internal VersionEntry GetVersionEntryByKey(string tableId, object recordKey, long versionKey, VersionEntry ve)
{
var rs = this.CQLExecute(string.Format(PartitionedCassandraVersionTable.CQL_GET_VERSION_ENTRY,
tableId, recordKey.ToString(), versionKey));
var rse = rs.GetEnumerator();
rse.MoveNext();
Row row = rse.Current;
if (row == null)
{
return(null);
}
if (ve == null)
{
return(new VersionEntry(versionKey, row.GetValue <long>("begintimestamp"),
row.GetValue <long>("endtimestamp"),
BytesSerializer.Deserialize(row.GetValue <byte[]>("record")),
row.GetValue <long>("txid"),
row.GetValue <long>("maxcommitts")));
}
else
{
ve.Set(
versionKey, row.GetValue <long>("begintimestamp"),
row.GetValue <long>("endtimestamp"),
BytesSerializer.Deserialize(row.GetValue <byte[]>("record")),
row.GetValue <long>("txid"),
row.GetValue <long>("maxcommitts"));
return(ve);
}
}
internal override void Visit(GetVersionListRequest req)
{
List <VersionEntry> entries = new List <VersionEntry>();
var rs = this.CQLExecute(string.Format(CassandraVersionTable.CQL_GET_VERSION_TOP_2,
req.TableId, req.RecordKey.ToString()));
foreach (var row in rs)
{
entries.Add(new VersionEntry(
row.GetValue <long>("versionkey"),
row.GetValue <long>("begintimestamp"),
row.GetValue <long>("endtimestamp"),
BytesSerializer.Deserialize(row.GetValue <byte[]>("record")),
row.GetValue <long>("txid"),
row.GetValue <long>("maxcommitts")
));
}
req.Result = entries;
req.Finished = true;
}
internal override void Visit(GetVersionListRequest req)
{
var rs = this.CQLExecute(string.Format(PartitionedCassandraVersionTable.CQL_GET_VERSION_TOP_2,
req.TableId, req.RecordKey.ToString()));
int cnt = 0;
foreach (var row in rs)
{
req.LocalContainer[cnt].Set(
row.GetValue <long>("versionkey"),
row.GetValue <long>("begintimestamp"),
row.GetValue <long>("endtimestamp"),
BytesSerializer.Deserialize(row.GetValue <byte[]>("record")),
row.GetValue <long>("txid"),
row.GetValue <long>("maxcommitts")
);
cnt += 1;
}
req.Result = cnt;
req.Finished = true;
}
/// <summary>
/// Deserialize a version entry by the given recordKey, versionKey and content bytes
/// </summary>
/// <param name="recordKey"></param>
/// <param name="versionKey"></param>
/// <param name="bytes"></param>
/// <returns></returns>
public static VersionEntry Deserialize(long versionKey, byte[] bytes, VersionEntry versionEntry = null)
{
long beginTimestamp = BitConverter.ToInt64(bytes, VersionEntry.BEGIN_TIMESTAMP_OFFSET);
long endTimestamp = BitConverter.ToInt64(bytes, VersionEntry.END_TIMESTAMP_OFFSET);
long txId = BitConverter.ToInt64(bytes, VersionEntry.TXID_OFFSET);
long maxCommitTs = BitConverter.ToInt64(bytes, VersionEntry.MAX_COMMIT_TS_OFFSET);
byte[] recordBytes = new byte[bytes.Length - VersionEntry.RECORD_OFFSET];
Buffer.BlockCopy(bytes, VersionEntry.RECORD_OFFSET, recordBytes, 0, recordBytes.Length);
object record = BytesSerializer.Deserialize(recordBytes);
if (versionEntry == null)
{
return(new VersionEntry(versionKey, beginTimestamp, endTimestamp,
record, txId, maxCommitTs));
}
else
{
versionEntry.Set(versionKey, beginTimestamp, endTimestamp,
record, txId, maxCommitTs);
return(versionEntry);
}
}