Page Speed Optimization Libraries
1.3.25.1
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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 */ 00017 00018 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_FLUSH_EARLY_CONTENT_WRITER_FILTER_H_ 00019 #define NET_INSTAWEB_REWRITER_PUBLIC_FLUSH_EARLY_CONTENT_WRITER_FILTER_H_ 00020 00021 #include <list> 00022 00023 #include "net/instaweb/htmlparse/public/html_writer_filter.h" 00024 #include "net/instaweb/http/public/logging_proto.h" 00025 #include "net/instaweb/http/public/logging_proto_impl.h" 00026 #include "net/instaweb/http/public/semantic_type.h" 00027 #include "net/instaweb/http/public/user_agent_matcher.h" 00028 #include "net/instaweb/util/public/basictypes.h" 00029 #include "net/instaweb/util/public/null_writer.h" 00030 #include "net/instaweb/util/public/scoped_ptr.h" 00031 #include "net/instaweb/util/public/string.h" 00032 #include "net/instaweb/util/public/string_util.h" 00033 00034 namespace net_instaweb { 00035 00036 class GoogleUrl; 00037 class HtmlElement; 00038 class RewriteDriver; 00039 class TimedVariable; 00040 class Writer; 00041 00042 struct ResourceInfo; 00043 00048 class FlushEarlyContentWriterFilter : public HtmlWriterFilter { 00049 public: 00050 static const char kPrefetchLinkRelSubresourceHtml[]; 00051 static const char kPrefetchImageTagHtml[]; 00052 static const char kPrefetchStartTimeScript[]; 00053 static const char kNumResourcesFlushedEarly[]; 00054 static const char kPrefetchScriptTagHtml[]; 00055 static const char kPrefetchLinkTagHtml[]; 00056 00057 explicit FlushEarlyContentWriterFilter(RewriteDriver* driver); 00058 00059 virtual void StartDocument(); 00060 virtual void EndDocument(); 00061 00062 virtual void StartElement(HtmlElement* element); 00063 virtual void EndElement(HtmlElement* element); 00064 00065 protected: 00066 virtual void Clear(); 00067 00068 private: 00070 void WriteToOriginalWriter(const GoogleString& in); 00071 00073 bool IsFlushable(const GoogleUrl& gurl, bool is_pagespeed_resource); 00074 00076 void FlushResources( 00077 StringPiece url, 00078 int64 time_to_download, 00079 bool is_pagespeed_resource, 00080 semantic_type::Category category); 00081 00082 void TryFlushingDeferJavascriptEarly(); 00083 00085 FlushEarlyResourceInfo::ResourceType GetResourceType( 00086 const GoogleUrl& gurl, bool is_pagespeed_resource); 00087 00088 RewriteDriver* driver_; 00089 TimedVariable* num_resources_flushed_early_; 00091 bool in_body_; 00092 bool insert_close_script_; 00093 int num_resources_flushed_; 00094 NullWriter null_writer_; 00095 Writer* original_writer_; 00096 HtmlElement* current_element_; 00097 UserAgentMatcher::PrefetchMechanism prefetch_mechanism_; 00098 scoped_ptr<StringSet> private_cacheable_resources_; 00099 int64 time_consumed_ms_; 00100 int64 max_available_time_ms_; 00101 typedef std::list<ResourceInfo*> ResourceInfoList; 00102 ResourceInfoList js_resources_info_; 00103 bool defer_javascript_enabled_; 00104 GoogleString flush_early_content_; 00105 00106 DISALLOW_COPY_AND_ASSIGN(FlushEarlyContentWriterFilter); 00107 }; 00108 00109 } 00110 00111 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_FLUSH_EARLY_CONTENT_WRITER_FILTER_H_