Page Speed Optimization Libraries  1.4.26.1
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 Variable;
00035 class Writer;
00036 
00045 class Waveform {
00046  public:
00047   Waveform(ThreadSystem* thread_system, Timer* timer, int capacity,
00048            Variable* metric);
00049 
00050   void Clear();
00051   double Average();
00052   double Maximum();
00053   double Minimum();
00054   int Size();
00055 
00057   void Add(double value);
00058 
00061   void AddDelta(double delta);
00062 
00066   static void RenderHeader(Writer* writer, MessageHandler* handler);
00067 
00069   void Render(const StringPiece& title, const StringPiece& label,
00070               Writer* writer, MessageHandler* handler);
00071 
00072  private:
00073   typedef std::pair<int64, double> TimeValue;
00074 
00075   TimeValue* GetSample(int index); 
00076   void AddHelper(double value); 
00077 
00078   Timer* timer_;
00079   int capacity_;
00080   scoped_array<TimeValue> samples_;
00081   int start_index_;
00082   int size_;
00083   int64 first_sample_timestamp_us_;
00084   double total_since_clear_;
00085   double min_;
00086   double max_;
00087   double previous_value_;
00088   scoped_ptr<AbstractMutex> mutex_; 
00089 
00092   Variable* metric_;
00093 
00094   DISALLOW_COPY_AND_ASSIGN(Waveform);
00095 };
00096 
00097 }  
00098 
00099 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_WAVEFORM_H_
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