执行器LFU策略功能实现
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@ -25,7 +25,7 @@ public abstract class ExecutorRouter {
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for (int i = 0; i < 100; i++) {
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String ret = ExecutorRouter.route(666, new ArrayList<String>(Arrays.asList("127.0.0.1:0000", "127.0.0.1:2222", "127.0.0.1:3333")), ExecutorRouteStrategyEnum.LEAST_RECENTLY_USED.name());
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String ret = ExecutorRouter.route(666, new ArrayList<String>(Arrays.asList("127.0.0.1:0000", "127.0.0.1:2222", "127.0.0.1:3333")), ExecutorRouteStrategyEnum.LEAST_FREQUENTLY_USED.name());
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System.out.println(ret);
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}
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@ -2,7 +2,8 @@ package com.xxl.job.admin.core.route.strategy;
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import com.xxl.job.admin.core.route.ExecutorRouter;
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import java.util.ArrayList;
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import java.util.*;
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import java.util.concurrent.ConcurrentHashMap;
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/**
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* 单个JOB对应的每个执行器,使用频率最低的优先被选举
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@ -13,12 +14,44 @@ import java.util.ArrayList;
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*/
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public class ExecutorRouteLFU extends ExecutorRouter {
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private static ConcurrentHashMap<Integer, HashMap<String, Integer>> jobLfuMap = new ConcurrentHashMap<Integer, HashMap<String, Integer>>();
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private static long CACHE_VALID_TIME = 0;
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@Override
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public String route(int jobId, ArrayList<String> addressList) {
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// TODO
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// cache clear
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if (System.currentTimeMillis() > CACHE_VALID_TIME) {
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jobLfuMap.clear();
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CACHE_VALID_TIME = System.currentTimeMillis() + 1000*60*60*24;
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}
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return addressList.get(0);
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// lfu item init
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HashMap<String, Integer> lfuItemMap = jobLfuMap.get(jobId); // Key排序可以用TreeMap+构造入参Compare;Value排序暂时只能通过ArrayList;
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if (lfuItemMap == null) {
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lfuItemMap = new HashMap<String, Integer>();
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jobLfuMap.put(jobId, lfuItemMap);
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}
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for (String address: addressList) {
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if (!lfuItemMap.containsKey(address)) {
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lfuItemMap.put(address, 0);
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}
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}
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// load least userd count address
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List<Map.Entry<String, Integer>> lfuItemList = new ArrayList<Map.Entry<String, Integer>>(lfuItemMap.entrySet());
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Collections.sort(lfuItemList, new Comparator<Map.Entry<String, Integer>>() {
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@Override
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public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
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return o1.getValue().compareTo(o2.getValue());
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}
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});
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Map.Entry<String, Integer> addressItem = lfuItemList.get(0);
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String minAddress = addressItem.getKey();
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addressItem.setValue(addressItem.getValue() + 1);
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return addressItem.getKey();
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}
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}
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