de.schlichtherle.truezip.fs.inst.jmx.JmxModelView 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 static de.schlichtherle.truezip.entry.Entry.Access.*;
import de.schlichtherle.truezip.entry.Entry.Size;
import static de.schlichtherle.truezip.entry.Entry.Size.DATA;
import static de.schlichtherle.truezip.entry.Entry.Size.STORAGE;
import static de.schlichtherle.truezip.entry.Entry.UNKNOWN;
import de.schlichtherle.truezip.fs.*;
import de.schlichtherle.truezip.fs.sl.FsDriverLocator;
import de.schlichtherle.truezip.fs.sl.FsManagerLocator;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.util.Date;
import javax.annotation.CheckForNull;
import javax.management.*;

/**
 * The MXBean implementation for a {@link FsModel file system model}.
 *
 * @author  Christian Schlichtherle
 */
final class JmxModelView
extends StandardMBean
implements JmxModelViewMXBean {

    private static final MBeanServer
            mbs = ManagementFactory.getPlatformMBeanServer();
    private static final FsCompositeDriver
            DRIVER = new FsSimpleCompositeDriver(FsDriverLocator.SINGLETON);

    private final FsModel model;

    static JmxModelViewMXBean register(final FsModel model) {
        final ObjectName name = getObjectName(model);
        final JmxModelViewMXBean view = new JmxModelView(model);
        try {
            try {
                mbs.registerMBean(view, name);
                return view;
            } catch (InstanceAlreadyExistsException ignored) {
                return JMX.newMXBeanProxy(mbs, name, JmxModelViewMXBean.class);
            }
        } catch (RuntimeException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new IllegalArgumentException(ex);
        }
    }

    static void unregister(final FsModel model) {
        final ObjectName name = getObjectName(model);
        try {
            try {
                mbs.unregisterMBean(name);
            } catch (InstanceNotFoundException ignored) {
            }
        } catch (RuntimeException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new IllegalArgumentException(ex);
        }
    }

    private static ObjectName getObjectName(final FsModel model) {
        final String path = model.getMountPoint().toHierarchicalUri().toString();
        try {
            return new ObjectName(  FsModel.class.getName(),
                                    "path",
                                    ObjectName.quote(path));
        } catch (MalformedObjectNameException ex) {
            throw new AssertionError(ex);
        }
    }

    private JmxModelView(FsModel model) {
        super(JmxModelViewMXBean.class, true);
        this.model = model;
    }

    @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
    protected String getDescription(MBeanInfo info) {
        return "A file system model.";
    }

    @Override
    protected String getDescription(MBeanAttributeInfo info) {
        final String name = info.getName();
        String description = null;
        if (name.equals("MountPoint")) {
            description = "The mount point URI of this file system.";
        } else if (name.equals("Mounted")) {
            description = "Whether or not this file system needs to get sync()ed.";
        } else if (name.equals("ParentMountPoint")) {
            description = "The mount point URI of the parent file system.";
        } else if (name.equals("SizeOfData")) {
            description = "The data size of this file system.";
        } else if (name.equals("SizeOfStorage")) {
            description = "The storage size of this file system.";
        } else if (name.equals("TimeWritten")) {
            description = "The last write time of this file system.";
        } else if (name.equals("TimeRead")) {
            description = "The last read or access time of this file system.";
        } else if (name.equals("TimeCreated")) {
            description = "The creation time of this file system.";
        }
        return description;
    }

    /**
     * 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) {
        String description = null;
        if (info.getName().equals("sync")) {
            description = "Synchronizes this file system and all enclosed file systems. If any file system is busy with I/O, an FsSyncException is thrown.";
        }
        return description;
    }

    @Override
    public boolean isMounted() {
        return model.isMounted();
    }

    @Override
    public String getMountPoint() {
        return model.getMountPoint().toString();
    }

    @Override
    public String getParentMountPoint() {
        final FsModel parent = model.getParent();
        return null != parent ? parent.getMountPoint().toString() : null;
    }

    @Override
    public long getSizeOfData() {
        return sizeOf(DATA);
    }

    @Override
    public long getSizeOfStorage() {
        return sizeOf(STORAGE);
    }

    private long sizeOf(Size type) {
        final FsEntry entry = getEntry();
        return null == entry ? UNKNOWN : entry.getSize(type);
    }

    @Override
    public String getTimeWritten() {
        final FsEntry entry = getEntry();
        final long time = null == entry ? UNKNOWN : entry.getTime(WRITE);
        return UNKNOWN == time ? null : new Date(time).toString();
    }

    @Override
    public String getTimeRead() {
        final FsEntry entry = getEntry();
        final long time = null == entry ? UNKNOWN : entry.getTime(READ);
        return UNKNOWN == time ? null : new Date(time).toString();
    }

    @Override
    public String getTimeCreated() {
        final FsEntry entry = getEntry();
        final long time = null == entry ? UNKNOWN : entry.getTime(CREATE);
        return UNKNOWN == time ? null : new Date(time).toString();
    }

    private @CheckForNull FsEntry getEntry() {
        final FsMountPoint mp = model.getMountPoint();
        final FsMountPoint pmp = mp.getParent();
        try {
            final FsManager m = FsManagerLocator.SINGLETON.get();
            return null == pmp
                    ? m.getController(mp, DRIVER)
                        .getEntry(FsEntryName.ROOT)
                    : m.getController(pmp, DRIVER)
                        .getEntry(mp.getPath().getEntryName());
        } catch (IOException ex) {
            return null;
        }
    }

    @Override
    public void sync() throws FsSyncException {
        new FsFilteringManager( FsManagerLocator.SINGLETON.get(),
                                model.getMountPoint())
                .sync(FsSyncOptions.NONE);
    }
}