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| 1 /* |
| 2 * Copyright 2016 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef SkUrlDataManager_DEFINED |
| 9 #define SkUrlDataManager_DEFINED |
| 10 |
| 11 #include "SkChecksum.h" |
| 12 #include "SkData.h" |
| 13 #include "SkString.h" |
| 14 #include "SkTDynamicHash.h" |
| 15 |
| 16 /* |
| 17 * A simple class which allows clients to add opaque data types, and returns a u
rl where this data |
| 18 * will be hosted. Its up to the owner of this class to actually serve the data
. |
| 19 */ |
| 20 bool operator==(const SkData& a, const SkData& b); |
| 21 |
| 22 class UrlDataManager { |
| 23 public: |
| 24 UrlDataManager(SkString rootUrl); |
| 25 ~UrlDataManager() { this->reset(); } |
| 26 |
| 27 /* |
| 28 * Adds a data blob to the cache with a particular content type. UrlDataMan
ager will hash |
| 29 * the blob data to ensure uniqueness |
| 30 */ |
| 31 SkString addData(SkData*, const char* contentType); |
| 32 |
| 33 struct UrlData : public SkRefCnt { |
| 34 SkString fUrl; |
| 35 SkString fContentType; |
| 36 SkAutoTUnref<SkData> fData; |
| 37 }; |
| 38 |
| 39 /* |
| 40 * returns the UrlData object which should be hosted at 'url' |
| 41 */ |
| 42 UrlData* getDataFromUrl(SkString url) { |
| 43 return fUrlLookup.find(url); |
| 44 } |
| 45 void reset(); |
| 46 |
| 47 private: |
| 48 struct LookupTrait { |
| 49 // We use the data as a hash, this is not really optimal but is fine unt
il proven otherwise |
| 50 static const SkData& GetKey(const UrlData& data) { |
| 51 return *data.fData.get(); |
| 52 } |
| 53 |
| 54 static uint32_t Hash(const SkData& key) { |
| 55 return SkChecksum::Murmur3(key.bytes(), key.size()); |
| 56 } |
| 57 }; |
| 58 |
| 59 struct ReverseLookupTrait { |
| 60 static const SkString& GetKey(const UrlData& data) { |
| 61 return data.fUrl; |
| 62 } |
| 63 |
| 64 static uint32_t Hash(const SkString& key) { |
| 65 return SkChecksum::Murmur3(key.c_str(), strlen(key.c_str())); |
| 66 } |
| 67 }; |
| 68 |
| 69 |
| 70 SkString fRootUrl; |
| 71 SkTDynamicHash<UrlData, SkData, LookupTrait> fCache; |
| 72 SkTDynamicHash<UrlData, SkString, ReverseLookupTrait> fUrlLookup; |
| 73 uint32_t fDataId; |
| 74 }; |
| 75 |
| 76 #endif |
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