| 提交 | 用户 | 时间 | ||
| e7c126 | 1 | package com.xxl.job.admin.core.route.strategy; |
| H | 2 | |
| 3 | import com.xxl.job.admin.core.route.ExecutorRouter; | |
| 4 | import com.xxl.job.core.biz.model.ReturnT; | |
| 5 | import com.xxl.job.core.biz.model.TriggerParam; | |
| 6 | ||
| 7 | import java.util.ArrayList; | |
| 8 | import java.util.LinkedHashMap; | |
| 9 | import java.util.List; | |
| 10 | import java.util.concurrent.ConcurrentHashMap; | |
| 11 | import java.util.concurrent.ConcurrentMap; | |
| 12 | ||
| 13 | /** | |
| 14 | * 单个JOB对应的每个执行器，最久为使用的优先被选举 | |
| 15 | * a、LFU(Least Frequently Used)：最不经常使用，频率/次数 | |
| 16 | * b(*)、LRU(Least Recently Used)：最近最久未使用，时间 | |
| 17 | * | |
| 18 | * Created by xuxueli on 17/3/10. | |
| 19 | */ | |
| 20 | public class ExecutorRouteLRU extends ExecutorRouter { | |
| 21 | ||
| 22 | private static ConcurrentMap<Integer, LinkedHashMap<String, String>> jobLRUMap = new ConcurrentHashMap<Integer, LinkedHashMap<String, String>>(); | |
| 23 | private static long CACHE_VALID_TIME = 0; | |
| 24 | ||
| 25 | public String route(int jobId, List<String> addressList) { | |
| 26 | ||
| 27 | // cache clear | |
| 28 | if (System.currentTimeMillis() > CACHE_VALID_TIME) { | |
| 29 | jobLRUMap.clear(); | |
| 30 | CACHE_VALID_TIME = System.currentTimeMillis() + 1000*60*60*24; | |
| 31 | } | |
| 32 | ||
| 33 | // init lru | |
| 34 | LinkedHashMap<String, String> lruItem = jobLRUMap.get(jobId); | |
| 35 | if (lruItem == null) { | |
| 36 | /** | |
| 37 | * LinkedHashMap | |
| 38 | * a、accessOrder：true=访问顺序排序（get/put时排序）；false=插入顺序排期； | |
| 39 | * b、removeEldestEntry：新增元素时将会调用，返回true时会删除最老元素；可封装LinkedHashMap并重写该方法，比如定义最大容量，超出是返回true即可实现固定长度的LRU算法； | |
| 40 | */ | |
| 41 | lruItem = new LinkedHashMap<String, String>(16, 0.75f, true); | |
| 42 | jobLRUMap.putIfAbsent(jobId, lruItem); | |
| 43 | } | |
| 44 | ||
| 45 | // put new | |
| 46 | for (String address: addressList) { | |
| 47 | if (!lruItem.containsKey(address)) { | |
| 48 | lruItem.put(address, address); | |
| 49 | } | |
| 50 | } | |
| 51 | // remove old | |
| 52 | List<String> delKeys = new ArrayList<>(); | |
| 53 | for (String existKey: lruItem.keySet()) { | |
| 54 | if (!addressList.contains(existKey)) { | |
| 55 | delKeys.add(existKey); | |
| 56 | } | |
| 57 | } | |
| 58 | if (delKeys.size() > 0) { | |
| 59 | for (String delKey: delKeys) { | |
| 60 | lruItem.remove(delKey); | |
| 61 | } | |
| 62 | } | |
| 63 | ||
| 64 | // load | |
| 65 | String eldestKey = lruItem.entrySet().iterator().next().getKey(); | |
| 66 | String eldestValue = lruItem.get(eldestKey); | |
| 67 | return eldestValue; | |
| 68 | } | |
| 69 | ||
| 70 | @Override | |
| 71 | public ReturnT<String> route(TriggerParam triggerParam, List<String> addressList) { | |
| 72 | String address = route(triggerParam.getJobId(), addressList); | |
| 73 | return new ReturnT<String>(address); | |
| 74 | } | |
| 75 | ||
| 76 | } | |
