/*
 * @(#)MonitorMBean.java	4.23 04/05/18
 * 
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.management.monitor; 

// jmx imports
//
import javax.management.ObjectName;

/**
 * Exposes the remote management interface of monitor MBeans.
 *
 * @version     4.23     05/18/04
 * @author      Sun Microsystems, Inc
 *
 * @since 1.5
 */
public interface MonitorMBean { 
    
    /**
     * Starts the monitor.
     */
    public void start();
    
    /**
     * Stops the monitor.
     */
    public void stop();
    
    // GETTERS AND SETTERS
    //-------------------- 
    
    /**
     * Adds the specified object in the set of observed MBeans.
     *
     * @param object The object to observe.
     * @exception java.lang.IllegalArgumentException the specified object is null.
     *
     * @since.unbundled JMX 1.2
     */
    public void addObservedObject(ObjectName object) throws java.lang.IllegalArgumentException;
    
    /**
     * Removes the specified object from the set of observed MBeans.
     *
     * @param object The object to remove.
     *
     * @since.unbundled JMX 1.2
     */
    public void removeObservedObject(ObjectName object);
    
    /**
     * Tests whether the specified object is in the set of observed MBeans.
     *
     * @param object The object to check.
     * @return <CODE>true</CODE> if the specified object is in the set, <CODE>false</CODE> otherwise.
     *
     * @since.unbundled JMX 1.2
     */
    public boolean containsObservedObject(ObjectName object);
    
    /**
     * Returns an array containing the objects being observed.
     *
     * @return The objects being observed.
     *
     * @since.unbundled JMX 1.2
     */
    public ObjectName[] getObservedObjects();   
    
    /**
     * Gets the object name of the object being observed.
     *
     * @return The object being observed.
     *
     * @see #setObservedObject
     *
     * @deprecated As of JMX 1.2, replaced by {@link #getObservedObjects}
     */
    @Deprecated
    public ObjectName getObservedObject();
    
    /**
     * Sets the object to observe identified by its object name.
     *
     * @param object The object to observe.
     *
     * @see #getObservedObject
     *
     * @deprecated As of JMX 1.2, replaced by {@link #addObservedObject}
     */
    @Deprecated
    public void setObservedObject(ObjectName object);
    
    /**
     * Gets the attribute being observed.
     *
     * @return The attribute being observed.
     *
     * @see #setObservedAttribute
     */
    public String getObservedAttribute();
    
    /**
     * Sets the attribute to observe.
     *
     * @param attribute The attribute to observe.
     *
     * @see #getObservedAttribute
     */
    public void setObservedAttribute(String attribute);
        
    /**
     * Gets the granularity period (in milliseconds).
     *
     * @return The granularity period.
     *
     * @see #setGranularityPeriod
     */
    public long getGranularityPeriod();
    
    /**
     * Sets the granularity period (in milliseconds).
     *
     * @param period The granularity period.
     * @exception java.lang.IllegalArgumentException The granularity
     * period is less than or equal to zero.
     *
     * @see #getGranularityPeriod
     */
    public void setGranularityPeriod(long period) throws java.lang.IllegalArgumentException;
    
    /**
     * Tests if the monitor MBean is active.
     * A monitor MBean is marked active when the {@link #start start} method is called.
     * It becomes inactive when the {@link #stop stop} method is called.
     *
     * @return <CODE>true</CODE> if the monitor MBean is active, <CODE>false</CODE> otherwise.
     */
    public boolean isActive();
}