1*cc02d7e2SAndroid Build Coastguard Worker# gRPC C++ Interceptors Example 2*cc02d7e2SAndroid Build Coastguard Worker 3*cc02d7e2SAndroid Build Coastguard WorkerThe C++ Interceptors example shows how interceptors might be used with a simple key-value store. Note that the C++ Interception API is still experimental and subject to change. 4*cc02d7e2SAndroid Build Coastguard Worker 5*cc02d7e2SAndroid Build Coastguard Worker## Key Value Store 6*cc02d7e2SAndroid Build Coastguard Worker 7*cc02d7e2SAndroid Build Coastguard WorkerThe key-value store service is defined in [keyvaluestore.proto](https://github.com/grpc/grpc/blob/master/examples/protos/keyvaluestore.proto).It has a simple bidi streaming RPC where the request messages contain a key and the response messages contain a value. 8*cc02d7e2SAndroid Build Coastguard Worker 9*cc02d7e2SAndroid Build Coastguard WorkerThe example shows a very naive CachingInterceptor added on the client channel that caches the key-value pairs that it sees. If the client looks up a key present in the cache, the interceptor responds with its saved value and the server doesn't see the request for that key. 10*cc02d7e2SAndroid Build Coastguard Worker 11*cc02d7e2SAndroid Build Coastguard WorkerOn the server-side, a very simple logging interceptor is added that simply logs to stdout whenever a new RPC is received. 12*cc02d7e2SAndroid Build Coastguard Worker 13*cc02d7e2SAndroid Build Coastguard Worker## Running the example 14*cc02d7e2SAndroid Build Coastguard Worker 15*cc02d7e2SAndroid Build Coastguard WorkerTo run the server - 16*cc02d7e2SAndroid Build Coastguard Worker 17*cc02d7e2SAndroid Build Coastguard Worker``` 18*cc02d7e2SAndroid Build Coastguard Worker$ tools/bazel run examples/cpp/interceptors:server 19*cc02d7e2SAndroid Build Coastguard Worker``` 20*cc02d7e2SAndroid Build Coastguard Worker 21*cc02d7e2SAndroid Build Coastguard WorkerTo run the client (on a different terminal) - 22*cc02d7e2SAndroid Build Coastguard Worker 23*cc02d7e2SAndroid Build Coastguard Worker``` 24*cc02d7e2SAndroid Build Coastguard Worker$ tools/bazel run examples/cpp/interceptors:client 25*cc02d7e2SAndroid Build Coastguard Worker``` 26