/*
* Copyright 2002-2016 the original author or authors.
*
* 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 org.springframework.integration.file.tail;
import static org.junit.Assert.assertFalse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Test;
import org.junit.rules.TestWatcher;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
/**
* Ignores tests annotated with {@link TailAvailable} if 'tail' with the requested options
* does not work on this platform.
* @author Gary Russell
* @since 3.0
*
*/
public class TailRule extends TestWatcher {
private static final Log logger = LogFactory.getLog(TailRule.class);
private static final String tmpDir = System.getProperty("java.io.tmpdir");
private final String commandToTest;
public TailRule(String optionsToTest) {
this.commandToTest = "tail " + optionsToTest + " ";
}
@Override
public Statement apply(Statement base, Description description) {
if (description.getAnnotation(TailAvailable.class) != null) {
if (!tailWorksOnThisMachine()) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
// skip
}
};
}
}
return super.apply(base, description);
}
private boolean tailWorksOnThisMachine() {
if (tmpDir.contains(":")) {
return false;
}
File testDir = new File(tmpDir, "FileTailingMessageProducerTests");
testDir.mkdir();
final File file = new File(testDir, "foo");
int result = -99;
try {
OutputStream fos = new FileOutputStream(file);
fos.write("foo".getBytes());
fos.close();
final AtomicReference<Integer> c = new AtomicReference<Integer>();
final CountDownLatch latch = new CountDownLatch(1);
Future<Process> future = Executors.newSingleThreadExecutor().submit(() -> {
final Process process = Runtime.getRuntime().exec(commandToTest + " " + file.getAbsolutePath());
Executors.newSingleThreadExecutor().execute(() -> {
try {
c.set(process.getInputStream().read());
latch.countDown();
}
catch (IOException e) {
logger.error("Error reading test stream", e);
}
});
return process;
});
try {
Process process = future.get(10, TimeUnit.SECONDS);
if (latch.await(10, TimeUnit.SECONDS)) {
Integer read = c.get();
if (read != null && read == 'f') {
result = 0;
}
}
process.destroy();
}
catch (ExecutionException e) {
result = -999;
}
file.delete();
}
catch (Exception e) {
logger.error("failed to test tail", e);
}
if (result != 0) {
logger.warn("tail command is not available on this platform; result:" + result);
}
return result == 0;
}
public static class TestRule {
@Test
public void test1() {
TailRule rule = new TailRule("-BLAH");
assertFalse(rule.tailWorksOnThisMachine());
}
}
}