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/**
* @file _httpreplyqueue.h
* @brief Internal declarations for the operation reply queue.
*
* $LicenseInfo:firstyear=2012&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2012, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef _LLCORE_HTTP_REPLY_QUEUE_H_
#define _LLCORE_HTTP_REPLY_QUEUE_H_
#include "_refcounted.h"
#include "_mutex.h"
#include "boost/noncopyable.hpp"
namespace LLCore
{
class HttpOperation;
/// Almost identical to the HttpRequestQueue class but
/// whereas that class is a singleton and is known to the
/// HttpService object, this queue is 1:1 with HttpRequest
/// instances and isn't explicitly referenced by the
/// service object. Instead, HttpOperation objects that
/// want to generate replies back to their creators also
/// keep references to the corresponding HttpReplyQueue.
/// The HttpService plumbing then simply delivers replies
/// to the requested reply queue.
///
/// One result of that is that the fetch operations do
/// not have a wait forever option. The service object
/// doesn't keep handles on everything it would need to
/// notify so it can't wake up sleepers should it need to
/// shutdown. So only non-blocking or timed-blocking modes
/// are anticipated. These are how most application consumers
/// will be coded anyway so it shouldn't be too much of a
/// burden.
class HttpReplyQueue : private boost::noncopyable
{
public:
typedef std::shared_ptr<HttpOperation> opPtr_t;
typedef std::shared_ptr<HttpReplyQueue> ptr_t;
HttpReplyQueue();
virtual ~HttpReplyQueue();
public:
typedef std::vector< opPtr_t > OpContainer;
/// Insert an object at the back of the reply queue.
///
/// Library also takes possession of one reference count to pass
/// through the queue.
///
/// Threading: callable by any thread.
void addOp(const opPtr_t &op);
/// Fetch an operation from the head of the queue. Returns
/// NULL if none exists.
///
/// Caller acquires reference count on returned operation.
///
/// Threading: callable by any thread.
opPtr_t fetchOp();
/// Caller acquires reference count on each returned operation
///
/// Threading: callable by any thread.
void fetchAll(OpContainer & ops);
protected:
OpContainer mQueue;
LLCoreInt::HttpMutex mQueueMutex;
}; // end class HttpReplyQueue
} // end namespace LLCore
#endif // _LLCORE_HTTP_REPLY_QUEUE_H_
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