IndexedDB 2.0: Prefetch cursor records in the server.
https://bugs.webkit.org/show_bug.cgi?id=166014
Reviewed by Andy Estes.
No new tests (Covered by existing LayoutTests and PerformanceTests).
This patch implements the followng:
1 - After a backing store cursor completes a fetch in the server, it will schedule the next fetch
even before the client requests one. It will do this up to a limited number of prefetches.
2 - Once a client request to advance the cursor comes in, we'll work our way through prefetched
records instead of reading anything from disk, which might then cause us to continue prefetch.
3 - If any changes to the object store occur, it will throw away all previously fetched records
(There's room for future improvement here)
* Modules/indexeddb/server/IDBBackingStore.h:
* Modules/indexeddb/server/IDBServer.cpp:
(WebCore::IDBServer::IDBServer::postDatabaseTask):
* Modules/indexeddb/server/MemoryIDBBackingStore.h:
* Modules/indexeddb/server/SQLiteIDBBackingStore.cpp:
(WebCore::IDBServer::SQLiteIDBBackingStore::deleteRange):
(WebCore::IDBServer::SQLiteIDBBackingStore::prefetchCursor):
* Modules/indexeddb/server/SQLiteIDBBackingStore.h:
* Modules/indexeddb/server/SQLiteIDBCursor.cpp:
(WebCore::IDBServer::SQLiteIDBCursor::objectStoreRecordsChanged):
(WebCore::IDBServer::SQLiteIDBCursor::prefetch):
(WebCore::IDBServer::SQLiteIDBCursor::advance):
* Modules/indexeddb/server/SQLiteIDBCursor.h:
* Modules/indexeddb/server/UniqueIDBDatabase.cpp:
(WebCore::IDBServer::UniqueIDBDatabase::performIterateCursor):
(WebCore::IDBServer::UniqueIDBDatabase::performPrefetchCursor):
(WebCore::IDBServer::UniqueIDBDatabase::postDatabaseTask):
* Modules/indexeddb/server/UniqueIDBDatabase.h:
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@209977 268f45cc-cd09-0410-ab3c-d52691b4dbfc
10 files changed
