public abstract class ScopedHandler extends HandlerWrapper
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.Listener| Modifier and Type | Field and Description |
|---|---|
protected ScopedHandler |
_nextScope |
protected ScopedHandler |
_outerScope |
_handler_listeners, FAILED, RUNNING, STARTED, STARTING, STOPPED, STOPPING| Constructor and Description |
|---|
ScopedHandler() |
| Modifier and Type | Method and Description |
|---|---|
abstract void |
doHandle(String target,
Request baseRequest,
javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response) |
abstract void |
doScope(String target,
Request baseRequest,
javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response) |
protected void |
doStart()
Start the managed lifecycle beans in the order they were added.
|
void |
handle(String target,
Request baseRequest,
javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response)
Handle a request.
|
protected boolean |
never() |
void |
nextHandle(String target,
Request baseRequest,
javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response) |
void |
nextScope(String target,
Request baseRequest,
javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response) |
destroy, doStop, expandChildren, getHandler, getHandlers, getNestedHandlerByClass, setHandler, setServerdump, expandHandler, findContainerOf, getChildHandlerByClass, getChildHandlers, getChildHandlersByClassdumpThis, getServeraddBean, addBean, contains, dump, dump, dump, dump, dumpObject, dumpStdErr, getBean, getBeans, getBeans, isManaged, manage, removeBean, removeBeans, unmanageaddLifeCycleListener, getState, getState, 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
AggregateLifeCycledoStart in class HandlerWrapperExceptionHandlerWrapper.doStart()public final void handle(String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws IOException, javax.servlet.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 AbstractHttpConnection.getCurrentConnection()
method can be used access the Request object if required.response - The response as the Response
object or a wrapper of that request. The AbstractHttpConnection.getCurrentConnection()
method can be used access the Response object if required.IOExceptionjavax.servlet.ServletExceptionpublic abstract void doScope(String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws IOException, javax.servlet.ServletException
IOExceptionjavax.servlet.ServletExceptionpublic final void nextScope(String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws IOException, javax.servlet.ServletException
IOExceptionjavax.servlet.ServletExceptionpublic abstract void doHandle(String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws IOException, javax.servlet.ServletException
IOExceptionjavax.servlet.ServletExceptionpublic final void nextHandle(String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws IOException, javax.servlet.ServletException
IOExceptionjavax.servlet.ServletExceptionprotected boolean never()
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