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