Page Speed Optimization Libraries  1.4.26.1
net/instaweb/util/public/simple_stats.h
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00001 /*
00002  * Copyright 2010 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 
00018 
00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_SIMPLE_STATS_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_SIMPLE_STATS_H_
00021 
00022 #include "net/instaweb/util/public/basictypes.h"
00023 #include "net/instaweb/util/public/scoped_ptr.h"
00024 #include "net/instaweb/util/public/statistics.h"
00025 #include "net/instaweb/util/public/statistics_template.h"
00026 #include "net/instaweb/util/public/string.h"
00027 #include "net/instaweb/util/public/string_util.h"
00028 
00029 namespace net_instaweb {
00030 
00031 class AbstractMutex;
00032 class ThreadSystem;
00033 
00034 class SimpleStatsVariable : public Variable {
00035  public:
00036   explicit SimpleStatsVariable(AbstractMutex* mutex);
00037   virtual ~SimpleStatsVariable();
00038   virtual int64 Get() const;
00039   virtual void Set(int64 value);
00040   virtual int64 Add(int delta);
00041   virtual StringPiece GetName() const { return StringPiece(NULL); }
00042 
00043  private:
00044   int64 value_;
00045   scoped_ptr<AbstractMutex> mutex_;
00046   DISALLOW_COPY_AND_ASSIGN(SimpleStatsVariable);
00047 };
00048 
00050 class SimpleStats : public ScalarStatisticsTemplate<SimpleStatsVariable> {
00051  public:
00052   SimpleStats();
00053   virtual ~SimpleStats();
00054 
00055  protected:
00056   virtual SimpleStatsVariable* NewVariable(const StringPiece& name, int index);
00057 
00058  private:
00059   scoped_ptr<ThreadSystem> thread_system_;
00060 
00061   DISALLOW_COPY_AND_ASSIGN(SimpleStats);
00062 };
00063 
00064 }  
00065 
00066 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_SIMPLE_STATS_H_
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