TargetSource (Spring Framework 5.2.12.RELEASE API)

All Superinterfaces:
TargetClassAware
All Known Implementing Classes:
AbstractBeanFactoryBasedTargetSource, AbstractLazyCreationTargetSource, AbstractPoolingTargetSource, AbstractPrototypeBasedTargetSource, AbstractRefreshableTargetSource, BeanFactoryRefreshableTargetSource, CommonsPool2TargetSource, EmptyTargetSource, HotSwappableTargetSource, JndiObjectTargetSource, LazyInitTargetSource, PrototypeTargetSource, RefreshableScriptTargetSource, SimpleBeanTargetSource, SingletonTargetSource, ThreadLocalTargetSource
```
public interface TargetSource
extends TargetClassAware
```
A TargetSource is used to obtain the current "target" of an AOP invocation, which will be invoked via reflection if no around advice chooses to end the interceptor chain itself.
If a TargetSource is "static", it will always return the same target, allowing optimizations in the AOP framework. Dynamic target sources can support pooling, hot swapping, etc.
Application developers don't usually need to work with TargetSources directly: this is an AOP framework interface.
Author:
Rod Johnson, Juergen Hoeller

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Object`	`getTarget()`	Return a target instance.
`Class<?>`	`getTargetClass()`	Return the type of targets returned by this `TargetSource`.
`boolean`	`isStatic()`	Will all calls to `getTarget()` return the same object?
`void`	`releaseTarget(Object target)`	Release the given target object obtained from the `getTarget()` method, if any.

- Method Detail
  - getTargetClass
```
@Nullable
Class<?> getTargetClass()
```
    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
    Returns:
    the type of targets returned by this TargetSource
  - isStatic
```
boolean isStatic()
```
    Will all calls to getTarget() return the same object?
    In that case, there will be no need to invoke releaseTarget(Object), and the AOP framework can cache the return value of getTarget().
    Returns:
    true if the target is immutable
    See Also:
    getTarget()
  - getTarget
```
@Nullable
Object getTarget()
          throws Exception
```
    Return a target instance. Invoked immediately before the AOP framework calls the "target" of an AOP method invocation.
    Returns:
    the target object which contains the joinpoint, or null if there is no actual target instance
    Throws:
    Exception - if the target object can't be resolved
  - releaseTarget
```
void releaseTarget(Object target)
            throws Exception
```
    Release the given target object obtained from the getTarget() method, if any.
    Parameters:
    target - object obtained from a call to getTarget()
    Throws:
    Exception - if the object can't be released