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

# CommandCompletionServiceGrpc.CommandCompletionServiceImplBase

> Base class for the server implementation of the service CommandCompletionService. 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.CommandCompletionServiceImplBase

Upstream docs: [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.6/com/daml/ledger/api/v2/CommandCompletionServiceGrpc.CommandCompletionServiceImplBase.html)

**Signature**

```text theme={"theme":{"light":"github-light","dark":"github-dark"}}
public abstract static class CommandCompletionServiceGrpc.CommandCompletionServiceImplBase extends Object implements io.grpc.BindableService, CommandCompletionServiceGrpc.AsyncService
```

**Members**

| Docs                                                                                                                                                                    | Member                               | Introduced | Deprecated | Removed |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------ | ---------- | ---------- | ------- |
| [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.6/com/daml/ledger/api/v2/CommandCompletionServiceGrpc.CommandCompletionServiceImplBase.html#%3Cinit%3E%28%29)  | `CommandCompletionServiceImplBase()` | `3.5.6`    | -          | -       |
| [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.6/com/daml/ledger/api/v2/CommandCompletionServiceGrpc.CommandCompletionServiceImplBase.html#bindService%28%29) | `bindService()`                      | `3.5.6`    | -          | -       |