Examples with ThrowingFunction org.apache.beam.fn.harness.fn.ThrowingFunction used on opensource projects

Example 1 with ThrowingFunction

use of org.apache.beam.fn.harness.fn.ThrowingFunction in project beam by apache.

the class FnHarness method main.

public static void main(PipelineOptions options, BeamFnApi.ApiServiceDescriptor loggingApiServiceDescriptor, BeamFnApi.ApiServiceDescriptor controlApiServiceDescriptor) throws Exception {
    ManagedChannelFactory channelFactory = ManagedChannelFactory.from(options);
    StreamObserverFactory streamObserverFactory = StreamObserverFactory.fromOptions(options);
    PrintStream originalErrStream = System.err;
    try (BeamFnLoggingClient logging = new BeamFnLoggingClient(options, loggingApiServiceDescriptor, channelFactory::forDescriptor, streamObserverFactory::from)) {
        LOG.info("Fn Harness started");
        EnumMap<BeamFnApi.InstructionRequest.RequestCase, ThrowingFunction<BeamFnApi.InstructionRequest, BeamFnApi.InstructionResponse.Builder>> handlers = new EnumMap<>(BeamFnApi.InstructionRequest.RequestCase.class);
        RegisterHandler fnApiRegistry = new RegisterHandler();
        BeamFnDataGrpcClient beamFnDataMultiplexer = new BeamFnDataGrpcClient(options, channelFactory::forDescriptor, streamObserverFactory::from);
        ProcessBundleHandler processBundleHandler = new ProcessBundleHandler(options, fnApiRegistry::getById, beamFnDataMultiplexer);
        handlers.put(BeamFnApi.InstructionRequest.RequestCase.REGISTER, fnApiRegistry::register);
        handlers.put(BeamFnApi.InstructionRequest.RequestCase.PROCESS_BUNDLE, processBundleHandler::processBundle);
        BeamFnControlClient control = new BeamFnControlClient(controlApiServiceDescriptor, channelFactory::forDescriptor, streamObserverFactory::from, handlers);
        LOG.info("Entering instruction processing loop");
        control.processInstructionRequests(options.as(GcsOptions.class).getExecutorService());
    } catch (Throwable t) {
        t.printStackTrace(originalErrStream);
    } finally {
        originalErrStream.println("Shutting SDK harness down.");
    }
}