| /* |
| * 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.livy.rsc.driver; |
| |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.CancellationException; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Future; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.livy.Job; |
| |
| public class JobWrapper<T> implements Callable<Void> { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(JobWrapper.class); |
| |
| public final String jobId; |
| |
| private final RSCDriver driver; |
| |
| private final Job<T> job; |
| |
| private boolean isCancelled = false; |
| |
| private Future<?> future; |
| |
| public JobWrapper(RSCDriver driver, String jobId, Job<T> job) { |
| this.driver = driver; |
| this.jobId = jobId; |
| this.job = job; |
| } |
| |
| @Override |
| public Void call() throws Exception { |
| try { |
| // this is synchronized to avoid races with cancel() |
| synchronized (this) { |
| if (isCancelled) { |
| throw new CancellationException("Job has been cancelled"); |
| } else { |
| driver.jobContext().sc().setJobGroup(jobId, "", true); |
| } |
| } |
| |
| jobStarted(); |
| T result = job.call(driver.jobContext()); |
| finished(result, null); |
| } catch (Throwable t) { |
| // Catch throwables in a best-effort to report job status back to the client. It's |
| // re-thrown so that the executor can destroy the affected thread (or the JVM can |
| // die or whatever would happen if the throwable bubbled up). |
| LOG.info("Failed to run job " + jobId, t); |
| finished(null, t); |
| throw new ExecutionException(t); |
| } finally { |
| driver.activeJobs.remove(jobId); |
| } |
| return null; |
| } |
| |
| synchronized void submit(ExecutorService executor) { |
| if (!isCancelled) { |
| this.future = executor.submit(this); |
| } |
| } |
| |
| synchronized boolean cancel() { |
| if (isCancelled) { |
| return false; |
| } else { |
| isCancelled = true; |
| driver.jobContext().sc().cancelJobGroup(jobId); |
| return future != null ? future.cancel(true) : true; |
| } |
| } |
| |
| protected void finished(T result, Throwable error) { |
| if (error == null) { |
| driver.jobFinished(jobId, result, null); |
| } else { |
| driver.jobFinished(jobId, null, error); |
| } |
| } |
| |
| protected void jobStarted() { |
| driver.jobStarted(jobId); |
| } |
| |
| } |