public PutResult Put(PutRequest request)
{
var hash = GetSha256Hash(request);
var versions = GatherActiveVersions(request.Key);
if (versions.Length == 1)
{
// Test that the key doesn't already exist with matching value
var values = Get(new GetRequest {
Key = request.Key, SpecifiedVersion = versions[0]
});
if (values.Length == 1 && values[0].Sha256Hash.SequenceEqual(hash))
{
return(new PutResult
{
ConflictExists = false,
Version = versions[0]
});
}
}
// we always accept read only put requests, because
// we assume that there can never be a conflict with them
// since they are read only values.
var doesAllVersionsMatch =
request.IsReadOnly
?
request.IsReadOnly
:
DoesAllVersionsMatch(request.Key, request.ParentVersions);
if (doesAllVersionsMatch == false &&
request.OptimisticConcurrency)
{
return(new PutResult
{
ConflictExists = true,
Version = null
});
}
// always remove the active versions from the cache
commitSyncronization.Add(() => cache.Remove(GetKey(request.Key)));
if (doesAllVersionsMatch)
{
// we only remove existing versions from the
// cache if we delete them from the database
foreach (var parentVersion in versions)
{
var copy = parentVersion;
commitSyncronization.Add(() => cache.Remove(GetKey(request.Key, copy)));
}
DeleteAllKeyValuesForVersions(request.Key, versions);
}
var instanceIdForRow = instanceId;
if (request.ReplicationVersion != null)
{
instanceIdForRow = request.ReplicationVersion.InstanceId;
}
var versionNumber = request.ReplicationVersion == null
? versionGenerator.GenerateNextVersion()
: request.ReplicationVersion.Number;
using (var update = new Update(session, keys, JET_prep.Insert))
{
Api.SetColumn(session, keys, keysColumns["key"], request.Key, Encoding.Unicode);
Api.SetColumn(session, keys, keysColumns["version_instance_id"], instanceIdForRow.ToByteArray());
Api.SetColumn(session, keys, keysColumns["version_number"], versionNumber);
if (request.Tag.HasValue)
{
Api.SetColumn(session, keys, keysColumns["tag"], request.Tag.Value);
}
if (request.ExpiresAt.HasValue)
{
Api.SetColumn(session, keys, keysColumns["expiresAt"], request.ExpiresAt.Value.ToOADate());
}
update.Save();
}
using (var update = new Update(session, data, JET_prep.Insert))
{
Api.SetColumn(session, data, dataColumns["key"], request.Key, Encoding.Unicode);
Api.SetColumn(session, data, dataColumns["version_number"], versionNumber);
Api.SetColumn(session, data, dataColumns["version_instance_id"], instanceIdForRow.ToByteArray());
Api.SetColumn(session, data, dataColumns["data"], request.Bytes);
Api.SetColumn(session, data, dataColumns["sha256_hash"], hash);
Api.SetColumn(session, data, dataColumns["readonly"], request.IsReadOnly);
var timestamp = DateTime.Now.ToOADate();
if (request.Tag.HasValue)
{
Api.SetColumn(session, data, dataColumns["tag"], request.Tag.Value);
}
if (request.ReplicationTimeStamp.HasValue)
{
timestamp = request.ReplicationTimeStamp.Value.ToOADate();
}
Api.SetColumn(session, data, dataColumns["timestamp"], timestamp);
if (request.ExpiresAt.HasValue)
{
Api.SetColumn(session, data, dataColumns["expiresAt"], request.ExpiresAt.Value.ToOADate());
}
WriteAllParentVersions(request.ParentVersions, data, dataColumns);
update.Save();
}
return(new PutResult
{
ConflictExists = doesAllVersionsMatch == false,
Version = new ValueVersion
{
InstanceId = instanceIdForRow,
Number = versionNumber
}
});
}
public void IncrementVersion()
{
VersionKey = VersionGenerator.ConvertKeyToString(VersionGenerator.GenerateNextVersion(VersionGenerator.GetKeyFromString(VersionKey)));
IsChanged = false;
}