降低回调频率提升执行器性能

doc/XXL-JOB官方文档.md

 - 5、路由策略代码重构；
 - 6、执行器重复注册问题修复；
 - 7、任务线程轮空30次后自动销毁，降低低频任务的无效线程消耗。
+- 8、执行器任务执行结果批量回调，降低回调频率提升执行器性能；
 
 #### TODO LIST
 - 1、任务权限管理：执行器为粒度分配权限，核心操作校验权限；
 - 6、任务依赖，流程图，子任务+会签任务，各节点日志；
 - 7、调度任务优先级；
 - 8、移除quartz依赖，重写调度模块：新增或恢复任务时将下次执行记录插入delayqueue，调度中心集群竞争分布式锁，成功节点批量加载到期delayqueue数据，批量执行。
-
+- 9、任务执行结果回调失败后重试：待定，防止回调死循环；
 
 ## 七、其他
 

xxl-job-admin/src/main/java/com/xxl/job/admin/controller/JobApiController.java

 import javax.annotation.Resource;
 import java.text.MessageFormat;
 import java.util.Date;
+import java.util.List;
 
 /**
  * Created by xuxueli on 17/5/10.
     @RequestMapping(value= AdminApiUtil.CALLBACK, method = RequestMethod.POST, consumes = "application/json")
     @ResponseBody
     @PermessionLimit(limit=false)
-    public ReturnT<String> callback(@RequestBody HandleCallbackParam handleCallbackParam){
+    public ReturnT<String> callback(@RequestBody List<HandleCallbackParam> callbackParamList){
 
+        for (HandleCallbackParam handleCallbackParam: callbackParamList) {
+            ReturnT<String> callbackResult = callback(handleCallbackParam);
+            logger.info("JobApiController.callback {}, handleCallbackParam={}, callbackResult={}",
+                    (callbackResult.getCode()==ReturnT.SUCCESS_CODE?"success":"fail"), handleCallbackParam, callbackResult);
+        }
+
+        return ReturnT.SUCCESS;
+    }
 
+    private ReturnT<String> callback(HandleCallbackParam handleCallbackParam) {
         // valid log item
         XxlJobLog log = xxlJobLogDao.load(handleCallbackParam.getLogId());
         if (log == null) {

xxl-job-core/src/main/java/com/xxl/job/core/thread/TriggerCallbackThread.java

 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.concurrent.LinkedBlockingQueue;
 
 /**
                     try {
                         HandleCallbackParam callback = getInstance().callBackQueue.take();
                         if (callback != null) {
-                            // callback
+
+                            // callback list
+                            List<HandleCallbackParam> callbackParamList = new ArrayList<HandleCallbackParam>();
+                            int drainToNum = getInstance().callBackQueue.drainTo(callbackParamList);
+                            callbackParamList.add(callback);
+
+                            // callback, will retry if error
                             try {
-                                ReturnT<String> callbackResult = AdminApiUtil.callApiFailover(AdminApiUtil.CALLBACK, callback);
-                                logger.info(">>>>>>>>>>> xxl-job callback, HandleCallbackParam:{}, callbackResult:{}", new Object[]{callback.toString(), callbackResult.toString()});
+                                ReturnT<String> callbackResult = AdminApiUtil.callApiFailover(AdminApiUtil.CALLBACK, callbackParamList);
+                                logger.info(">>>>>>>>>>> xxl-job callback, callbackParamList:{}, callbackResult:{}", new Object[]{callbackParamList, callbackResult});
                             } catch (Exception e) {
                                 logger.error(">>>>>>>>>>> xxl-job TriggerCallbackThread Exception:", e);
+                                //getInstance().callBackQueue.addAll(callbackParamList);
                             }
                         }
                     } catch (Exception e) {