> ## Documentation Index
> Fetch the complete documentation index at: https://cantonfoundation-generated-references-ledger-bindings-update.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# CommandCompletionServiceGrpc.AsyncService

> Allows clients to observe the status of their submissions. Commands may be submitted via the Command Submission Service. The on-ledger effects of their submissions are disclosed by the Update Service. Commands may fail in 2 distinct manners: 1. Failure communicated synchronously in the gRPC error of the submission. 2. Failure communicated asynchronously in a Completion, see ``completion.proto``. Note that not only successfully submitted commands MAY produce a completion event. For example, the participant MAY choose to produce a completion event for a rejection of a duplicate command. Clients that do not receive a successful completion about their submission MUST NOT assume that it was successful. Clients SHOULD subscribe to the CompletionStream before starting to submit commands to prevent race conditions.

## CommandCompletionServiceGrpc.AsyncService

Upstream docs: [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.7/com/daml/ledger/api/v2/CommandCompletionServiceGrpc.AsyncService.html)

**Signature**

```text theme={"theme":{"light":"github-light","dark":"github-dark"}}
public static interface CommandCompletionServiceGrpc.AsyncService
```

**Members**

| Docs                                                                                                                                                                                                                                                                  | Member                                                                                                                                                      | Introduced | Deprecated | Removed |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------- | ---------- | ------- |
| [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.7/com/daml/ledger/api/v2/CommandCompletionServiceGrpc.AsyncService.html#completionStream%28com.daml.ledger.api.v2.CommandCompletionServiceOuterClass.CompletionStreamRequest,io.grpc.stub.StreamObserver%29) | `completionStream(CommandCompletionServiceOuterClass.CompletionStreamRequest, StreamObserver<CommandCompletionServiceOuterClass.CompletionStreamResponse>)` | `3.5.7`    | -          | -       |
| [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.7/com/daml/ledger/api/v2/CommandCompletionServiceGrpc.AsyncService.html#getCompletions%28com.daml.ledger.api.v2.CommandCompletionServiceOuterClass.GetCompletionsRequest,io.grpc.stub.StreamObserver%29)     | `getCompletions(CommandCompletionServiceOuterClass.GetCompletionsRequest, StreamObserver<CommandCompletionServiceOuterClass.CompletionStreamResponse>)`     | `3.5.7`    | -          | -       |