1 /**
2 *
3 * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com>
4 *
5 * ====================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 * ====================================================================
18 */
19 package org.jclouds.lifecycle;
20
21 import java.io.Closeable;
22 import java.io.IOException;
23 import java.util.Collections;
24 import java.util.List;
25
26 import javax.inject.Singleton;
27
28 import com.google.common.collect.Lists;
29
30 /**
31 * This will close objects in the reverse order that they were added.
32 *
33 * @author Adrian Cole
34 */
35 @Singleton
36 public class Closer implements Closeable {
37 // guice is single threaded. no need to lock this
38 List<Closeable> methodsToClose = Lists.<Closeable> newArrayList();
39
40 public void addToClose(Closeable toClose) {
41 methodsToClose.add(toClose);
42 }
43
44 public void close() throws IOException {
45 Collections.reverse(methodsToClose);
46 for (Closeable toClose : methodsToClose) {
47 toClose.close();
48 }
49 }
50 }