Page Speed Optimization Libraries  1.2.24.1
net/instaweb/util/public/cache_stats.h
Go to the documentation of this file.
00001 /*
00002  * Copyright 2012 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_CACHE_STATS_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_CACHE_STATS_H_
00021 
00022 #include "net/instaweb/util/public/atomic_bool.h"
00023 #include "net/instaweb/util/public/basictypes.h"
00024 #include "net/instaweb/util/public/cache_interface.h"
00025 #include "net/instaweb/util/public/scoped_ptr.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 Histogram;
00032 class SharedString;
00033 class Statistics;
00034 class Timer;
00035 class Variable;
00036 
00041 class CacheStats : public CacheInterface {
00042  public:
00044   CacheStats(StringPiece prefix,
00045              CacheInterface* cache,
00046              Timer* timer,
00047              Statistics* statistics);
00048   virtual ~CacheStats();
00049 
00051   static void InitStats(StringPiece prefix, Statistics* statistics);
00052 
00053   virtual void Get(const GoogleString& key, Callback* callback);
00054   virtual void MultiGet(MultiGetRequest* request);
00055   virtual void Put(const GoogleString& key, SharedString* value);
00056   virtual void Delete(const GoogleString& key);
00057   virtual const char* Name() const { return name_.c_str(); }
00058   virtual bool IsBlocking() const { return cache_->IsBlocking(); }
00059 
00060   virtual bool IsHealthy() const {
00061     return !shutdown_.value() && cache_->IsHealthy();
00062   }
00063 
00064   virtual void ShutDown() {
00065     shutdown_.set_value(true);
00066     cache_->ShutDown();
00067   }
00068 
00069  private:
00070   class StatsCallback;
00071   friend class StatsCallback;
00072 
00073   scoped_ptr<CacheInterface> cache_;
00074   Timer* timer_;
00075   Histogram* get_count_histogram_;
00076   Histogram* hit_latency_us_histogram_;
00077   Histogram* insert_latency_us_histogram_;
00078   Histogram* insert_size_bytes_histogram_;
00079   Histogram* lookup_size_bytes_histogram_;
00080   Variable* deletes_;
00081   Variable* hits_;
00082   Variable* inserts_;
00083   Variable* misses_;
00084   GoogleString name_;
00085   AtomicBool shutdown_;
00086 
00087   DISALLOW_COPY_AND_ASSIGN(CacheStats);
00088 };
00089 
00090 }  
00091 
00092 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_CACHE_STATS_H_
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Defines