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//
// ========================================================================
// Copyright (c) 1995-2012 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.monitor.triggers;
import javax.management.MalformedObjectNameException;
/* ------------------------------------------------------------ */
/**
* LessThanAttrEventTrigger
*
* Event trigger that polls a value of an MXBean attribute and
* checks if it is greater than specified max value.
*/
public class LessThanAttrEventTrigger<TYPE extends Comparable<TYPE>> extends AttrEventTrigger<TYPE>
{
protected final TYPE _max;
/* ------------------------------------------------------------ */
/**
* Construct event trigger and specify the MXBean attribute
* that will be polled by this event trigger as well as max
* value of the attribute.
*
* @param objectName object name of an MBean to be polled
* @param attributeName name of an MBean attribute to be polled
* @param max maximum value of the attribute
*
* @throws MalformedObjectNameException
* @throws IllegalArgumentException
*/
public LessThanAttrEventTrigger(String objectName, String attributeName, TYPE max)
throws MalformedObjectNameException, IllegalArgumentException
{
super(objectName,attributeName);
if (max == null)
throw new IllegalArgumentException("Value cannot be null");
_max = max;
}
/* ------------------------------------------------------------ */
/**
* Compare the value of the MXBean attribute being polling
* to check if it is less than the min value.
*
* @see org.eclipse.jetty.monitor.triggers.AttrEventTrigger#match(java.lang.Comparable)
*/
@Override
public boolean match(Comparable<TYPE> value)
{
return (value.compareTo(_max) < 0);
}
/* ------------------------------------------------------------ */
/**
* Returns the string representation of this event trigger
* in the format "name<max".
*
* @return string representation of the event trigger
*
* @see java.lang.Object#toString()
*/
public String toString()
{
StringBuilder result = new StringBuilder();
result.append(getNameString());
result.append("<");
result.append(_max);
return result.toString();
}
}
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