1 /**
2 * Licensed to jclouds, Inc. (jclouds) under one or more
3 * contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. jclouds licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. 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,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
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 }