1 /***
2 * Copyright 2003-2010 Terracotta, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package net.sf.ehcache.constructs.nonstop;
18
19 import org.slf4j.Logger;
20 import org.slf4j.LoggerFactory;
21
22 import java.util.concurrent.Callable;
23
24 public class BlockingCallable implements Callable<Void> {
25
26 private static final Logger LOG = LoggerFactory.getLogger(BlockingCallable.class);
27
28 private final boolean logExecution;
29 private final Object monitor = new Object();
30 private volatile boolean blocked = true;
31
32 public BlockingCallable() {
33 this(false);
34 }
35
36 public BlockingCallable(boolean logExecution) {
37 this.logExecution = logExecution;
38 }
39
40 public Void call() throws Exception {
41 if (logExecution) {
42 LOG.info("inside blocking callable");
43 }
44 while (blocked) {
45 synchronized (monitor) {
46 monitor.wait();
47 }
48 }
49 return null;
50 }
51
52 public void unblock() {
53 synchronized (monitor) {
54 blocked = false;
55 monitor.notifyAll();
56 }
57 }
58
59 }