Page Speed Optimization Libraries  1.7.30.2
net/instaweb/automatic/public/flush_early_flow.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  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_AUTOMATIC_PUBLIC_FLUSH_EARLY_FLOW_H_
00020 #define NET_INSTAWEB_AUTOMATIC_PUBLIC_FLUSH_EARLY_FLOW_H_
00021 
00022 #include "net/instaweb/util/public/basictypes.h"
00023 #include "net/instaweb/util/public/string.h"
00024 #include "net/instaweb/util/public/string_util.h"
00025 #include "net/instaweb/util/public/string_writer.h"
00026 
00027 namespace net_instaweb {
00028 
00029 class AsyncFetch;
00030 class FlushEarlyInfo;
00031 class Histogram;
00032 class MessageHandler;
00033 class ProxyFetchPropertyCallbackCollector;
00034 class ProxyFetchFactory;
00035 class ServerContext;
00036 class RewriteDriver;
00037 class Statistics;
00038 class TimedVariable;
00039 
00045 class FlushEarlyFlow {
00046  public:
00047   static const char kNumRequestsFlushedEarly[];
00048   static const char kNumResourcesFlushedEarly[];
00049   static const char kFlushEarlyRewriteLatencyMs[];
00050   static const char kNumFlushEarlyHttpStatusCodeDeemedUnstable[];
00051   static const char kNumFlushEarlyRequestsRedirected[];
00052   static const char kRedirectPageJs[];
00053 
00054   static void TryStart(
00055       const GoogleString& url,
00056       AsyncFetch** base_fetch,
00057       RewriteDriver* driver,
00058       ProxyFetchFactory* factory,
00059       ProxyFetchPropertyCallbackCollector* property_callback);
00060 
00061   static void InitStats(Statistics* stats);
00062 
00063   virtual ~FlushEarlyFlow();
00064 
00065  private:
00066   class FlushEarlyAsyncFetch;
00069   void FlushEarly();
00070 
00072   void Cancel();
00073 
00074   FlushEarlyFlow(const GoogleString& url,
00075                  AsyncFetch* base_fetch,
00076                  FlushEarlyAsyncFetch* flush_early_fetch,
00077                  RewriteDriver* driver,
00078                  ProxyFetchFactory* factory,
00079                  ProxyFetchPropertyCallbackCollector* property_cache_callback);
00080 
00082   void GenerateResponseHeaders(const FlushEarlyInfo& flush_early_info);
00083 
00087   void FlushEarlyRewriteDone(int64 start_time_ms,
00088                              RewriteDriver* flush_early_driver);
00089 
00090   void Write(const StringPiece& val);
00091 
00092   GoogleString url_;
00093   GoogleString dummy_head_;
00094   StringWriter dummy_head_writer_;
00095   int num_resources_flushed_;
00096   int num_rewritten_resources_;
00097   int64 average_fetch_time_;
00098 
00099   AsyncFetch* base_fetch_;
00100   FlushEarlyAsyncFetch* flush_early_fetch_;
00101   RewriteDriver* driver_;
00102   ProxyFetchFactory* factory_;
00103   ServerContext* server_context_;
00104   ProxyFetchPropertyCallbackCollector* property_cache_callback_;
00105   bool should_flush_early_lazyload_script_;
00106   MessageHandler* handler_;
00107   bool is_mobile_user_agent_;
00108 
00109   TimedVariable* num_requests_flushed_early_;
00110   TimedVariable* num_resources_flushed_early_;
00111   TimedVariable* num_flush_early_http_status_code_deemed_unstable_;
00112   Histogram* flush_early_rewrite_latency_ms_;
00113 
00114   DISALLOW_COPY_AND_ASSIGN(FlushEarlyFlow);
00115 };
00116 
00117 }  
00118 
00119 #endif  ///< NET_INSTAWEB_AUTOMATIC_PUBLIC_FLUSH_EARLY_FLOW_H_
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