/*
* $Header: /home/cvs/jakarta-tomcat-4.0/catalina/src/share/org/apache/catalina/session/ManagerBase.java,v 1.17 2003/01/01 06:24:26 billbarker Exp $
* $Revision: 1.17 $
* $Date: 2003/01/01 06:24:26 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
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*
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*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.catalina.session;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Random;
import org.apache.catalina.Container;
import org.apache.catalina.DefaultContext;
import org.apache.catalina.Engine;
import org.apache.catalina.Logger;
import org.apache.catalina.Manager;
import org.apache.catalina.Session;
import org.apache.catalina.util.StringManager;
/**
* Minimal implementation of the <b>Manager</b> interface that supports
* no session persistence or distributable capabilities. This class may
* be subclassed to create more sophisticated Manager implementations.
*
* @author Craig R. McClanahan
* @version $Revision: 1.17 $ $Date: 2003/01/01 06:24:26 $
*/
public abstract class ManagerBase implements Manager {
// ----------------------------------------------------- Instance Variables
/**
* The default message digest algorithm to use if we cannot use
* the requested one.
*/
protected static final String DEFAULT_ALGORITHM = "MD5";
/**
* The number of random bytes to include when generating a
* session identifier.
*/
protected static final int SESSION_ID_BYTES = 16;
/**
* The message digest algorithm to be used when generating session
* identifiers. This must be an algorithm supported by the
* <code>java.security.MessageDigest</code> class on your platform.
*/
protected String algorithm = DEFAULT_ALGORITHM;
/**
* The Container with which this Manager is associated.
*/
protected Container container;
/**
* The debugging detail level for this component.
*/
protected int debug = 0;
/**
* The DefaultContext with which this Manager is associated.
*/
protected DefaultContext defaultContext = null;
/**
* Return the MessageDigest implementation to be used when
* creating session identifiers.
*/
protected MessageDigest digest = null;
/**
* The distributable flag for Sessions created by this Manager. If this
* flag is set to <code>true</code>, any user attributes added to a
* session controlled by this Manager must be Serializable.
*/
protected boolean distributable;
/**
* A String initialization parameter used to increase the entropy of
* the initialization of our random number generator.
*/
protected String entropy = null;
/**
* The descriptive information string for this implementation.
*/
private static final String info = "ManagerBase/1.0";
/**
* The default maximum inactive interval for Sessions created by
* this Manager.
*/
protected int maxInactiveInterval = 60;
/**
* The descriptive name of this Manager implementation (for logging).
*/
protected static String name = "ManagerBase";
/**
* A random number generator to use when generating session identifiers.
*/
protected Random random = null;
/**
* The Java class name of the random number generator class to be used
* when generating session identifiers.
*/
protected String randomClass = "java.security.SecureRandom";
/**
* The set of previously recycled Sessions for this Manager.
*/
protected ArrayList recycled = new ArrayList();
/**
* The set of currently active Sessions for this Manager, keyed by
* session identifier.
*/
protected HashMap sessions = new HashMap();
/**
* The string manager for this package.
*/
protected static StringManager sm =
StringManager.getManager(Constants.Package);
/**
* The property change support for this component.
*/
protected PropertyChangeSupport support = new PropertyChangeSupport(this);
// ------------------------------------------------------------- Properties
/**
* Return the message digest algorithm for this Manager.
*/
public String getAlgorithm() {
return (this.algorithm);
}
/**
* Set the message digest algorithm for this Manager.
*
* @param algorithm The new message digest algorithm
*/
public void setAlgorithm(String algorithm) {
String oldAlgorithm = this.algorithm;
this.algorithm = algorithm;
support.firePropertyChange("algorithm", oldAlgorithm, this.algorithm);
}
/**
* Return the Container with which this Manager is associated.
*/
public Container getContainer() {
return (this.container);
}
/**
* Set the Container with which this Manager is associated.
*
* @param container The newly associated Container
*/
public void setContainer(Container container) {
Container oldContainer = this.container;
this.container = container;
support.firePropertyChange("container", oldContainer, this.container);
}
/**
* Return the DefaultContext with which this Manager is associated.
*/
public DefaultContext getDefaultContext() {
return (this.defaultContext);
}
/**
* Set the DefaultContext with which this Manager is associated.
*
* @param defaultContext The newly associated DefaultContext
*/
public void setDefaultContext(DefaultContext defaultContext) {
DefaultContext oldDefaultContext = this.defaultContext;
this.defaultContext = defaultContext;
support.firePropertyChange("defaultContext", oldDefaultContext, this.defaultContext);
}
/**
* Return the debugging detail level for this component.
*/
public int getDebug() {
return (this.debug);
}
/**
* Set the debugging detail level for this component.
