| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.logging.log4j.core; |
| |
| import com.google.common.io.ByteStreams; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import static org.junit.Assert.assertTrue; |
| |
| public final class GarbageCollectionHelper implements Closeable, Runnable { |
| private static final OutputStream sink = ByteStreams.nullOutputStream(); |
| private final AtomicBoolean running = new AtomicBoolean(); |
| private final CountDownLatch latch = new CountDownLatch(1); |
| private final Thread gcThread = new Thread(new Runnable() { |
| @Override |
| public void run() { |
| try { |
| while (running.get()) { |
| // Allocate data to help suggest a GC |
| try { |
| // 1mb of heap |
| sink.write(new byte[1024 * 1024]); |
| } catch (IOException ignored) { |
| } |
| // May no-op depending on the jvm configuration |
| System.gc(); |
| } |
| } finally { |
| latch.countDown(); |
| } |
| } |
| }); |
| |
| @Override |
| public void run() { |
| if (running.compareAndSet(false, true)) { |
| gcThread.start(); |
| } |
| } |
| |
| @Override |
| public void close() { |
| running.set(false); |
| try { |
| assertTrue("GarbageCollectionHelper did not shut down cleanly", |
| latch.await(10, TimeUnit.SECONDS)); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |