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An interceptor is a stateless class that follows the interceptor pattern, as
found in Filter
and in AOP languages.
ActionInvocation
execution and return a return code
(such as Action.SUCCESS
), or it may choose to do some processing before
and/or after delegating the rest of the procesing using ActionInvocation.invoke()
.
Method Summary | |
void |
destroy()
Called to let an interceptor clean up any resources it has allocated. |
void |
init()
Called after an interceptor is created, but before any requests are processed using intercept , giving
the Interceptor a chance to initialize any needed resources. |
String |
intercept(ActionInvocation invocation)
Allows the Interceptor to do some processing on the request before and/or after the rest of the processing of the request by the ActionInvocation or to short-circuit the processing and just return a String return code. |
Method Detail |
public void destroy()
public void init()
intercept
, giving
the Interceptor a chance to initialize any needed resources.
public String intercept(ActionInvocation invocation) throws Exception
ActionInvocation
or to short-circuit the processing and just return a String return code.
ActionInvocation.invoke()
, or from the interceptor itself.
Exception
- any system-level error, as defined in Action.execute()
.
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