Page Speed Optimization Libraries  1.4.26.1
net/instaweb/util/public/cache_stats.h
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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 CacheInterface* Backend() { return cache_.get(); }
00059   virtual bool IsBlocking() const { return cache_->IsBlocking(); }
00060 
00061   virtual bool IsHealthy() const {
00062     return !shutdown_.value() && cache_->IsHealthy();
00063   }
00064 
00065   virtual void ShutDown() {
00066     shutdown_.set_value(true);
00067     cache_->ShutDown();
00068   }
00069 
00070  private:
00071   class StatsCallback;
00072   friend class StatsCallback;
00073 
00074   scoped_ptr<CacheInterface> cache_;
00075   Timer* timer_;
00076   Histogram* get_count_histogram_;
00077   Histogram* hit_latency_us_histogram_;
00078   Histogram* insert_latency_us_histogram_;
00079   Histogram* insert_size_bytes_histogram_;
00080   Histogram* lookup_size_bytes_histogram_;
00081   Variable* deletes_;
00082   Variable* hits_;
00083   Variable* inserts_;
00084   Variable* misses_;
00085   GoogleString name_;
00086   AtomicBool shutdown_;
00087 
00088   DISALLOW_COPY_AND_ASSIGN(CacheStats);
00089 };
00090 
00091 }  
00092 
00093 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_CACHE_STATS_H_
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