Page Speed Optimization Libraries
1.2.24.1
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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 name_(StrCat("WriteThroughCache using backend 1 : ", cache1->Name(), 00043 " and backend 2 : ", cache2->Name())) {} 00044 00045 virtual ~WriteThroughCache(); 00046 00047 virtual void Get(const GoogleString& key, Callback* callback); 00048 virtual void Put(const GoogleString& key, SharedString* value); 00049 virtual void Delete(const GoogleString& key); 00050 00055 void set_cache1_limit(size_t limit) { cache1_size_limit_ = limit; } 00056 00057 CacheInterface* cache1() { return cache1_; } 00058 CacheInterface* cache2() { return cache2_; } 00059 virtual const char* Name() const { return name_.c_str(); } 00060 virtual bool IsBlocking() const { 00062 return cache1_->IsBlocking() && cache2_->IsBlocking(); 00063 } 00064 00065 virtual bool IsHealthy() const { 00066 return cache1_->IsHealthy() && cache2_->IsHealthy(); 00067 } 00068 00069 virtual void ShutDown() { 00070 cache1_->ShutDown(); 00071 cache2_->ShutDown(); 00072 } 00073 00074 private: 00075 void PutInCache1(const GoogleString& key, SharedString* value); 00076 friend class WriteThroughCallback; 00077 00078 CacheInterface* cache1_; 00079 CacheInterface* cache2_; 00080 size_t cache1_size_limit_; 00081 GoogleString name_; 00082 00083 DISALLOW_COPY_AND_ASSIGN(WriteThroughCache); 00084 }; 00085 00086 } 00087 00088 #endif ///< NET_INSTAWEB_UTIL_PUBLIC_WRITE_THROUGH_CACHE_H_