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