| /* |
| * 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.ignite.compute; |
| |
| import java.util.concurrent.Callable; |
| import org.apache.ignite.internal.util.typedef.internal.A; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * Convenience adapter for {@link ComputeJob} implementations. It provides the |
| * following functionality: |
| * <ul> |
| * <li> |
| * Default implementation of {@link ComputeJob#cancel()} method and ability |
| * to check whether cancellation occurred with {@link #isCancelled()} method. |
| * </li> |
| * <li> |
| * Ability to set and get job arguments via {@link #setArguments(Object...)} |
| * and {@link #argument(int)} methods. |
| * </li> |
| * </ul> |
| */ |
| public abstract class ComputeJobAdapter implements ComputeJob, Callable<Object> { |
| /** */ |
| private static final long serialVersionUID = 0L; |
| |
| /** Job argument. */ |
| private Object[] args; |
| |
| /** Cancellation flag. */ |
| private transient volatile boolean cancelled; |
| |
| /** |
| * No-arg constructor. |
| */ |
| protected ComputeJobAdapter() { |
| /* No-op. */ |
| } |
| |
| /** |
| * Creates job with one arguments. This constructor exists for better |
| * backward compatibility with internal Ignite 2.x code. |
| * |
| * @param arg Job argument. |
| */ |
| protected ComputeJobAdapter(@Nullable Object arg) { |
| args = new Object[]{arg}; |
| } |
| |
| /** |
| * Creates job with specified arguments. |
| * |
| * @param args Optional job arguments. |
| */ |
| protected ComputeJobAdapter(@Nullable Object... args) { |
| this.args = args; |
| } |
| |
| /** |
| * Sets given arguments. |
| * |
| * @param args Optional job arguments to set. |
| */ |
| public void setArguments(@Nullable Object... args) { |
| this.args = args; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void cancel() { |
| cancelled = true; |
| } |
| |
| /** |
| * This method tests whether or not this job was cancelled. This method |
| * is thread-safe and can be called without extra synchronization. |
| * <p> |
| * This method can be periodically called in {@link ComputeJob#execute()} method |
| * implementation to check whether or not this job cancelled. Note that system |
| * calls {@link #cancel()} method only as a hint and this is a responsibility of |
| * the implementation of the job to properly cancel its execution. |
| * |
| * @return {@code true} if this job was cancelled, {@code false} otherwise. |
| */ |
| protected final boolean isCancelled() { |
| return cancelled; |
| } |
| |
| /** |
| * Gets job argument. |
| * |
| * @param idx Index of the argument. |
| * @param <T> Type of the argument to return. |
| * @return Job argument. |
| * @throws NullPointerException Thrown in case when there no arguments set. |
| * @throws IllegalArgumentException Thrown if index is invalid. |
| */ |
| @Nullable public <T> T argument(int idx) { |
| A.notNull(args, "args"); |
| A.ensure(idx >= 0 && idx < args.length, "idx >= 0 && idx < args.length"); |
| |
| return (T)args[idx]; |
| } |
| |
| /** |
| * Gets array of job arguments. Note that changes to this array may |
| * affect job execution. |
| * |
| * @return Array of job arguments. |
| */ |
| @Nullable protected Object[] arguments() { |
| return args; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public final Object call() { |
| return execute(); |
| } |
| } |