Page Speed Optimization Libraries
1.5.27.2
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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_REWRITER_PUBLIC_CACHE_EXTENDER_H_ 00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CACHE_EXTENDER_H_ 00021 00022 #include "net/instaweb/rewriter/public/resource.h" 00023 #include "net/instaweb/rewriter/public/server_context.h" 00024 #include "net/instaweb/rewriter/public/resource_slot.h" 00025 #include "net/instaweb/rewriter/public/rewrite_filter.h" 00026 #include "net/instaweb/rewriter/public/rewrite_options.h" 00027 #include "net/instaweb/rewriter/public/rewrite_result.h" 00028 #include "net/instaweb/util/public/basictypes.h" 00029 #include "net/instaweb/util/public/string_util.h" 00030 00031 namespace net_instaweb { 00032 00033 class HtmlElement; 00034 class ResponseHeaders; 00035 class RewriteContext; 00036 class RewriteDriver; 00037 class Statistics; 00038 class Variable; 00039 00048 class CacheExtender : public RewriteFilter { 00049 public: 00050 static const char kCacheExtensions[]; 00051 static const char kNotCacheable[]; 00052 00053 explicit CacheExtender(RewriteDriver* driver); 00054 virtual ~CacheExtender(); 00055 00056 static void InitStats(Statistics* statistics); 00057 00058 virtual void StartDocumentImpl() {} 00059 virtual void StartElementImpl(HtmlElement* element); 00060 virtual void EndElementImpl(HtmlElement* element) {} 00061 00062 virtual const char* Name() const { return "CacheExtender"; } 00063 virtual const char* id() const { return RewriteOptions::kCacheExtenderId; } 00064 00067 RewriteContext* MakeNestedContext(RewriteContext* parent, 00068 const ResourceSlotPtr& slot); 00069 00070 protected: 00071 virtual bool ComputeOnTheFly() const; 00072 virtual RewriteContext* MakeRewriteContext(); 00073 00074 private: 00075 class Context; 00076 friend class Context; 00077 00078 RewriteResult RewriteLoadedResource(const ResourcePtr& input_resource, 00079 const OutputResourcePtr& output_resource); 00080 00081 bool ShouldRewriteResource( 00082 const ResponseHeaders* headers, int64 now_ms, 00083 const ResourcePtr& input_resource, const StringPiece& url) const; 00084 00085 Variable* extension_count_; 00086 Variable* not_cacheable_count_; 00087 00088 DISALLOW_COPY_AND_ASSIGN(CacheExtender); 00089 }; 00090 00091 } 00092 00093 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CACHE_EXTENDER_H_