/*
 * 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.
 *
 */

syntax = "proto3";

option java_multiple_files = true;
option java_package = "org.apache.skywalking.apm.network.language.agent.v3.compat";
option csharp_namespace = "SkyWalking.NetworkProtocol.V3.Compat";
option go_package = "skywalking.apache.org/repo/goapi/collect/language/agent/v3/compat";
option deprecated = true;

import "common/Common.proto";
import "language-agent/Tracing.proto";

// Define a trace segment report service.
// All language agents or any trace collecting component, could use this service to send span collection to the SkyWalking OAP backend.
service TraceSegmentReportService {
    // Recommended trace segment report channel.
    // gRPC streaming provides better performance.
    // All language agents should choose this.
    rpc collect (stream skywalking.v3.SegmentObject) returns (skywalking.v3.Commands) {
    }

    // An alternative for trace report by using gRPC unary
    // This is provided for some 3rd-party integration, if and only if they prefer the unary mode somehow.
    // The performance of SkyWalking OAP server would be very similar with streaming report,
    // the performance of the network and client side are affected
    rpc collectInSync (skywalking.v3.SegmentCollection) returns (skywalking.v3.Commands) {
    }
}