GemFire 8.2.6

Package com.gemstone.gemfire

The base package of the GemFire Java product, featuring highly concurrent distributed caching with cache event delivery, OQL querying, and remote cache administration, built using a DistributedSystem which includes a DistributedLockService.

See: Description

Package com.gemstone.gemfire Description

The base package of the GemFire Java product, featuring highly concurrent distributed caching with cache event delivery, OQL querying, and remote cache administration, built using a DistributedSystem which includes a DistributedLockService.

This package contains classes that are used throughout GemFire, providing enhanced serialization performance using the DataSerializable feature and the ability to profile your GemFire application using a handy Statistics infrastructure.

GemFire Statistics

The ability to monitor and analyze the behavior and performance of an application can ease the job of optimization. To aid in this analysis, GemFire provides the ability to register and capture application statistics. An application statistic is simply a number that the application is free to modify and that is monitored by the GemFire's statistics collector. The statistics may be monitored at runtime using the Admin API or GemFire JMX Agent.

Each application statistic is described by a StatisticDescriptor instance. Logical groupings of application statistics are described by a StatisticsType instance that contains the name and description of each statistic. Each instance of an type is represented by an instance of Statistics. The descriptors, types, and instances are created using an instance of the StatisticsFactory interface. Each statistics instance (there may be multiple instances of a statistics type) can be identified by a text id and/or a numeric id. The name, description, etc. of the statistic and its type are available in the Admin API or GemFire JMX Agent.

An application can get, set, and increment the value of a statistic using methods of the Statistics interface. If statistics sampling has been enabled a thread in the application VM periodically reads the values of application statistics allowing them to be viewed by the Admin API and GemFire JMX Agent. Statistics may also be archived to a file, the name and location of which may be configured when creating a DistributedSystem.

In addition to application statistics, GemFire maintains statistics about the distributed system, the distributed cache, and the physical machine on which it runs. These statistics can be monitored, viewed, and archived just like application statistics.

GemFire 8.2.6

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