Package com.sun.enterprise.admin.monitor.stats

Provides for implementations of various Stats interfaces. These Stats interfaces are based on those defined by JSR 77.

See:
Description

Interface Summary

AverageRangeStatistic
ConnectionFactoryStats
ConnectionPoolStats	A Stats interface to represent the statistical data exposed by a Connection Pool.
ConnectorConnectionPoolStats	A Stats interface to represent the statistical data exposed by a Connector Connection Pool.
ConnectorEndPointFactoryStats	A Stats interface to represent the statistical data about Endpoint factory in the Connector Module
ConnectorWorkMgmtStats	A Stats interface to represent the statistical data about Work Management in the Connector Module
EJBCacheStats	A Stats interface to represent the statistics exposed by the Enterprise Bean Cache.
EJBMethodStats	A Stats interface to represent the statistical data exposed by an EJB Business Method.
EJBPoolStats	A Stats interface to represent the statistical data exposed by an EJB Bean Pool.
HAStatefulSessionStoreStats
HTTPListenerStats	A Stats interface to represent the statistical data exposed by an HTTP Listener.
JDBCConnectionPoolStats	A Stats interface to represent the statistical data exposed by a JDBC Connection Pool.
JTAStats	Defines additional Sun ONE Application Server specific statistic to transaction service.
JVMClassLoadingStats	A Stats interface, to expose the monitoring information about the JVM Classloading subsystem
JVMCompilationStats	A Stats interface, to expose the monitoring information about the JVM Compilation subsystem
JVMGarbageCollectorStats	A Stats interface, to expose the monitoring information about the JVM Garbage Collection subsystem
JVMMemoryStats	A Stats interface, to expose the monitoring information about the JVM memory subsystem.
JVMOperatingSystemStats	A Stats interface, to expose information about the Operating system on which the JVM is running
JVMRuntimeStats	A Stats interface to expose information about the JVM Runtime
JVMThreadInfoStats	A Stats interface, to expose the monitoring information about each individual thread in the the thread system of the JVM.
JVMThreadStats	A Stats interface, to expose the monitoring information about the thread system of the JVM.
MutableCountStatistic	An interface that imparts mutability to a CountStatistic by the virtue of extending MutableStatistic.
MutableStatistic	An interface that gives a flexibility to set various values for a particular Statistic.
MutableTimeStatistic	Provides mutable nature to the TimeStatistic.
OrbConnectionManagerStats	Stats interface for the monitorable attributes of the ORBConnectionManager This combines the statistics that were exposed in 7.0 with the new ones.
PWCConnectionQueueStats	ConnectionQueue information shows the number of sessions in the queue and the average delay before the connection is accepted
PWCDnsStats	The DNS Cache caches IP addresses and DNS names.
PWCFileCacheStats	Provides statistical information on the httpservice file cache
PWCHttpServiceStats	Contains Statistical Information for the HttpService
PWCKeepAliveStats	Provides statistical information about the HttpService HTTP-level keep-alive system
PWCRequestStats	Interface representing statistical information about the request bucket
PWCThreadPoolStats	Returns the statistical information associated with the HttpService thread pool
PWCVirtualServerStats	Statistical information relevant to a virtual server
ServletStats	Defines additional Sun ONE Application Server specific statistics ServletStats interface.
StatefulSessionStoreStats
StringStatistic	Custom statistic type created for the Sun ONE Application Server.
ThreadPoolStats	Stats interface for the monitorable attributes of the a generic ThreadPool.
TimerServiceStats	A Stats interface to represent the statistical data exposed by the Ejb Timer Service.
WebModuleStats	Interface for querying web module statistics.

