de.schlichtherle.io.JSE5Executor Maven / Gradle / Ivy

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TrueZIP is a Java based Virtual File System (VFS) to enable transparent, multi-threaded read/write access to archive files (ZIP, TAR etc.) as if they were directories. Archive files may be arbitrarily nested and the nesting level is only limited by heap and file system size.

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/*
 * Copyright (C) 2006-2010 Schlichtherle IT Services
 *
 * Licensed 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 de.schlichtherle.io;

import java.util.concurrent.*;

/**
 * @author Christian Schlichtherle
 * @version $Id: JSE5Executor.java,v 1.5 2010/09/21 14:06:45 christian_schlichtherle Exp $
 * @since TrueZIP 6.4
 */
final class JSE5Executor implements Executor {
    private final ExecutorService service;

    /**
     * Constructs a new {@code JSE5Executor}.
     * This constructor is public in order to enable reflective access!
     */
    public JSE5Executor(final String threadName) {
        assert threadName != null;
        class ThreadFactory implements java.util.concurrent.ThreadFactory {
            public Thread newThread(final Runnable r) {
                final Thread t = new Thread(r, threadName);
                t.setDaemon(true);
                return t;
            }
        }
        service = Executors.newCachedThreadPool(new ThreadFactory());
    }

    public Task submit(final Runnable target) {
        assert target != null;
        return new JSE5Task(service.submit(target));
    }

    private static final class JSE5Task implements Task {
        private final Future future;

        private JSE5Task(final Future future) {
            assert future != null;
            this.future = future;
        }

        public void cancel() {
            future.cancel(true);
            while (true) {
                try {
                    future.get();
                    break;
                } catch (CancellationException cancelled) {
                    break;
                } catch (ExecutionException readerFailure) {
                    assert false : readerFailure;
                    break;
                } catch (InterruptedException ignored) {
                }
            }
        }
    }
}