Page Speed Optimization Libraries  1.2.24.1
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 
00028 namespace net_instaweb {
00029 
00030 class Function;
00031 class ThreadSystem;
00032 class Waveform;
00033 
00041 class Worker {
00042  public:
00044   void Start();
00045 
00048   bool IsBusy();
00049 
00053   void ShutDown();
00054 
00058   void set_queue_size_stat(Waveform* x) { queue_size_ = x; }
00059 
00060  protected:
00061   explicit Worker(ThreadSystem* runtime);
00062   virtual ~Worker();
00063 
00069   bool QueueIfPermitted(Function* closure);
00070 
00073   virtual bool IsPermitted(Function* closure) = 0;
00074 
00080   int NumJobs();
00081 
00082  private:
00083   class WorkThread;
00084   friend class WorkThread;
00085 
00087   void UpdateQueueSizeStat(int size);
00088 
00089   scoped_ptr<WorkThread> thread_;
00090   Waveform* queue_size_;
00091 
00092   DISALLOW_COPY_AND_ASSIGN(Worker);
00093 };
00094 
00095 }  
00096 
00097 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_WORKER_H_
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