修复阻塞处理策略设置为“丢弃后续调度“，只有第一次调度正常执行，后面的所有调度都被丢弃了的问题

build/releasenotes.props

@@ -3,6 +3,7 @@
 		<DotXxlJobPackageNotes>
 		1. 修改异步方式读取RequestBody 
 		2. 兼容xxl-jobv2.3版本回调函数参数变更的问题
+		3. 修复阻塞处理策略设置为“丢弃后续调度“，只有第一次调度正常执行，后面的所有调度都被丢弃了的问题
 		</DotXxlJobPackageNotes> 		
 	</PropertyGroup>
 </Project>

build/version.props

@@ -1,5 +1,5 @@
 <Project>
 	<PropertyGroup>
-		<DotXxlJobPackageVersion>2.3.0</DotXxlJobPackageVersion>
+		<DotXxlJobPackageVersion>2.3.1</DotXxlJobPackageVersion>
 	</PropertyGroup>
 </Project>

samples/ASPNetCoreExecutor/DemoJobHandler.cs

@@ -10,11 +10,14 @@ namespace ASPNetCoreExecutor
     [JobHandler("demoJobHandler")]
     public class DemoJobHandler:AbstractJobHandler
     {
-        public override Task<ReturnT> Execute(JobExecuteContext context)
+        public override async Task<ReturnT> Execute(JobExecuteContext context)
         {            
             context.JobLogger.Log("receive demo job handler,parameter:{0}",context.JobParameter);
-
+            context.JobLogger.Log("开始休眠120秒");
-            return Task.FromResult(ReturnT.SUCCESS);
+            //
+            await Task.Delay(10 * 1000);
+            context.JobLogger.Log("休眠120秒结束");
+            return ReturnT.SUCCESS;
         }
     }
 }

src/DotXxlJob.Core/JobDispatcher.cs

@@ -82,7 +82,12 @@ namespace DotXxlJob.Core
                 //丢弃后续的
                 if (Constants.ExecutorBlockStrategy.DISCARD_LATER == triggerParam.ExecutorBlockStrategy)
                 {
-                     return ReturnT.Failed($"block strategy effect：{triggerParam.ExecutorBlockStrategy}");
+                    //存在还没执行完成的任务
+                    if (taskQueue.IsRunning())
+                    {
+                        return ReturnT.Failed($"block strategy effect：{triggerParam.ExecutorBlockStrategy}");
+                    }
+                    //否则还是继续做
                 }
                 //覆盖较早的
                 if (Constants.ExecutorBlockStrategy.COVER_EARLY == triggerParam.ExecutorBlockStrategy)

src/DotXxlJob.Core/Queue/JobTaskQueue.cs

@@ -30,6 +30,13 @@ namespace DotXxlJob.Core
 
        
         
+       
+        public bool IsRunning()
+        {
+            return _cancellationTokenSource !=null;
+        }
+            
+
        /// <summary>
        /// 覆盖之前的队列
        /// </summary>