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/*
* SessionDispatcher.java February 2014
*
* Copyright (C) 2014, 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.socket.service;
import static org.simpleframework.http.socket.service.ServiceEvent.DISPATCH_SOCKET;
import static org.simpleframework.http.socket.service.ServiceEvent.ERROR;
import static org.simpleframework.http.socket.service.ServiceEvent.TERMINATE_SOCKET;
import org.simpleframework.http.Request;
import org.simpleframework.http.Response;
import org.simpleframework.http.socket.Session;
import org.simpleframework.transport.Channel;
import org.simpleframework.transport.trace.Trace;
/**
* The <code>SessionDispatcher</code> object is used to perform the
* opening handshake for a WebSocket session. Once the session has been
* established it is connected to a <code>Service</code> where frames
* can be sent and received. If for any reason the handshake fails
* this will terminated the connection with a HTTP 400 response.
*
* @author Niall Gallagher
*/
class SessionDispatcher {
/**
* This is used to create the session for the WebSocket.
*/
private final SessionBuilder builder;
/**
* This is used to select the service to dispatch to.
*/
private final Router router;
/**
* Constructor for the <code>SessionDispatcher</code> object. The
* dispatcher created will dispatch WebSocket sessions to a service
* using the provided <code>Router</code> instance.
*
* @param builder this is used to build the WebSocket session
* @param router this is used to select the service
*/
public SessionDispatcher(SessionBuilder builder, Router router) {
this.builder = builder;
this.router = router;
}
/**
* This method is used to create a dispatch a <code>Session</code> to
* a specific service selected by a router. If the session initiating
* handshake fails for any reason this will close the underlying TCP
* connection and send a HTTP 400 response back to the client.
*
* @param request this is the session initiating request
* @param response this is the session initiating response
*/
public void dispatch(Request request, Response response) {
Channel channel = request.getChannel();
Trace trace = channel.getTrace();
try {
Service service = router.route(request, response);
Session session = builder.create(request, response);
trace.trace(DISPATCH_SOCKET);
service.connect(session);
} catch(Exception cause) {
trace.trace(ERROR, cause);
terminate(request, response);
}
}
/**
* This method is used to terminate the connection and commit the
* response. Terminating the session before it has been dispatched
* is done when there is a protocol or an unexpected I/O error with
* the underlying TCP channel.
*
* @param request this is the session initiating request
* @param response this is the session initiating response
*/
public void terminate(Request request, Response response) {
Channel channel = request.getChannel();
Trace trace = channel.getTrace();
try {
response.close();
channel.close();
trace.trace(TERMINATE_SOCKET);
} catch(Exception cause) {
trace.trace(ERROR, cause);
}
}
}
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