Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
PLANNER-1090 Multithreaded Local Search: accurate score calculation s…
…peed + shutdown + extract common classes to solver/thread package
- Loading branch information
Showing
4 changed files
with
104 additions
and
46 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
74 changes: 74 additions & 0 deletions
74
optaplanner-core/src/main/java/org/optaplanner/core/impl/solver/thread/ThreadUtils.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| /* | ||
| * Copyright 2018 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.thread; | ||
|
|
||
| import java.util.concurrent.ExecutorService; | ||
| import java.util.concurrent.TimeUnit; | ||
|
|
||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| public class ThreadUtils { | ||
|
|
||
| protected static final transient Logger logger = LoggerFactory.getLogger(ThreadUtils.class); | ||
|
|
||
| public static void shutdownAwaitOrKill(ExecutorService executor, String logIndentation, String name) { | ||
| // Intentionally clearing the interrupted flag so that awaitTermination() in step 3 works. | ||
| if (Thread.interrupted()) { | ||
| // 2a. If the current thread is interrupted, propagate interrupt signal to children by initiating | ||
| // an abrupt shutdown. | ||
| executor.shutdownNow(); | ||
| } else { | ||
| // 2b. Otherwise, initiate an orderly shutdown of the executor. This allows partition solvers to finish | ||
| // solving upon detecting the termination issued previously (step 1). Shutting down the executor | ||
| // service is important because the JVM cannot exit until all non-daemon threads have terminated. | ||
| executor.shutdown(); | ||
| } | ||
|
|
||
| // 3. Finally, wait until the executor finishes shutting down. | ||
| try { | ||
| final int awaitingSeconds = 1; | ||
| if (!executor.awaitTermination(awaitingSeconds, TimeUnit.SECONDS)) { | ||
| // Some solvers refused to complete. Busy threads will be interrupted in the finally block. | ||
| // We're only logging the error instead throwing an exception to prevent eating the original | ||
| // exception. | ||
| logger.error( | ||
| "{}{}'s ExecutorService didn't terminate within timeout ({} seconds).", | ||
| logIndentation, name, | ||
| awaitingSeconds); | ||
| } | ||
| } catch (InterruptedException e) { | ||
| // Interrupted while waiting for thread pool termination. Busy threads will be interrupted | ||
| // in the finally block. | ||
| Thread.currentThread().interrupt(); | ||
| // If there is an original exception it will be eaten by this. | ||
| throw new IllegalStateException("Thread pool termination was interrupted.", e); | ||
| } finally { | ||
| // Initiate an abrupt shutdown for the case when any of the previous measures failed. | ||
| executor.shutdownNow(); | ||
| } | ||
| } | ||
|
|
||
|
|
||
| // ************************************************************************ | ||
| // Private constructor | ||
| // ************************************************************************ | ||
|
|
||
| private ThreadUtils() { | ||
| } | ||
|
|
||
| } |