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

All Implemented Interfaces:
Refreshable, TargetClassAware, TargetSource
Direct Known Subclasses:
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.
Since:
2.0
Author:
Rod Johnson, Rob Harrop, Juergen Hoeller
See Also:
requiresRefresh(), freshTarget()

Field Summary
Fields
Modifier and Type Field Description
protected Log logger
Logger available to subclasses.
protected Object targetObject

Constructor Summary
Constructors
Constructor Description
AbstractRefreshableTargetSource()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`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 final Log logger
```
    Logger available to subclasses.
  - targetObject
```
@Nullable
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.
  - 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
  - isStatic
```
public boolean isStatic()
```
    Not static.
    Specified by:
    isStatic in interface TargetSource
    Returns:
    true if the target is immutable
    See Also:
    TargetSource.getTarget()
  - getTarget
```
@Nullable
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, or null if there is no actual target instance
  - 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()
  - refresh
```
public final void refresh()
```
    Description copied from interface: Refreshable
    Refresh the underlying target object.
    Specified by:
    refresh in interface Refreshable
  - getRefreshCount
```
public long getRefreshCount()
```
    Description copied from interface: Refreshable
    Return the number of actual refreshes since startup.
    Specified by:
    getRefreshCount in interface Refreshable
  - 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
  - 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
  - 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

Modifier and Type	Field	Description
`protected Log`	`logger`	Logger available to subclasses.
`protected Object`	`targetObject`

Class AbstractRefreshableTargetSource

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

logger

targetObject

Constructor Detail

AbstractRefreshableTargetSource

Method Detail

setRefreshCheckDelay

getTargetClass

isStatic

getTarget

releaseTarget

refresh

getRefreshCount

getLastRefreshTime

requiresRefresh

freshTarget