/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates.
*
* 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.
*/
package org.optaplanner.core.impl.solver.termination;
import org.optaplanner.core.impl.phase.scope.AbstractPhaseScope;
import org.optaplanner.core.impl.solver.ChildThreadType;
import org.optaplanner.core.impl.solver.scope.DefaultSolverScope;
public class ChildThreadPlumbingTermination extends AbstractTermination {
protected boolean terminateChildren = false;
// ************************************************************************
// Plumbing worker methods
// ************************************************************************
/**
* This method is thread-safe.
* @return true if successful
*/
public synchronized boolean terminateChildren() {
boolean terminationEarlySuccessful = !terminateChildren;
terminateChildren = true;
return terminationEarlySuccessful;
}
/**
* This method is thread-safe.
*/
public synchronized boolean isTerminateChildren() {
return terminateChildren;
}
// ************************************************************************
// Termination worker methods
// ************************************************************************
@Override
public synchronized boolean isSolverTerminated(DefaultSolverScope solverScope) {
// Destroying a thread pool with solver threads will only cause it to interrupt those child solver threads
if (Thread.currentThread().isInterrupted()) { // Does not clear the interrupted flag
logger.info("A child solver thread got interrupted, so these child solvers are terminating early.");
terminateChildren = true;
}
return terminateChildren;
}
@Override
public boolean isPhaseTerminated(AbstractPhaseScope phaseScope) {
throw new IllegalStateException(ChildThreadPlumbingTermination.class.getSimpleName()
+ " configured only as solver termination."
+ " It is always bridged to phase termination.");
}
@Override
public double calculateSolverTimeGradient(DefaultSolverScope solverScope) {
return -1.0; // Not supported
}
@Override
public double calculatePhaseTimeGradient(AbstractPhaseScope phaseScope) {
throw new IllegalStateException(ChildThreadPlumbingTermination.class.getSimpleName()
+ " configured only as solver termination."
+ " It is always bridged to phase termination.");
}
// ************************************************************************
// Other methods
// ************************************************************************
@Override
public Termination createChildThreadTermination(DefaultSolverScope solverScope, ChildThreadType childThreadType) {
return this;
}
@Override
public String toString() {
return "ChildThreadPlumbing()";
}
}