org.optaplanner.examples.investment.solver.move.factory.InvestmentBiQuantityTransferMoveIteratorFactory Maven / Gradle / Ivy
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OptaPlanner solves planning problems.
This lightweight, embeddable planning engine implements powerful and scalable algorithms
to optimize business resource scheduling and planning.
This module contains the examples which demonstrate how to use it in a normal Java application.
/*
* Copyright 2015 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.examples.investment.solver.move.factory;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import org.optaplanner.core.impl.heuristic.move.CompositeMove;
import org.optaplanner.core.impl.heuristic.move.Move;
import org.optaplanner.core.impl.heuristic.selector.move.factory.MoveIteratorFactory;
import org.optaplanner.core.impl.score.director.ScoreDirector;
import org.optaplanner.core.impl.solver.random.RandomUtils;
import org.optaplanner.examples.investment.domain.AssetClassAllocation;
import org.optaplanner.examples.investment.domain.InvestmentSolution;
import org.optaplanner.examples.investment.domain.util.InvestmentNumericUtil;
import org.optaplanner.examples.investment.solver.move.InvestmentQuantityTransferMove;
public class InvestmentBiQuantityTransferMoveIteratorFactory implements MoveIteratorFactory {
@Override
public long getSize(ScoreDirector scoreDirector) {
InvestmentSolution solution = scoreDirector.getWorkingSolution();
int size = solution.getAssetClassAllocationList().size();
// The MAXIMUM_QUANTITY_MILLIS accounts for all fromAllocations too
return InvestmentNumericUtil.MAXIMUM_QUANTITY_MILLIS
* InvestmentNumericUtil.MAXIMUM_QUANTITY_MILLIS
* (size - 1) * (size - 1);
}
@Override
public Iterator> createOriginalMoveIterator(
ScoreDirector scoreDirector) {
throw new UnsupportedOperationException();
}
@Override
public Iterator> createRandomMoveIterator(
ScoreDirector scoreDirector, Random workingRandom) {
InvestmentSolution solution = scoreDirector.getWorkingSolution();
List allocationList = solution.getAssetClassAllocationList();
List nonEmptyAllocationList = new ArrayList<>(allocationList);
nonEmptyAllocationList.removeIf(allocation -> allocation.getQuantityMillis() == 0L);
return new RandomInvestmentBiQuantityTransferMoveIterator(allocationList,
nonEmptyAllocationList, workingRandom);
}
private static class RandomInvestmentBiQuantityTransferMoveIterator implements Iterator> {
private final List allocationList;
private final List nonEmptyAllocationList;
private final Random workingRandom;
public RandomInvestmentBiQuantityTransferMoveIterator(List allocationList,
List nonEmptyAllocationList, Random workingRandom) {
this.allocationList = allocationList;
this.nonEmptyAllocationList = nonEmptyAllocationList;
this.workingRandom = workingRandom;
}
@Override
public boolean hasNext() {
return allocationList.size() >= 3 && nonEmptyAllocationList.size() >= 1;
}
@Override
public Move next() {
AssetClassAllocation firstFrom;
AssetClassAllocation secondFrom;
int nonEmptyAllocationListSize = nonEmptyAllocationList.size();
if (nonEmptyAllocationListSize == 1) {
firstFrom = nonEmptyAllocationList.get(0);
secondFrom = firstFrom;
} else {
firstFrom = nonEmptyAllocationList.get(workingRandom.nextInt(nonEmptyAllocationListSize));
// secondFrom can be the same as firstFrom, for example in a split from 1 into 2 others
secondFrom = nonEmptyAllocationList.get(workingRandom.nextInt(nonEmptyAllocationListSize));
}
int allocationListSize = allocationList.size();
int toCandidateSize = allocationListSize - (firstFrom == secondFrom ? 1 : 2);
AssetClassAllocation firstTo = allocationList.get(workingRandom.nextInt(toCandidateSize));
if (firstTo == firstFrom) {
firstTo = allocationList.get(allocationListSize - 1);
} else if (firstTo == secondFrom) {
firstTo = allocationList.get(allocationListSize - 2);
}
// secondTo can be the same as firstTo, for example in a merge from 2 others into 1
AssetClassAllocation secondTo = allocationList.get(workingRandom.nextInt(toCandidateSize));
if (secondTo == firstFrom) {
secondTo = allocationList.get(allocationListSize - 1);
} else if (secondTo == secondFrom) {
secondTo = allocationList.get(allocationListSize - 2);
}
long firstTransferMillis = RandomUtils.nextLong(workingRandom, firstFrom.getQuantityMillis()) + 1L;
if (firstFrom == secondFrom && firstFrom.getQuantityMillis() == firstTransferMillis) {
// secondTransferMillis must never do a nextLong(0L) which would throw an IllegalArgumentException
firstTransferMillis--;
}
long secondTransferMillis = RandomUtils.nextLong(workingRandom, secondFrom.getQuantityMillis()
- (firstFrom == secondFrom ? firstTransferMillis : 0L)) + 1L;
return CompositeMove.buildMove(new InvestmentQuantityTransferMove(firstFrom, firstTo, firstTransferMillis),
new InvestmentQuantityTransferMove(secondFrom, secondTo, secondTransferMillis));
}
@Override
public void remove() {
throw new UnsupportedOperationException("The optional operation remove() is not supported.");
}
}
}