mirror of https://gitee.com/bigwinds/arangodb
101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////
|
|
/// DISCLAIMER
|
|
///
|
|
/// Copyright 2016 ArangoDB GmbH, Cologne, Germany
|
|
///
|
|
/// Licensed under the Apache License, Version 2.0 (the "License");
|
|
/// you may not use this file except in compliance with the License.
|
|
/// You may obtain a copy of the License at
|
|
///
|
|
/// http://www.apache.org/licenses/LICENSE-2.0
|
|
///
|
|
/// Unless required by applicable law or agreed to in writing, software
|
|
/// distributed under the License is distributed on an "AS IS" BASIS,
|
|
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
/// See the License for the specific language governing permissions and
|
|
/// limitations under the License.
|
|
///
|
|
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
|
|
///
|
|
/// @author Jan Steemann
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef ARANGODB_REPLICATION_REPLICATION_FEATURE_H
|
|
#define ARANGODB_REPLICATION_REPLICATION_FEATURE_H 1
|
|
|
|
#include "ApplicationFeatures/ApplicationFeature.h"
|
|
#include "Cluster/ServerState.h"
|
|
#include "Replication/GlobalReplicationApplier.h"
|
|
|
|
struct TRI_vocbase_t;
|
|
|
|
namespace arangodb {
|
|
|
|
class GeneralResponse;
|
|
|
|
class ReplicationFeature final : public application_features::ApplicationFeature {
|
|
public:
|
|
explicit ReplicationFeature(application_features::ApplicationServer& server);
|
|
|
|
void collectOptions(std::shared_ptr<options::ProgramOptions> options) override final;
|
|
void validateOptions(std::shared_ptr<options::ProgramOptions>) override final;
|
|
void prepare() override final;
|
|
void start() override final;
|
|
void beginShutdown() override final;
|
|
void stop() override final;
|
|
void unprepare() override final;
|
|
|
|
/// @brief return a pointer to the global replication applier
|
|
GlobalReplicationApplier* globalReplicationApplier() const {
|
|
TRI_ASSERT(_globalReplicationApplier != nullptr);
|
|
return _globalReplicationApplier.get();
|
|
}
|
|
|
|
/// @brief disable replication appliers
|
|
void disableReplicationApplier() { _replicationApplierAutoStart = false; }
|
|
|
|
/// @brief start the replication applier for a single database
|
|
void startApplier(TRI_vocbase_t* vocbase);
|
|
|
|
/// @brief stop the replication applier for a single database
|
|
void stopApplier(TRI_vocbase_t* vocbase);
|
|
|
|
/// @brief automatic failover of replication using the agency
|
|
bool isActiveFailoverEnabled() const { return _enableActiveFailover; }
|
|
|
|
/// @brief track the number of (parallel) tailing operations
|
|
/// will throw an exception if the number of concurrently running operations
|
|
/// would exceed the configured maximum
|
|
void trackTailingStart();
|
|
|
|
/// @brief count down the number of parallel tailing operations
|
|
/// must only be called after a successful call to trackTailingstart
|
|
void trackTailingEnd() noexcept;
|
|
|
|
/// @brief set the x-arango-endpoint header
|
|
static void setEndpointHeader(GeneralResponse*, arangodb::ServerState::Mode);
|
|
|
|
/// @brief fill a response object with correct response for a follower
|
|
static void prepareFollowerResponse(GeneralResponse*, arangodb::ServerState::Mode);
|
|
|
|
static ReplicationFeature* INSTANCE;
|
|
|
|
private:
|
|
bool _replicationApplierAutoStart;
|
|
|
|
/// Enable the active failover
|
|
bool _enableActiveFailover;
|
|
|
|
/// @brief number of currently operating tailing operations
|
|
std::atomic<uint64_t> _parallelTailingInvocations;
|
|
|
|
/// @brief maximum number of parallel tailing operations invocations
|
|
uint64_t _maxParallelTailingInvocations;
|
|
|
|
std::unique_ptr<GlobalReplicationApplier> _globalReplicationApplier;
|
|
};
|
|
|
|
} // namespace arangodb
|
|
|
|
#endif
|