public abstract class ScopedHandler extends HandlerWrapper
When handle(String, Request, HttpServletRequest, HttpServletResponse)
is called on the first ScopedHandler in a chain of HandlerWrappers,
the doScope(String, Request, HttpServletRequest, HttpServletResponse) method is
called on all contained ScopedHandlers, before the
doHandle(String, Request, HttpServletRequest, HttpServletResponse) method
is called on all contained handlers.
For example if Scoped handlers A, B & C were chained together, then the calling order would be:
A.handle(...)
A.doScope(...)
B.doScope(...)
C.doScope(...)
A.doHandle(...)
B.doHandle(...)
C.doHandle(...)
If non scoped handler X was in the chained A, B, X & C, then the calling order would be:
A.handle(...)
A.doScope(...)
B.doScope(...)
C.doScope(...)
A.doHandle(...)
B.doHandle(...)
X.handle(...)
C.handle(...)
C.doHandle(...)
A typical usage pattern is:
private static class MyHandler extends ScopedHandler
{
public void doScope(String target, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
try
{
setUpMyScope();
super.doScope(target,request,response);
}
finally
{
tearDownMyScope();
}
}
public void doHandle(String target, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
try
{
doMyHandling();
super.doHandle(target,request,response);
}
finally
{
cleanupMyHandling();
}
}
}
AbstractLifeCycle.AbstractLifeCycleListenerLifeCycle.ListenerContainer.InheritedListener, Container.Listener| Modifier and Type | Field and Description |
|---|---|
protected ScopedHandler |
_nextScope |
protected ScopedHandler |
_outerScope |
_handlerFAILED, RUNNING, STARTED, STARTING, STOP_ON_FAILURE, STOPPED, STOPPING| Constructor and Description |
|---|
ScopedHandler() |
| Modifier and Type | Method and Description |
|---|---|
abstract void |
doHandle(String target,
Request baseRequest,
HttpServletRequest request,
HttpServletResponse response) |
abstract void |
doScope(String target,
Request baseRequest,
HttpServletRequest request,
HttpServletResponse response) |
protected void |
doStart() |
void |
handle(String target,
Request baseRequest,
HttpServletRequest request,
HttpServletResponse response)
Handle a request.
|
protected boolean |
never() |
void |
nextHandle(String target,
Request baseRequest,
HttpServletRequest request,
HttpServletResponse response) |
void |
nextScope(String target,
Request baseRequest,
HttpServletRequest request,
HttpServletResponse response) |
destroy, expandChildren, getHandler, getHandlers, insertHandler, setHandlerexpandHandler, findContainerOf, getChildHandlerByClass, getChildHandlers, getChildHandlersByClass, setServerdoStop, dumpThis, getServeraddBean, addBean, addBean, addEventListener, addManaged, contains, dump, dump, dump, dump, dump, dumpBeans, dumpObject, dumpStdErr, getBean, getBeans, getBeans, isManaged, manage, removeBean, removeBeans, removeEventListener, setBeans, setStopTimeout, start, stop, unmanage, updateBean, updateBean, updateBeansaddLifeCycleListener, getState, getState, getStopTimeout, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stopclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitaddLifeCycleListener, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stopprotected ScopedHandler _outerScope
protected ScopedHandler _nextScope
protected void doStart()
throws Exception
doStart in class AbstractHandlerExceptionAbstractHandler.doStart()public final void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
Handlerhandle in interface Handlerhandle in class HandlerWrappertarget - The target of the request - either a URI or a name.baseRequest - The original unwrapped request object.request - The request either as the Request object or a wrapper of that request. The
HttpConnection.getCurrentConnection().getHttpChannel().getRequest()response - The response as the Response object or a wrapper of that request. The
HttpConnection.getCurrentConnection().getHttpChannel().getResponse()IOException - if unable to handle the request or response processingServletException - if unable to handle the request or response due to underlying servlet issuepublic abstract void doScope(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
IOExceptionServletExceptionpublic final void nextScope(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
IOExceptionServletExceptionpublic abstract void doHandle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
IOExceptionServletExceptionpublic final void nextHandle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
IOExceptionServletExceptionprotected boolean never()
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