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/*
* Copyright 2011 Vaadin Ltd.
*
* Licensed 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 com.vaadin.server;
import java.io.PrintWriter;
import java.io.Serializable;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
import com.vaadin.Application;
import com.vaadin.service.ApplicationContext;
/**
* Base class for web application contexts (including portlet contexts) that
* handles the common tasks.
*/
public abstract class AbstractWebApplicationContext implements
ApplicationContext, HttpSessionBindingListener, Serializable {
protected Collection<TransactionListener> listeners = Collections
.synchronizedList(new LinkedList<TransactionListener>());
protected final HashSet<Application> applications = new HashSet<Application>();
protected WebBrowser browser = new WebBrowser();
protected HashMap<Application, AbstractCommunicationManager> applicationToAjaxAppMgrMap = new HashMap<Application, AbstractCommunicationManager>();
private long totalSessionTime = 0;
private long lastRequestTime = -1;
@Override
public void addTransactionListener(TransactionListener listener) {
if (listener != null) {
listeners.add(listener);
}
}
@Override
public void removeTransactionListener(TransactionListener listener) {
listeners.remove(listener);
}
/**
* Sends a notification that a transaction is starting.
*
* @param application
* The application associated with the transaction.
* @param request
* the HTTP or portlet request that triggered the transaction.
*/
protected void startTransaction(Application application, Object request) {
ArrayList<TransactionListener> currentListeners;
synchronized (listeners) {
currentListeners = new ArrayList<TransactionListener>(listeners);
}
for (TransactionListener listener : currentListeners) {
listener.transactionStart(application, request);
}
}
/**
* Sends a notification that a transaction has ended.
*
* @param application
* The application associated with the transaction.
* @param request
* the HTTP or portlet request that triggered the transaction.
*/
protected void endTransaction(Application application, Object request) {
LinkedList<Exception> exceptions = null;
ArrayList<TransactionListener> currentListeners;
synchronized (listeners) {
currentListeners = new ArrayList<TransactionListener>(listeners);
}
for (TransactionListener listener : currentListeners) {
try {
listener.transactionEnd(application, request);
} catch (final RuntimeException t) {
if (exceptions == null) {
exceptions = new LinkedList<Exception>();
}
exceptions.add(t);
}
}
// If any runtime exceptions occurred, throw a combined exception
if (exceptions != null) {
final StringBuffer msg = new StringBuffer();
for (Exception e : exceptions) {
if (msg.length() == 0) {
msg.append("\n\n--------------------------\n\n");
}
msg.append(e.getMessage() + "\n");
final StringWriter trace = new StringWriter();
e.printStackTrace(new PrintWriter(trace, true));
msg.append(trace.toString());
}
throw new RuntimeException(msg.toString());
}
}
/**
* @see javax.servlet.http.HttpSessionBindingListener#valueBound(HttpSessionBindingEvent)
*/
@Override
public void valueBound(HttpSessionBindingEvent arg0) {
// We are not interested in bindings
}
/**
* @see javax.servlet.http.HttpSessionBindingListener#valueUnbound(HttpSessionBindingEvent)
*/
@Override
public void valueUnbound(HttpSessionBindingEvent event) {
// If we are going to be unbound from the session, the session must be
// closing
try {
while (!applications.isEmpty()) {
final Application app = applications.iterator().next();
app.close();
removeApplication(app);
}
} catch (Exception e) {
// This should never happen but is possible with rare
// configurations (e.g. robustness tests). If you have one
// thread doing HTTP socket write and another thread trying to
// remove same application here. Possible if you got e.g. session
// lifetime 1 min but socket write may take longer than 1 min.
// FIXME: Handle exception
getLogger().log(Level.SEVERE,
"Could not remove application, leaking memory.", e);
}
}
/**
* Get the web browser associated with this application context.
*
* Because application context is related to the http session and server
* maintains one session per browser-instance, each context has exactly one
* web browser associated with it.
*
* @return
*/
public WebBrowser getBrowser() {
return browser;
}
@Override
public Collection<Application> getApplications() {
return Collections.unmodifiableCollection(applications);
}
protected void removeApplication(Application application) {
applications.remove(application);
applicationToAjaxAppMgrMap.remove(application);
}
/**
* @return The total time spent servicing requests in this session.
*/
public long getTotalSessionTime() {
return totalSessionTime;
}
/**
* Sets the time spent servicing the last request in the session and updates
* the total time spent servicing requests in this session.
*
* @param time
* the time spent in the last request.
*/
public void setLastRequestTime(long time) {
lastRequestTime = time;
totalSessionTime += time;
}
/**
* @return the time spent servicing the last request in this session.
*/
public long getLastRequestTime() {
return lastRequestTime;
}
private Logger getLogger() {
return Logger.getLogger(AbstractWebApplicationContext.class.getName());
}
}
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