Page Speed Optimization Libraries  1.3.25.1
net/instaweb/util/public/waveform.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 
00018 
00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_WAVEFORM_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_WAVEFORM_H_
00021 
00022 #include <utility>                      
00023 
00024 #include "net/instaweb/util/public/basictypes.h"
00025 #include "net/instaweb/util/public/scoped_ptr.h"
00026 #include "net/instaweb/util/public/string_util.h"
00027 
00028 namespace net_instaweb {
00029 
00030 class AbstractMutex;
00031 class MessageHandler;
00032 class ThreadSystem;
00033 class Timer;
00034 class Writer;
00035 
00044 class Waveform {
00045  public:
00046   Waveform(ThreadSystem* thread_system, Timer* timer, int capacity);
00047 
00048   void Clear();
00049   double Average();
00050   double Maximum();
00051   double Minimum();
00052   int Size();
00053 
00055   void Add(double value);
00056 
00059   void AddDelta(double delta);
00060 
00064   static void RenderHeader(Writer* writer, MessageHandler* handler);
00065 
00067   void Render(const StringPiece& title, const StringPiece& label,
00068               Writer* writer, MessageHandler* handler);
00069 
00070  private:
00071   typedef std::pair<int64, double> TimeValue;
00072 
00073   TimeValue* GetSample(int index); 
00074   void AddHelper(double value); 
00075 
00076   Timer* timer_;
00077   int capacity_;
00078   scoped_array<TimeValue> samples_;
00079   int start_index_;
00080   int size_;
00081   int64 first_sample_timestamp_us_;
00082   double total_since_clear_;
00083   double min_;
00084   double max_;
00085   double previous_value_;
00086   scoped_ptr<AbstractMutex> mutex_; 
00087 
00088   DISALLOW_COPY_AND_ASSIGN(Waveform);
00089 };
00090 
00091 }  
00092 
00093 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_WAVEFORM_H_
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