net.java.truevfs.ext.pacemaker.PaceManagerView Maven / Gradle / Ivy

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Constrains the number of concurrently mounted archive file systems in order to save some heap space. This module provides a JMX interface for monitoring and management. 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 © 2005 - 2021 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package net.java.truevfs.ext.pacemaker;

import net.java.truevfs.comp.jmx.JmxManagerView;

import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;

/**
 * A view for a {@link PaceManager}.
 * This class is thread-safe.
 *
 * @author Christian Schlichtherle
 */
final class PaceManagerView extends JmxManagerView implements PaceManagerMXBean {

    public PaceManagerView(PaceManager manager) {
        super(manager, PaceManagerMXBean.class);
    }

    @Override
    protected String getDescription(MBeanInfo info) {
        return "A pace maker for the file system manager.";
    }

    @Override
    protected String getDescription(MBeanAttributeInfo info) {
        return "MaximumFileSystemsMounted".equals(info.getName())
                ? "The maximum number of mounted file systems."
                : super.getDescription(info);
    }

    @Override
    public int getMaximumFileSystemsMounted() {
        return manager.getMaximumSize();
    }

    @Override
    public void setMaximumFileSystemsMounted(int maxMounted) {
        manager.setMaximumSize(maxMounted);
    }
}