MS-405 Add delete task support

Former-commit-id: a1982d73b6d2f2bfdaa6e134f5efc401b5e4a113

cpp/src/scheduler/ResourceMgr.cpp

@@ -17,6 +17,17 @@ ResourceMgr::ResourceMgr()
 
 }
 
+uint64_t
+ResourceMgr::GetNumOfComputeResource() {
+    uint64_t count = 0;
+    for (auto &res : resources_) {
+        if (res->HasExecutor()) {
+            ++count;
+        }
+    }
+    return count;
+}
+
 ResourceWPtr
 ResourceMgr::Add(ResourcePtr &&resource) {
     ResourceWPtr ret(resource);

cpp/src/scheduler/ResourceMgr.h

@@ -35,6 +35,12 @@ public:
         return disk_resources_;
     }
 
+    /*
+     * Return account of resource which enable executor;
+     */
+    uint64_t
+    GetNumOfComputeResource();
+
     /*
      * Add resource into Resource Management;
      * Generate functions on events;