| commit | 30b59885b7496b53eb17f64ba1d822c2d9a6c69a | [log] [tgz] |
|---|---|---|
| author | Carl Mastrangelo <[email protected]> | Mon Oct 30 10:30:34 2017 -0700 |
| committer | GitHub <[email protected]> | Mon Oct 30 10:30:34 2017 -0700 |
| tree | eab8390b6f1568020e811be297ee5f85cb5e900e | |
| parent | 53c135a48f979e236678af40aa88909f6564ec97 [diff] |
compiler: add methods for accessing method descriptors * MethodDescriptor is lazy loaded, so protobuf loading only happens on demand. This also means tracing registration happens on demand. * The names of the getters all being with `method`. This makes it harder for autocomplete to pick them up. * A new field is used, which matches the getter name. Rather than make the new-getters reference the old-fields, make the old-fields reference the new getters. This makes removal of the old-fields a simple operation. * The getters may not be inlineable, but thats an easy fix if it ends up being a problem. Not worth premature optimization (but is worth future work). The expected timeline for this is adding this to the 1.8 cut, and deprecating the old-fields. They will be removed in 1.9.
gRPC-Java works with JDK 6. TLS usage typically requires using Java 8, or Play Services Dynamic Security Provider on Android. Please see the Security Readme.
Download the JARs. Or for Maven with non-Android, add to your pom.xml:
<dependency> <groupId>io.grpc</groupId> <artifactId>grpc-netty</artifactId> <version>1.7.0</version> </dependency> <dependency> <groupId>io.grpc</groupId> <artifactId>grpc-protobuf</artifactId> <version>1.7.0</version> </dependency> <dependency> <groupId>io.grpc</groupId> <artifactId>grpc-stub</artifactId> <version>1.7.0</version> </dependency>
Or for Gradle with non-Android, add to your dependencies:
compile 'io.grpc:grpc-netty:1.7.0' compile 'io.grpc:grpc-protobuf:1.7.0' compile 'io.grpc:grpc-stub:1.7.0'
For Android client, use grpc-okhttp instead of grpc-netty and grpc-protobuf-lite or grpc-protobuf-nano instead of grpc-protobuf:
compile 'io.grpc:grpc-okhttp:1.7.0' compile 'io.grpc:grpc-protobuf-lite:1.7.0' compile 'io.grpc:grpc-stub:1.7.0'
Development snapshots are available in Sonatypes's snapshot repository.
For protobuf-based codegen, you can put your proto files in the src/main/proto and src/test/proto directories along with an appropriate plugin.
For protobuf-based codegen integrated with the Maven build system, you can use protobuf-maven-plugin (Eclipse and NetBeans users should also look at os-maven-plugin's IDE documentation):
<build> <extensions> <extension> <groupId>kr.motd.maven</groupId> <artifactId>os-maven-plugin</artifactId> <version>1.5.0.Final</version> </extension> </extensions> <plugins> <plugin> <groupId>org.xolstice.maven.plugins</groupId> <artifactId>protobuf-maven-plugin</artifactId> <version>0.5.0</version> <configuration> <protocArtifact>com.google.protobuf:protoc:3.4.0:exe:${os.detected.classifier}</protocArtifact> <pluginId>grpc-java</pluginId> <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.7.0:exe:${os.detected.classifier}</pluginArtifact> </configuration> <executions> <execution> <goals> <goal>compile</goal> <goal>compile-custom</goal> </goals> </execution> </executions> </plugin> </plugins> </build>
For protobuf-based codegen integrated with the Gradle build system, you can use protobuf-gradle-plugin:
apply plugin: 'java' apply plugin: 'com.google.protobuf' buildscript { repositories { mavenCentral() } dependencies { // ASSUMES GRADLE 2.12 OR HIGHER. Use plugin version 0.7.5 with earlier // gradle versions classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.1' } } protobuf { protoc { artifact = "com.google.protobuf:protoc:3.4.0" } plugins { grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.7.0' } } generateProtoTasks { all()*.plugins { grpc {} } } }
If you are making changes to gRPC-Java, see the compiling instructions.
Here‘s 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.
The Stub layer is what is exposed to most developers and provides type-safe bindings to whatever datamodel/IDL/interface you are adapting. gRPC comes with a plugin to the protocol-buffers compiler that generates Stub interfaces out of .proto files, but bindings to other datamodel/IDL should be trivial to add and are welcome.
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.
The Transport layer does the heavy lifting of putting and 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.
Note the transport layer API is considered internal to gRPC and has weaker API guarantees than the core API under package io.grpc.
gRPC comes with three Transport implementations:
The examples and the Android example are standalone projects that showcase the usage of gRPC.