mirror of https://gitee.com/bigwinds/arangodb
297 lines
11 KiB
C++
297 lines
11 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief base class for input-output tasks from sockets
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2014 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Achim Brandt
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/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2009-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_SCHEDULER_SOCKET_TASK_H
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#define ARANGODB_SCHEDULER_SOCKET_TASK_H 1
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#include "Basics/Common.h"
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#include "Scheduler/Task.h"
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#include "Basics/Mutex.h"
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#include "Basics/Thread.h"
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#include "Statistics/StatisticsAgent.h"
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#ifdef _WIN32
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#include "Basics/win-utils.h"
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#endif
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#include "Basics/socket-utils.h"
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// -----------------------------------------------------------------------------
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// --SECTION-- forward declarations
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// -----------------------------------------------------------------------------
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namespace triagens {
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namespace basics {
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class StringBuffer;
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- class SocketTask
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// -----------------------------------------------------------------------------
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namespace rest {
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////////////////////////////////////////////////////////////////////////////////
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/// @brief base class for input-output tasks from sockets
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////////////////////////////////////////////////////////////////////////////////
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class SocketTask : virtual public Task,
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public ConnectionStatisticsAgent {
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private:
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SocketTask (SocketTask const&);
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SocketTask& operator= (SocketTask const&);
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private:
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static size_t const READ_BLOCK_SIZE = 10000;
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructs a new task with a given socket
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////////////////////////////////////////////////////////////////////////////////
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public:
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explicit
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SocketTask (TRI_socket_t, double);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief deletes a socket task
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///
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/// This method will close the underlying socket.
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////////////////////////////////////////////////////////////////////////////////
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protected:
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~SocketTask ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// set a request timeout
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////////////////////////////////////////////////////////////////////////////////
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public:
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void setKeepAliveTimeout (double);
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// -----------------------------------------------------------------------------
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// --SECTION-- protected virtual methods
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// -----------------------------------------------------------------------------
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protected:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief fills the read buffer
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///
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/// The function should be called by the input task if the scheduler has
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/// indicated that new data is available. It will return true, if data could
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/// be read and false if the connection has been closed.
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////////////////////////////////////////////////////////////////////////////////
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virtual bool fillReadBuffer ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief handles a read
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////////////////////////////////////////////////////////////////////////////////
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virtual bool handleRead () = 0;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief handles a write
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////////////////////////////////////////////////////////////////////////////////
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virtual bool handleWrite ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief called if write buffer has been sent
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///
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/// This called is called if the current write buffer has been sent
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/// completly to the client.
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////////////////////////////////////////////////////////////////////////////////
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virtual void completedWriteBuffer () = 0;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief handles a keep-alive timeout
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////////////////////////////////////////////////////////////////////////////////
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virtual void handleTimeout () = 0;
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// -----------------------------------------------------------------------------
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// --SECTION-- protected methods
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// -----------------------------------------------------------------------------
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protected:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets an active write buffer
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////////////////////////////////////////////////////////////////////////////////
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void setWriteBuffer (basics::StringBuffer*,
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TRI_request_statistics_t*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief checks for presence of an active write buffer
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////////////////////////////////////////////////////////////////////////////////
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bool hasWriteBuffer () const;
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// -----------------------------------------------------------------------------
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// --SECTION-- Task methods
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// -----------------------------------------------------------------------------
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protected:
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////////////////////////////////////////////////////////////////////////////////
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/// {@inheritDoc}
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////////////////////////////////////////////////////////////////////////////////
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bool setup (Scheduler*, EventLoop) override;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief cleans up the task by unregistering all watchers
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////////////////////////////////////////////////////////////////////////////////
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void cleanup () override;
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////////////////////////////////////////////////////////////////////////////////
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/// {@inheritDoc}
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////////////////////////////////////////////////////////////////////////////////
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bool handleEvent (EventToken token, EventType) override;
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// -----------------------------------------------------------------------------
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// --SECTION-- protected variables
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// -----------------------------------------------------------------------------
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protected:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief event for keep-alive timeout
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////////////////////////////////////////////////////////////////////////////////
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EventToken _keepAliveWatcher;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief event for read
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////////////////////////////////////////////////////////////////////////////////
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EventToken _readWatcher;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief event for write
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////////////////////////////////////////////////////////////////////////////////
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EventToken _writeWatcher;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief event for async
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////////////////////////////////////////////////////////////////////////////////
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EventToken _asyncWatcher;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief communication socket
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////////////////////////////////////////////////////////////////////////////////
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TRI_socket_t _commSocket;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief keep-alive timeout in seconds
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////////////////////////////////////////////////////////////////////////////////
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double _keepAliveTimeout;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief the current write buffer
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////////////////////////////////////////////////////////////////////////////////
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basics::StringBuffer* _writeBuffer;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief the current write buffer statistics
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////////////////////////////////////////////////////////////////////////////////
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TRI_request_statistics_t* _writeBufferStatistics;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief number of bytes already written
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////////////////////////////////////////////////////////////////////////////////
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size_t _writeLength;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief read buffer
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///
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/// The function fillReadBuffer stores the data in this buffer.
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////////////////////////////////////////////////////////////////////////////////
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basics::StringBuffer* _readBuffer;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief client has closed the connection
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////////////////////////////////////////////////////////////////////////////////
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bool _clientClosed;
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// -----------------------------------------------------------------------------
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// --SECTION-- protected variables
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief current thread identifier
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////////////////////////////////////////////////////////////////////////////////
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TRI_tid_t _tid;
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};
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}
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}
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#endif
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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