de.schlichtherle.truezip.extension.pace.PaceManagerView Maven / Gradle / Ivy

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This module constrains the number of mounted archive files in order to save some heap space. It 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 (C) 2005-2015 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package de.schlichtherle.truezip.extension.pace;

import de.schlichtherle.truezip.fs.FsController;
import de.schlichtherle.truezip.fs.FsManager;
import de.schlichtherle.truezip.fs.FsSyncException;
import de.schlichtherle.truezip.fs.FsSyncOptions;
import javax.annotation.concurrent.ThreadSafe;
import javax.management.*;

/**
 * The pace manager view.
 *
 * @author Christian Schlichtherle
 */
@ThreadSafe
final class PaceManagerView extends StandardMBean implements PaceManager {

    private final PaceManagerModel model;
    private volatile PaceManagerController controller;

    PaceManagerView(final PaceManagerModel model) {
        super(PaceManager.class, true);
        this.model = model;
    }

    FsManager decorate(final FsManager manager) {
        assert !(manager instanceof PaceManagerController);
        final PaceManagerController o = controller;
        final PaceManagerModel m = null == o ? model : new PaceManagerModel();
        final PaceManagerController n = new PaceManagerController(m, manager);
        if (null == o) controller = n;
        return n;
    }

    @Override
    public MBeanInfo getMBeanInfo() {
        MBeanInfo mbinfo = super.getMBeanInfo();
        return new MBeanInfo(mbinfo.getClassName(),
                mbinfo.getDescription(),
                mbinfo.getAttributes(),
                mbinfo.getConstructors(),
                mbinfo.getOperations(),
                getNotificationInfo());
    }

    public MBeanNotificationInfo[] getNotificationInfo() {
        return new MBeanNotificationInfo[]{};
    }

    /**
     * Override customization hook:
     * You can supply a customized description for MBeanInfo.getDescription()
     */
    @Override
    protected String getDescription(MBeanInfo info) {
        return "A pace manager";
    }

    /**
     * Override customization hook:
     * You can supply a customized description for MBeanAttributeInfo.getDescription()
     */
    @Override
    protected String getDescription(MBeanAttributeInfo info) {
        final String name = info.getName();
        if (name.equals("FileSystemsMounted")) {
            return "The number of mounted file systems.";
        } else if (name.equals("FileSystemsTotal")) {
            return "The total number of file systems.";
        } else if (name.equals("MaximumFileSystemsMounted")) {
            return "The maximum number of mounted file systems.";
        } else if (name.equals("TopLevelArchiveFileSystemsMounted")) {
            return "The number of mounted top level archive file systems.";
        } else if (name.equals("TopLevelArchiveFileSystemsTotal")) {
            return "The total number of top level archive file systems.";
        }
        return null;
    }

    /**
     * Override customization hook:
     * You can supply a customized description for MBeanParameterInfo.getDescription()
     */
    @Override
    protected String getDescription(MBeanOperationInfo op, MBeanParameterInfo param, int sequence) {
        return null;
    }

    /**
     * Override customization hook:
     * You can supply a customized description for MBeanParameterInfo.getName()
     */
    @Override
    protected String getParameterName(MBeanOperationInfo op, MBeanParameterInfo param, int sequence) {
        return null;
    }

    /**
     * Override customization hook:
     * You can supply a customized description for MBeanOperationInfo.getDescription()
     */
    @Override
    protected String getDescription(MBeanOperationInfo info) {
        if (info.getName().equals("sync"))
            return "Synchronizes all file systems.";
        return null;
    }

    @Override
    public void sync() throws FsSyncException {
        if (null != controller) controller.sync(FsSyncOptions.NONE);
    }

    @Override
    public int getFileSystemsTotal() {
        return null == controller ? 0 : controller.getSize();
    }

    @Override
    public int getFileSystemsMounted() {
        return model.getFileSystemsMounted();
    }

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

    @Override
    public void setMaximumFileSystemsMounted(int value) {
        model.setMaximumFileSystemsMounted(value);
    }

    @Override
    public int getTopLevelArchiveFileSystemsTotal() {
        int total = 0;
        if (null != controller)
            for (final FsController c : controller)
                if (isTopLevelArchive(c)) total++;
        return total;
    }

    @Override
    public int getTopLevelArchiveFileSystemsMounted() {
        int mounted = 0;
        if (null != controller)
            for (final FsController c : controller)
                if (isTopLevelArchive(c))
                    if (c.getModel().isMounted()) mounted++;
        return mounted;
    }

    private boolean isTopLevelArchive(final FsController c) {
        final FsController parent = c.getParent();
        return null != parent && null == parent.getParent();
    }
}