Module org.eclipse.jetty.server

Package org.eclipse.jetty.server.handler

Class GracefulHandler

java.lang.Object

org.eclipse.jetty.util.component.AbstractLifeCycle

org.eclipse.jetty.util.component.ContainerLifeCycle

org.eclipse.jetty.server.Handler.Abstract

org.eclipse.jetty.server.Handler.AbstractContainer

org.eclipse.jetty.server.Handler.Wrapper

org.eclipse.jetty.server.handler.GracefulHandler

All Implemented Interfaces:

Handler, Handler.Container, Handler.Singleton, Request.Handler, org.eclipse.jetty.util.component.Container, org.eclipse.jetty.util.component.Destroyable, org.eclipse.jetty.util.component.Dumpable, org.eclipse.jetty.util.component.Dumpable.DumpableContainer, org.eclipse.jetty.util.component.Graceful, org.eclipse.jetty.util.component.LifeCycle, org.eclipse.jetty.util.thread.Invocable

public class GracefulHandler
extends Handler.Wrapper
implements org.eclipse.jetty.util.component.Graceful

Handler to track active requests and allow them to gracefully complete.

Nested Class Summary

Nested classes/interfaces inherited from class org.eclipse.jetty.server.Handler.Abstract

Handler.Abstract.NonBlocking

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

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

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.Dumpable

org.eclipse.jetty.util.component.Dumpable.DumpableContainer

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

org.eclipse.jetty.util.component.Graceful.Shutdown, org.eclipse.jetty.util.component.Graceful.ThrowingRunnable

Nested classes/interfaces inherited from interface org.eclipse.jetty.server.Handler

Handler.Abstract, Handler.AbstractContainer, Handler.Collection, Handler.Container, Handler.Sequence, Handler.Singleton, Handler.Wrapper

Nested classes/interfaces inherited from interface org.eclipse.jetty.util.thread.Invocable

org.eclipse.jetty.util.thread.Invocable.Callable, org.eclipse.jetty.util.thread.Invocable.InvocationType, org.eclipse.jetty.util.thread.Invocable.ReadyTask, org.eclipse.jetty.util.thread.Invocable.Task

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

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

Nested classes/interfaces inherited from interface org.eclipse.jetty.server.Request.Handler

Request.Handler.AbortException

Field Summary

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

FAILED, STARTED, STARTING, STOPPED, STOPPING

Fields inherited from interface org.eclipse.jetty.util.component.Dumpable

KEY

Fields inherited from interface org.eclipse.jetty.util.thread.Invocable

__nonBlocking, NOOP

Constructor Summary

Constructors

Constructor	Description
GracefulHandler()
GracefulHandler(Handler handler)

Method Summary

Modifier and Type	Method	Description
long	getCurrentRequestCount()
boolean	handle(Request request, Response response, org.eclipse.jetty.util.Callback callback)	Invoked to handle the passed HTTP request and response.
boolean	isShutdown()	Flag indicating that Graceful shutdown has been initiated.
CompletableFuture<Void>	shutdown()

Methods inherited from class org.eclipse.jetty.server.Handler.Wrapper

getHandler, getInvocationType, setHandler

Methods inherited from class org.eclipse.jetty.server.Handler.AbstractContainer

findContainerOf, getDescendant, getDescendants, isDynamic, setDynamic, setServer

Methods inherited from class org.eclipse.jetty.server.Handler.Abstract

destroy, doStart, doStop, getServer

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

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

Methods inherited from class java.lang.Object

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

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

getCachedBeans, getEventListeners

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

destroy

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

dumpSelf

Methods inherited from interface org.eclipse.jetty.util.component.Dumpable.DumpableContainer

isDumpable

Methods inherited from interface org.eclipse.jetty.server.Handler

getServer, setServer

Methods inherited from interface org.eclipse.jetty.server.Handler.Container

getContainer, getDescendant, getDescendants, getDescendants

Methods inherited from interface org.eclipse.jetty.server.Handler.Singleton

getHandlers, getTail, insertHandler, setHandler

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

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

Constructor Details

GracefulHandler

public GracefulHandler()

GracefulHandler

public GracefulHandler(Handler handler)

Method Details

getCurrentRequestCount

@ManagedAttribute("number of requests being currently handled")
public long getCurrentRequestCount()

isShutdown

public boolean isShutdown()

Flag indicating that Graceful shutdown has been initiated.

Specified by:

isShutdown in interface org.eclipse.jetty.util.component.Graceful

Returns:

whether the graceful shutdown has been initiated

See Also:

• Graceful

handle

public boolean handle(Request request,
 Response response,
 org.eclipse.jetty.util.Callback callback)
               throws Exception

Description copied from interface: Request.Handler

Invoked to handle the passed HTTP request and response.

The request is accepted by returning true, then handling must be concluded by completing the passed callback. The handling may be asynchronous, i.e. this method may return true and complete the given callback later, possibly from a different thread. If this method returns false, then the callback must not be invoked and any mutation on the response reversed.

Exceptions thrown by this method may be subsequently handled by an error Request.Handler, if present, otherwise a default HTTP 500 error is generated and the callback completed while writing the error response.

The simplest implementation is:

 public boolean handle(Request request, Response response, Callback callback)
 {
     callback.succeeded();
     return true;
 }
 

A HelloWorld implementation is:

 public boolean handle(Request request, Response response, Callback callback)
 {
     response.write(true, ByteBuffer.wrap("Hello World\n".getBytes(StandardCharsets.UTF_8)), callback);
     return true;
 }
 

Specified by:

handle in interface Request.Handler

Overrides:

handle in class Handler.Wrapper

Parameters:

request - the HTTP request to handle

response - the HTTP response to handle

callback - the callback to complete when the handling is complete

Returns:

True if and only if the request will be handled, a response generated and the callback eventually called. This may occur within the scope of the call to this method, or asynchronously some time later. If false is returned, then this method must not generate a response, nor complete the callback.

Throws:

Exception - if there is a failure during the handling. Catchers cannot assume that the callback will be called and thus should attempt to complete the request as if a false had been returned.

See Also:

• Request.Handler.AbortException

shutdown

public CompletableFuture<Void> shutdown()

Specified by:

shutdown in interface org.eclipse.jetty.util.component.Graceful