mirror of https://gitee.com/bigwinds/arangodb
207 lines
7.0 KiB
C++
207 lines
7.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief heartbeat thread
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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 2010-2012 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 triAGENS GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Copyright 2013, triagens GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef TRIAGENS_CLUSTER_HEARTBEAT_THREAD_H
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#define TRIAGENS_CLUSTER_HEARTBEAT_THREAD_H 1
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#include "Basics/Common.h"
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#include "Basics/ConditionVariable.h"
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#include "Basics/Thread.h"
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#include "BasicsC/logging.h"
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#include "Cluster/AgencyComm.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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namespace triagens {
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namespace arango {
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// -----------------------------------------------------------------------------
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// --SECTION-- HeartbeatThread
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// -----------------------------------------------------------------------------
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class HeartbeatThread : public basics::Thread {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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private:
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HeartbeatThread (HeartbeatThread const&);
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HeartbeatThread& operator= (HeartbeatThread const&);
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructs a heartbeat thread
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////////////////////////////////////////////////////////////////////////////////
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HeartbeatThread (uint64_t,
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uint64_t);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroys a heartbeat thread
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////////////////////////////////////////////////////////////////////////////////
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~HeartbeatThread ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initialises the heartbeat
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////////////////////////////////////////////////////////////////////////////////
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bool init ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief stops the heartbeat
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////////////////////////////////////////////////////////////////////////////////
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void stop () {
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if (_stop > 0) {
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return;
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}
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LOG_TRACE("stopping heartbeat thread");
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_stop = 1;
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_condition.signal();
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while (_stop != 2) {
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usleep(1000);
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}
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- Thread methods
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// -----------------------------------------------------------------------------
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protected:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief heartbeat main loop
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////////////////////////////////////////////////////////////////////////////////
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void run ();
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// -----------------------------------------------------------------------------
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// --SECTION-- private methods
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief handles a state change
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////////////////////////////////////////////////////////////////////////////////
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bool handleStateChange (AgencyCommResult const&,
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uint64_t&);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief fetch the last value of Sync/Commands/my-id from the agency
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////////////////////////////////////////////////////////////////////////////////
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uint64_t getLastCommandIndex ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sends the current server's state to the agency
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////////////////////////////////////////////////////////////////////////////////
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bool sendState ();
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief AgencyComm instance
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////////////////////////////////////////////////////////////////////////////////
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AgencyComm _agency;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief condition variable for heartbeat
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////////////////////////////////////////////////////////////////////////////////
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triagens::basics::ConditionVariable _condition;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief this server's id
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////////////////////////////////////////////////////////////////////////////////
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const std::string _myId;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief heartbeat interval
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////////////////////////////////////////////////////////////////////////////////
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uint64_t _interval;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief number of fails in a row before a warning is issued
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////////////////////////////////////////////////////////////////////////////////
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uint64_t _maxFailsBeforeWarning;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief current number of fails in a row
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////////////////////////////////////////////////////////////////////////////////
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uint64_t _numFails;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief stop flag
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////////////////////////////////////////////////////////////////////////////////
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volatile sig_atomic_t _stop;
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};
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}
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "^\\(/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|// --SECTION--\\|/// @\\}\\)"
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// End:
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