1 /*
2  * Copyright (C) 2009 The Android Open Source Project
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 android.os.cts;
18 
19 import static org.junit.Assert.fail;
20 
21 import android.os.ParcelFileDescriptor;
22 import android.os.ParcelFileDescriptor.AutoCloseOutputStream;
23 import android.platform.test.annotations.AppModeSdkSandbox;
24 
25 import androidx.test.runner.AndroidJUnit4;
26 
27 import org.junit.Test;
28 import org.junit.runner.RunWith;
29 
30 import java.io.FileOutputStream;
31 import java.io.IOException;
32 import java.lang.ref.Reference;
33 import java.nio.channels.FileLock;
34 
35 @AppModeSdkSandbox(reason = "Allow test in the SDK sandbox (does not prevent other modes).")
36 @RunWith(AndroidJUnit4.class)
37 public class ParcelFileDescriptor_AutoCloseOutputStreamTest {
38     @Test
testAutoCloseOutputStream()39     public void testAutoCloseOutputStream() throws Exception {
40         ParcelFileDescriptor pf = ParcelFileDescriptorTest.makeParcelFileDescriptor();
41 
42         AutoCloseOutputStream out = new AutoCloseOutputStream(pf);
43 
44         out.write(2);
45 
46         out.close();
47 
48         try {
49             out.write(2);
50             fail("Failed to throw exception.");
51         } catch (IOException e) {
52             // expected
53         }
54     }
55 
56     @Test
testCloseOrdering()57     public void testCloseOrdering() throws Exception {
58         // b/118316956: Make sure that we close the OutputStream before we close the PFD.
59         ParcelFileDescriptor pfd = ParcelFileDescriptorTest.makeParcelFileDescriptor();
60         FileLock l = null;
61         try (FileOutputStream out = new AutoCloseOutputStream(pfd)) {
62             l = out.getChannel().lock();
63         } finally {
64             Reference.reachabilityFence(l);
65         }
66     }
67 }
68