Page Speed Optimization Libraries
1.6.29.3
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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 00025 00026 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CACHEABLE_RESOURCE_BASE_H_ 00027 #define NET_INSTAWEB_REWRITER_PUBLIC_CACHEABLE_RESOURCE_BASE_H_ 00028 00029 #include "net/instaweb/http/public/request_context.h" 00030 #include "net/instaweb/rewriter/public/resource.h" 00031 #include "net/instaweb/rewriter/public/server_context.h" 00032 #include "net/instaweb/util/public/basictypes.h" 00033 #include "net/instaweb/util/public/string_util.h" 00034 00035 namespace net_instaweb { 00036 00037 struct ContentType; 00038 class HTTPCache; 00039 class HTTPValue; 00040 class MessageHandler; 00041 class ResponseHeaders; 00042 class RewriteDriver; 00043 class RewriteOptions; 00044 class Statistics; 00045 class Timer; 00046 class Variable; 00047 00048 class CacheableResourceBase : public Resource { 00049 public: 00051 virtual bool UseHttpCache() const { return true; } 00052 00053 virtual bool IsValidAndCacheable() const; 00054 00057 virtual void LoadAndCallback(NotCacheablePolicy not_cacheable_policy, 00058 const RequestContextPtr& request_context, 00059 AsyncCallback* callback); 00060 00062 virtual void Freshen(FreshenCallback* callback, MessageHandler* handler); 00063 00065 virtual void RefreshIfImminentlyExpiring(); 00066 00067 protected: 00069 CacheableResourceBase(StringPiece stat_prefix, RewriteDriver* rewrite_driver, 00070 const ContentType* type); 00071 virtual ~CacheableResourceBase(); 00072 00073 static void InitStats(StringPiece stat_prefix, Statistics* statistics); 00074 00076 virtual bool IsValidAndCacheableImpl( 00077 const ResponseHeaders& headers) const = 0; 00078 00079 HTTPCache* http_cache() const { return server_context()->http_cache(); } 00080 RewriteDriver* rewrite_driver() const { return rewrite_driver_; } 00081 const RewriteOptions* rewrite_options() const; 00082 00083 private: 00084 class FreshenHttpCacheCallback; 00085 class LoadHttpCacheCallback; 00086 class FetchCallbackBase; 00087 class FreshenFetchCallback; 00088 class LoadFetchCallback; 00089 friend class CacheableResourceBaseTest; 00090 00094 bool UpdateInputInfoForFreshen(const ResponseHeaders& headers, 00095 const HTTPValue& value, 00096 Resource::FreshenCallback* callback); 00097 00098 00099 Timer* timer() const { return server_context()->timer(); } 00100 MessageHandler* message_handler() const { 00101 return server_context()->message_handler(); 00102 } 00103 00104 RewriteDriver* rewrite_driver_; 00105 Variable* hits_; 00106 Variable* recent_fetch_failures_; 00107 Variable* recent_uncacheables_treated_as_miss_; 00108 Variable* recent_uncacheables_treated_as_failure_; 00109 Variable* misses_; 00110 00111 DISALLOW_COPY_AND_ASSIGN(CacheableResourceBase); 00112 }; 00113 00114 } 00115 00116 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CACHEABLE_RESOURCE_BASE_H_