org.opennms.netmgt.poller.monitors

Class AvailabilityMonitor

java.lang.Object

org.opennms.netmgt.poller.monitors.AbstractServiceMonitor

org.opennms.netmgt.poller.monitors.AvailabilityMonitor

All Implemented Interfaces:

ServiceMonitor

@Distributable
public class AvailabilityMonitor
extends AbstractServiceMonitor

This class uses the Java 5 isReachable method to determine up/down and is currently considered "experimental". Please give it a try and let us know.

Version:

$Id: $

Author:

David Hustace

Field Summary

Fields

Modifier and Type	Field and Description
static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor and Description
AvailabilityMonitor()

Method Summary

Modifier and Type	Method and Description
void	initialize(Map<String,Object> parameters) This method is called after the framework creates an instance of the plug-in.
void	initialize(MonitoredService svc) initialize
PollStatus	poll(MonitoredService svc, Map<String,Object> parameters) This method is the heart of the plug-in monitor.
void	release() release
void	release(MonitoredService svc) This method is the called whenever an interface is being removed from the scheduler.

Methods inherited from class org.opennms.netmgt.poller.monitors.AbstractServiceMonitor

getKeyedBoolean, getKeyedInteger, getKeyedLong, getKeyedObject, getKeyedString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

public static final org.slf4j.Logger LOG

Constructor Detail

AvailabilityMonitor

public AvailabilityMonitor()

Method Detail

initialize

public void initialize(Map<String,Object> parameters)

This method is called after the framework creates an instance of the plug-in. The framework passes the object a proxy object that can be used to retrieve configuration information specific to the plug-in. Additionally, any parameters for the plug-in from the package definition are passed using the parameters element.

If there is a critical error, like missing service libraries, the the Monitor may throw a ServiceMonitorException. If the plug-in throws an exception then the plug-in will be disabled in the framework.

This method is called after the framework creates an instance of the plug-in. The framework passes the object a proxy object that can be used to retrieve configuration information specific to the plug-in. Additionally, any parameters for the plug-in from the package definition are passed using the parameters element.

If there is a critical error, like missing service libraries, the monitor may throw a ServiceMonitorException. If the plug-in throws an exception then the plug-in will be disabled in the framework.

Specified by:

initialize in interface ServiceMonitor

Overrides:

initialize in class AbstractServiceMonitor

Parameters:

parameters - Not currently used

initialize

public void initialize(MonitoredService svc)

initialize

Specified by:

initialize in interface ServiceMonitor

Overrides:

initialize in class AbstractServiceMonitor

Parameters:

svc - a MonitoredService object.

poll

public PollStatus poll(MonitoredService svc,
                       Map<String,Object> parameters)

This method is the heart of the plug-in monitor. Each time an interface requires a check to be performed as defined by the scheduler the poll method is invoked. The poll is passed the interface to check

By default when the status transition from up to down or vice versa the framework will generate an event. Additionally, if the polling interval changes due to an extended unavailability, the framework will generate an additional down event. The plug-in can suppress the generation of the default events by setting the suppress event bit in the returned integer.

Specified by:

poll in interface ServiceMonitor

Specified by:

poll in class AbstractServiceMonitor

Parameters:

svc - TODO

parameters - The package parameters (timeout, retry, etc...) to be used for this poll.

Returns:

The availability of the interface and if a transition event should be suppressed.

See Also:

PollStatus.SERVICE_AVAILABLE, PollStatus.SERVICE_UNAVAILABLE, PollStatus.SERVICE_AVAILABLE, PollStatus.SERVICE_UNAVAILABLE

release

public void release()

release

Specified by:

release in interface ServiceMonitor

Overrides:

release in class AbstractServiceMonitor

release

public void release(MonitoredService svc)

This method is the called whenever an interface is being removed from the scheduler. For example, if a service is determined as being no longer supported then this method will be invoked to cleanup any information associated with this device. This gives the implementor of the interface the ability to serialize any data prior to the interface being discarded.

If an exception is thrown during the release the exception will be logged, but the interface will still be discarded for garbage collection.

This method is the called whenever an interface is being removed from the scheduler. For example, if a service is determined as being no longer supported then this method will be invoked to cleanup any information associated with this device. This gives the implementor of the interface the ability to serialize any data prior to the interface being discarded.

If an exception is thrown during the release the exception will be logged, but the interface will still be discarded for garbage collection.

Specified by:

release in interface ServiceMonitor

Overrides:

release in class AbstractServiceMonitor

Parameters:

svc - TODO