com.netflix.archaius.config.polling.ManualPollingStrategy Maven / Gradle / Ivy
/**
* Copyright 2015 Netflix, Inc.
*
* 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.netflix.archaius.config.polling;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import com.netflix.archaius.api.config.PollingStrategy;
import com.netflix.archaius.util.ThreadFactories;
/**
* Polling strategy using external input to trigger a refresh. This should only be used
* for testing.
*
* @author elandau
*
*/
public class ManualPollingStrategy implements PollingStrategy {
private final ExecutorService executor = Executors.newSingleThreadExecutor(ThreadFactories.newNamedDaemonThreadFactory("Archaius-Poller-%d"));
private final LinkedBlockingQueue queue = new LinkedBlockingQueue();
private static class Request {
CountDownLatch latch = new CountDownLatch(1);
Exception error;
}
@Override
public Future execute(final Runnable run) {
return executor.submit(new Runnable() {
@Override
public void run() {
Request request;
try {
while (null != (request = queue.take())) {
try {
run.run();
} catch (Exception e) {
request.error = e;
} finally {
request.latch.countDown();
}
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
});
}
public void fire(long timeout, TimeUnit units) throws Exception {
Request request = new Request();
queue.put(request);
request.latch.await(timeout, units);
if (request.error != null) {
throw request.error;
}
}
public void fire() throws Exception {
Request request = new Request();
queue.put(request);
request.latch.await();
if (request.error != null) {
throw request.error;
}
}
@Override
public void shutdown() {
executor.shutdown();
}
}