| /* |
| * 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; |
| |
| import java.util.List; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| |
| import io.netty.util.concurrent.Promise; |
| |
| import org.apache.livy.JobHandle; |
| import org.apache.livy.client.common.AbstractJobHandle; |
| |
| /** |
| * A handle to a submitted job. Allows for monitoring and controlling of the running remote job. |
| */ |
| class JobHandleImpl<T> extends AbstractJobHandle<T> { |
| |
| private final RSCClient client; |
| private final String jobId; |
| private final Promise<T> promise; |
| private volatile State state; |
| |
| JobHandleImpl(RSCClient client, Promise<T> promise, String jobId) { |
| this.client = client; |
| this.jobId = jobId; |
| this.promise = promise; |
| } |
| |
| /** Requests a running job to be cancelled. */ |
| @Override |
| public boolean cancel(boolean mayInterrupt) { |
| if (changeState(State.CANCELLED)) { |
| client.cancel(jobId); |
| promise.cancel(mayInterrupt); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public T get() throws ExecutionException, InterruptedException { |
| return promise.get(); |
| } |
| |
| @Override |
| public T get(long timeout, TimeUnit unit) |
| throws ExecutionException, InterruptedException, TimeoutException { |
| return promise.get(timeout, unit); |
| } |
| |
| @Override |
| public boolean isCancelled() { |
| return promise.isCancelled(); |
| } |
| |
| @Override |
| public boolean isDone() { |
| return promise.isDone(); |
| } |
| |
| @Override |
| protected T result() { |
| return promise.getNow(); |
| } |
| |
| @Override |
| protected Throwable error() { |
| return promise.cause(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| void setSuccess(Object result) { |
| // The synchronization here is not necessary, but tests depend on it. |
| synchronized (listeners) { |
| promise.setSuccess((T) result); |
| changeState(State.SUCCEEDED); |
| } |
| } |
| |
| void setFailure(Throwable error) { |
| // The synchronization here is not necessary, but tests depend on it. |
| synchronized (listeners) { |
| promise.setFailure(error); |
| changeState(State.FAILED); |
| } |
| } |
| |
| } |