AbstractPool (GlassFish Core EJB container implementation 5.1.0-RC1 API)

java.lang.Object
- com.sun.ejb.containers.util.pool.AbstractPool

All Implemented Interfaces:

Pool

Direct Known Subclasses:

NonBlockingPool
```
public abstract class AbstractPool
extends Object
implements Pool
```
Abstract pool provides the basic implementation of an object pool. The implementation uses a linked list to maintain a list of (available) objects. If the pool is empty it simply creates one using the ObjectFactory instance. Subclasses can change this behaviour by overriding getObject(...) and returnObject(....) methods. This class provides basic support for synchronization, event notification, pool shutdown and pool object recycling. It also does some very basic bookkeeping like the number of objects created, number of threads waiting for object.
Subclasses can make use of these book-keeping data to provide complex pooling mechanism like LRU / MRU / Random. Also, note that AbstractPool does not have a notion of pool limit. It is upto to the derived classes to implement these features.

Field Summary

Fields
Modifier and Type	Field and Description
`protected static Logger`	`_logger`
`protected String`	`appName`
`protected long`	`beanId`
`protected String`	`configData`
`protected ClassLoader`	`containerClassLoader`
`protected int`	`createdCount`
`protected int`	`destroyedCount`
`protected String`	`ejbName`
`protected ObjectFactory`	`factory`
`protected int`	`idleTimeoutInSeconds`
`protected ArrayList`	`list`
`protected int`	`maxPoolSize`
`protected long`	`maxWaitTimeInMillis`
`protected String`	`modName`
`protected String`	`poolName`
`protected EjbPoolProbeProvider`	`poolProbeNotifier`
`protected int`	`poolReturned`
`protected int`	`poolSuccess`
`protected int`	`resizeQuantity`
`protected int`	`steadyPoolSize`
`protected int`	`waitCount`

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`AbstractPool()`
`protected`	`AbstractPool(ObjectFactory factory, long beanId, int steadyPoolSize, int resizeQuantity, int maxPoolsize, long maxWaitTimeInMillis, int idleTimeoutInSeconds, ClassLoader loader)`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`appendStats(StringBuffer sbuf)`
`void`	`close()` Close the pool
`void`	`destroyObject(Object object)` Destroys an Object.
`String`	`getAllAttrValues()`
`String`	`getAllMonitoredAttrbuteValues()`
`int`	`getCreatedCount()`
`int`	`getDestroyedCount()`
`int`	`getIdleTimeoutInSeconds()`
`int`	`getJmsMaxMessagesLoad()`
`int`	`getMaxPoolSize()`
`long`	`getMaxWaitTimeInMillis()`
`int`	`getNumBeansInPool()`
`int`	`getNumThreadsWaiting()`
`Object`	`getObject(boolean canWait, Object param)` Get an object.
`Object`	`getObject(long maxWaitTime, Object param)`
`Object`	`getObject(Object param)` Get an object from the pool within the specified time.
`int`	`getPoolSuccess()`
`int`	`getResizeQuantity()`
`int`	`getSize()`
`int`	`getSteadyPoolSize()`
`int`	`getTotalBeansCreated()`
`int`	`getTotalBeansDestroyed()`
`int`	`getWaitCount()`
`protected void`	`initializePool(ObjectFactory factory, long beanId, int steadyPoolSize, int resizeQuantity, int maxPoolsize, long maxWaitTimeInMillis, int idleTimeoutInSeconds, ClassLoader loader)`
`protected void`	`preload(int count)` Preload the pool with objects.
`protected void`	`remove(int count)`
`protected abstract void`	`removeIdleObjects()`
`void`	`returnObject(Object object)` Return an object back to the pool.
`void`	`setConfigData(String configData)`
`void`	`setContainerClassLoader(ClassLoader loader)`
`void`	`setInfo(String appName, String modName, String ejbName)`
`protected void`	`unregisterProbeProvider()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

_logger
```
protected static final Logger _logger
```

list
```
protected ArrayList list
```

factory
```
protected ObjectFactory factory
```

waitCount
```
protected int waitCount
```

createdCount
```
protected int createdCount
```

steadyPoolSize
```
protected int steadyPoolSize
```

resizeQuantity
```
protected int resizeQuantity
```

maxPoolSize
```
protected int maxPoolSize
```

maxWaitTimeInMillis
```
protected long maxWaitTimeInMillis
```

idleTimeoutInSeconds
```
protected int idleTimeoutInSeconds
```

containerClassLoader

protected ClassLoader containerClassLoader

destroyedCount
```
protected int destroyedCount
```

poolSuccess
```
protected int poolSuccess
```

poolName
```
protected String poolName
```

poolReturned
```
protected int poolReturned
```

configData
```
protected String configData
```

poolProbeNotifier

protected EjbPoolProbeProvider poolProbeNotifier

appName
```
protected String appName
```

modName
```
protected String modName
```

ejbName
```
protected String ejbName
```

beanId
```
protected long beanId
```

Constructor Detail

AbstractPool
```
protected AbstractPool()
```

AbstractPool

protected AbstractPool(ObjectFactory factory,
                       long beanId,
                       int steadyPoolSize,
                       int resizeQuantity,
                       int maxPoolsize,
                       long maxWaitTimeInMillis,
                       int idleTimeoutInSeconds,
                       ClassLoader loader)

