com.sun.sgs.impl.profile.listener
Class AccessedObjectsListener

java.lang.Object
  com.sun.sgs.impl.profile.listener.AccessedObjectsListener

All Implemented Interfaces:

ProfileListener

public class AccessedObjectsListener
extends Object
implements ProfileListener

An implementation of ProfileListener that prints access detail. For any transaction that fails due to conflict this will display the accesses for that transaction and the accesses, if known, for the transaction that caused the conflict.

Note that in the current default implementation, conflict detail will only be provided if the AccessCoordinator is using a backlog to track finished transactions. See TrackingAccessCoordinator for more detail.

By default, the set of accesses displayed for a given transaction will be limited to the first 20. This can be changed by setting the com.sun.sgs.impl.profile.listener.AccessedObjectsListener.access.count property with a positive integer value.

Field Summary

static String

ACCESS_COUNT_PROPERTY Property that defines the maximum number of accesses to display.

Fields inherited from interface com.sun.sgs.profile.ProfileListener

WINDOW_SIZE_PROPERTY

Constructor Summary

AccessedObjectsListener(Properties properties, Identity owner, ComponentRegistry registry)
Creates an instance of AccessedObjectsListener.

Method Summary

void	propertyChange(PropertyChangeEvent event) Notifies this listener of a new change in the system properties.
void	report(ProfileReport profileReport) Reports a completed task that has been run through the scheduler.
void	shutdown() Tells this listener that the system is shutting down.

Methods inherited from class java.lang.Object

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

Field Detail

ACCESS_COUNT_PROPERTY

public static final String ACCESS_COUNT_PROPERTY

Property that defines the maximum number of accesses to display.

Constructor Detail

AccessedObjectsListener

public AccessedObjectsListener(Properties properties,
                               Identity owner,
                               ComponentRegistry registry)

Creates an instance of AccessedObjectsListener.

Parameters:

properties - the Properties for this listener

owner - the Identity to use for all tasks run by this listener

registry - the ComponentRegistry containing the available system components

Throws:

IllegalArgumentException - if either of the backlog or count properties is provided but invalid

Method Detail

propertyChange

public void propertyChange(PropertyChangeEvent event)

Notifies this listener of a new change in the system properties. This method is called for any property that changes.

The current list of supported property names is as follows:

name	description	new value	old value
com.sun.sgs.profile.newop	a new operation is registered with the system.	the new operation : ProfileOperation	null
com.sun.sgs.profile.threadcount	the number of threads in the system has changed.	the current number of threads : Integer	the previous number of threads : Integer
com.sun.sgs.profile.nodeid	the local node has been assigned a unique identifier	the identifier for the local node: Long	null

Specified by:

propertyChange in interface ProfileListener

Parameters:

event - A PropertyChangeEvent object describing the name of the property, its old and new values and the source of the change.

report

public void report(ProfileReport profileReport)

Reports a completed task that has been run through the scheduler. The task may have completed successfully or may have failed. If a task is re-tried, then this method will be called multiple times for each re-try of the same task. Note that in this case the scheduledStartTime will remain constant but the actualStartTime will change for each re-try of the same task.

Specified by:

report in interface ProfileListener

Parameters:

profileReport - the ProfileReport for the task

shutdown

public void shutdown()

Tells this listener that the system is shutting down.

Specified by:

shutdown in interface ProfileListener