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/*
* RequestDispatcher.java February 2007
*
* Copyright (C) 2007, Niall Gallagher <niallg@users.sf.net>
*
* 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 org.simpleframework.http.core;
import static org.simpleframework.http.core.ContainerEvent.DISPATCH_FINISHED;
import static org.simpleframework.http.core.ContainerEvent.DISPATCH_REQUEST;
import static org.simpleframework.http.core.ContainerEvent.ERROR;
import org.simpleframework.http.Request;
import org.simpleframework.http.Response;
import org.simpleframework.http.message.Entity;
import org.simpleframework.transport.Channel;
import org.simpleframework.transport.trace.Trace;
/**
* The <code>RequestDispatcher</code> object is used to dispatch a
* request and response to the container. This is the root task that
* executes all transactions. A transaction is dispatched to the
* container which can deal with it asynchronously, however as a
* safeguard the dispatcher will catch any exceptions thrown and close
* the connection if required. Closing the connection if an exception
* is thrown ensures that CLOSE_WAIT issues do not arise with open
* connections that can not be closed within the container.
*
* @author Niall Gallagher
*
* @see org.simpleframework.http.core.Container
*/
class RequestDispatcher implements Runnable {
/**
* This is the observer object used to signal completion events.
*/
private final ResponseObserver observer;
/**
* This is the container that is used to handle the transactions.
*/
private final Container container;
/**
* This is the response object used to response to the request.
*/
private final Response response;
/**
* This is the request object which contains the request entity.
*/
private final Request request;
/**
* This is the channel associated with the request to dispatch.
*/
private final Channel channel;
/**
* This is the trace that is used to track the request dispatch.
*/
private final Trace trace;
/**
* Constructor for the <code>RequestDispatcher</code> object. This
* creates a request and response object using the provided entity,
* these can then be passed to the container to handle it.
*
* @param container this is the container to handle the request
* @param controller the controller used to handle the next request
* @param entity this contains the current request entity
*/
public RequestDispatcher(Container container, Controller controller, Entity entity) {
this.observer = new ResponseObserver(controller, entity);
this.request = new RequestEntity(observer, entity);
this.response = new ResponseEntity(observer, request, entity);
this.channel = entity.getChannel();
this.trace = channel.getTrace();
this.container = container;
}
/**
* This <code>run</code> method will dispatch the created request
* and response objects to the container. This will interpret the
* target and semantics from the request object and compose a
* response for the request which is sent to the connected client.
*/
public void run() {
try {
dispatch();
} catch(Exception cause) {
trace.trace(ERROR, cause);
} finally {
trace.trace(DISPATCH_FINISHED);
}
}
/**
* This <code>dispatch</code> method will dispatch the request
* and response objects to the container. This will interpret the
* target and semantics from the request object and compose a
* response for the request which is sent to the connected client.
* If there is an exception this will close the socket channel.
*/
private void dispatch() throws Exception {
try {
trace.trace(DISPATCH_REQUEST);
container.handle(request, response);
} catch(Throwable cause) {
trace.trace(ERROR, cause);
channel.close();
}
}
}
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