IronJacamar management
The goal of this page is to describe the management features of the IronJacamar container, the design and key implementation classes.
Requirements
The overall requirements are
- Show the configuration of deployed resource adapters and datasources
- Show statistics for resource adapters and datasources
- Apply changes to the configuration of deployed resource adapters and datasources
- Invoke operations on the deployed resource adapters and datasources
Design
We should a central place where the management view of resource adapters and datasources are registered (ManagementRepository).
This repository provides access to classes (Connector / DataSource) that represent a single deployment of either a resource adapter or a datasource.
Each of these classes are split into a hierarchy where information about the deployment and references to the live objects are maintained. It must be a design goal that the management classes uses methods from the public API of the IronJacamar container.
ManagementRepository
|
|- Connector
| |
| |- Resource Adapter
| |
| |- Connection Factories
| |
| |- Admin Objects
|
|- DataSource
See a description of each class below.
The implementation must be pure POJO, and only depend on the IronJacamar container.
Clients of the management repository contains the management specific technology, such as
- Java Management Extensions (JMX)
- JBoss Application Server 7 domain model
- RHQ
That way we can provide an API that can be used from all client types.
ManagementRepository
Method
| Description |
|---|
| getConnectors() | The active resource adapters |
| getDataSources() | The active datasources |
Connector
Method
| Description |
|---|
| getUniqueId() | The unique identifier for the deployment |
| getResourceAdapter() | The resource adapter |
| getConnectionFactories() | The connection factories |
| getAdminObjects() | The admin objects |
Resource Adapter
Method
| Description
|
|---|
| getResourceAdapter() | A reference to the live object |
| getConfigProperties() | The config-property's for the resource adapter |
| getStatistics() | A reference to the statistics module for the resource adapter |
Connection Factory
Method
| Description
|
|---|
| getJndiName() | The JNDI name of the connection factory |
| getConnectionFactory() | A reference to the connection factory |
| getManagedConnectionFactory() | A reference to the managed connection factory |
| getPool() | A reference to the pool |
| getPoolConfiguration() | A reference to the pool configuration |
ManagedConnectionFactory
Method
| Description |
|---|
| getManagedConnectionFactory() | A reference to the live object |
| getConfigProperties() | The config-property's for the managed connection factory |
| getStatistics() | A reference to the statistics module for the managed connection factory |
AdminObject
Method
| Description
|
|---|
| getJndiName() | The JNDI name for the admin object |
| getAdminObject() | A reference to the live object |
| getConfigProperties() | The config-property's for the admin object |
| getStatistics() | A reference to the statistics module for the admin object |
ConfigProperty
Method
| Description
|
|---|
| getName() | The name of the config-property |
| isDynamic() | Is the config-property dynamic - e.g. supports live updates |
| isConfidential() | Is the config-property confidential |
DataSource
Method
| Description |
|---|
| getJndiName() | The JNDI name of the datasource |
| isXA() | Is the datasource XA capable |
| getPool() | A reference to the pool |
| getPoolConfiguration() | A reference to the pool configuration |
Features
TBD
Operations
Description of the operations that can be invoked are listed below.
- "Per request" -- Once an update has been performed it will be used at the next invocation of a method which uses the property in question
- "Per container" -- Is applied once a container is started/restarted
PoolConfiguration
Property
| Read | Write | Applied |
|---|
| MinSize | Y | Y | Per request |
| MaxSize | Y | Y | Per request |
| BlockingTimeout | Y | Y | Per request |
| IdleTimeout | Y | Y | Per container |
| BackgroundValidation | Y | Y | Per container |
| BackgroundValidationMinutes | Y | Y | Per container |
| Prefill | Y | Y | Per container |
| StrictMin | Y | Y | Per request |
| UseFastFail | Y | Y | Per request |
Statistics
Statistics should be handled through an SPI using the following two interfaces
org.jboss.jca.core.spi.statistics.Statistics
org.jboss.jca.core.spi.statistics.StatisticsPlugin
The "Statistics" interface identifies that the component in question supports statistics. The "StatisticsPlugin" interface defines the contract for the statistics module.
Implementation
The implementation is located in the core module of the IronJacamar repository. The package is
org.jboss.jca.core.api.management
The implementing classes must use java.lang.ref.WeakReference for all live object references, such that won't prevent a garbage collection of the object in question.
Operations
PoolConfiguration
Access can be done directly on the reference.
Statistics
It is possible to enable/disable statistics collection, as well as clear current values.
All statistics are read-only.
PoolStatistics
Property
| Description |
|---|
| ActiveCount | The active count |
| AverageBlockingTime | The average time spent blocking on a connection |
| AverageCreationTime | The average time spent on creating a physical connection |
| CreatedCount | The created count |
| DestroyedCount | The destroyed count |
| MaxCreationTime | The maximum time spent on creating a physical connection |
| MaxUsedCount | The maximum number of connections used |
| MaxWaitTime | The maximum time waiting for a connection |
| TimedOut | The timed out connections |
| TotalBlockingTime | The total time spent blocking for connections |
| TotalCreationTime | The total time spent creating physical connections |
Test suite
The management model is currently tested through the RHQ plugin.
JDBC
The JDBC resource adapter has the following statistics exposed
Statistics
| Description |
|---|
| PreparedStatementCacheAccessCount | The number of times that the statement cache was accessed |
| PreparedStatementCacheAddCount | The number of statements added to the statement cache |
| PreparedStatementCacheCurrentSize | The number of prepared and callable statements currently cached in the statement cache |
| PreparedStatementCacheDeleteCount | The number of statements discarded from the cache |
| PreparedStatementCacheHitCount | The number of times that statements from the cache were used |
| PreparedStatementCacheMissCount | The number of times that a statement request could not be satisfied with a statement from the cache |