cluster/loadbalance/util.go

/*
 * 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 ...
func GetWeight(invoker protocol.Invoker, invocation protocol.Invocation) int64 {
	url := invoker.GetUrl()
	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)
				}
			}
		}
	}
	return weight
}