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/**
* @file httphandler.h
* @brief Public-facing declarations for the HttpHandler class
*
* $LicenseInfo:firstyear=2012&license=viewerlgpl$
* 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_HANDLER_H_
#define _LLCORE_HTTP_HANDLER_H_
#include "httpcommon.h"
namespace LLCore
{
class HttpResponse;
/// HttpHandler defines an interface used by the library to
/// notify library callers of significant events, currently
/// request completion. Callers must derive or mixin this class
/// then provide an implementation of the @see onCompleted
/// method to receive such notifications. An instance may
/// be shared by any number of requests and across instances
/// of HttpRequest running in the same thread.
///
/// Threading: HttpHandler itself is interface and is
/// tread-compatible. Most derivations, however, will have
/// different constraints.
///
/// Allocation: Not refcounted, may be stack allocated though
/// that is rarely a good idea. Queued requests and replies keep
/// a naked pointer to the handler and this can result in a
/// dangling pointer if lifetimes aren't managed correctly.
///
/// *TODO: public std::enable_shared_from_this<HttpHandler>
class HttpHandler
{
public:
typedef std::shared_ptr<HttpHandler> ptr_t;
typedef std::weak_ptr<HttpHandler> wptr_t;
virtual ~HttpHandler()
{ }
/// Method invoked during calls to @see update(). Each invocation
/// represents the completion of some requested operation. Caller
/// can identify the request from the handle and interrogate the
/// response argument for success/failure, data and other information.
///
/// @param handle Identifier of the request generating
/// the notification.
/// @param response Supplies detailed information about
/// the request including status codes
/// (both programming and HTTP), HTTP body
/// data and encodings, headers, etc.
/// The response object is refcounted and
/// the called code may retain the object
/// by invoking @see addRef() on it. The
/// library itself drops all references to
/// to object on return and never touches
/// it again.
///
virtual void onCompleted(HttpHandle handle, HttpResponse * response) = 0;
}; // end class HttpHandler
} // end namespace LLCore
#endif // _LLCORE_HTTP_HANDLER_H_
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