摘要：樣例實現(xiàn)一實現(xiàn)二總個數(shù)總權(quán)重權(quán)重是否都一樣累計總權(quán)重計算所有權(quán)重是否一樣如果權(quán)重不相同且權(quán)重大于則按總權(quán)重數(shù)隨機并確定隨機值落在哪個片斷上如果權(quán)重相同或權(quán)重為則均等隨機想獲取最新內(nèi)容，請關(guān)注微信公眾號
樣例
private Map serverMap = new HashMap(){{
put("192.168.1.100",1);
put("192.168.1.101",1);
put("192.168.1.102",4);
put("192.168.1.103",1);
put("192.168.1.104",1);
put("192.168.1.105",3);
put("192.168.1.106",1);
put("192.168.1.107",2);
put("192.168.1.108",1);
put("192.168.1.109",1);
put("192.168.1.110",1);
}};
private List servers = new ArrayList<>(serverMap.keySet());
實現(xiàn)一
public void weightRandom(){
Set keySet = serverMap.keySet();
List servers = new ArrayList();
for(Iterator it = keySet.iterator();it.hasNext();){
String server = it.next();
int weight = serverMap.get(server);
for(int i=0;i
實現(xiàn)二
public String randomWeight(){
int length = serverMap.size(); // 總個數(shù)
int totalWeight = 0; // 總權(quán)重
boolean sameWeight = true; // 權(quán)重是否都一樣
for (int i = 0; i < length; i++) {
int weight = serverMap.get(servers.get(i));
totalWeight += weight; // 累計總權(quán)重
if (sameWeight && i > 0
&& weight != serverMap.get(servers.get(i-1))) {
sameWeight = false; // 計算所有權(quán)重是否一樣
}
}
if (totalWeight > 0 && ! sameWeight) {
// 如果權(quán)重不相同且權(quán)重大于0則按總權(quán)重數(shù)隨機
int offset = ThreadLocalRandom.current().nextInt(totalWeight);
// 并確定隨機值落在哪個片斷上
for (int i = 0; i < length; i++) {
offset -= serverMap.get(servers.get(i));
if (offset < 0) {
return servers.get(i);
}
}
}
// 如果權(quán)重相同或權(quán)重為0則均等隨機
return servers.get(ThreadLocalRandom.current().nextInt(length));
}
doc
dubbo-RandomLoadBalance
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