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AbstractRefreshableTargetSource (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.aop.target.dynamic
Class AbstractRefreshableTargetSource

java.lang.Object
  org.springframework.aop.target.dynamic.AbstractRefreshableTargetSource

All Implemented Interfaces:

Refreshable, TargetClassAware, TargetSource

Direct Known Subclasses:

BeanFactoryRefreshableTargetSource

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public abstract class AbstractRefreshableTargetSource
extends Object
implements TargetSource, Refreshable

Abstract TargetSource implementation that wraps a refreshable target object. Subclasses can determine whether a refresh is required, and need to provide fresh target objects.

Implements the Refreshable interface in order to allow for explicit control over the refresh status.

Since:

2.0

Author:

Rod Johnson, Rob Harrop, Juergen Hoeller

See Also:

requiresRefresh(), freshTarget()

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Field Summary
protected  Log	logger           Logger available to subclasses
protected  Object	targetObject

 

Constructor Summary
AbstractRefreshableTargetSource()

 

Method Summary
protected abstract  Object	freshTarget()           Obtain a fresh target object.
long	getLastRefreshTime()           Return the last time an actual refresh happened (as timestamp).
long	getRefreshCount()           Return the number of actual refreshes since startup.
Object	getTarget()           Return a target instance.
Class	getTargetClass()           Return the type of targets returned by this TargetSource.
boolean	isStatic()           Not static.
void	refresh()           Refresh the underlying target object.
void	releaseTarget(Object object)           No need to release target.
protected  boolean	requiresRefresh()           Determine whether a refresh is required.
void	setRefreshCheckDelay(long refreshCheckDelay)           Set the delay between refresh checks, in milliseconds.

 

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

 

Field Detail

logger

protected Log logger

Logger available to subclasses

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targetObject

protected Object targetObject

Constructor Detail

AbstractRefreshableTargetSource

public AbstractRefreshableTargetSource()

Method Detail

setRefreshCheckDelay

public void setRefreshCheckDelay(long refreshCheckDelay)

Set the delay between refresh checks, in milliseconds. Default is -1, indicating no refresh checks at all.

Note that an actual refresh will only happen when requiresRefresh() returns true.

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getTargetClass

public Class getTargetClass()

Description copied from interface: TargetSource

Return the type of targets returned by this TargetSource.

Can return null, although certain usages of a TargetSource might just work with a predetermined target class.

Specified by:

getTargetClass in interface TargetClassAware

Specified by:

getTargetClass in interface TargetSource

Returns:

the type of targets returned by this TargetSource

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isStatic

public boolean isStatic()

Not static.

Specified by:

isStatic in interface TargetSource

Returns:

true if the target is immutable

See Also:

TargetSource.getTarget()

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getTarget

public final Object getTarget()

Description copied from interface: TargetSource

Return a target instance. Invoked immediately before the AOP framework calls the "target" of an AOP method invocation.

Specified by:

getTarget in interface TargetSource

Returns:

the target object, which contains the joinpoint

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releaseTarget

public void releaseTarget(Object object)

No need to release target.

Specified by:

releaseTarget in interface TargetSource

Parameters:

object - object obtained from a call to TargetSource.getTarget()

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refresh

public final void refresh()

Description copied from interface: Refreshable

Refresh the underlying target object.

Specified by:

refresh in interface Refreshable

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getRefreshCount

public long getRefreshCount()

Description copied from interface: Refreshable

Return the number of actual refreshes since startup.

Specified by:

getRefreshCount in interface Refreshable

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getLastRefreshTime

public long getLastRefreshTime()

Description copied from interface: Refreshable

Return the last time an actual refresh happened (as timestamp).

Specified by:

getLastRefreshTime in interface Refreshable

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requiresRefresh

protected boolean requiresRefresh()

Determine whether a refresh is required. Invoked for each refresh check, after the refresh check delay has elapsed.

The default implementation always returns true, triggering a refresh every time the delay has elapsed. To be overridden by subclasses with an appropriate check of the underlying target resource.

Returns:

whether a refresh is required

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freshTarget

protected abstract Object freshTarget()

Obtain a fresh target object.

Only invoked if a refresh check has found that a refresh is required (that is, requiresRefresh() has returned true).

Returns:

the fresh target object

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