org.apache.catalina.session.StandardManager Maven / Gradle / Ivy
/*
* 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.session;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletContext;
import org.apache.catalina.Context;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleState;
import org.apache.catalina.Loader;
import org.apache.catalina.Session;
import org.apache.catalina.security.SecurityUtil;
import org.apache.catalina.util.CustomObjectInputStream;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.ExceptionUtils;
/**
* Standard implementation of the Manager interface that provides simple session persistence across restarts of
* this component (such as when the entire server is shut down and restarted, or when a particular web application is
* reloaded.
*
* 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
*/
public class StandardManager extends ManagerBase {
private final Log log = LogFactory.getLog(StandardManager.class); // must not be static
// ---------------------------------------------------- Security Classes
private class PrivilegedDoLoad implements PrivilegedExceptionAction {
PrivilegedDoLoad() {
// NOOP
}
@Override
public Void run() throws Exception {
doLoad();
return null;
}
}
private class PrivilegedDoUnload implements PrivilegedExceptionAction {
PrivilegedDoUnload() {
// NOOP
}
@Override
public Void run() throws Exception {
doUnload();
return null;
}
}
// ----------------------------------------------------- Instance Variables
/**
* The descriptive name of this Manager implementation (for logging).
*/
protected static final String name = "StandardManager";
/**
* Path name of the disk file in which active sessions are saved when we stop, and from which these sessions are
* loaded when we start. A null value indicates that no persistence is desired. If this pathname is
* relative, it will be resolved against the temporary working directory provided by our context, available via the
* javax.servlet.context.tempdir context attribute.
*/
protected String pathname = "SESSIONS.ser";
// ------------------------------------------------------------- Properties
@Override
public String getName() {
return name;
}
/**
* @return The session persistence pathname, if any.
*/
public String getPathname() {
return pathname;
}
/**
* Set the session persistence pathname to the specified value. If no persistence support is desired, set the
* pathname to null.
*
* @param pathname New session persistence pathname
*/
public void setPathname(String pathname) {
String oldPathname = this.pathname;
this.pathname = pathname;
support.firePropertyChange("pathname", oldPathname, this.pathname);
}
// --------------------------------------------------------- Public Methods
@Override
public void load() throws ClassNotFoundException, IOException {
if (SecurityUtil.isPackageProtectionEnabled()) {
try {
AccessController.doPrivileged(new PrivilegedDoLoad());
} catch (PrivilegedActionException ex) {
Exception exception = ex.getException();
if (exception instanceof ClassNotFoundException) {
throw (ClassNotFoundException) exception;
} else if (exception instanceof IOException) {
throw (IOException) exception;
}
if (log.isDebugEnabled()) {
log.debug("Unreported exception in load() ", exception);
}
}
} else {
doLoad();
}
}
/**
* Load any currently active sessions that were previously unloaded to the appropriate persistence mechanism, if
* any. If persistence is not supported, this method returns without doing anything.
*
* @exception ClassNotFoundException if a serialized class cannot be found during the reload
* @exception IOException if an input/output error occurs
*/
protected void doLoad() throws ClassNotFoundException, IOException {
if (log.isTraceEnabled()) {
log.trace("Start: Loading persisted sessions");
}
// Initialize our internal data structures
sessions.clear();
// Open an input stream to the specified pathname, if any
File file = file();
if (file == null) {
return;
}
if (log.isTraceEnabled()) {
log.trace(sm.getString("standardManager.loading", pathname));
}
Loader loader = null;
ClassLoader classLoader = null;
Log logger = null;
try (FileInputStream fis = new FileInputStream(file.getAbsolutePath());
BufferedInputStream bis = new BufferedInputStream(fis)) {
Context c = getContext();
loader = c.getLoader();
logger = c.getLogger();
if (loader != null) {
classLoader = loader.getClassLoader();
}
if (classLoader == null) {
classLoader = getClass().getClassLoader();
}
// Load the previously unloaded active sessions
synchronized (sessions) {
try (ObjectInputStream ois = new CustomObjectInputStream(bis, classLoader, logger,
getSessionAttributeValueClassNamePattern(), getWarnOnSessionAttributeFilterFailure())) {
Integer count = (Integer) ois.readObject();
int n = count.intValue();
if (log.isTraceEnabled()) {
log.trace("Loading " + n + " persisted sessions");
}
for (int i = 0; i < n; i++) {
StandardSession session = getNewSession();
session.readObjectData(ois);
session.setManager(this);
sessions.put(session.getIdInternal(), session);
session.activate();
if (!session.isValidInternal()) {
// If session is already invalid,
// expire session to prevent memory leak.
