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Drools Planner optimizes automated planning by combining metaheuristic search algorithms with rule
engine powered score calculation. This is the drools-planner-core module which contains metaheuristic
algorithms.
/*
* Copyright 2011 JBoss Inc
*
* 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.drools.planner.core.solver;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import org.drools.planner.core.phase.AbstractSolverPhaseScope;
import org.drools.planner.core.termination.AbstractTermination;
public class BasicPlumbingTermination extends AbstractTermination {
protected AtomicBoolean terminatedEarly = new AtomicBoolean(false);
protected BlockingQueue problemFactChangeQueue = new LinkedBlockingQueue();
// ************************************************************************
// Plumbing worker methods
// ************************************************************************
public void resetTerminateEarly() {
terminatedEarly.set(false);
}
public boolean terminateEarly() {
boolean terminationEarlySuccessful = !terminatedEarly.getAndSet(true);
if (terminationEarlySuccessful) {
logger.info("Terminating solver early.");
}
return terminationEarlySuccessful;
}
public boolean isTerminateEarly() {
return terminatedEarly.get();
}
public boolean addProblemFactChange(ProblemFactChange problemFactChange) {
return problemFactChangeQueue.add(problemFactChange);
}
public BlockingQueue getProblemFactChangeQueue() {
return problemFactChangeQueue;
}
// ************************************************************************
// Termination worker methods
// ************************************************************************
public boolean isSolverTerminated(DefaultSolverScope solverScope) {
return terminatedEarly.get() || !problemFactChangeQueue.isEmpty();
}
public boolean isPhaseTerminated(AbstractSolverPhaseScope solverPhaseScope) {
throw new UnsupportedOperationException("BasicPlumbingTermination can only be used for solver termination.");
}
public double calculateSolverTimeGradient(DefaultSolverScope solverScope) {
return -1.0; // Not supported
}
public double calculatePhaseTimeGradient(AbstractSolverPhaseScope solverPhaseScope) {
throw new UnsupportedOperationException("BasicPlumbingTermination can only be used for solver termination.");
}
}