    001    // Copyright 2009 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    //     http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5.ioc.internal.services;
    016
    017    import org.apache.tapestry5.ioc.Invokable;
    018    import org.apache.tapestry5.ioc.services.ParallelExecutor;
    019
    020    import java.util.concurrent.ExecutionException;
    021    import java.util.concurrent.Future;
    022    import java.util.concurrent.TimeUnit;
    023    import java.util.concurrent.TimeoutException;
    024
    025    /**
    026     * Implementation of {@link ParallelExecutor} used when {@linkplain org.apache.tapestry5.ioc.IOCSymbols#THREAD_POOL_ENABLED
    027     * the thread pool is disabled}.
    028     *
    029     * @since 5.1.0.3
    030     */
    031    public class NonParallelExecutor implements ParallelExecutor
    032    {
    033        public <T> Future<T> invoke(Invokable<T> invocable)
    034        {
    035            final T result = invocable.invoke();
    036
    037            return new Future<T>()
    038            {
    039                public boolean cancel(boolean mayInterruptIfRunning)
    040                {
    041                    return false;
    042                }
    043
    044                public boolean isCancelled()
    045                {
    046                    return false;
    047                }
    048
    049                public boolean isDone()
    050                {
    051                    return true;
    052                }
    053
    054                public T get() throws InterruptedException, ExecutionException
    055                {
    056                    return result;
    057                }
    058
    059                public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
    060                {
    061                    return result;
    062                }
    063            };
    064        }
    065
    066        public <T> T invoke(Class<T> proxyType, Invokable<T> invocable)
    067        {
    068            return invocable.invoke();
    069        }
    070    }