Package org.eclipse.jetty.server.handler

Class HotSwapHandler

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.HotSwapHandler
All Implemented Interfaces:
Handler, Handler.Container, Handler.Singleton, Request.Handler, Container, Destroyable, Dumpable, Dumpable.DumpableContainer, LifeCycle, Invocable
public class HotSwapHandler extends Handler.AbstractContainer implements Handler.Singleton
A HandlerContainer that allows a hot swap of a wrapped handler.

  • Constructor Details

    • HotSwapHandler

      public HotSwapHandler()

  • Method Details

    • getHandler

      public Handler getHandler()
      Specified by:
      getHandler in interface Handler.Singleton
      Returns:
      Returns the handlers.

    • setHandler

      public void setHandler(Handler handler)
      Specified by:
      setHandler in interface Handler.Singleton
      Parameters:
      handler - Set the Handler which should be wrapped.

    • handle

      public boolean handle(Request request, Response response, 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
      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.

    • getInvocationType

      public Invocable.InvocationType getInvocationType()
      Specified by:
      getInvocationType in interface Invocable
      Specified by:
      getInvocationType in interface Request.Handler
      Overrides:
      getInvocationType in class Handler.AbstractContainer
      Returns:
      The InvocationType of this object

    • destroy

      public void destroy()
      Description copied from class: ContainerLifeCycle
      Destroys the managed Destroyable beans in the reverse order they were added.
      Specified by:
      destroy in interface Destroyable
      Overrides:
      destroy in class Handler.Abstract