Page Speed Optimization Libraries  1.2.24.1
net/instaweb/rewriter/public/flush_early_content_writer_filter.h
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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/semantic_type.h"
00025 #include "net/instaweb/http/public/user_agent_matcher.h"
00026 #include "net/instaweb/util/public/basictypes.h"
00027 #include "net/instaweb/util/public/null_writer.h"
00028 #include "net/instaweb/util/public/scoped_ptr.h"
00029 #include "net/instaweb/util/public/string.h"
00030 #include "net/instaweb/util/public/string_util.h"
00031 
00032 namespace net_instaweb {
00033 
00034 class GoogleUrl;
00035 class HtmlElement;
00036 class RewriteDriver;
00037 class TimedVariable;
00038 class Writer;
00039 
00040 struct ResourceInfo;
00041 
00046 class FlushEarlyContentWriterFilter : public HtmlWriterFilter {
00047  public:
00048   static const char kPrefetchLinkRelSubresourceHtml[];
00049   static const char kPrefetchImageTagHtml[];
00050   static const char kPrefetchStartTimeScript[];
00051   static const char kNumResourcesFlushedEarly[];
00052   static const char kPrefetchScriptTagHtml[];
00053   static const char kPrefetchLinkTagHtml[];
00054 
00055   explicit FlushEarlyContentWriterFilter(RewriteDriver* driver);
00056 
00057   virtual void StartDocument();
00058   virtual void EndDocument();
00059 
00060   virtual void StartElement(HtmlElement* element);
00061   virtual void EndElement(HtmlElement* element);
00062 
00063  protected:
00064   virtual void Clear();
00065 
00066  private:
00068   void WriteToOriginalWriter(const GoogleString& in);
00069 
00071   bool IsFlushable(const GoogleUrl& gurl, bool is_pagespeed_resource);
00072 
00074   void FlushResources(
00075       StringPiece url,
00076       int64 time_to_download,
00077       bool is_pagespeed_resource,
00078       semantic_type::Category category);
00079 
00080   RewriteDriver* driver_;
00081   TimedVariable* num_resources_flushed_early_;
00083   bool in_body_;
00084   bool insert_close_script_;
00085   int num_resources_flushed_;
00086   NullWriter null_writer_;
00087   Writer* original_writer_;
00088   HtmlElement* current_element_;
00089   UserAgentMatcher::PrefetchMechanism prefetch_mechanism_;
00090   scoped_ptr<StringSet> private_cacheable_resources_;
00091   int64 time_consumed_ms_;
00092   int64 max_available_time_ms_;
00093   typedef std::list<ResourceInfo*> ResourceInfoList;
00094   ResourceInfoList js_resources_info_;
00095   bool defer_javascript_enabled_;
00096   GoogleString flush_early_content_;
00097 
00098   DISALLOW_COPY_AND_ASSIGN(FlushEarlyContentWriterFilter);
00099 };
00100 
00101 }  
00102 
00103 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_FLUSH_EARLY_CONTENT_WRITER_FILTER_H_
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