org.springframework.aop.target.dynamic

类 AbstractRefreshableTargetSource

java.lang.Object

org.springframework.aop.target.dynamic.AbstractRefreshableTargetSource

所有已实现的接口:

Refreshable, TargetClassAware, TargetSource

直接已知子类:

BeanFactoryRefreshableTargetSource

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.

从以下版本开始:

2.0

作者:

Rod Johnson, Rob Harrop, Juergen Hoeller

另请参阅:

requiresRefresh(), freshTarget()

字段概要

字段

限定符和类型	字段和说明
protected Log	logger Logger available to subclasses
protected Object	targetObject

构造器概要

构造器

构造器和说明
AbstractRefreshableTargetSource()

方法概要

限定符和类型	方法和说明
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.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

logger

protected final Log logger

Logger available to subclasses

targetObject

@Nullable
protected Object targetObject

构造器详细资料

AbstractRefreshableTargetSource

public AbstractRefreshableTargetSource()

方法详细资料

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.

getTargetClass

public Class<?> getTargetClass()

从接口复制的说明: 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.

指定者:

getTargetClass 在接口中 TargetClassAware

指定者:

getTargetClass 在接口中 TargetSource

返回:

the type of targets returned by this TargetSource

isStatic

public boolean isStatic()

Not static.

指定者:

isStatic 在接口中 TargetSource

返回:

true if the target is immutable

另请参阅:

TargetSource.getTarget()

getTarget

@Nullable
public final Object getTarget()

从接口复制的说明: TargetSource

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

指定者:

getTarget 在接口中 TargetSource

返回:

the target object which contains the joinpoint, or null if there is no actual target instance

releaseTarget

public void releaseTarget(Object object)

No need to release target.

指定者:

releaseTarget 在接口中 TargetSource

参数:

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

refresh

public final void refresh()

从接口复制的说明: Refreshable

Refresh the underlying target object.

指定者:

refresh 在接口中 Refreshable

getRefreshCount

public long getRefreshCount()

从接口复制的说明: Refreshable

Return the number of actual refreshes since startup.

指定者:

getRefreshCount 在接口中 Refreshable

getLastRefreshTime

public long getLastRefreshTime()

从接口复制的说明: Refreshable

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

指定者:

getLastRefreshTime 在接口中 Refreshable

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.

返回:

whether a refresh is required

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).

返回:

the fresh target object