public abstract class AbstractRefreshableTargetSource extends java.lang.Object implements TargetSource, Refreshable
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.
requiresRefresh(),
freshTarget()| Modifier and Type | Field and Description |
|---|---|
protected Log |
logger
Logger available to subclasses
|
protected java.lang.Object |
targetObject |
| Constructor and Description |
|---|
AbstractRefreshableTargetSource() |
| Modifier and Type | Method and Description |
|---|---|
protected abstract java.lang.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.
|
java.lang.Object |
getTarget()
Return a target instance.
|
java.lang.Class<?> |
getTargetClass()
Return the type of targets returned by this
TargetSource. |
boolean |
isStatic()
Not static.
|
void |
refresh()
Refresh the underlying target object.
|
void |
releaseTarget(java.lang.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.
|
protected final Log logger
protected java.lang.Object targetObject
public void setRefreshCheckDelay(long refreshCheckDelay)
Note that an actual refresh will only happen when
requiresRefresh() returns true.
public java.lang.Class<?> getTargetClass()
TargetSourceTargetSource.
Can return null, although certain usages of a TargetSource
might just work with a predetermined target class.
getTargetClass in interface TargetClassAwaregetTargetClass in interface TargetSourceTargetSourcepublic boolean isStatic()
isStatic in interface TargetSourcetrue if the target is immutableTargetSource.getTarget()public final java.lang.Object getTarget()
TargetSourcegetTarget in interface TargetSourcenull if there is no actual target instancepublic void releaseTarget(java.lang.Object object)
releaseTarget in interface TargetSourceobject - object obtained from a call to TargetSource.getTarget()public final void refresh()
Refreshablerefresh in interface Refreshablepublic long getRefreshCount()
RefreshablegetRefreshCount in interface Refreshablepublic long getLastRefreshTime()
RefreshablegetLastRefreshTime in interface Refreshableprotected boolean requiresRefresh()
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.
protected abstract java.lang.Object freshTarget()
Only invoked if a refresh check has found that a refresh is required
(that is, requiresRefresh() has returned true).