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 CONTENT_CHILD_INDEXED_DB_WEBIDBCURSOR_IMPL_H_ 6 #define CONTENT_CHILD_INDEXED_DB_WEBIDBCURSOR_IMPL_H_ 7 8 #include <deque> 9 #include <vector> 10 11 #include "base/basictypes.h" 12 #include "base/compiler_specific.h" 13 #include "base/gtest_prod_util.h" 14 #include "base/memory/ref_counted.h" 15 #include "content/common/content_export.h" 16 #include "content/common/indexed_db/indexed_db_key.h" 17 #include "third_party/WebKit/public/platform/WebData.h" 18 #include "third_party/WebKit/public/platform/WebIDBCallbacks.h" 19 #include "third_party/WebKit/public/platform/WebIDBCursor.h" 20 #include "third_party/WebKit/public/platform/WebIDBKey.h" 21 22 namespace content { 23 class ThreadSafeSender; 24 25 class CONTENT_EXPORT WebIDBCursorImpl NON_EXPORTED_BASE(public blink::WebIDBCursor)26 : NON_EXPORTED_BASE(public blink::WebIDBCursor) { 27 public: 28 WebIDBCursorImpl(int32 ipc_cursor_id, 29 int64 transaction_id, 30 ThreadSafeSender* thread_safe_sender); 31 virtual ~WebIDBCursorImpl(); 32 33 virtual void advance(unsigned long count, blink::WebIDBCallbacks* callback); 34 virtual void continueFunction(const blink::WebIDBKey& key, 35 blink::WebIDBCallbacks* callback); 36 virtual void continueFunction(const blink::WebIDBKey& key, 37 const blink::WebIDBKey& primary_key, 38 blink::WebIDBCallbacks* callback); 39 virtual void postSuccessHandlerCallback(); 40 41 void SetPrefetchData( 42 const std::vector<IndexedDBKey>& keys, 43 const std::vector<IndexedDBKey>& primary_keys, 44 const std::vector<blink::WebData>& values, 45 const std::vector<blink::WebVector<blink::WebBlobInfo> >& blob_info); 46 47 void CachedAdvance(unsigned long count, blink::WebIDBCallbacks* callbacks); 48 void CachedContinue(blink::WebIDBCallbacks* callbacks); 49 50 // This method is virtual so it can be overridden in unit tests. 51 virtual void ResetPrefetchCache(); 52 53 int64 transaction_id() const { return transaction_id_; } 54 55 private: 56 FRIEND_TEST_ALL_PREFIXES(IndexedDBDispatcherTest, CursorReset); 57 FRIEND_TEST_ALL_PREFIXES(IndexedDBDispatcherTest, CursorTransactionId); 58 FRIEND_TEST_ALL_PREFIXES(WebIDBCursorImplTest, AdvancePrefetchTest); 59 FRIEND_TEST_ALL_PREFIXES(WebIDBCursorImplTest, PrefetchReset); 60 FRIEND_TEST_ALL_PREFIXES(WebIDBCursorImplTest, PrefetchTest); 61 62 int32 ipc_cursor_id_; 63 int64 transaction_id_; 64 65 // Prefetch cache. 66 std::deque<IndexedDBKey> prefetch_keys_; 67 std::deque<IndexedDBKey> prefetch_primary_keys_; 68 std::deque<blink::WebData> prefetch_values_; 69 std::deque<blink::WebVector<blink::WebBlobInfo> > prefetch_blob_info_; 70 71 // Number of continue calls that would qualify for a pre-fetch. 72 int continue_count_; 73 74 // Number of items used from the last prefetch. 75 int used_prefetches_; 76 77 // Number of onsuccess handlers we are waiting for. 78 int pending_onsuccess_callbacks_; 79 80 // Number of items to request in next prefetch. 81 int prefetch_amount_; 82 83 scoped_refptr<ThreadSafeSender> thread_safe_sender_; 84 85 enum { kInvalidCursorId = -1 }; 86 enum { kPrefetchContinueThreshold = 2 }; 87 enum { kMinPrefetchAmount = 5 }; 88 enum { kMaxPrefetchAmount = 100 }; 89 }; 90 91 } // namespace content 92 93 #endif // CONTENT_CHILD_INDEXED_DB_WEBIDBCURSOR_IMPL_H_ 94