/*
* JBoss, the OpenSource EJB server
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package javax.management.monitor;

import javax.management.ObjectName;

/**
 * The monitor service MBean interface. <p>
 *
 * @author <a href="mailto:Adrian.Brock@HappeningTimes.com">Adrian Brock</a>
 * @version $Revision: 1.5 $
 */
public interface MonitorMBean
{
   // Constants -----------------------------------------------------

   // Static --------------------------------------------------------

   // Public --------------------------------------------------------

   /**
    * Starts the monitor.
    */
   public void start();

   /**
    * Stops the monitor.
    */
   public void stop();

   /**
    * Add the object name of the MBean monitored.<p>
    *
    * @param object the object name.
    */
   public void addObservedObject(ObjectName object)
           throws IllegalArgumentException;

   /**
    * Remove the object name of the MBean monitored.<p>
    *
    * @param object the object name.
    */
   public void removeObservedObject(ObjectName object);

   /**
    * Checks whether the object name is monitored.<p>
    *
    * @param object the object name.
    * @return true when it is monitored.
    */
   public boolean containsObservedObject(ObjectName object);

   /**
    * Retrieves the object names of the MBeans monitored.
    *
    * @return the object names.
    */
   public ObjectName[] getObservedObjects();

   /**
    * Retrieves the object name of the MBean monitored.
    *
    * @return the object name.
    * @deprecated use {@link #getObservedObjects()}
    */
   public ObjectName getObservedObject();

   /**
    * Sets the object name of the MBean monitored.<p>
    * <p/>
    * The default value is null.
    *
    * @param object the object name.
    * @deprecated use {@link #addObservedObject(ObjectName)}
    */
   public void setObservedObject(ObjectName object);

   /**
    * Retrieves the name of the attribute monitored.
    *
    * @return the attribute monitored.
    */
   public String getObservedAttribute();

   /**
    * Sets the name of the attribute monitored.<p>
    * <p/>
    * The default value is null.
    *
    * @param attribute the attribute monitored.
    * @throws IllegalArgumentException when the period is not positive.
    */
   public void setObservedAttribute(String attribute);

   /**
    * Retrieves the granularity period in milliseconds.<p>
    * <p/>
    * The monitoring takes place once per granularity period.
    *
    * @return the granularity period.
    */
   public long getGranularityPeriod();

   /**
    * Sets the granularity period in milliseconds.<p>
    * <p/>
    * The monitoring takes place once per granularity period.<p>
    * <p/>
    * The default value is 10 seconds.
    *
    * @param period the granularity period.
    * @throws IllegalArgumentException when the period is not positive.
    */
   public void setGranularityPeriod(long period)
           throws IllegalArgumentException;

   /**
    * Tests whether this monitoring service is active.
    *
    * @return true when the service is active, false otherwise.
    */
   public boolean isActive();

}