/*
* Copyright (C) 2012-2014 DataStax 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.datastax.driver.stress;
import java.util.Iterator;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.ResultSetFuture;
import com.datastax.driver.core.Session;
import static com.google.common.util.concurrent.Uninterruptibles.awaitUninterruptibly;
public class AsynchronousConsumer implements Consumer {
private static final ExecutorService executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
private final CountDownLatch shutdownLatch = new CountDownLatch(1);
private final Session session;
private final QueryGenerator requests;
private final Reporter reporter;
public AsynchronousConsumer(Session session,
QueryGenerator requests,
Reporter reporter) {
this.session = session;
this.requests = requests;
this.reporter = reporter;
}
@Override
public void start() {
executorService.execute(new Runnable() {
@Override
public void run() {
request();
}
});
}
private void request() {
if (!requests.hasNext()) {
shutdown();
return;
}
handle(requests.next());
}
@Override
public void join() {
awaitUninterruptibly(shutdownLatch);
}
protected void handle(QueryGenerator.Request request) {
final Reporter.Context ctx = reporter.newRequest();
ResultSetFuture resultSetFuture = request.executeAsync(session);
Futures.addCallback(resultSetFuture, new FutureCallback<ResultSet>() {
@Override
public void onSuccess(final ResultSet result) {
ctx.done();
request();
}
@Override
public void onFailure(final Throwable t) {
// Could do better I suppose
System.err.println("Error during request: " + t);
ctx.done();
request();
}
}, executorService);
}
protected void shutdown() {
shutdownLatch.countDown();
}
}