/*
* JBoss, Home of Professional Open Source
* Copyright 2015, Red Hat, Inc. and/or its affiliates, and individual
* contributors by the @authors tag. See the copyright.txt in the
* distribution for a full listing of individual contributors.
*
* 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 org.jboss.as.quickstarts.managedexecutorservice.concurrency;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.logging.Logger;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import org.jboss.as.quickstarts.managedexecutorservice.model.Product;
//This class simulates a long running task that could take many seconds to be executed.
public class LongRunningTask implements Callable<Integer> {
@Inject
private Logger log;
@Inject
private EntityManager entityManager;
@Override
@SuppressWarnings("unchecked")
public Integer call() throws Exception {
// here we simulate an access to Products listing
List<Product> products = (List<Product>) entityManager.createQuery("SELECT p FROM Product p").getResultList();
log.info("Starting a long running task");
for (Product product : products) {
log.info("Analysing " + product.getName());
// We simulate now a long running task
Thread.sleep(3000);
}
// after executing a long running task we return a result
return (int) (Math.random() * 100);
}
}