]: " + message);
}
}
/**
* Logs the given message to the Logger associated with the Container
* (if any) of this StoreBase.
*
* @param message the message
* @param t the Throwable
*/
private void log(String message, Throwable t) {
Logger logger = null;
String containerName = null;
Container container = manager.getContainer();
if (container != null) {
logger = container.getLogger();
containerName = container.getName();
}
if (logger != null) {
logger.log(getStoreName()+"[" + containerName + "]: " +
message, t, Logger.WARNING);
} else {
log.log(Level.WARNING, getStoreName()+"[" + containerName + "]: " + message, t);
}
}
/**
* Load and return the Session associated with the specified session
* identifier from this Store, without removing it. If there is no
* such stored Session, return null.
*
* @param id Session identifier of the session to load
* @param version The requested session version
*
* @exception ClassNotFoundException if a deserialization error occurs
* @exception IOException if an input/output error occurs
*/
public Session load(String id, String version)
throws ClassNotFoundException, IOException {
return load(id);
}
// --------------------------------------------------------- Thread Methods
/**
* 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)
throw new LifecycleException
(rb.getString(LogFacade.STORE_BASE_STARTED_EXCEPTION));
lifecycle.fireLifecycleEvent(START_EVENT, null);
started = true;
}
/**
* 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 {
// Validate and update our current component state
if (!started)
throw new LifecycleException
(rb.getString(LogFacade.STORE_BASE_NOT_STARTED_EXCEPTION));
lifecycle.fireLifecycleEvent(STOP_EVENT, null);
started = false;
}
}