/*
* 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.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleState;
import org.apache.catalina.Manager;
import org.apache.catalina.Store;
import org.apache.catalina.util.CustomObjectInputStream;
import org.apache.catalina.util.LifecycleBase;
import org.apache.tomcat.util.res.StringManager;
/**
* Abstract implementation of the {@link Store} interface to
* support most of the functionality required by a {@link Store}.
*
* @author Bip Thelin
*/
public abstract class StoreBase extends LifecycleBase implements Store {
// ----------------------------------------------------- Instance Variables
/**
* The descriptive information about this implementation.
*/
protected static final String info = "StoreBase/1.0";
/**
* Name to register for this Store, used for logging.
*/
protected static String storeName = "StoreBase";
/**
* The property change support for this component.
*/
protected PropertyChangeSupport support = new PropertyChangeSupport(this);
/**
* The string manager for this package.
*/
protected static final StringManager sm = StringManager.getManager(StoreBase.class);
/**
* The Manager with which this Store is associated.
*/
protected Manager manager;
// ------------------------------------------------------------- Properties
/**
* @return the info for this Store.
*/
@Override
public String getInfo() {
return info;
}
/**
* @return the name for this Store, used for logging.
*/
public String getStoreName() {
return storeName;
}
/**
* Set the Manager with which this Store is associated.
*
* @param manager The newly associated Manager
*/
@Override
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.
*/
@Override
public Manager getManager() {
return this.manager;
}
// --------------------------------------------------------- Public Methods
/**
* Add a property change listener to this component.
*
* @param listener a value of type {@link PropertyChangeListener}
*/
@Override
public void addPropertyChangeListener(PropertyChangeListener listener) {
support.addPropertyChangeListener(listener);
}
/**
* Remove a property change listener from this component.
*
* @param listener The listener to remove
*/
@Override
public void removePropertyChangeListener(PropertyChangeListener listener) {
support.removePropertyChangeListener(listener);
}
/**
* Get only those keys of sessions, that are saved in the Store and are to
* be expired.
*
* @return list of session keys, that are to be expired
* @throws IOException
* if an input-/output error occurred
*/
public String[] expiredKeys() throws IOException {
return keys();
}
/**
* 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() {
String[] keys = null;
if(!getState().isAvailable()) {
return;
}
try {
keys = expiredKeys();
} catch (IOException e) {
manager.getContainer().getLogger().error("Error getting keys", e);
return;
}
if (manager.getContainer().getLogger().isDebugEnabled()) {
manager.getContainer().getLogger().debug(getStoreName()+ ": processExpires check number of " + keys.length + " sessions" );
}
long timeNow = System.currentTimeMillis();
for (int i = 0; i < keys.length; i++) {
try {
StandardSession session = (StandardSession) load(keys[i]);
if (session == null) {
continue;
}
int timeIdle = (int) ((timeNow - session.getThisAccessedTime()) / 1000L);
if (timeIdle < session.getMaxInactiveInterval()) {
continue;
}
if (manager.getContainer().getLogger().isDebugEnabled()) {
manager.getContainer().getLogger().debug(getStoreName()+ ": processExpires expire store session " + keys[i] );
}
boolean isLoaded = false;
if (manager instanceof PersistentManagerBase) {
isLoaded = ((PersistentManagerBase) manager).isLoaded(keys[i]);
} else {
try {
if (manager.findSession(keys[i]) != null) {
isLoaded = true;
}
} catch (IOException ioe) {
// Ignore - session will be expired
}
}
if (isLoaded) {
// recycle old backup session
session.recycle();
} else {
// expire swapped out session
session.expire();
}
remove(keys[i]);
} catch (Exception e) {
manager.getContainer().getLogger().error("Session: "+keys[i]+"; ", e);
try {
remove(keys[i]);
} catch (IOException e2) {
manager.getContainer().getLogger().error("Error removing key", e2);
}
}
}
}
// --------------------------------------------------------- Protected Methods
/**
* Create the object input stream to use to read a session from the store.
* Sub-classes <b>must</b> have set the thread context class loader before
* calling this method.
*
* @param is The input stream provided by the sub-class that will provide
* the data for a session
*
* @return An appropriately configured ObjectInputStream from which the
* session can be read.
*
* @throws IOException if a problem occurs creating the ObjectInputStream
*/
protected ObjectInputStream getObjectInputStream(InputStream is) throws IOException {
BufferedInputStream bis = new BufferedInputStream(is);
CustomObjectInputStream ois;
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (manager instanceof ManagerBase) {
ManagerBase managerBase = (ManagerBase) manager;
ois = new CustomObjectInputStream(bis, classLoader, manager.getContainer().getLogger(),
managerBase.getSessionAttributeValueClassNamePattern(),
managerBase.getWarnOnSessionAttributeFilterFailure());
} else {
ois = new CustomObjectInputStream(bis, classLoader);
}
return ois;
}
@Override
protected void initInternal() {
// NOOP
}
/**
* Start this component and implement the requirements
* of {@link LifecycleBase#startInternal()}.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
@Override
protected synchronized void startInternal() throws LifecycleException {
setState(LifecycleState.STARTING);
}
/**
* Stop this component and implement the requirements
* of {@link LifecycleBase#stopInternal()}.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
@Override
protected synchronized void stopInternal() throws LifecycleException {
setState(LifecycleState.STOPPING);
}
@Override
protected void destroyInternal() {
// NOOP
}
/**
* @return a String rendering of this object.
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder(this.getClass().getName());
sb.append('[');
if (manager == null) {
sb.append("Manager is null");
} else {
sb.append(manager);
}
sb.append(']');
return sb.toString();
}
}