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/*
* Copyright 2009 Mike Cumings
*
* 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.kenai.jbosh;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A request and response pair representing a single exchange with a remote
* content manager. This is primarily a container class intended to maintain
* the relationship between the request and response but allows the response
* to be added after the fact.
*/
final class HTTPExchange {
/**
* Logger.
*/
private static final Logger LOG =
Logger.getLogger(HTTPExchange.class.getName());
/**
* Request body.
*/
private final AbstractBody request;
/**
* Lock instance used to protect and provide conditions.
*/
private final Lock lock = new ReentrantLock();
/**
* Condition used to signal when the response has been set.
*/
private final Condition ready = lock.newCondition();
/**
* HTTPResponse instance.
*/
private HTTPResponse response;
///////////////////////////////////////////////////////////////////////////
// Constructor:
/**
* Create a new request/response pair object.
*
* @param req request message body
*/
HTTPExchange(final AbstractBody req) {
if (req == null) {
throw(new IllegalArgumentException("Request body cannot be null"));
}
request = req;
}
///////////////////////////////////////////////////////////////////////////
// Package-private methods:
/**
* Get the original request message.
*
* @return request message body.
*/
AbstractBody getRequest() {
return request;
}
/**
* Set the HTTPResponse instance.
*
* @return HTTPResponse instance associated with the request.
*/
void setHTTPResponse(HTTPResponse resp) {
lock.lock();
try {
if (response != null) {
throw(new IllegalStateException(
"HTTPResponse was already set"));
}
response = resp;
ready.signalAll();
} finally {
lock.unlock();
}
}
/**
* Get the HTTPResponse instance.
*
* @return HTTPResponse instance associated with the request.
*/
HTTPResponse getHTTPResponse() {
lock.lock();
try {
while (response == null) {
try {
ready.await();
} catch (InterruptedException intx) {
LOG.log(Level.FINEST, "Interrupted", intx);
}
}
return response;
} finally {
lock.unlock();
}
}
}
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