| // 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. |
| |
| /// The Injectable implementation supports inject the give key/value for further propagation, |
| /// especially in across process propagation. |
| /// Such as putting a key/value into the HTTP header. |
| pub trait Injectable { |
| /// Inject the given key/value into the implementation. |
| /// The way of injection is determined by the implementation, no panic! should happens even injection fails. |
| fn inject(key: String, value: String); |
| } |
