ClientServiceHandle

Advanced API handle for invoking Restate services, virtual objects, or workflows from the ingress (outside of a handler). This handle provides advanced invocation capabilities including:

• Async request handling with CompletableFuture
• Invocation options such as idempotency keys
• Fire-and-forget requests via send()
• Access to full Response metadata

Use this handle to perform requests with method references:

Client client = Client.connect("http://localhost:8080");

// 1. Use call() with method reference and wait for the result
Response<GreetingResponse> response = client.serviceHandle(Greeter.class)
  .call(Greeter::greet, new Greeting("Alice"));

// 2. Use send() for one-way invocation without waiting
SendResponse<GreetingResponse> sendResponse = client.serviceHandle(Greeter.class)
  .send(Greeter::greet, new Greeting("Alice"));

Create instances using serviceHandle, virtualObjectHandle, or workflowHandle.

For simple synchronous request-response interactions returning just the output, consider using the simple proxy API instead: service, virtualObject, or workflow.

Parameters