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.AbstractLifeCycleListener
LifeCycle.Listener
Container.InheritedListener, Container.Listener
Modifier and Type | Field and Description |
---|---|
protected ScopedHandler |
_nextScope |
protected ScopedHandler |
_outerScope |
_handler
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()
Starts the managed lifecycle beans in the order they were added.
|
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, setHandler
expandHandler, findContainerOf, getChildHandlerByClass, getChildHandlers, getChildHandlersByClass, setServer
doStop, dumpThis, getServer
addBean, 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, updateBeans
addLifeCycleListener, getState, getState, getStopTimeout, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stop
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
addLifeCycleListener, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stop
protected ScopedHandler _outerScope
protected ScopedHandler _nextScope
protected void doStart() throws Exception
ContainerLifeCycle
doStart
in class AbstractHandler
Exception
AbstractHandler.doStart()
public final void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
Handler
handle
in interface Handler
handle
in class HandlerWrapper
target
- 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()
method can be used access the Request object if required.response
- The response as the Response
object or a wrapper of that request. The
HttpConnection.getCurrentConnection()
.getHttpChannel()
.getResponse()
method can be used access the Response object if required.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
IOException
ServletException
public final void nextScope(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
IOException
ServletException
public abstract void doHandle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
IOException
ServletException
public final void nextHandle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
IOException
ServletException
protected boolean never()
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