Page Speed Optimization Libraries
1.5.27.2
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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_FALLBACK_CACHE_H_ 00020 #define NET_INSTAWEB_UTIL_PUBLIC_FALLBACK_CACHE_H_ 00021 00022 #include <cstddef> 00023 00024 #include "net/instaweb/util/public/basictypes.h" 00025 #include "net/instaweb/util/public/cache_interface.h" 00026 #include "net/instaweb/util/public/string.h" 00027 #include "pagespeed/kernel/base/string_util.h" 00028 00029 namespace net_instaweb { 00030 00031 class MessageHandler; 00032 class SharedString; 00033 00039 class FallbackCache : public CacheInterface { 00040 public: 00044 FallbackCache(CacheInterface* small_object_cache, 00045 CacheInterface* large_object_cache, 00046 int threshold_bytes, 00047 MessageHandler* handler); 00048 virtual ~FallbackCache(); 00049 00050 virtual void Get(const GoogleString& key, Callback* callback); 00051 virtual void Put(const GoogleString& key, SharedString* value); 00052 virtual void Delete(const GoogleString& key); 00053 virtual void MultiGet(MultiGetRequest* request); 00054 virtual bool IsBlocking() const { 00056 return (small_object_cache_->IsBlocking() && 00057 large_object_cache_->IsBlocking()); 00058 } 00059 00060 virtual bool IsHealthy() const { 00061 return (small_object_cache_->IsHealthy() && 00062 large_object_cache_->IsHealthy()); 00063 } 00064 00065 virtual void ShutDown() { 00066 small_object_cache_->ShutDown(); 00067 large_object_cache_->ShutDown(); 00068 } 00069 00070 virtual GoogleString Name() const { 00071 return FormatName(small_object_cache_->Name(), large_object_cache_->Name()); 00072 } 00073 static GoogleString FormatName(StringPiece small, StringPiece large); 00074 00075 private: 00076 void DecodeValueMatchingKeyAndCallCallback( 00077 const GoogleString& key, const char* data, size_t data_len, 00078 Callback* callback); 00079 00080 CacheInterface* small_object_cache_; 00081 CacheInterface* large_object_cache_; 00082 int threshold_bytes_; 00083 MessageHandler* message_handler_; 00084 00085 DISALLOW_COPY_AND_ASSIGN(FallbackCache); 00086 }; 00087 00088 } 00089 00090 #endif ///< NET_INSTAWEB_UTIL_PUBLIC_FALLBACK_CACHE_H_