1 /* 2 * 3 * Copyright 2019 gRPC authors. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 // Package wrr contains the interface and common implementations of wrr 19 // algorithms. 20 package wrr 21 22 // WRR defines an interface that implements weighted round robin. 23 type WRR interface { 24 // Add adds an item with weight to the WRR set. Add must be only called 25 // before any calls to Next. 26 Add(item any, weight int64) 27 // Next returns the next picked item. 28 // 29 // Next needs to be thread safe. Add may not be called after any call to 30 // Next. 31 Next() any 32 } 33