From 46313049ac01a3007ef60bdc937442945355a38d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?R=C3=A9mi=20Nicole?= Date: Wed, 22 Aug 2018 14:16:59 +0200 Subject: Separate UIDs and Revisions in main databases Summary: - Change revision type from `qint64` to `size_t` for LMDB in a couple of places (LMDB supports `unsigned int` or `size_t` which are `long unsigned int` on my machine) - Better support for database flags (duplicate, integer keys, integer values for now but is extensible) - Main databases' keys are now revisions - Some databases switched to integer keys databases: - Main databases - the revision to uid mapping database - the revision to entity type mapping database - Refactor the entity type's `typeDatabases` method (if in the future we need to change the main databases' flags again) - New uid to revision mapping database (`uidsToRevisions`): - Stores all revisions (not uid to latest revision) because we need it for cleaning old revisions - Flags are: duplicates + integer values (so findLatest finds the latest revision for the given uid) ~~Problems to fix before merging:~~ All Fixed! - ~~Sometimes Sink can't read what has just been written to the database (maybe because of transactions race conditions)~~ - ~~Most of the times, this results in Sink not able to find the uid for a given revision by reading the `revisions` database~~ - ~~`pipelinetest`'s `testModifyWithConflict` fails because the local changes are overridden~~ ~~The first problem prevents me from running benchmarks~~ Reviewers: cmollekopf Tags: #sink Differential Revision: https://phabricator.kde.org/D14974 --- common/utils.cpp | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'common/utils.cpp') diff --git a/common/utils.cpp b/common/utils.cpp index 3c54db4..f6c6798 100644 --- a/common/utils.cpp +++ b/common/utils.cpp @@ -23,3 +23,13 @@ QByteArray Sink::createUuid() { return QUuid::createUuid().toByteArray(); } + +const QByteArray Sink::sizeTToByteArray(const size_t &value) +{ + return QByteArray::fromRawData(reinterpret_cast(&value), sizeof(size_t)); +} + +size_t Sink::byteArrayToSizeT(const QByteArray &value) +{ + return *reinterpret_cast(value.constData()); +} -- cgit v1.2.3