*
* @param debug The new debugging detail level
*/
public void setDebug(int debug) {
this.debug = debug;
}
/**
* Return the MessageDigest object to be used for calculating
* session identifiers. If none has been created yet, initialize
* one the first time this method is called.
*/
public synchronized MessageDigest getDigest() {
if (this.digest == null) {
if (debug >= 1)
log(sm.getString("managerBase.getting", algorithm));
try {
this.digest = MessageDigest.getInstance(algorithm);
} catch (NoSuchAlgorithmException e) {
log(sm.getString("managerBase.digest", algorithm), e);
try {
this.digest = MessageDigest.getInstance(DEFAULT_ALGORITHM);
} catch (NoSuchAlgorithmException f) {
log(sm.getString("managerBase.digest",
DEFAULT_ALGORITHM), e);
this.digest = null;
}
}
if (debug >= 1)
log(sm.getString("managerBase.gotten"));
}
return (this.digest);
}
/**
* Return the distributable flag for the sessions supported by
* this Manager.
*/
public boolean getDistributable() {
return (this.distributable);
}
/**
* Set the distributable flag for the sessions supported by this
* Manager. If this flag is set, all user data objects added to
* sessions associated with this manager must implement Serializable.
*
* @param distributable The new distributable flag
*/
public void setDistributable(boolean distributable) {
boolean oldDistributable = this.distributable;
this.distributable = distributable;
support.firePropertyChange("distributable",
new Boolean(oldDistributable),
new Boolean(this.distributable));
}
/**
* Return the entropy increaser value, or compute a semi-useful value
* if this String has not yet been set.
*/
public String getEntropy() {
// Calculate a semi-useful value if this has not been set
if (this.entropy == null)
setEntropy(this.toString());
return (this.entropy);
}
/**
* Set the entropy increaser value.
*
* @param entropy The new entropy increaser value
*/
public void setEntropy(String entropy) {
String oldEntropy = entropy;
this.entropy = entropy;
support.firePropertyChange("entropy", oldEntropy, this.entropy);
}
/**
* Return descriptive information about this Manager implementation and
* the corresponding version number, in the format
* <code><description>/<version></code>.
*/
public String getInfo() {
return (this.info);
}
/**
* Return the default maximum inactive interval (in seconds)
* for Sessions created by this Manager.
*/
public int getMaxInactiveInterval() {
return (this.maxInactiveInterval);
}
/**
* Set the default maximum inactive interval (in seconds)
* for Sessions created by this Manager.
*
* @param interval The new default value
*/
public void setMaxInactiveInterval(int interval) {
int oldMaxInactiveInterval = this.maxInactiveInterval;
this.maxInactiveInterval = interval;
support.firePropertyChange("maxInactiveInterval",
new Integer(oldMaxInactiveInterval),
new Integer(this.maxInactiveInterval));
}
/**
* Return the descriptive short name of this Manager implementation.
*/
public String getName() {
return (name);
}
/**
* Return the random number generator instance we should use for
* generating session identifiers. If there is no such generator
* currently defined, construct and seed a new one.
*/
public synchronized Random getRandom() {
if (this.random == null) {
synchronized (this) {
if (this.random == null) {
// Calculate the new random number generator seed
log(sm.getString("managerBase.seeding", randomClass));
long seed = System.currentTimeMillis();
char entropy[] = getEntropy().toCharArray();
for (int i = 0; i < entropy.length; i++) {
long update = ((byte) entropy[i]) << ((i % 8) * 8);
seed ^= update;
}
try {
// Construct and seed a new random number generator
Class clazz = Class.forName(randomClass);
this.random = (Random) clazz.newInstance();
this.random.setSeed(seed);
} catch (Exception e) {
// Fall back to the simple case
log(sm.getString("managerBase.random", randomClass),
e);
this.random = new java.util.Random();
this.random.setSeed(seed);
}
log(sm.getString("managerBase.complete", randomClass));
}
}
}
return (this.random);
}
/**
* Return the random number generator class name.
*/
public String getRandomClass() {
return (this.randomClass);
}
/**
* Set the random number generator class name.
*
* @param randomClass The new random number generator class name
*/
public void setRandomClass(String randomClass) {
String oldRandomClass = this.randomClass;
this.randomClass = randomClass;
support.firePropertyChange("randomClass", oldRandomClass,
this.randomClass);
}
// --------------------------------------------------------- Public Methods
/**
* Add this Session to the set of active Sessions for this Manager.
*
* @param session Session to be added
*/
public void add(Session session) {
synchronized (sessions) {
sessions.put(session.getId(), session);
}
}
/**
* Add a property change listener to this component.
*
* @param listener The listener to add
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
support.addPropertyChangeListener(listener);
}
/**
* 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</code>.
