1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef MEDIA_BLINK_CACHE_UTIL_H_ 6 #define MEDIA_BLINK_CACHE_UTIL_H_ 7 8 #include <stdint.h> 9 10 #include <vector> 11 12 #include "base/time/time.h" 13 #include "media/blink/media_blink_export.h" 14 15 namespace blink { 16 class WebURLResponse; 17 } 18 19 namespace media { 20 21 // Reasons that a cached WebURLResponse will *not* prevent a future request to 22 // the server. Reported via UMA, so don't change/reuse previously-existing 23 // values. 24 enum UncacheableReason { 25 kNoData = 1 << 0, // Not 200 or 206. 26 kPre11PartialResponse = 1 << 1, // 206 but HTTP version < 1.1. 27 kNoStrongValidatorOnPartialResponse = 1 << 2, // 206, no strong validator. 28 kShortMaxAge = 1 << 3, // Max age less than 1h (arbitrary value). 29 kExpiresTooSoon = 1 << 4, // Expires in less than 1h (arbitrary value). 30 kHasMustRevalidate = 1 << 5, // Response asks for revalidation. 31 kNoCache = 1 << 6, // Response included a no-cache header. 32 kNoStore = 1 << 7, // Response included a no-store header. 33 kMaxReason // Needs to be one more than max legitimate reason. 34 }; 35 36 // Return the logical OR of the reasons "response" cannot be used for a future 37 // request (using the disk cache), or 0 if it might be useful. 38 uint32_t MEDIA_BLINK_EXPORT 39 GetReasonsForUncacheability(const blink::WebURLResponse& response); 40 41 // Returns when we should evict data from this response from our 42 // memory cache. Note that we may still cache data longer if 43 // a audio/video tag is currently using it. Returns a TimeDelta 44 // which is should be added to base::Time::Now() or base::TimeTicks::Now(). 45 base::TimeDelta MEDIA_BLINK_EXPORT 46 GetCacheValidUntil(const blink::WebURLResponse& response); 47 48 } // namespace media 49 50 #endif // MEDIA_BLINK_CACHE_UTIL_H_ 51