75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/*
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* Orderer.actor.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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#pragma once
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// When actually compiled (NO_INTELLISENSE), include the generated version of this file. In intellisense use the source version.
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#if defined(NO_INTELLISENSE) && !defined(FDBSERVER_ORDERER_ACTOR_G_H)
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#define FDBSERVER_ORDERER_ACTOR_G_H
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#include "Orderer.actor.g.h"
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#elif !defined(FDBSERVER_ORDERER_ACTOR_H)
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#define FDBSERVER_ORDERER_ACTOR_H
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#include "fdbclient/Notified.h"
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#include "flow/actorcompiler.h"
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template <class Seq>
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class Orderer {
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public:
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explicit Orderer( Seq s ) : ready(s), started(false) {}
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void reset( Seq s ) {
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ready = NotifiedVersion(s);
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started = false;
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}
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Future<bool> order( Seq s, int taskID = TaskDefaultYield ) {
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if ( ready.get() < s )
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return waitAndOrder( this, s, taskID );
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else
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return dedup(s);
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}
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void complete( Seq s ) {
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ASSERT( s == ready.get() && started );
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started = false;
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ready.set(s+1);
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}
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Seq getNextSequence() { return ready.get(); } // Returns the next sequence number which has *not* been returned from order()
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Future<Void> whenNextSequenceAtLeast( Seq v ) {
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return ready.whenAtLeast(v);
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}
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private:
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ACTOR static Future<bool> waitAndOrder( Orderer<Seq>* self, Seq s, int taskID ) {
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Void _ = wait( self->ready.whenAtLeast(s) );
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Void _ = wait( yield( taskID ) || self->shutdown.getFuture() );
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return self->dedup(s);
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}
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bool dedup( Seq s ) {
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if (s != ready.get() || started)
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return false;
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started = true;
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return true;
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}
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bool started;
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NotifiedVersion ready; // FIXME: Notified<Seq>
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Promise<Void> shutdown; // Never set, only broken on destruction
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};
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#endif
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