Method Detail

initializePool

protected void initializePool(ObjectFactory factory,
                              long beanId,
                              int steadyPoolSize,
                              int resizeQuantity,
                              int maxPoolsize,
                              long maxWaitTimeInMillis,
                              int idleTimeoutInSeconds,
                              ClassLoader loader)

setContainerClassLoader

public void setContainerClassLoader(ClassLoader loader)

setInfo

public void setInfo(String appName,
                    String modName,
                    String ejbName)

getObject
```
public Object getObject(boolean canWait,
                        Object param)
                 throws PoolException
```
Get an object. Application can use pool.getObject() to get an object instead of using new XXX().

Specified by:

getObject in interface Pool

Parameters:

canWait - Must be true if the calling thread is willing to wait for infinite time to get an object, false if the calling thread does not want to wait at all.

Throws:

PoolException

getObject

public Object getObject(long maxWaitTime,
                        Object param)
                 throws PoolException

Specified by:: getObject in interface Pool
Throws:: PoolException

getObject
```
public Object getObject(Object param)
                 throws PoolException
```
Description copied from interface: Pool

Get an object from the pool within the specified time.

Specified by:

getObject in interface Pool

Returns:

an Object or null if an object could not be returned in 'waitForMillis' millisecond.

Throws:

PoolException

returnObject
```
public void returnObject(Object object)
```
Return an object back to the pool. An object that is obtained through getObject() must always be returned back to the pool using either returnObject(obj) or through destroyObject(obj).

Specified by:

returnObject in interface Pool

destroyObject
```
public void destroyObject(Object object)
```
Destroys an Object. Note that applications should not ignore the reference to the object that they got from getObject(). An object that is obtained through getObject() must always be returned back to the pool using either returnObject(obj) or through destroyObject(obj). This method tells that the object should be destroyed and cannot be reused.

Specified by:

destroyObject in interface Pool

preload
```
protected void preload(int count)
```
Preload the pool with objects.

Parameters:

count - the number of objects to be added.

close
```
public void close()
```
Close the pool

remove
```
protected void remove(int count)
```

removeIdleObjects

protected abstract void removeIdleObjects()

getCreatedCount
```
public int getCreatedCount()
```

getDestroyedCount
```
public int getDestroyedCount()
```

getPoolSuccess
```
public int getPoolSuccess()
```

getSize
```
public int getSize()
```

getWaitCount
```
public int getWaitCount()
```

getSteadyPoolSize
```
public int getSteadyPoolSize()
```

getResizeQuantity
```
public int getResizeQuantity()
```

getMaxPoolSize
```
public int getMaxPoolSize()
```

getMaxWaitTimeInMillis
```
public long getMaxWaitTimeInMillis()
```

getIdleTimeoutInSeconds
```
public int getIdleTimeoutInSeconds()
```

setConfigData

public void setConfigData(String configData)

appendStats

public void appendStats(StringBuffer sbuf)

getJmsMaxMessagesLoad
```
public int getJmsMaxMessagesLoad()
```

getNumBeansInPool
```
public int getNumBeansInPool()
```

getNumThreadsWaiting
```
public int getNumThreadsWaiting()
```

getTotalBeansCreated
```
public int getTotalBeansCreated()
```

getTotalBeansDestroyed
```
public int getTotalBeansDestroyed()
```

getAllMonitoredAttrbuteValues

public String getAllMonitoredAttrbuteValues()

getAllAttrValues
```
public String getAllAttrValues()
```

unregisterProbeProvider

protected void unregisterProbeProvider()

Class AbstractPool

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

_logger

list

factory

waitCount

createdCount

steadyPoolSize

resizeQuantity

maxPoolSize

maxWaitTimeInMillis

idleTimeoutInSeconds

containerClassLoader

destroyedCount

poolSuccess

poolName

poolReturned

configData

poolProbeNotifier

appName

modName

ejbName

beanId

Constructor Detail

AbstractPool

AbstractPool

Method Detail

initializePool

setContainerClassLoader

setInfo

getObject

getObject

getObject

returnObject

destroyObject

preload

close

remove

removeIdleObjects

getCreatedCount

getDestroyedCount

getPoolSuccess

getSize

getWaitCount

getSteadyPoolSize

getResizeQuantity

getMaxPoolSize

getMaxWaitTimeInMillis

getIdleTimeoutInSeconds

setConfigData

appendStats

getJmsMaxMessagesLoad

getNumBeansInPool

getNumThreadsWaiting

getTotalBeansCreated

getTotalBeansDestroyed

getAllMonitoredAttrbuteValues

getAllAttrValues

unregisterProbeProvider