[java-sdk] Dapr's base Client

[artursouza]

• Define interface for the Dapr's Client - wrapper on top of the auto-generated code.
• Implement Adapter for GRPC.
• Implement Adapter for HTTP.

Detail below:

Interface DaprClient { // customer will use this interface.
// methods defined as part of this work.
// actor APIs re defined here too.
}

Class GrpcDapClient implements DaprClient { // customers don’t talk to this one directly
DaprGrpc grpcClient;
// implements methods from interface
// throws exceptions for all actor APIs since actors are http only for now.
}

Class HttpDaprClient implements DaprClient { // customers don’t talk to this directly.
DaprHttpClient httpClient;
// implements methods from interface
// implements actors APIs as well
}

[artursouza]

We have auto-generated client in Grpc. For HTTP we need to add to the current manually generated HTTP client, so it supports all of Dapr's APIs. This base client can sit on top of those.