/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.hadoop.util;
import junit.framework.TestCase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.util.AsyncDiskService;
/**
* A test for AsyncDiskService.
*/
public class TestAsyncDiskService extends TestCase {
public static final Log LOG = LogFactory.getLog(TestAsyncDiskService.class);
// Access by multiple threads from the ThreadPools in AsyncDiskService.
volatile int count;
/** An example task for incrementing a counter.
*/
class ExampleTask implements Runnable {
ExampleTask() {
}
@Override
public void run() {
synchronized (TestAsyncDiskService.this) {
count ++;
}
}
};
/**
* This test creates some ExampleTasks and runs them.
*/
public void testAsyncDiskService() throws Throwable {
String[] vols = new String[]{"/0", "/1"};
AsyncDiskService service = new AsyncDiskService(vols);
int total = 100;
for (int i = 0; i < total; i++) {
service.execute(vols[i%2], new ExampleTask());
}
Exception e = null;
try {
service.execute("no_such_volume", new ExampleTask());
} catch (RuntimeException ex) {
e = ex;
}
assertNotNull("Executing a task on a non-existing volume should throw an "
+ "Exception.", e);
service.shutdown();
if (!service.awaitTermination(5000)) {
fail("AsyncDiskService didn't shutdown in 5 seconds.");
}
assertEquals(total, count);
}
}