Page Speed Optimization Libraries
1.4.26.1
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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 00028 namespace net_instaweb { 00029 00030 class MessageHandler; 00031 class SharedString; 00032 00038 class FallbackCache : public CacheInterface { 00039 public: 00043 FallbackCache(CacheInterface* small_object_cache, 00044 CacheInterface* large_object_cache, 00045 int threshold_bytes, 00046 MessageHandler* handler); 00047 virtual ~FallbackCache(); 00048 00049 virtual void Get(const GoogleString& key, Callback* callback); 00050 virtual void Put(const GoogleString& key, SharedString* value); 00051 virtual void Delete(const GoogleString& key); 00052 virtual void MultiGet(MultiGetRequest* request); 00053 virtual const char* Name() const { return name_.c_str(); } 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 private: 00071 void DecodeValueMatchingKeyAndCallCallback( 00072 const GoogleString& key, const char* data, size_t data_len, 00073 Callback* callback); 00074 00075 CacheInterface* small_object_cache_; 00076 CacheInterface* large_object_cache_; 00077 int threshold_bytes_; 00078 MessageHandler* message_handler_; 00079 GoogleString name_; 00080 00081 DISALLOW_COPY_AND_ASSIGN(FallbackCache); 00082 }; 00083 00084 } 00085 00086 #endif ///< NET_INSTAWEB_UTIL_PUBLIC_FALLBACK_CACHE_H_