Package org.eclipse.jetty.server.handler

Class ScopedHandler

java.lang.Object

org.eclipse.jetty.util.component.AbstractLifeCycle

org.eclipse.jetty.util.component.ContainerLifeCycle

org.eclipse.jetty.server.handler.AbstractHandler

org.eclipse.jetty.server.handler.AbstractHandlerContainer

org.eclipse.jetty.server.handler.HandlerWrapper

org.eclipse.jetty.server.handler.ScopedHandler

All Implemented Interfaces:

Handler, HandlerContainer, org.eclipse.jetty.util.component.Destroyable, org.eclipse.jetty.util.component.LifeCycle

Direct Known Subclasses:

ContextHandler, SessionHandler

public abstract class ScopedHandler
extends HandlerWrapper

ScopedHandler. A ScopedHandler is a HandlerWrapper where the wrapped handlers each define a scope.

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();
             }
         }
     }
 

Nested Class Summary

Nested classes/interfaces inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

org.eclipse.jetty.util.component.AbstractLifeCycle.AbstractLifeCycleListener

Nested classes/interfaces inherited from interface org.eclipse.jetty.util.component.Container

org.eclipse.jetty.util.component.Container.InheritedListener, org.eclipse.jetty.util.component.Container.Listener

Nested classes/interfaces inherited from interface org.eclipse.jetty.util.component.LifeCycle

org.eclipse.jetty.util.component.LifeCycle.Listener

Field Summary

Fields

Modifier and Type	Field	Description
protected ScopedHandler	_nextScope
protected ScopedHandler	_outerScope

Fields inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

FAILED, RUNNING, STARTED, STARTING, STOP_ON_FAILURE, STOPPED, STOPPING

Fields inherited from class org.eclipse.jetty.server.handler.HandlerWrapper

_handler

Constructor Summary

Constructors

Constructor	Description
ScopedHandler()

Method Summary

Modifier and Type	Method	Description
abstract void	doHandle(java.lang.String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
abstract void	doScope(java.lang.String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
protected void	doStart()
void	handle(java.lang.String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)	Handle a request.
protected boolean	never()
void	nextHandle(java.lang.String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
void	nextScope(java.lang.String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)

Methods inherited from class org.eclipse.jetty.server.handler.AbstractHandler

doStop, dumpThis, getServer

Methods inherited from class org.eclipse.jetty.server.handler.AbstractHandlerContainer

expandHandler, findContainerOf, getChildHandlerByClass, getChildHandlers, getChildHandlersByClass, setServer

Methods inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

addLifeCycleListener, getState, getState, getStopTimeout, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stop

Methods inherited from class org.eclipse.jetty.util.component.ContainerLifeCycle

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

Methods inherited from class org.eclipse.jetty.server.handler.HandlerWrapper

destroy, expandChildren, getHandler, getHandlers, insertHandler, setHandler

Methods inherited from interface org.eclipse.jetty.util.component.LifeCycle

addLifeCycleListener, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

_outerScope

protected ScopedHandler _outerScope

_nextScope

protected ScopedHandler _nextScope

Constructor Detail

ScopedHandler

public ScopedHandler()

Method Detail

doStart

protected void doStart()
                throws java.lang.Exception

Overrides:

doStart in class AbstractHandler

Throws:

java.lang.Exception

See Also:

AbstractHandler.doStart()

handle

public final void handle(java.lang.String target,
                         Request baseRequest,
                         javax.servlet.http.HttpServletRequest request,
                         javax.servlet.http.HttpServletResponse response)
                  throws java.io.IOException,
                         javax.servlet.ServletException

Description copied from interface: Handler

Handle a request.

Specified by:

handle in interface Handler

Overrides:

handle in class HandlerWrapper

Parameters:

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.

Throws:

java.io.IOException - if unable to handle the request or response processing

javax.servlet.ServletException - if unable to handle the request or response due to underlying servlet issue

doScope

public abstract void doScope(java.lang.String target,
                             Request baseRequest,
                             javax.servlet.http.HttpServletRequest request,
                             javax.servlet.http.HttpServletResponse response)
                      throws java.io.IOException,
                             javax.servlet.ServletException

Throws:

java.io.IOException

javax.servlet.ServletException

nextScope

public final void nextScope(java.lang.String target,
                            Request baseRequest,
                            javax.servlet.http.HttpServletRequest request,
                            javax.servlet.http.HttpServletResponse response)
                     throws java.io.IOException,
                            javax.servlet.ServletException

Throws:

java.io.IOException

javax.servlet.ServletException

doHandle

public abstract void doHandle(java.lang.String target,
                              Request baseRequest,
                              javax.servlet.http.HttpServletRequest request,
                              javax.servlet.http.HttpServletResponse response)
                       throws java.io.IOException,
                              javax.servlet.ServletException

Throws:

java.io.IOException

javax.servlet.ServletException

nextHandle

public final void nextHandle(java.lang.String target,
                             Request baseRequest,
                             javax.servlet.http.HttpServletRequest request,
                             javax.servlet.http.HttpServletResponse response)
                      throws java.io.IOException,
                             javax.servlet.ServletException

Throws:

java.io.IOException

javax.servlet.ServletException

never

protected boolean never()