/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.server.http;
import java.io.IOException;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.AsyncContext;
import javax.servlet.AsyncEvent;
import javax.servlet.AsyncListener;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import com.caucho.env.thread.ThreadPool;
import com.caucho.network.listen.AsyncController;
import com.caucho.network.listen.SocketLink;
import com.caucho.network.listen.SocketLinkCometListener;
import com.caucho.server.webapp.WebApp;
import com.caucho.util.L10N;
/**
* Public API to control a comet connection.
*/
public class AsyncContextImpl
implements AsyncContext, SocketLinkCometListener {
private static final L10N L = new L10N(ConnectionCometController.class);
private static final Logger log = Logger
.getLogger(ConnectionCometController.class.getName());
private SocketLink _tcpConnection;
private AsyncController _cometController;
private ServletRequest _request;
private ServletResponse _response;
private boolean _isOriginal;
private ArrayList<AsyncListenerNode> _listeners;
private AtomicBoolean _isComplete = new AtomicBoolean();
private WebApp _dispatchWebApp;
private String _dispatchPath;
public AsyncContextImpl(AbstractHttpRequest httpConn)
{
_tcpConnection = httpConn.getConnection();
_cometController = _tcpConnection.toComet(this);
}
public void restart()
{
_cometController = _tcpConnection.toComet(this);
}
public void init(ServletRequest request,
ServletResponse response,
boolean isOriginal)
{
_request = request;
_response = response;
if (! (request instanceof HttpServletRequest)) {
throw new IllegalStateException(L.l("startAsync requires a HttpServletRequest"));
}
_dispatchWebApp = (WebApp) request.getServletContext();
HttpServletRequest req = (HttpServletRequest) request;
String servletPath = req.getServletPath();
String pathInfo = req.getPathInfo();
if (pathInfo == null)
_dispatchPath = servletPath;
else if (servletPath == null)
_dispatchPath = pathInfo;
else
_dispatchPath = servletPath + pathInfo;
/* XXX: tck
if (_cometController == null)
throw new NullPointerException();
*/
_isOriginal = isOriginal;
onStart(req, response);
}
/**
* Returns the originating request for the async.
*/
@Override
public ServletRequest getRequest()
{
return _request;
}
/**
* Returns the originating request for the async.
*/
@Override
public ServletResponse getResponse()
{
return _response;
}
@Override
public boolean hasOriginalRequestAndResponse()
{
return _isOriginal;
}
/**
* Sets the suspend/idle timeout for the async request.
*/
@Override
public void setTimeout(long idleTimeout)
{
_cometController.setMaxIdleTime(idleTimeout);
}
/**
* Returns the suspend/idle timeout for the async request.
*/
@Override
public long getTimeout()
{
return _cometController.getMaxIdleTime();
}
/**
* Tests if the controller is active.
*/
private boolean isActive()
{
return _cometController != null;
}
public boolean isAsyncStarted()
{
AsyncController controller = _cometController;
return controller != null && controller.isAsyncStarted();
}
//
// dispatch values
//
ServletContext getDispatchContext()
{
return _dispatchWebApp;
}
String getDispatchPath()
{
return _dispatchPath;
}
//
// AsyncListener
//
@Override
public void addListener(AsyncListener listener)
{
addListener(listener, _request, _response);
}
public void addListener(AsyncListener listener,
ServletRequest request,
ServletResponse response)
{
if (_listeners == null)
_listeners = new ArrayList<AsyncListenerNode>();
_listeners.add(new AsyncListenerNode(listener, request, response, null));
}
@Override
public <T extends AsyncListener> T createListener(Class<T> cl)
throws ServletException
{
return _request.getServletContext().createListener(cl);
}
//
// Async dispatching
//
@Override
public void dispatch()
{
AsyncController cometController = _cometController;
if (cometController == null)
throw new IllegalStateException(L.l("dispatch is not valid when no AsyncContext is available"));
/*
else if (! cometController.isAsyncStarted())
throw new IllegalStateException(L.l("dispatch is not valid when async cycle has not started, i.e. before startAsync."));
*/
cometController.wake();
}
@Override
public void dispatch(String path)
{
_dispatchPath = path;
dispatch();
}
@Override
public void dispatch(ServletContext context, String path)
{
_dispatchWebApp = (WebApp) context;
_dispatchPath = path;
dispatch();
}
@Override
public void start(Runnable task)
{
if (isActive()) {
ThreadPool.getCurrent().schedule(task);
}
else
throw new IllegalStateException(
L.l("AsyncContext.start() is not allowed because the AsyncContext has been completed."));
}
/**
* Completes the comet connection
*/
@Override
public void complete()
{
AsyncController cometController = _cometController;
boolean isSuspend = _tcpConnection.isCometSuspend();
if (cometController != null) {
cometController.complete();
}
// TCK:
// XXX: should be on completing thread.
if (! isSuspend) {
onComplete();
}
/*
try {
} finally {
_cometController = null;
}
*/
}
//
// CometHandler callbacks
//
/**
* CometHandler callback when the connection starts.
*/
public void onStart(ServletRequest request,
ServletResponse response)
{
if (_listeners == null)
return;
AsyncEvent event = new AsyncEvent(this, request, response);
for (AsyncListenerNode node : _listeners) {
try {
node.onStart(event);
} catch (IOException e) {
log.log(Level.FINE, e.toString(), e);
}
}
}
/**
* CometHandler callback when the connection times out.
*/
@Override
public void onTimeout()
{
if (_listeners == null)
return;
AsyncEvent event = new AsyncEvent(this, _request, _response);
for (AsyncListenerNode node : _listeners) {
try {
node.onTimeout(event);
} catch (IOException e) {
log.log(Level.FINE, e.toString(), e);
}
}
}
/**
* CometHandler callback when the connection times out.
*/
public void onError()
{
if (_listeners == null)
return;
AsyncEvent event = new AsyncEvent(this, _request, _response);
for (AsyncListenerNode node : _listeners) {
try {
node.onError(event);
} catch (IOException e) {
log.log(Level.FINE, e.toString(), e);
}
}
}
@Override
public void onComplete()
{
if (_isComplete.getAndSet(true))
return;
if (_listeners == null)
return;
AsyncEvent event = new AsyncEvent(this, _request, _response);
for (AsyncListenerNode node : _listeners) {
try {
node.onComplete(event);
} catch (IOException e) {
log.log(Level.FINE, e.toString(), e);
}
}
}
@Override
public String toString()
{
return getClass().getSimpleName() + "[" + _cometController + "]";
}
}