摘要：样例实现一实现二总个数总权重权重是否都一样累计总权重计算所有权重是否一样如果权重不相同且权重大于则按总权重数随机并确定随机值落在哪个片断上如果权重相同或权重为则均等随机想获取最新内容，请关注微信公众号
样例
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());
实现一
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
实现二
public String randomWeight(){
int length = serverMap.size(); // 总个数
int totalWeight = 0; // 总权重
boolean sameWeight = true; // 权重是否都一样
for (int i = 0; i < length; i++) {
int weight = serverMap.get(servers.get(i));
totalWeight += weight; // 累计总权重
if (sameWeight && i > 0
&& weight != serverMap.get(servers.get(i-1))) {
sameWeight = false; // 计算所有权重是否一样
}
}
if (totalWeight > 0 && ! sameWeight) {
// 如果权重不相同且权重大于0则按总权重数随机
int offset = ThreadLocalRandom.current().nextInt(totalWeight);
// 并确定随机值落在哪个片断上
for (int i = 0; i < length; i++) {
offset -= serverMap.get(servers.get(i));
if (offset < 0) {
return servers.get(i);
}
}
}
// 如果权重相同或权重为0则均等随机
return servers.get(ThreadLocalRandom.current().nextInt(length));
}
doc
dubbo-RandomLoadBalance
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