de.schlichtherle.truezip.fs.inst.jmx.JmxSeekableByteChannel 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.jmx;

import de.schlichtherle.truezip.io.DecoratingSeekableByteChannel;
import edu.umd.cs.findbugs.annotations.CreatesObligation;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SeekableByteChannel;
import javax.annotation.WillCloseWhenClosed;
import javax.annotation.concurrent.NotThreadSafe;

/**
 * @author  Christian Schlichtherle
 */
@NotThreadSafe
final class JmxSeekableByteChannel extends DecoratingSeekableByteChannel {
    private final JmxIOStatistics stats;

    @CreatesObligation
    @edu.umd.cs.findbugs.annotations.SuppressWarnings("OBL_UNSATISFIED_OBLIGATION")
    JmxSeekableByteChannel(@WillCloseWhenClosed SeekableByteChannel sbc, JmxIOStatistics stats) {
        super(sbc);
        assert null != stats;
        this.stats = stats;
    }

    @Override
    public int read(ByteBuffer buf) throws IOException {
        int ret = delegate.read(buf);
        if (0 < ret)
            stats.incBytesRead(ret);
        return ret;
    }

    @Override
    public int write(ByteBuffer buf) throws IOException {
        int ret = delegate.write(buf);
        stats.incBytesWritten(ret);
        return ret;
    }
}