*
* @exception IllegalStateException if a new session cannot be
* instantiated for any reason
*/
public Session createSession() {
// Recycle or create a Session instance
Session session = null;
synchronized (recycled) {
int size = recycled.size();
if (size > 0) {
session = (Session) recycled.get(size - 1);
recycled.remove(size - 1);
}
}
if (session != null)
session.setManager(this);
else
session = new StandardSession(this);
// Initialize the properties of the new session and return it
session.setNew(true);
session.setValid(true);
session.setCreationTime(System.currentTimeMillis());
session.setMaxInactiveInterval(this.maxInactiveInterval);
String sessionId = generateSessionId();
String jvmRoute = getJvmRoute();
// @todo Move appending of jvmRoute generateSessionId()???
if (jvmRoute != null) {
sessionId += '.' + jvmRoute;
}
synchronized (sessions) {
while (sessions.get(sessionId) != null){ // Guarantee uniqueness
sessionId = generateSessionId();
// @todo Move appending of jvmRoute generateSessionId()???
if (jvmRoute != null) {
sessionId += '.' + jvmRoute;
}
}
}
session.setId(sessionId);
return (session);
}
/**
* Return the active Session, associated with this Manager, with the
* specified session id (if any); otherwise return <code>null</code>.
*
* @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 {
if (id == null)
return (null);
synchronized (sessions) {
Session session = (Session) sessions.get(id);
return (session);
}
}
/**
* Return the set of active Sessions associated with this Manager.
* If this Manager has no active Sessions, a zero-length array is returned.
*/
public Session[] findSessions() {
Session results[] = null;
synchronized (sessions) {
results = new Session[sessions.size()];
results = (Session[]) sessions.values().toArray(results);
}
return (results);
}
/**
* Remove this Session from the active Sessions for this Manager.
*
* @param session Session to be removed
*/
public void remove(Session session) {
synchronized (sessions) {
sessions.remove(session.getId());
}
}
/**
* Remove a property change listener from this component.
*
* @param listener The listener to remove
*/
public void removePropertyChangeListener(PropertyChangeListener listener) {
support.removePropertyChangeListener(listener);
}
// ------------------------------------------------------ Protected Methods
/**
* Generate and return a new session identifier.
*/
protected synchronized String generateSessionId() {
// Generate a byte array containing a session identifier
Random random = getRandom();
byte bytes[] = new byte[SESSION_ID_BYTES];
getRandom().nextBytes(bytes);
bytes = getDigest().digest(bytes);
// Render the result as a String of hexadecimal digits
StringBuffer result = new StringBuffer();
for (int i = 0; i < bytes.length; i++) {
byte b1 = (byte) ((bytes[i] & 0xf0) >> 4);
byte b2 = (byte) (bytes[i] & 0x0f);
if (b1 < 10)
result.append((char) ('0' + b1));
else
result.append((char) ('A' + (b1 - 10)));
if (b2 < 10)
result.append((char) ('0' + b2));
else
result.append((char) ('A' + (b2 - 10)));
}
return (result.toString());
}
// ------------------------------------------------------ Protected Methods
/**
* Retrieve the enclosing Engine for this Manager.
*
* @return an Engine object (or null).
*/
public Engine getEngine() {
Engine e = null;
for (Container c = getContainer(); e == null && c != null ; c = c.getParent()) {
if (c != null && c instanceof Engine) {
e = (Engine)c;
}
}
return e;
}
/**
* Retrieve the JvmRoute for the enclosing Engine.
* @return the JvmRoute or null.
*/
public String getJvmRoute() {
Engine e = getEngine();
return e == null ? null : e.getJvmRoute();
}
// -------------------------------------------------------- Package Methods
/**
* Log a message on the Logger associated with our Container (if any).
*
* @param message Message to be logged
*/
void log(String message) {
Logger logger = null;
if (container != null)
logger = container.getLogger();
if (logger != null)
logger.log(getName() + "[" + container.getName() + "]: "
+ message);
else {
String containerName = null;
if (container != null)
containerName = container.getName();
System.out.println(getName() + "[" + containerName
+ "]: " + message);
}
}
/**
* Log a message on the Logger associated with our Container (if any).
*
* @param message Message to be logged
* @param throwable Associated exception
*/
void log(String message, Throwable throwable) {
Logger logger = null;
if (container != null)
logger = container.getLogger();
if (logger != null)
logger.log(getName() + "[" + container.getName() + "] "
+ message, throwable);
else {
String containerName = null;
if (container != null)
containerName = container.getName();
System.out.println(getName() + "[" + containerName
+ "]: " + message);
throwable.printStackTrace(System.out);
}
}
/**
* Add this Session to the recycle collection for this Manager.
*
* @param session Session to be recycled
*/
void recycle(Session session) {
synchronized (recycled) {
recycled.add(session);
}
}
}