| /** |
| * 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 javax.enterprise.concurrent; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.Callable; |
| |
| public class ManagedExecutors { |
| public static final String NULL_TASK_ERROR_MSG = "Task cannot be null"; |
| |
| public static boolean isCurrentThreadShutdown() { |
| final Thread currThread = Thread.currentThread(); |
| return currThread instanceof ManageableThread && ManageableThread.class.cast(currThread).isShutdown(); |
| } |
| |
| public static Runnable managedTask(final Runnable task, final ManagedTaskListener taskListener) |
| throws IllegalArgumentException { |
| return managedTask(task, null, taskListener); |
| } |
| |
| public static Runnable managedTask(final Runnable task, final Map<String, String> executionProperties, |
| final ManagedTaskListener taskListener) throws IllegalArgumentException { |
| if (task == null) { |
| throw new IllegalArgumentException(NULL_TASK_ERROR_MSG); |
| } |
| return new RunnableAdapter(task, executionProperties, taskListener); |
| } |
| |
| public static <V> Callable<V> managedTask(final Callable<V> task, final ManagedTaskListener taskListener) |
| throws IllegalArgumentException { |
| return managedTask(task, null, taskListener); |
| } |
| |
| public static <V> Callable<V> managedTask(final Callable<V> task, |
| final Map<String, String> executionProperties, |
| final ManagedTaskListener taskListener) throws IllegalArgumentException { |
| if (task == null) { |
| throw new IllegalArgumentException(NULL_TASK_ERROR_MSG); |
| } |
| return new CallableAdapter<V>(task, executionProperties, taskListener); |
| } |
| |
| private static final class RunnableAdapter extends Adapter implements Runnable { |
| private final Runnable task; |
| |
| public RunnableAdapter(final Runnable task, final Map<String, String> executionProperties, |
| final ManagedTaskListener taskListener) { |
| super(taskListener, executionProperties, ManagedTask.class.isInstance(task) ? ManagedTask.class.cast(task) : null); |
| this.task = task; |
| } |
| |
| @Override |
| public void run() { |
| task.run(); |
| } |
| |
| } |
| |
| /** |
| * Adapter for Callable to include ManagedTask interface methods |
| */ |
| private static final class CallableAdapter<V> extends Adapter implements Callable<V> { |
| private final Callable<V> task; |
| |
| public CallableAdapter(final Callable<V> task, final Map<String, String> executionProperties, |
| final ManagedTaskListener taskListener) { |
| super(taskListener, executionProperties, ManagedTask.class.isInstance(task) ? ManagedTask.class.cast(task) : null); |
| this.task = task; |
| } |
| |
| @Override |
| public V call() throws Exception { |
| return task.call(); |
| } |
| |
| } |
| |
| private static class Adapter implements ManagedTask { |
| protected final ManagedTaskListener taskListener; |
| protected final Map<String, String> executionProperties; |
| protected final ManagedTask managedTask; |
| |
| public Adapter(ManagedTaskListener taskListener, Map<String, String> executionProperties, ManagedTask managedTask) { |
| this.taskListener = taskListener; |
| this.managedTask = managedTask; |
| this.executionProperties = |
| initExecutionProperties(managedTask == null? null: managedTask.getExecutionProperties(), |
| executionProperties); |
| } |
| |
| @Override |
| public ManagedTaskListener getManagedTaskListener() { |
| if (taskListener != null) { |
| return taskListener; |
| } |
| if (managedTask != null) { |
| return managedTask.getManagedTaskListener(); |
| } |
| return null; |
| } |
| |
| @Override |
| public Map<String, String> getExecutionProperties() { |
| if (executionProperties != null) { |
| return executionProperties; |
| } |
| return null; |
| } |
| |
| private static Map<String, String> initExecutionProperties(final Map<String, String> base, |
| final Map<String, String> override) { |
| if (base == null && override == null) { |
| return null; |
| } |
| |
| final Map<String, String> props = new HashMap<String, String>(); |
| if (base != null) { |
| props.putAll(base); |
| } |
| if (override != null) { |
| props.putAll(override); |
| } |
| return props; |
| } |
| |
| } |
| |
| private ManagedExecutors() { |
| // no-op |
| } |
| } |
| |