| /* |
| * 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. |
| */ |
| |
| package loadbalance |
| |
| import ( |
| "time" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go/common/constant" |
| "github.com/apache/dubbo-go/protocol" |
| ) |
| |
| // GetWeight gets weight for load balance strategy |
| func GetWeight(invoker protocol.Invoker, invocation protocol.Invocation) int64 { |
| var weight int64 |
| url := invoker.GetUrl() |
| // Multiple registry scenario, load balance among multiple registries. |
| isRegIvk := url.GetParamBool(constant.REGISTRY_KEY+"."+constant.REGISTRY_LABEL_KEY, false) |
| if isRegIvk { |
| weight = url.GetParamInt(constant.REGISTRY_KEY+"."+constant.WEIGHT_KEY, constant.DEFAULT_WEIGHT) |
| } else { |
| weight = url.GetMethodParamInt64(invocation.MethodName(), constant.WEIGHT_KEY, constant.DEFAULT_WEIGHT) |
| |
| if weight > 0 { |
| //get service register time an do warm up time |
| now := time.Now().Unix() |
| timestamp := url.GetParamInt(constant.REMOTE_TIMESTAMP_KEY, now) |
| if uptime := now - timestamp; uptime > 0 { |
| warmup := url.GetParamInt(constant.WARMUP_KEY, constant.DEFAULT_WARMUP) |
| if uptime < warmup { |
| if ww := float64(uptime) / float64(warmup) / float64(weight); ww < 1 { |
| weight = 1 |
| } else if int64(ww) <= weight { |
| weight = int64(ww) |
| } |
| } |
| } |
| } |
| } |
| |
| if weight < 0 { |
| weight = 0 |
| } |
| |
| return weight |
| } |