修复memcache监控bug

@@ -42,6 +42,8 @@ public class MemcachedMonitService {
         Map<String, List<MObjectInfo>> memcachedMap = queryAllMoListByLogic("memcached");
 
         if (memcachedMap.isEmpty()) {
+            //要监控内容为空，则清空map
+            MemConstants.MEMCACHED_RELATE_MAP.clear();
             return;
         }
 
@@ -52,6 +54,14 @@ public class MemcachedMonitService {
             executorService.submit(new MemcachedTask(entry.getKey(), entry.getValue()));
         }
 
+
+        for(String key:MemConstants.MEMCACHED_RELATE_MAP.keySet()){
+            //把被移除的对象从缓存中清除
+            if(!memcachedMap.keySet().contains(key)){
+                MemConstants.MEMCACHED_RELATE_MAP.remove(key);
+            }
+        }
+
         executorService.shutdown();
     }