de.schlichtherle.truezip.fs.inst.InstrumentingIOPool Maven / Gradle / Ivy

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This module provides a file system manager and an I/O pool service for managing and monitoring TrueZIP via JMX and java.util.logging. Add the JAR artifact of this module to the run time class path to make its services available for service location in the client API modules.

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/*
 * Copyright (C) 2005-2015 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package de.schlichtherle.truezip.fs.inst;

import de.schlichtherle.truezip.entry.DecoratingEntry;
import de.schlichtherle.truezip.socket.IOPool;
import de.schlichtherle.truezip.socket.IOPool.Entry;
import de.schlichtherle.truezip.socket.InputSocket;
import de.schlichtherle.truezip.socket.OutputSocket;
import java.io.IOException;
import javax.annotation.concurrent.Immutable;

/**
 * @param    the type of the I/O buffers.
 * @param    the type of the instrumenting director.
 * @author  Christian Schlichtherle
 */
@Immutable
public class InstrumentingIOPool<
        E extends Entry,
        D extends InstrumentingDirector>
implements IOPool {

    protected final D director;
    protected final IOPool delegate;

    public InstrumentingIOPool(final IOPool pool, final D director) {
        if (null == pool || null == director)
            throw new NullPointerException();
        this.director = director;
        this.delegate = pool;
    }

    @Override
    public Entry allocate() throws IOException {
        return new Buffer(delegate.allocate());
    }

    @Override
    public void release(Entry resource) throws IOException {
        resource.release();
    }

    @Override
    public String toString() {
        return String.format("%s[delegate=%s]", getClass().getName(), delegate);
    }

    @SuppressWarnings("PublicInnerClass")
    public class Buffer
    extends DecoratingEntry>
    implements Entry {

        protected Buffer(Entry delegate) {
            super(delegate);
        }

        @Override
        public InputSocket getInputSocket() {
            return director.instrument(delegate.getInputSocket(), this);
        }

        @Override
        public OutputSocket getOutputSocket() {
            return director.instrument(delegate.getOutputSocket(), this);
        }

        @Override
        public void release() throws IOException {
            delegate.release();
        }
    } // Buffer
}