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OpenFusion provides both general and service-specific instrumentation features which can be used for system monitoring, which in turn aids in problem identification, performance tuning, and so on. OpenFusion instrumentation consists of a set of properties that can be monitored at run time using the Administration Browser or SNMP.
In addition to properties that are read-only at runtime, OpenFusion provides some properties that can be set at runtime as required, such as when a particular threshold value is reached or a time period has elapsed. There is virtually no performance overhead involved in using any of the OpenFusion instrumentation features.
An OpenFusion manageable resource is a CORBA Singleton or Java Object that can be managed at runtime via SNMP.
The following CORBA Singletons are manageable resources:
The following Java Objects are manageable resources:
The Object Counters provided for each managed Singleton or Java Object (for example, the Number of Event Channels property of the NotificationSingleton) give a count of the number of objects in existence. The counter is incremented when an object is created and decremented when the object is destroyed.
The destruction of an object occurs during garbage collection, not when the object is de-referenced. Therefore, there will be a delay between an object being de-referenced and the counter registering that it has been destroyed.
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