Function main

example/backup_request_c++/client.cpp:36–87

DEFINE_int32(backup_request_ms, 2, "Timeout for sending backup request");

int main(int argc, char* argv[]) {
    // Parse gflags. We recommend you to use gflags as well.
    GFLAGS_NAMESPACE::ParseCommandLineFlags(&argc, &argv, true);
    
    // A Channel represents a communication line to a Server. Notice that 
    // Channel is thread-safe and can be shared by all threads in your program.
    brpc::Channel channel;

    // Initialize the channel, NULL means using default options.
    brpc::ChannelOptions options;
    options.protocol = FLAGS_protocol;
    options.connection_type = FLAGS_connection_type;
    options.timeout_ms = FLAGS_timeout_ms/*milliseconds*/;
    options.max_retry = FLAGS_max_retry;
    options.backup_request_ms = FLAGS_backup_request_ms;
    if (channel.Init(FLAGS_server.c_str(), FLAGS_load_balancer.c_str(), &options) != 0) {
        LOG(ERROR) << "Fail to initialize channel";
        return -1;
    }

    // Normally, you should not call a Channel directly, but instead construct
    // a stub Service wrapping it. stub can be shared by all threads as well.
    example::EchoService_Stub stub(&channel);

    // Send a request and wait for the response every 1 second.
    int counter = 0;
    while (!brpc::IsAskedToQuit()) {
        // We will receive response synchronously, safe to put variables
        // on stack.
        example::EchoRequest request;
        example::EchoResponse response;
        brpc::Controller cntl;

        request.set_index(++counter);

        // Because `done'(last parameter) is NULL, this function waits until
        // the response comes back or error occurs(including timedout).
        stub.Echo(&cntl, &request, &response, NULL);
        if (!cntl.Failed()) {
            LOG(INFO) << "Received response[index=" << response.index()
                      << "] from " << cntl.remote_side()
                      << " to " << cntl.local_side()
                      << " latency=" << cntl.latency_us() << "us";
        } else {
            LOG(WARNING) << cntl.ErrorText();
        }
        sleep(1);
    }

    LOG(INFO) << "EchoClient is going to quit";
    return 0;
}