session.setValid(true);
session.expire();
}
}
} finally {
// Delete the persistent storage file
if (file.exists()) {
if (!file.delete()) {
log.warn(sm.getString("standardManager.deletePersistedFileFail", file));
}
}
}
}
} catch (FileNotFoundException e) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("standardManager.noFile", file.getAbsolutePath()));
}
return;
}
if (log.isTraceEnabled()) {
log.trace("Finish: Loading persisted sessions");
}
}
@Override
public void unload() throws IOException {
if (SecurityUtil.isPackageProtectionEnabled()) {
try {
AccessController.doPrivileged(new PrivilegedDoUnload());
} catch (PrivilegedActionException ex) {
Exception exception = ex.getException();
if (exception instanceof IOException) {
throw (IOException) exception;
}
if (log.isDebugEnabled()) {
log.debug("Unreported exception in unLoad()", exception);
}
}
} else {
doUnload();
}
}
/**
* 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 void doUnload() throws IOException {
if (log.isTraceEnabled()) {
log.trace(sm.getString("standardManager.unloading.debug"));
}
if (sessions.isEmpty()) {
log.debug(sm.getString("standardManager.unloading.nosessions"));
return; // nothing to do
}
// Open an output stream to the specified pathname, if any
File file = file();
if (file == null) {
return;
}
if (log.isTraceEnabled()) {
log.trace(sm.getString("standardManager.unloading", pathname));
}
// Keep a note of sessions that are expired
List list = new ArrayList<>();
try (FileOutputStream fos = new FileOutputStream(file.getAbsolutePath());
BufferedOutputStream bos = new BufferedOutputStream(fos);
ObjectOutputStream oos = new ObjectOutputStream(bos)) {
synchronized (sessions) {
if (log.isTraceEnabled()) {
log.trace("Unloading " + sessions.size() + " sessions");
}
// Write the number of active sessions, followed by the details
oos.writeObject(Integer.valueOf(sessions.size()));
for (Session s : sessions.values()) {
StandardSession session = (StandardSession) s;
list.add(session);
session.passivate();
session.writeObjectData(oos);
}
}
}
// Expire all the sessions we just wrote
if (log.isDebugEnabled()) {
log.debug(sm.getString("standardManager.expiringSessions", Integer.toString(list.size())));
}
for (StandardSession session : list) {
try {
session.expire(false);
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
} finally {
session.recycle();
}
}
if (log.isTraceEnabled()) {
log.trace("Unloading complete");
}
}
/**
* Start this component and implement the requirements of
* {@link org.apache.catalina.util.LifecycleBase#startInternal()}.
*
* @exception LifecycleException if this component detects a fatal error that prevents this component from being
* used
*/
@Override
protected void startInternal() throws LifecycleException {
super.startInternal();
// Load unloaded sessions, if any
try {
load();
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error(sm.getString("standardManager.managerLoad"), t);
}
setState(LifecycleState.STARTING);
}
/**
* Stop this component and implement the requirements of
* {@link org.apache.catalina.util.LifecycleBase#stopInternal()}.
*
* @exception LifecycleException if this component detects a fatal error that prevents this component from being
* used
*/
@Override
protected void stopInternal() throws LifecycleException {
if (log.isTraceEnabled()) {
log.trace("Stopping");
}
setState(LifecycleState.STOPPING);
// Write out sessions
try {
unload();
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error(sm.getString("standardManager.managerUnload"), t);
}
// Expire all active sessions
Session sessions[] = findSessions();
for (Session session : sessions) {
try {
if (session.isValid()) {
session.expire();
}
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
} finally {
// Measure against memory leaking if references to the session
// object are kept in a shared field somewhere
session.recycle();
}
}
// Require a new random number generator if we are restarted
super.stopInternal();
}
// ------------------------------------------------------ Protected Methods
/**
* Return a File object representing the pathname to our persistence file, if any.
*
* @return the file
*/
protected File file() {
if (pathname == null || pathname.length() == 0) {
return null;
}
File file = new File(pathname);
if (!file.isAbsolute()) {
Context context = getContext();
ServletContext servletContext = context.getServletContext();
File tempdir = (File) servletContext.getAttribute(ServletContext.TEMPDIR);
if (tempdir != null) {
file = new File(tempdir, pathname);
}
}
return file;
}
}