Decouples grpc-core with census, while still preserve the default integration of census in grpc-core. Users wishing to enable census needs to add grpc-census to their runtime classpath.
- Created a grpc-census module:
- Moved CensusStatsModule.java and CensusTracingModule.java into grpc-census from grpc-core. CensusModuleTests.java is also moved. They now belong to io.grpc.census package.
Moved DeprecatedCensusConstants.java into io.grpc.census.internal (is this necessary?) in grpc-census.
- Created CensusStatsAccessor.java and CensusTracingAccessor.java, which are used to create census ClientInterceptor and ServerStreamTracer.Factory.
- Everything in grpc-census are package private, except the accessor classes. They only publicly expose ClientInterceptor and ServerStreamTracer.Factory, no Census specific types are exposed.
- Use runtime reflection to load and apply census stats/tracing to channel/server builders, if grpc-census is found in runtime classpath.
- Removed special APIs on AbstractManagedChannelImplBuilder and AbstractServerImplBuilder for overriding census module. They are only used for testing. Now we changed tests to apply Census ClientInterceptor and ServerStreamTracer.Factory just as normal interceptor/stream tracer factory. Test writer is responsible for taking care of the ordering concerns of interceptors and stream tracer factories.
This PR adds an automatic gradle format checker and reformats all the *.gradle files. After this, new changes to *.gradle files will fail to build if not in good format, just like checkStyle failure.
This will ease a lot of test scenarios that we want to automatically shut down servers and channels, with much more flexibility than `GrpcServerRule`. Resolves#3624
**ManagedChannel/Server cleanup details:**
- If the test has already failed, call `shutdownNow()` for each of the resources registered. Throw (an exception including) the original failure. End.
- If the test is successful, call `shutdown()` for each of the resources registered.
- Call `awaitTermination()` with `timeout = deadline - current time` and assert termination for each resource. If any error occurs, break immediately and call `shutdownNow()` for the current resource and all the rest resources.
- Throw the first exception encountered if any.
GrpcServerRule configures an in-process server and channel. It is
useful for asserting requests being made to a service. A consumer can
create a mock implementation of their service that records each
request, then make assertions on those records in their test.
This is lower-level than the existing AbstractTransportTest. It should
be used by all transports, but InProcessTransport is the only one as
part of this commit.
Chengyuan Zhang