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// ========================================================================
// Copyright (c) Webtide LLC
// ------------------------------------------------------------------------
// 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 java.util.Arrays;
import java.util.List;
import org.eclipse.jetty.monitor.jmx.EventState;
import org.eclipse.jetty.monitor.jmx.EventTrigger;
/* ------------------------------------------------------------ */
/**
* AndEventTrigger
*
* EventTrigger aggregation using logical OR operation
* that executes matching of the aggregated event triggers
* in left to right order
*/
public class OrEventTrigger
extends EventTrigger
{
private final List<EventTrigger> _triggers;
/* ------------------------------------------------------------ */
/**
* Construct an event trigger and associate the list
* of event triggers to be aggregated by this trigger
*
* @param triggers list of event triggers to add
*/
public OrEventTrigger(List<EventTrigger> triggers)
{
_triggers = triggers;
}
/* ------------------------------------------------------------ */
/**
* Construct an event trigger and associate the array
* of event triggers to be aggregated by this trigger
*
* @param triggers array of event triggers to add
*/
public OrEventTrigger(EventTrigger... triggers)
{
_triggers = Arrays.asList(triggers);
}
/* ------------------------------------------------------------ */
/**
* Verify if the event trigger conditions are in the
* appropriate state for an event to be triggered.
* This event trigger will match if any of aggregated
* event triggers would return a match.
*
* @see org.eclipse.jetty.monitor.jmx.EventTrigger#match(long)
*/
public boolean match(long timestamp)
throws Exception
{
for(EventTrigger trigger : _triggers)
{
if (trigger.match(timestamp))
return true;
}
return false;
}
/* ------------------------------------------------------------ */
/**
* Retrieve the event state associated with specified invocation
* of the event trigger match method. This event trigger retrieves
* the combined event state of all aggregated event triggers.
*
* @param timestamp time stamp associated with invocation
* @return event state or null if not found
*
* @see org.eclipse.jetty.monitor.jmx.EventTrigger#getState(long)
*/
@Override
@SuppressWarnings("unchecked")
public EventState getState(long timestamp)
{
EventState state = new EventState();
for (EventTrigger trigger : _triggers)
{
EventState subState = trigger.getState(timestamp);
if (subState!=null)
{
state.addAll(subState.values());
}
}
return state;
}
/* ------------------------------------------------------------ */
/**
* Returns the string representation of this event trigger
* in the format "OR(triger1,trigger2,...)".
*
* @return string representation of the event trigger
*
* @see java.lang.Object#toString()
*/
public String toString()
{
int cnt = 0;
StringBuilder result = new StringBuilder();
result.append("OR(");
for (EventTrigger trigger : _triggers)
{
result.append(cnt++ > 0 ? "," : "");
result.append(trigger);
}
result.append(')');
return result.toString();
}
}
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