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/**
* @file _httpoperation.h
* @brief Internal declarations for HttpOperation and sub-classes
*
* $LicenseInfo:firstyear=2012&license=viewerlgpl$
* 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_OPERATION_H_
#define _LLCORE_HTTP_OPERATION_H_
#include "httpcommon.h"
#include "httprequest.h"
#include "_refcounted.h"
namespace LLCore
{
class HttpReplyQueue;
class HttpHandler;
class HttpService;
/// HttpOperation is the base class for all request/reply
/// pairs.
///
/// Operations are expected to be of two types: immediate
/// and queued. Immediate requests go to the singleton
/// request queue and when picked up by the worker thread
/// are executed immediately and there results placed on
/// the supplied reply queue. Queued requests (namely for
/// HTTP operations), go to the request queue, are picked
/// up and moved to a ready queue where they're ordered by
/// priority and managed by the policy component, are
/// then activated issuing HTTP requests and moved to an
/// active list managed by the transport (libcurl) component
/// and eventually finalized when a response is available
/// and status and data return via reply queue.
///
/// To manage these transitions, derived classes implement
/// three methods: stageFromRequest, stageFromReady and
/// stageFromActive. Immediate requests will only override
/// stageFromRequest which will perform the operation and
/// return the result by invoking addAsReply() to put the
/// request on a reply queue. Queued requests will involve
/// all three stage methods.
///
/// Threading: not thread-safe. Base and derived classes
/// provide no locking. Instances move across threads
/// via queue-like interfaces that are thread compatible
/// and those interfaces establish the access rules.
class HttpOperation : public LLCoreInt::RefCounted
{
public:
HttpOperation();
virtual ~HttpOperation();
private:
HttpOperation(const HttpOperation &); // Not defined
void operator=(const HttpOperation &); // Not defined
public:
void setHandlers(HttpReplyQueue * reply_queue,
HttpHandler * lib_handler,
HttpHandler * user_handler);
HttpHandler * getUserHandler() const
{
return mUserHandler;
}
virtual void stageFromRequest(HttpService *);
virtual void stageFromReady(HttpService *);
virtual void stageFromActive(HttpService *);
virtual void visitNotifier(HttpRequest *);
virtual HttpStatus cancel();
protected:
void addAsReply();
protected:
HttpReplyQueue * mReplyQueue; // Have refcount
HttpHandler * mLibraryHandler; // Have refcount
HttpHandler * mUserHandler; // Have refcount
public:
HttpRequest::policy_t mReqPolicy;
HttpRequest::priority_t mReqPriority;
}; // end class HttpOperation
/// HttpOpStop requests the servicing thread to shutdown
/// operations, cease pulling requests from the request
/// queue and release shared resources (particularly
/// those shared via reference count). The servicing
/// thread will then exit. The underlying thread object
/// remains so that another thread can join on the
/// servicing thread prior to final cleanup. The
/// request *does* generate a reply on the response
/// queue, if requested.
class HttpOpStop : public HttpOperation
{
public:
HttpOpStop();
virtual ~HttpOpStop();
private:
HttpOpStop(const HttpOpStop &); // Not defined
void operator=(const HttpOpStop &); // Not defined
public:
virtual void stageFromRequest(HttpService *);
}; // end class HttpOpStop
/// HttpOpNull is a do-nothing operation used for testing via
/// a basic loopback pattern. It's executed immediately by
/// the servicing thread which bounces a reply back to the
/// caller without any further delay.
class HttpOpNull : public HttpOperation
{
public:
HttpOpNull();
virtual ~HttpOpNull();
private:
HttpOpNull(const HttpOpNull &); // Not defined
void operator=(const HttpOpNull &); // Not defined
public:
virtual void stageFromRequest(HttpService *);
}; // end class HttpOpNull
} // end namespace LLCore
#endif // _LLCORE_HTTP_OPERATION_H_
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