Page Speed Optimization Libraries  1.4.26.1
net/instaweb/util/public/worker.h
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00001 /*
00002  * Copyright 2011 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00021 
00022 #ifndef NET_INSTAWEB_UTIL_PUBLIC_WORKER_H_
00023 #define NET_INSTAWEB_UTIL_PUBLIC_WORKER_H_
00024 
00025 #include "net/instaweb/util/public/basictypes.h"
00026 #include "net/instaweb/util/public/scoped_ptr.h"
00027 #include "net/instaweb/util/public/string_util.h"
00028 
00029 namespace net_instaweb {
00030 
00031 class Function;
00032 class ThreadSystem;
00033 class Waveform;
00034 
00042 class Worker {
00043  public:
00045   void Start();
00046 
00049   bool IsBusy();
00050 
00054   void ShutDown();
00055 
00059   void set_queue_size_stat(Waveform* x) { queue_size_ = x; }
00060 
00061  protected:
00062   Worker(StringPiece thread_name, ThreadSystem* runtime);
00063   virtual ~Worker();
00064 
00070   bool QueueIfPermitted(Function* closure);
00071 
00074   virtual bool IsPermitted(Function* closure) = 0;
00075 
00081   int NumJobs();
00082 
00083  private:
00084   class WorkThread;
00085   friend class WorkThread;
00086 
00088   void UpdateQueueSizeStat(int size);
00089 
00090   scoped_ptr<WorkThread> thread_;
00091   Waveform* queue_size_;
00092 
00093   DISALLOW_COPY_AND_ASSIGN(Worker);
00094 };
00095 
00096 }  
00097 
00098 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_WORKER_H_
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