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
015package org.apache.tapestry5.ioc.internal.services;
016
017import org.apache.tapestry5.ioc.Invokable;
018import org.apache.tapestry5.ioc.services.ParallelExecutor;
019
020import java.util.concurrent.ExecutionException;
021import java.util.concurrent.Future;
022import java.util.concurrent.TimeUnit;
023import 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 */
031public 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}