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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// Licensed 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 com.google.devtools.build.lib.vfs;
import com.google.devtools.build.lib.testutil.TestUtils;
import com.google.devtools.build.lib.vfs.util.FileSystems;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.io.File;
import java.io.IOException;
/**
* (Slow) tests of FileSystem under concurrency.
*
* These tests are nondeterministic but provide good coverage nonetheless.
*/
@RunWith(JUnit4.class)
public class FileSystemConcurrencyTest {
Path workingDir;
@Before
public final void initializeFileSystem() throws Exception {
FileSystem testFS = FileSystems.getNativeFileSystem();
// Resolve symbolic links in the temp dir:
workingDir = testFS.getPath(new File(TestUtils.tmpDir()).getCanonicalPath());
}
@Test
public void testConcurrentSymlinkModifications() throws Exception {
final Path xFile = workingDir.getRelative("file");
FileSystemUtils.createEmptyFile(xFile);
final Path xLinkToFile = workingDir.getRelative("link");
// "Boxed" for pass-by-reference.
final boolean[] run = { true };
final IOException[] exception = { null };
Thread createThread = new Thread() {
@Override
public void run() {
while (run[0]) {
if (!xLinkToFile.exists()) {
try {
xLinkToFile.createSymbolicLink(xFile);
} catch (IOException e) {
exception[0] = e;
return;
}
}
}
}
};
Thread deleteThread = new Thread() {
@Override
public void run() {
while (run[0]) {
if (xLinkToFile.exists(Symlinks.NOFOLLOW)) {
try {
xLinkToFile.delete();
} catch (IOException e) {
exception[0] = e;
return;
}
}
}
}
};
createThread.start();
deleteThread.start();
Thread.sleep(1000);
run[0] = false;
createThread.join(0);
deleteThread.join(0);
if (exception[0] != null) {
throw exception[0];
}
}
}
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