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The Java gRPC implementation. HTTP/2 based RPC
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README.md

grpc-java

Heres a quick readers guide to the code to help folks get started. At a high level there are three distinct layers to the library: stub, channel & transport.

Stub

The 'stub' layer is what is exposed to most developers and provides type-safe bindings to whatever datamodel/IDL/interface you are adapting. An example is provided of a binding to code generated by the protocol-buffers compiler but others should be trivial to add and are welcome.

Key Interfaces

Stream Observer

Channel

The 'channel' layer is an abstraction over transport handling that is suitable for interception/decoration and exposes more behavior to the application than the stub layer. It is intended to be easy for application frameworks to use this layer to address cross-cutting concerns such as logging, monitoring, auth etc. Flow-control is also exposed at this layer to allow more sophisticated applications to interact with it directly.

Common

Client

Server

Transport

The 'transport' layer does the heavy lifting of putting & taking bytes off the wire. The interfaces to it are abstract just enough to allow plugging in of different implementations. Transports are modeled as 'Stream' factories. The variation in interface between a server stream and a client stream exists to codify their differing semantics for cancellation and error reporting.

Common

Client

Server

Examples

Tests showing how these layers are composed to execute calls using protobuf messages can be found here https://github.com/google/grpc-java/tree/master/integration-testing/src/main/java/com/google/net/stubby/testing/integration