Adding tests.

@@ -41,10 +41,15 @@ public final class RingBufferWheel {
     private AtomicInteger taskSize = new AtomicInteger();
 
     /***
-     * task running sign
+     * task stop sign
      */
     private volatile boolean stop = false;
 
+    /**
+     * task start sign
+     */
+    private volatile boolean start = false ;
+
     private Lock lock = new ReentrantLock();
     private Condition condition = lock.newCondition();
 
@@ -98,6 +103,7 @@ public final class RingBufferWheel {
 
         taskSize.incrementAndGet();
 
+        start();
     }
 
     /**
@@ -112,10 +118,13 @@ public final class RingBufferWheel {
      * Start background thread to consumer wheel timer, it will run until you call method {@link #stop}
      */
     public void start() {
-        logger.info("delay task is starting");
-        Thread job = new Thread(new TriggerJob());
-        job.setName("consumer RingBuffer thread");
-        job.start();
+        if (!start){
+            logger.info("delay task is starting");
+            Thread job = new Thread(new TriggerJob());
+            job.setName("consumer RingBuffer thread");
+            job.start();
+            start = true ;
+        }
     }
 
     /**

 package com.crossoverjie.cim.common.data.construct;
 
-import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -13,7 +12,7 @@ public class RingBufferWheelTest {
     private static Logger logger = LoggerFactory.getLogger(RingBufferWheelTest.class) ;
 
     public static void main(String[] args) throws InterruptedException {
-        test5();
+        test1();
 
         return;
     }
@@ -30,8 +29,6 @@ public class RingBufferWheelTest {
         task.setKey(74);
         wheel.addTask(task) ;
 
-        wheel.start();
-
         while (true){
             logger.info("task size={}" , wheel.taskSize());
             TimeUnit.SECONDS.sleep(1);
@@ -117,8 +114,6 @@ public class RingBufferWheelTest {
             wheel.addTask(task);
         }
 
-        wheel.start();
-
         logger.info("task size={}",wheel.taskSize());
 
         wheel.stop(false);
@@ -134,6 +129,32 @@ public class RingBufferWheelTest {
             logger.info("================");
         }
     }
+    private static void cuncrrentTest6() throws InterruptedException {
+        ExecutorService executorService = Executors.newFixedThreadPool(10) ;
+
+        RingBufferWheel wheel = new RingBufferWheel(executorService) ;
+
+        for (int i = 0; i < 10; i++) {
+
+            RingBufferWheel.Task task = new Job(i) ;
+            task.setKey(i);
+            wheel.addTask(task);
+        }
+
+        wheel.start();
+
+        TimeUnit.SECONDS.sleep(10);
+        RingBufferWheel.Task task = new Job(15) ;
+        task.setKey(15);
+        wheel.addTask(task);
+        wheel.start();
+
+        logger.info("task size={}",wheel.taskSize());
+
+        wheel.stop(false);
+
+
+    }
 
     private static class Job extends RingBufferWheel.Task{