Page Speed Optimization Libraries  1.5.27.2
net/instaweb/util/public/compressed_cache.h
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00001 /*
00002  * Copyright 2013 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_COMPRESSED_CACHE_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_COMPRESSED_CACHE_H_
00021 
00022 #include "net/instaweb/util/public/basictypes.h"
00023 #include "net/instaweb/util/public/cache_interface.h"
00024 #include "net/instaweb/util/public/string.h"
00025 #include "pagespeed/kernel/base/string_util.h"
00026 
00027 namespace net_instaweb {
00028 
00029 class Histogram;
00030 class SharedString;
00031 class Statistics;
00032 class Variable;
00033 
00035 class CompressedCache : public CacheInterface {
00036  public:
00038   CompressedCache(CacheInterface* cache, Statistics* stats);
00039   virtual ~CompressedCache();
00040 
00041   static void InitStats(Statistics* stats);
00042 
00043   virtual void Get(const GoogleString& key, Callback* callback);
00044   virtual void Put(const GoogleString& key, SharedString* value);
00045   virtual void Delete(const GoogleString& key);
00046   virtual GoogleString Name() const { return FormatName(cache_->Name()); }
00047   static GoogleString FormatName(StringPiece cache);
00048   virtual CacheInterface* Backend() { return cache_; }
00049   virtual bool IsBlocking() const { return cache_->IsBlocking(); }
00050   virtual bool IsHealthy() const;
00051   virtual void ShutDown();
00052 
00055   int64 CorruptPayloads() const;
00056 
00059   int64 OriginalSize() const;
00060 
00063   int64 CompressedSize() const;
00064 
00065  private:
00066   CacheInterface* cache_;
00067   Histogram* compressed_cache_savings_;
00068   Variable* corrupt_payloads_;
00069   Variable* original_size_;
00070   Variable* compressed_size_;
00071 
00072   DISALLOW_COPY_AND_ASSIGN(CompressedCache);
00073 };
00074 
00075 }  
00076 
00077 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_COMPRESSED_CACHE_H_
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