Package org.eclipse.jetty.http3.api

Interface Stream.Server.Listener

Enclosing interface:

Stream.Server

public static interface Stream.Server.Listener

A Stream.Server.Listener is the passive counterpart of a Stream.Server and receives server-side events happening on an HTTP/3 stream.

See Also:

• Stream.Server

Method Summary

Modifier and Type	Method	Description
default void	onDataAvailable(Stream.Server stream)	Callback method invoked if the application has expressed demand for content, and if there may be content available.
default void	onFailure(Stream.Server stream, long error, Throwable failure)	Callback method invoked when a stream failure occurred.
default void	onIdleTimeout(Stream.Server stream, TimeoutException failure, Promise<Boolean> promise)	Callback method invoked when the stream idle timeout elapses.
default void	onTrailer(Stream.Server stream, HeadersFrame frame)	Callback method invoked when a trailer is received.

Method Details

onDataAvailable

default void onDataAvailable(Stream.Server stream)

Callback method invoked if the application has expressed demand for content, and if there may be content available.

A server application that wishes to handle request content should typically call Stream.demand() from Session.Server.Listener.onRequest(Server, HeadersFrame).

A client application that wishes to handle response content should typically call Stream.demand() from Stream.Client.Listener.onResponse(Client, HeadersFrame).

Just prior calling this method, the outstanding demand is cancelled; applications that implement this method should read content calling Stream.readData(), and call Stream.demand() to signal to the implementation to call again this method when there may be more content available.

Only one thread at a time invokes this method, although it may not be the same thread across different invocations.

It is always guaranteed that invoking Stream.demand() from within this method will not cause a StackOverflowError.

Typical usage:

 class MyStreamListener implements Stream.Server.Listener
 {
     @Override
     public void onDataAvailable(Stream.Server stream)
     {
         // Read a chunk of the content.
         Stream.Data data = stream.readData();
         if (data == null)
         {
             // No data available now, demand to be called back.
             stream.demand();
         }
         else
         {
             // Process the content.
             process(data.getByteBuffer());
             // Notify that the content has been consumed.
             data.release();
             if (!data.isLast())
             {
                 // Demand to be called back.
                 stream.demand();
             }
         }
     }
 }
 

Parameters:

stream - the stream

onTrailer

default void onTrailer(Stream.Server stream,
 HeadersFrame frame)

Callback method invoked when a trailer is received.

Parameters:

stream - the stream

frame - the HEADERS frame containing the trailer headers

onIdleTimeout

default void onIdleTimeout(Stream.Server stream,
 TimeoutException failure,
 Promise<Boolean> promise)

Callback method invoked when the stream idle timeout elapses.

Parameters:

stream - the stream

failure - the timeout failure

promise - the promise to complete with true to reset the stream, false to ignore the idle timeout

onFailure

default void onFailure(Stream.Server stream,
 long error,
 Throwable failure)

Callback method invoked when a stream failure occurred.

Typical stream failures, among others, are failures to decode a HEADERS frame, or failures to read bytes because the stream has been reset.

Parameters:

stream - the stream

error - the failure error

failure - the cause of the failure