Class ScopedHandler

java.lang.Object

org.eclipse.jetty.util.component.AbstractLifeCycle

org.eclipse.jetty.util.component.ContainerLifeCycle

org.eclipse.jetty.ee9.nested.AbstractHandler

org.eclipse.jetty.ee9.nested.AbstractHandlerContainer

org.eclipse.jetty.ee9.nested.HandlerWrapper

org.eclipse.jetty.ee9.nested.ScopedHandler

All Implemented Interfaces:

Handler, HandlerContainer, Container, Destroyable, Dumpable, Dumpable.DumpableContainer, LifeCycle

Direct Known Subclasses:

ContextHandler, ServletHandler, 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 AbstractHandler

AbstractHandler.ErrorDispatchHandler

Nested classes/interfaces inherited from class AbstractLifeCycle

AbstractLifeCycle.AbstractLifeCycleListener, AbstractLifeCycle.StopException

Nested classes/interfaces inherited from interface Container

Container.InheritedListener, Container.Listener

Nested classes/interfaces inherited from interface Dumpable

Dumpable.DumpableContainer

Nested classes/interfaces inherited from interface LifeCycle

LifeCycle.Listener

Field Summary

Fields

Modifier and Type	Field	Description
protected ScopedHandler	_nextScope
protected ScopedHandler	_outerScope

Fields inherited from class HandlerWrapper

_handler

Fields inherited from class AbstractLifeCycle

FAILED, STARTED, STARTING, STOPPED, STOPPING

Fields inherited from interface Dumpable

KEY

Constructor Summary

Constructors

Constructor	Description
ScopedHandler()

Method Summary

Modifier and Type	Method	Description
abstract void	doHandle(String target, Request baseRequest, jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response)	Do the handler work within the scope.
void	doScope(String target, Request baseRequest, jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response)	Scope the handler
protected void	doStart()	Starts the managed lifecycle beans in the order they were added.
final void	handle(String target, Request baseRequest, jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response)	Handle a request.
final void	nextHandle(String target, Request baseRequest, jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response)	Do the handler work within the scope.
final void	nextScope(String target, Request baseRequest, jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response)	Scope the handler

Methods inherited from class HandlerWrapper

destroy, expandChildren, getHandler, getHandlers, getTail, insertHandler, setAsParent, setHandler

Methods inherited from class AbstractHandlerContainer

expandHandler, findContainerOf, getChildHandlerByClass, getChildHandlers, getChildHandlersByClass, setServer

Methods inherited from class AbstractHandler

doError, doStop, getServer

Methods inherited from class ContainerLifeCycle

addBean, addBean, addEventListener, addManaged, contains, dump, dump, dump, dumpObjects, dumpStdErr, getBean, getBeans, getBeans, getContainedBeans, getContainedBeans, installBean, installBean, isAuto, isManaged, isUnmanaged, manage, removeBean, removeBeans, removeEventListener, setBeans, start, stop, unmanage, updateBean, updateBean, updateBeans, updateBeans

Methods inherited from class AbstractLifeCycle

getEventListeners, getState, getState, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, setEventListeners, start, stop, toString

Methods inherited from class Object

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

Methods inherited from interface Container

getCachedBeans, getEventListeners

Methods inherited from interface Dumpable

dumpSelf

Methods inherited from interface Dumpable.DumpableContainer

isDumpable

Methods inherited from interface LifeCycle

addEventListener, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeEventListener, start, stop

Field Details

_outerScope

protected ScopedHandler _outerScope

_nextScope

protected ScopedHandler _nextScope

Constructor Details

ScopedHandler

public ScopedHandler()

Method Details

doStart

protected void doStart()
                throws Exception

Description copied from class: ContainerLifeCycle

Starts the managed lifecycle beans in the order they were added.

Overrides:

doStart in class AbstractHandler

Throws:

Exception - If there was a problem starting. Will cause a transition to FAILED state

handle

public final void handle(String target,
 Request baseRequest,
 jakarta.servlet.http.HttpServletRequest request,
 jakarta.servlet.http.HttpServletResponse response)
                  throws IOException,
jakarta.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.

response - The response as the Response object or a wrapper of that request.

Throws:

IOException - if unable to handle the request or response processing

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

doScope

public void doScope(String target,
 Request baseRequest,
 jakarta.servlet.http.HttpServletRequest request,
 jakarta.servlet.http.HttpServletResponse response)
             throws IOException,
jakarta.servlet.ServletException

Scope the handler

Derived implementations should call nextScope(String, Request, HttpServletRequest, HttpServletResponse)

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.

response - The response as the Response object or a wrapper of that request.

Throws:

IOException - if unable to handle the request or response processing

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

nextScope

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

Scope the handler

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.

response - The response as the Response object or a wrapper of that request.

Throws:

IOException - if unable to handle the request or response processing

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

doHandle

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

Do the handler work within the scope.

Derived implementations should call nextHandle(String, Request, HttpServletRequest, HttpServletResponse)

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.

response - The response as the Response object or a wrapper of that request.

Throws:

IOException - if unable to handle the request or response processing

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

nextHandle

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

Do the handler work within the scope.

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.

response - The response as the Response object or a wrapper of that request.

Throws:

IOException - if unable to handle the request or response processing

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