Page Speed Optimization Libraries  1.8.31.3
net/instaweb/rewriter/public/experiment_util.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 
00023 
00024 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_EXPERIMENT_UTIL_H_
00025 #define NET_INSTAWEB_REWRITER_PUBLIC_EXPERIMENT_UTIL_H_
00026 
00027 #include "net/instaweb/util/public/basictypes.h"
00028 #include "net/instaweb/util/public/string.h"
00029 #include "net/instaweb/util/public/string_util.h"
00030 
00031 namespace net_instaweb {
00032 
00033 class RequestHeaders;
00034 class ResponseHeaders;
00035 class RewriteOptions;
00036 
00037 namespace experiment {
00038 
00039 enum ExperimentState {
00048   kForceNoExperiment = -2,
00051   kExperimentNotSet = -1,
00055   kNoExperiment = 0,
00056 };
00057 
00059 const char kExperimentCookie[] = "PageSpeedExperiment";
00060 const char kExperimentCookiePrefix[] = "PageSpeedExperiment=";
00061 
00064 bool GetExperimentCookieState(const RequestHeaders& headers, int* value);
00065 
00068 void RemoveExperimentCookie(RequestHeaders *headers);
00069 
00073 void SetExperimentCookie(ResponseHeaders* headers, int state,
00074                          const StringPiece& url, int64 expiration_time_ms);
00075 
00077 int DetermineExperimentState(const RewriteOptions* options);
00078 
00080 bool AnyActiveExperiments(const RewriteOptions* options);
00081 
00084 GoogleString ExperimentStateToCookieString(int state);
00085 
00087 int CookieStringToState(const StringPiece& cookie_str);
00088 
00089 }  
00090 
00091 }  
00092 
00093 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_EXPERIMENT_UTIL_H_
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