worker.h

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/*
 * Copyright 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http:///www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef PAGESPEED_KERNEL_THREAD_WORKER_H_
#define PAGESPEED_KERNEL_THREAD_WORKER_H_

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/scoped_ptr.h"
#include "pagespeed/kernel/base/string_util.h"

namespace net_instaweb {

class Function;
class ThreadSystem;
class Waveform;

class Worker {
 public:
  void Start();

  bool IsBusy();

  void ShutDown();

  void set_queue_size_stat(Waveform* x) { queue_size_ = x; }

 protected:
  Worker(StringPiece thread_name, ThreadSystem* runtime);
  virtual ~Worker();

  bool QueueIfPermitted(Function* closure);

  virtual bool IsPermitted(Function* closure) = 0;

  int NumJobs();

 private:
  class WorkThread;
  friend class WorkThread;

  void UpdateQueueSizeStat(int size);

  scoped_ptr<WorkThread> thread_;
  Waveform* queue_size_;

  
};

}  

#endif