public void ExpireOfExpiredRecordProduceWriteConflict()
{
var memoryManager = new MemoryManager();
var content = new byte[] { 0, 1 };
var recordReference = VersionedRecord.CreateNew(content, 0, memoryManager);
var snapshotData = new SnapshotData(new int[] { });
var record = new VersionedRecord(memoryManager.Get(recordReference).RawData, memoryManager, snapshotData);
record.Expire(0); // zero transaction expires the record
Assert.That(() => record.Expire(1), Throws.Exception.TypeOf <WriteConflictException>()); // first transaction trying to expire it
}
public void ExpiredVersionIsInvisible()
{
var memoryManager = new MemoryManager();
var content = new byte[] { 0, 1 };
var recordReference = VersionedRecord.CreateNew(content, 0, memoryManager);
var snapshotData = new SnapshotData(new int[] { });
var record = new VersionedRecord(memoryManager.Get(recordReference).RawData, memoryManager, snapshotData);
record.Expire(0);
Assert.IsFalse(record.HasVisibleVersionTo(0));
}
public void UpdateRecordExpiredByRolledBackTransaction()
{
var memoryManager = new MemoryManager();
var content = new byte[] { 0, 1 };
var newContent = new byte[] { 2, 3 };
var recordReference = VersionedRecord.CreateNew(content, 0, memoryManager);
var snapshotData = new SnapshotData(new[] { 0 });
var record = new VersionedRecord(memoryManager.Get(recordReference).RawData, memoryManager, snapshotData);
var newReference = record.Expire(1);
snapshotData = new SnapshotData(new[] { 0 }, new[] { 1 });
record = new VersionedRecord(memoryManager.Get(newReference).RawData, memoryManager, snapshotData);
record.Update(newContent, 2);
Assert.IsTrue(newContent.SequenceEqual(record.GetMatchingVersion(2).RawData));
}
public void ResurrectRecordExpiredByCommitedTransaction()
{
var memoryManager = new MemoryManager();
var content = new byte[] { 0, 1 };
var newContent = new byte[] { 2, 3 };
var recordReference = VersionedRecord.CreateNew(content, 0, memoryManager);
var snapshotData = new SnapshotData(new int[] { });
var record = new VersionedRecord(memoryManager.Get(recordReference).RawData, memoryManager, snapshotData);
var newReference = record.Expire(0);
snapshotData = new SnapshotData(new[] { 0 });
record = new VersionedRecord(memoryManager.Get(newReference).RawData, memoryManager, snapshotData);
record.Insert(newContent, 1);
Assert.IsTrue(newContent.SequenceEqual(record.GetMatchingVersion(1).RawData));
}