public void decideNextStep(LocalSearchStepScope localSearchStepScope) {
WorkingMemory workingMemory = localSearchStepScope.getWorkingMemory();
Iterator<Move> moveIterator = selector.moveIterator(localSearchStepScope);
while (moveIterator.hasNext()) {
Move move = moveIterator.next();
MoveScope moveScope = new MoveScope(localSearchStepScope);
moveScope.setMove(move);
// Filter out not doable moves
if (move.isMoveDoable(workingMemory)) {
doMove(moveScope);
if (forager.isQuitEarly()) {
break;
}
} else {
logger.debug(" Ignoring not doable move ({}).", move);
}
}
MoveScope pickedMoveScope = forager.pickMove(localSearchStepScope);
if (pickedMoveScope != null) {
Move step = pickedMoveScope.getMove();
localSearchStepScope.setStep(step);
if (logger.isInfoEnabled()) {
localSearchStepScope.setStepString(step.toString());
}
localSearchStepScope.setUndoStep(step.createUndoMove(workingMemory));
localSearchStepScope.setScore(pickedMoveScope.getScore());
}
}
private void processMove(MoveScope moveScope) {
Score score =
moveScope
.getLocalSearchStepScope()
.getLocalSearchSolverPhaseScope()
.calculateScoreFromWorkingMemory();
if (assertMoveScoreIsUncorrupted) {
moveScope
.getLocalSearchStepScope()
.getLocalSearchSolverPhaseScope()
.assertWorkingScore(score);
}
moveScope.setScore(score);
double acceptChance = acceptor.calculateAcceptChance(moveScope);
moveScope.setAcceptChance(acceptChance);
forager.addMove(moveScope);
}
private void doMove(MoveScope moveScope) {
WorkingMemory workingMemory = moveScope.getWorkingMemory();
Move move = moveScope.getMove();
Move undoMove = move.createUndoMove(workingMemory);
moveScope.setUndoMove(undoMove);
move.doMove(workingMemory);
processMove(moveScope);
undoMove.doMove(workingMemory);
if (assertUndoMoveIsUncorrupted) {
Score undoScore =
moveScope
.getLocalSearchStepScope()
.getLocalSearchSolverPhaseScope()
.calculateScoreFromWorkingMemory();
Score lastCompletedStepScore =
moveScope
.getLocalSearchStepScope()
.getLocalSearchSolverPhaseScope()
.getLastCompletedLocalSearchStepScope()
.getScore();
if (!undoScore.equals(lastCompletedStepScore)) {
throw new IllegalStateException(
"Corrupted undo move ("
+ undoMove
+ ") received from move ("
+ move
+ ").\n"
+ "Unequal lastCompletedStepScore ("
+ lastCompletedStepScore
+ ") and undoScore ("
+ undoScore
+ ").\n"
+ moveScope
.getLocalSearchStepScope()
.getLocalSearchSolverPhaseScope()
.getSolverScope()
.getSolutionDirector()
.buildConstraintOccurrenceSummary());
}
}
logger.debug(
" Move score ({}), accept chance ({}) for move ({}).",
new Object[] {moveScope.getScore(), moveScope.getAcceptChance(), moveScope.getMove()});
}