Class Summary

AverageRangeStatisticImpl
BoundaryStatisticImpl	An implementation of a BoundaryStatistic.
BoundedRangeStatisticImpl	An implementation of a BoundedRangeStatistic.
CountStatisticImpl	An implementation of a CountStatistic.
GenericStatsImpl	Provides for generic implementation of any Stats interface.
MutableAverageRangeStatisticImpl
MutableBoundedRangeStatisticImpl	An implementation of MutableCountStatistic that provides ways to change the state externally through mutators.
MutableCountStatisticImpl	An implementation of MutableCountStatistic that provides ways to change the state externally through mutators.
MutableTimeStatisticImpl	An implementation of MutableTimeStatistic that eases the various statistical calculations.
RangeStatisticImpl	An implementation of a RangeStatistic.
StatisticImpl	An abstract class providing implementation of the Statistic interface The intent is for this to be subclassed by all the StatisticImpls.
StringStatisticImpl	A basic implementation of the StringStatistic Interface.
TimeStatisticImpl	An implementation of a TimeStatistic.

Package com.sun.enterprise.admin.monitor.stats Description

Provides for implementations of various Stats interfaces. These Stats interfaces are based on those defined by JSR 77. Besides this, implementations of various Statistic interfaces are also provided here. A new Statistic is introduced named StringStatistic .

When we analyze the Statistic interfaces that are defined by the J2EE Management Standard, it is evident that they are view-only data structures providing the accessors for various statistical data, e.g. CountStatistic. Every instance of CountStatistic is allowed to have only a getCount method (in addition to other meta data accessors), that returns a long. This limits the usability of these Statistic interfaces by the actual components that gather the data, because new instances of these interfaces have to be constructed as and when a query or measurement of that statistic is made. On the other hand, it is much more flexible to have mutators within implementations of these Statistic interfaces. But then, there is a possibility that the client who receives instances of these interfaces inadvertantly changes a particular statistic.

To solve this problem, this package makes the following provision:

It defines Statistic classes that have a State. A component that gathers data has to do the following:

• Implement the specific Stats interface. e.g. EJBCacheStats. This interface has a method which returns number of beans in cache as an instance of BoundedRangeStatistic.
• Initialize an instance of MutableBoundedRangeStatistic with an initial state. This interface exposes all the necessary methods that are required to reflect the change in state.
• Since MutableBoundedRangeStatistic provides a method that returns an unmodifiable view of itself, calls the MutableBoundedRangeStatistic.unmodifiableView() which returns BoundedRangeStatistic. This returned value can safely be sent to the caller to which everything is transparent.

Note that these Mutable* interfaces/classes are not exposed to clients. Clients will only receive instances of Statistics that are part of the J2EE Management Standard.

Package Specification

Following Stats interfaces are part of this package. All of these extend the org.glassfish.j2ee.statistics.Stats interface.

• EJBCacheStats
• EJBMethodStats
• EJBPoolStats
• OrbConnectionManagerStats
• OrbThreadPoolStats
• SunOneJVMStats

Following new Statistic interfaces are defined by this package. They extend the org.glassfish.j2ee.statistics.Statististic interface.

• StringStatistic - A String equivalent of CountStatistic.
• MutableStatistic - A Statistic that has some mutators. It is expected to be handled with care.
• MutableCountStatistic - A CountStatistic/BoundedRangeStatistic that is mutable.
• MutableTimeStatistic - A TimeStatistic that is mutable.

Following are the implementations of various Statistic interfaces in org.glassfish.j2ee.statistics package.

Interface	Immutable Implementation (read-only -- for clients)	Mutable Implementation (read-write -- for core components)
CountStatistic	CountStatisticImpl	MutableCountStatisticImpl It implements MutableCountStatistic.
BoundedRangeStatistic	BoundedRangeStatisticImpl	MutableBoundedRangeStatisticImpl It implements MutableCountStatistic.
TimeStatistic	TimeStatisticImpl	MutableTimeStatisticImpl It implements MutableTimeStatistic.

Following is a helper implementation done in this package: GenericStatsImpl.

This class is designed to facilitate the general implementation of Stats interface and all the classes that implement this interface can leverage this class. The main idea is that this class implements:

• getStatistic(String)
• getStatistics()
• getStatisticNames()

in a reflective manner. Thus, e.g. a specific implementation of EJBPoolStats like EJBPoolStatsImpl can make use of this class to implement above methods in a generic manner.

Related Documentation

org.glassfish.j2ee.statistics
Collections.unmodifiableMap(java.util.Map)
Collections.unmodifiableSet(java.util.Set)

@since S1AS8.0