//
// 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 com.cloud.utils.backoff.impl;
import java.util.HashMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Assert;
import org.junit.Test;
public class ConstantTimeBackoffTest {
final static private Log LOG = LogFactory.getLog(ConstantTimeBackoffTest.class);
@Test
public void waitBeforeRetryWithInterrupt() throws InterruptedException {
final ConstantTimeBackoff backoff = new ConstantTimeBackoff();
backoff.setTimeToWait(10);
Assert.assertTrue(backoff.getWaiters().isEmpty());
Thread waitThread = new Thread(new Runnable() {
@Override
public void run() {
backoff.waitBeforeRetry();
}
});
waitThread.start();
Thread.sleep(100);
Assert.assertFalse(backoff.getWaiters().isEmpty());
waitThread.interrupt();
Thread.sleep(100);
Assert.assertTrue(backoff.getWaiters().isEmpty());
}
@Test
public void waitBeforeRetry() throws InterruptedException {
final ConstantTimeBackoff backoff = new ConstantTimeBackoff();
// let's not wait too much in a test
backoff.setTimeToWait(0);
// check if the list of waiters is empty
Assert.assertTrue(backoff.getWaiters().isEmpty());
// call the waitBeforeRetry which will wait 0 ms and return
backoff.waitBeforeRetry();
// on normal exit the list of waiters should be cleared
Assert.assertTrue(backoff.getWaiters().isEmpty());
}
@Test
public void configureEmpty() {
// at this point this is the only way rhe configure method gets invoked,
// therefore have to make sure it works correctly
final ConstantTimeBackoff backoff = new ConstantTimeBackoff();
backoff.configure("foo", new HashMap<String, Object>());
Assert.assertEquals(5000, backoff.getTimeToWait());
}
@Test
public void configureWithValue() {
final ConstantTimeBackoff backoff = new ConstantTimeBackoff();
HashMap<String, Object> params = new HashMap<String, Object>();
params.put("seconds", "100");
backoff.configure("foo", params);
Assert.assertEquals(100000, backoff.getTimeToWait());
}
/**
* Test that wakeup returns false when trying to wake a non existing thread.
*/
@Test
public void wakeupNotExisting() {
final ConstantTimeBackoff backoff = new ConstantTimeBackoff();
Assert.assertFalse(backoff.wakeup("NOT EXISTING THREAD"));
}
/**
* Test that wakeup will return true if the thread is waiting.
*/
@Test
public void wakeupExisting() throws InterruptedException {
final ConstantTimeBackoff backoff = new ConstantTimeBackoff();
backoff.setTimeToWait(10);
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
LOG.debug("before");
backoff.waitBeforeRetry();
LOG.debug("after");
}
});
thread.start();
LOG.debug("thread started");
Thread.sleep(100);
LOG.debug("testing wakeup");
Assert.assertTrue(backoff.wakeup(thread.getName()));
}
}