86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
/*
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* genericactors.actor.cpp
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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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#include "flow/flow.h"
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#include "flow/actorcompiler.h" // This must be the last #include.
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ACTOR Future<bool> allTrue( std::vector<Future<bool>> all ) {
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state int i=0;
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while (i != all.size()) {
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bool r = wait( all[i] );
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if (!r) return false;
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i++;
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}
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return true;
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}
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ACTOR Future<Void> anyTrue( std::vector<Reference<AsyncVar<bool>>> input, Reference<AsyncVar<bool>> output ) {
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loop {
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bool oneTrue = false;
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std::vector<Future<Void>> changes;
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for(auto it : input) {
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if( it->get() ) oneTrue = true;
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changes.push_back( it->onChange() );
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}
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output->set( oneTrue );
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wait( waitForAny(changes) );
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}
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}
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ACTOR Future<Void> cancelOnly( std::vector<Future<Void>> futures ) {
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// We don't do anything with futures except hold them, we never return, but if we are cancelled we (naturally) drop the futures
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wait( Never() );
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return Void();
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}
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ACTOR Future<Void> timeoutWarningCollector( FutureStream<Void> input, double logDelay, const char* context, UID id ) {
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state uint64_t counter = 0;
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state Future<Void> end = delay( logDelay );
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loop choose {
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when ( waitNext( input ) ) {
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counter++;
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}
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when ( wait( end ) ) {
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if( counter )
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TraceEvent(SevWarn, context, id).detail("LateProcessCount", counter).detail("LoggingDelay", logDelay);
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end = delay( logDelay );
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counter = 0;
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}
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}
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}
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ACTOR Future<bool> quorumEqualsTrue( std::vector<Future<bool>> futures, int required ) {
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state std::vector< Future<Void> > true_futures;
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state std::vector< Future<Void> > false_futures;
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for(int i=0; i<futures.size(); i++) {
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true_futures.push_back( onEqual( futures[i], true ) );
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false_futures.push_back( onEqual( futures[i], false ) );
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}
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choose {
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when( wait( quorum( true_futures, required ) ) ) {
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return true;
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}
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when( wait( quorum( false_futures, futures.size() - required + 1 ) ) ) {
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return false;
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}
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}
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}
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