mirror of https://gitee.com/bigwinds/arangodb
103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 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 Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#include "FlushThread.h"
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#include "ApplicationFeatures/ApplicationServer.h"
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#include "Basics/ConditionLocker.h"
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#include "Basics/Exceptions.h"
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#include "Logger/Logger.h"
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#include "RestServer/FlushFeature.h"
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#include "StorageEngine/EngineSelectorFeature.h"
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#include "StorageEngine/StorageEngine.h"
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using namespace arangodb;
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FlushThread::FlushThread(uint64_t flushInterval)
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: Thread("FlushThread"), _condition(), _flushInterval(flushInterval) {}
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/// @brief begin shutdown sequence
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void FlushThread::beginShutdown() {
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Thread::beginShutdown();
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// wake up ourselves
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wakeup();
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}
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/// @brief wake up the flush thread
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void FlushThread::wakeup() {
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CONDITION_LOCKER(guard, _condition);
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guard.signal();
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}
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/// @brief main loop
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void FlushThread::run() {
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FlushFeature* flushFeature =
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application_features::ApplicationServer::getFeature<FlushFeature>(
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"Flush");
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TRI_ASSERT(flushFeature != nullptr);
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StorageEngine* engine = EngineSelectorFeature::ENGINE;
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while (!isStopping()) {
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try {
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TRI_IF_FAILURE("FlushThreadDisableAll") {
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CONDITION_LOCKER(guard, _condition);
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guard.wait(_flushInterval);
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continue;
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}
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TRI_voc_tick_t toRelease = engine->currentTick();
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LOG_TOPIC(TRACE, Logger::FLUSH)
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<< "flush thread initiating sync for tick '" << toRelease << "'";
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engine->waitForSyncTick(toRelease);
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TRI_IF_FAILURE("FlushThreadCrashAfterWalSync") {
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TRI_SegfaultDebugging("crashing before flush thread callbacks");
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}
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flushFeature->executeCallbacks();
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TRI_IF_FAILURE("FlushThreadCrashAfterCallbacks") {
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TRI_SegfaultDebugging("crashing before releasing tick");
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}
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engine->waitForSyncTick(engine->currentTick()); // wait for callback trx
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engine->releaseTick(toRelease);
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LOG_TOPIC(TRACE, Logger::FLUSH)
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<< "released tick " << toRelease << " for garbage collection";
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// sleep if nothing to do
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CONDITION_LOCKER(guard, _condition);
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guard.wait(_flushInterval);
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} catch (basics::Exception const& ex) {
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if (ex.code() == TRI_ERROR_SHUTTING_DOWN) {
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break;
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}
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LOG_TOPIC(ERR, arangodb::Logger::FLUSH)
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<< "caught exception in FlushThread: " << ex.what();
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} catch (std::exception const& ex) {
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LOG_TOPIC(ERR, arangodb::Logger::FLUSH)
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<< "caught exception in FlushThread: " << ex.what();
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} catch (...) {
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LOG_TOPIC(ERR, arangodb::Logger::FLUSH)
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<< "caught unknown exception in FlushThread";
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}
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}
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}
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