Distributed Systems - Lab 4 (Middleware)

[Java / Python | gRPC] University project

How to build the project:

For Java:

1. Download core from here.

2. Put project files into extracted grpc-java-*/examples/src/main:

   • in /proto paste Hospital.proto file,
   • in /java/someJavaPackage paste Java files.

3. cd ../../.. - go upper to examples directory.

4. Add dependencies to build.gradle (in grpc-java-*/examples):

   ...
   task mainServer(type: CreateStartScripts) {
       mainClassName = 'someJavaPackage.MainServer'
       applicationName = 'main-server'
       outputDir = new File(project.buildDir, 'tmp')
       classpath = jar.outputs.files + project.configurations.runtime
   }
   applicationDistribution.into('bin') {
     ...
     from(mainServer)
   }
   

5. Generate grpc classes from Hospital.proto:

   ./gradlew installDist and ./gradlew dependencies (still in grpc-java-*/examples).

6. Run our app via bash (in grpc-java-*/examples.):

   ./build/install/examples/bin/main-server.

7. Upper commands can be further re-run via gen_java.sh.

For Python:

1. Ensure Hospital.proto is located in home project directory (or uncomment lines in gen_python.sh if Hospital.proto is moved to grpc-java-*/examples/src/main/proto).

2. Run ./gen_python.sh.

3. Ensure generated grpc python files (Hospital_pb2.py and Hospital_pb2_grpc.py) are located in /python directory.

Extras

Directories: /gen, /java and /python should be marked as a source directories.