Interface A2AStreamingClientListener<E>

Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface public interface A2AStreamingClientListener<E>
A listener invoked when an update event is received from an A2A streaming client.

The listener can inspect each event and return an A2AStreamingClientListenerResult to control whether the client should continue consuming the streaming response or stop consuming it and return a response to the caller.

This is useful for scenarios where the caller does not need to observe the entire execution of a remote A2A task. For example, the listener can stop consuming the stream after receiving a specific event, allowing the client invocation to return immediately while the server-side task may continue executing asynchronously.