org.apache.flume.lifecycle.LifecycleController Maven / Gradle / Ivy
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* 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.flume.lifecycle;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class LifecycleController {
private static final Logger logger = LoggerFactory
.getLogger(LifecycleController.class);
private static final long shortestSleepDuration = 50;
private static final int maxNumberOfChecks = 5;
public static boolean waitForState(LifecycleAware delegate,
LifecycleState state) throws InterruptedException {
return waitForState(delegate, state, 0);
}
public static boolean waitForState(LifecycleAware delegate,
LifecycleState state, long timeout) throws InterruptedException {
return waitForOneOf(delegate, new LifecycleState[] { state }, timeout);
}
public static boolean waitForOneOf(LifecycleAware delegate,
LifecycleState[] states) throws InterruptedException {
return waitForOneOf(delegate, states, 0);
}
public static boolean waitForOneOf(LifecycleAware delegate,
LifecycleState[] states, long timeout) throws InterruptedException {
if (logger.isDebugEnabled()) {
logger.debug("Waiting for state {} for delegate:{} up to {}ms",
new Object[] { states, delegate, timeout });
}
long sleepInterval = Math.max(shortestSleepDuration, timeout
/ maxNumberOfChecks);
long deadLine = System.currentTimeMillis() + timeout;
do {
for (LifecycleState state : states) {
if (delegate.getLifecycleState().equals(state)) {
return true;
}
}
Thread.sleep(sleepInterval);
} while (timeout == 0 || System.currentTimeMillis() < deadLine);
logger.debug("Didn't see {} state(s) within timeout of {}ms", states, timeout);
return false;
}
public static void stopAll(List services)
throws InterruptedException {
for (LifecycleAware service : services) {
waitForOneOf(service, LifecycleState.STOP_OR_ERROR);
}
}
}