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- // Licensed to the Apache Software Foundation (ASF) under one
- // or more contributor license agreements. See the NOTICE file
- // distributed with this work for additional information
- // regarding copyright ownership. The ASF licenses this file
- // to you under the Apache License, Version 2.0 (the
- // "License"); you may not use this file except in compliance
- // with the License. You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing,
- // software distributed under the License is distributed on an
- // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- // KIND, either express or implied. See the License for the
- // specific language governing permissions and limitations
- // under the License.
- // A client to send 2 requests to server and accept the first returned response.
- #include <gflags/gflags.h>
- #include <butil/logging.h>
- #include <butil/time.h>
- #include <brpc/channel.h>
- #include "echo.pb.h"
- DEFINE_string(protocol, "baidu_std", "Protocol type. Defined in src/brpc/options.proto");
- DEFINE_string(connection_type, "", "Connection type. Available values: single, pooled, short");
- DEFINE_string(server, "0.0.0.0:8000", "IP Address of server");
- DEFINE_string(load_balancer, "", "The algorithm for load balancing");
- DEFINE_int32(timeout_ms, 100, "RPC timeout in milliseconds");
- DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)");
- // A special done for canceling another RPC.
- class CancelRPC : public google::protobuf::Closure {
- public:
- explicit CancelRPC(brpc::CallId rpc_id) : _rpc_id(rpc_id) {}
-
- void Run() {
- brpc::StartCancel(_rpc_id);
- }
-
- private:
- brpc::CallId _rpc_id;
- };
- int main(int argc, char* argv[]) {
- // Parse gflags. We recommend you to use gflags as well.
- GFLAGS_NS::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;
- 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 log_id = 0;
- while (!brpc::IsAskedToQuit()) {
- example::EchoRequest request1;
- example::EchoResponse response1;
- brpc::Controller cntl1;
- example::EchoRequest request2;
- example::EchoResponse response2;
- brpc::Controller cntl2;
- request1.set_message("hello1");
- request2.set_message("hello2");
-
- cntl1.set_log_id(log_id ++); // set by user
- cntl2.set_log_id(log_id ++);
- const brpc::CallId id1 = cntl1.call_id();
- const brpc::CallId id2 = cntl2.call_id();
- CancelRPC done1(id2);
- CancelRPC done2(id1);
-
- butil::Timer tm;
- tm.start();
- // Send 2 async calls and join them. They will cancel each other in
- // their done which is run before the RPC being Join()-ed. Canceling
- // a finished RPC has no effect.
- // For example:
- // Time RPC1 RPC2
- // 1 response1 comes back.
- // 2 running done1.
- // 3 cancel RPC2
- // 4 running done2 (NOTE: done also runs)
- // 5 cancel RPC1 (no effect)
- stub.Echo(&cntl1, &request1, &response1, &done1);
- stub.Echo(&cntl2, &request2, &response2, &done2);
- brpc::Join(id1);
- brpc::Join(id2);
- tm.stop();
- if (cntl1.Failed() && cntl2.Failed()) {
- LOG(WARNING) << "Both failed. rpc1:" << cntl1.ErrorText()
- << ", rpc2: " << cntl2.ErrorText();
- } else if (!cntl1.Failed()) {
- LOG(INFO) << "Received `" << response1.message() << "' from rpc1="
- << id1.value << '@' << cntl1.remote_side()
- << " latency=" << tm.u_elapsed() << "us"
- << " rpc1_latency=" << cntl1.latency_us() << "us"
- << " rpc2_latency=" << cntl2.latency_us() << "us";
- } else {
- LOG(INFO) << "Received `" << response2.message() << "' from rpc2="
- << id2.value << '@' << cntl2.remote_side()
- << " latency=" << tm.u_elapsed() << "us"
- << " rpc1_latency=" << cntl1.latency_us() << "us"
- << " rpc2_latency=" << cntl2.latency_us() << "us";
- }
- sleep(1);
- }
- LOG(INFO) << "EchoClient is going to quit";
- return 0;
- }
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