Page Speed Optimization Libraries
1.6.29.3
|
00001 /* 00002 * Copyright 2010 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_WRITE_THROUGH_CACHE_H_ 00020 #define NET_INSTAWEB_UTIL_PUBLIC_WRITE_THROUGH_CACHE_H_ 00021 00022 #include <cstddef> 00023 #include "net/instaweb/util/public/basictypes.h" 00024 #include "net/instaweb/util/public/cache_interface.h" 00025 #include "net/instaweb/util/public/string.h" 00026 #include "net/instaweb/util/public/string_util.h" 00027 00028 namespace net_instaweb { 00029 00030 class SharedString; 00031 00033 class WriteThroughCache : public CacheInterface { 00034 public: 00035 static const size_t kUnlimited; 00036 00038 WriteThroughCache(CacheInterface* cache1, CacheInterface* cache2) 00039 : cache1_(cache1), 00040 cache2_(cache2), 00041 cache1_size_limit_(kUnlimited) { 00042 } 00043 00044 virtual ~WriteThroughCache(); 00045 00046 virtual void Get(const GoogleString& key, Callback* callback); 00047 virtual void Put(const GoogleString& key, SharedString* value); 00048 virtual void Delete(const GoogleString& key); 00049 00054 void set_cache1_limit(size_t limit) { cache1_size_limit_ = limit; } 00055 size_t cache1_limit() const { return cache1_size_limit_; } 00056 00057 CacheInterface* cache1() { return cache1_; } 00058 CacheInterface* cache2() { return cache2_; } 00059 virtual bool IsBlocking() const { 00061 return cache1_->IsBlocking() && cache2_->IsBlocking(); 00062 } 00063 00064 virtual bool IsHealthy() const { 00065 return cache1_->IsHealthy() && cache2_->IsHealthy(); 00066 } 00067 00068 virtual void ShutDown() { 00069 cache1_->ShutDown(); 00070 cache2_->ShutDown(); 00071 } 00072 00073 virtual GoogleString Name() const { 00074 return FormatName(cache1_->Name(), cache2_->Name()); 00075 } 00076 static GoogleString FormatName(StringPiece l1, StringPiece l2); 00077 00078 private: 00079 void PutInCache1(const GoogleString& key, SharedString* value); 00080 friend class WriteThroughCallback; 00081 00082 CacheInterface* cache1_; 00083 CacheInterface* cache2_; 00084 size_t cache1_size_limit_; 00085 00086 DISALLOW_COPY_AND_ASSIGN(WriteThroughCache); 00087 }; 00088 00089 } 00090 00091 #endif ///< NET_INSTAWEB_UTIL_PUBLIC_WRITE_THROUGH_CACHE_H_