51 lines
2.2 KiB
C++
51 lines
2.2 KiB
C++
/*
|
|
* MonitorLeader.h
|
|
*
|
|
* This source file is part of the FoundationDB open source project
|
|
*
|
|
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef FDBCLIENT_MONITORLEADER_H
|
|
#define FDBCLIENT_MONITORLEADER_H
|
|
#pragma once
|
|
|
|
#include "fdbclient/FDBTypes.h"
|
|
#include "fdbclient/CoordinationInterface.h"
|
|
|
|
#define CLUSTER_FILE_ENV_VAR_NAME "FDB_CLUSTER_FILE"
|
|
|
|
class ClientCoordinators;
|
|
|
|
template <class LeaderInterface>
|
|
Future<Void> monitorLeader( Reference<ClusterConnectionFile> const& connFile, Reference<AsyncVar<Optional<LeaderInterface>>> const& outKnownLeader, Reference<AsyncVar<int>> connectedCoordinatorsNum = Reference<AsyncVar<int>>() );
|
|
// Monitors the given coordination group's leader election process and provides a best current guess
|
|
// of the current leader. If a leader is elected for long enough and communication with a quorum of
|
|
// coordinators is possible, eventually outKnownLeader will be that leader's interface.
|
|
|
|
#pragma region Implementation
|
|
|
|
Future<Void> monitorLeaderInternal( Reference<ClusterConnectionFile> const& connFile, Reference<AsyncVar<Value>> const& outSerializedLeaderInfo, Reference<AsyncVar<int>> const& connectedCoordinatorsNum );
|
|
|
|
template <class LeaderInterface>
|
|
Future<Void> monitorLeader( Reference<ClusterConnectionFile> const& connFile, Reference<AsyncVar<Optional<LeaderInterface>>> const& outKnownLeader, Reference<AsyncVar<int>> connectedCoordinatorsNum ) {
|
|
Reference<AsyncVar<Value>> serializedInfo( new AsyncVar<Value> );
|
|
Future<Void> m = monitorLeaderInternal( connFile, serializedInfo, connectedCoordinatorsNum );
|
|
return m || asyncDeserialize( serializedInfo, outKnownLeader );
|
|
}
|
|
|
|
#pragma endregion
|
|
|
|
#endif |