|
public sortedWalk ( ) : RecordUpdate>>.IEnumerable |
||
| Результат | RecordUpdate>>.IEnumerable | |
public void handleCommand(LogCommands cmd, byte[] cmddata)
{
if (cmd == LogCommands.UPDATE) {
// decode basic block key/value writes
BlockAccessor ba = new BlockAccessor(cmddata);
ISegmentBlockDecoder decoder = new SegmentBlockBasicDecoder(ba);
foreach (KeyValuePair<RecordKey, RecordUpdate> kvp in decoder.sortedWalk()) {
// add the updates to our working segment...
lock (mylayer.segmentlayers) {
#if false
// some status debug code...
if (RangemapManager.RangeKey.isRangeKey(kvp.Key)) {
System.Console.WriteLine("LayerManager.handleCommand : setValue() {0} => {1}",
kvp.Key.ToString(), kvp.Value.ToString());
if (kvp.Value.type != RecordUpdateTypes.DELETION_TOMBSTONE && kvp.Value.data.Length != 16) {
throw new Exception("!!! corrupted rangekey appeared in handleCommand");
}
}
#endif
mylayer.workingSegment.setRecord(kvp.Key, kvp.Value);
}
}
} else if (cmd == LogCommands.CHECKPOINT_START) {
// here we move aside the checkpoint segment...
// - if this is during live operation, the checkpoint is running as soon as we return.
// - if this is during recovery, there is no checkpoint running and we'll need to
// TODO: we need some kind of key/checksum to be sure that we CHECKPOINT and DROP the right dataF
checkpointSegment = mylayer.workingSegment;
SegmentMemoryBuilder newsegment = new SegmentMemoryBuilder();
lock (mylayer.segmentlayers) {
mylayer.workingSegment = newsegment;
mylayer.segmentlayers.Insert(0, mylayer.workingSegment);
}
} else if (cmd == LogCommands.CHECKPOINT_DROP) {
// TODO: we need some kind of key/checksum to be sure that we CHECKPOINT and DROP the right data
if (checkpointSegment != null) {
lock (mylayer.segmentlayers) {
mylayer.segmentlayers.Remove(checkpointSegment);
checkpointSegment = null;
}
} else {
throw new Exception("can't drop, no segment to drop");
}
} else {
throw new Exception("unimplemented command");
}
}
public static void T01_BlockEncodeDecodeTest()
{
MemoryStream ms = new MemoryStream();
byte[] testdata = { 0x00, 0x10, 0x78, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x80, 0x01, 0x00, 0x00, 0x00, 0x00 };
// init an encoder and add one key which requires escaping
{
ISegmentBlockEncoder enc = new SegmentBlockBasicEncoder();
enc.setStream(ms);
RecordKey key = new RecordKey().appendParsedKey("TESTSETEST");
RecordUpdate update = RecordUpdate.WithPayload(testdata);
enc.add(key, update);
enc.flush();
ms.Flush();
System.Console.WriteLine("Test Update: " + update.ToString());
}
byte[] block_contents = ms.ToArray();
System.Console.WriteLine("Block Output: " + BitConverter.ToString(block_contents));
// init the decoder
{
ISegmentBlockDecoder dec = new SegmentBlockBasicDecoder(new BlockAccessor(ms.ToArray()));
foreach (var kvp in dec.sortedWalk()) {
System.Console.WriteLine("Payload Update: " + kvp.Value.ToString());
byte[] payload = kvp.Value.data;
Assert.AreEqual(testdata, payload, "payload data mismatch!");
}
}
}
internal void applyLogEntry(string from_server_guid, long logstamp, RecordUpdate logdata)
{
// (0) unpack the data
BlockAccessor ba = new BlockAccessor(logdata.data);
ISegmentBlockDecoder decoder = new SegmentBlockBasicDecoder(ba);
// (1) add it to our copy of that server's log
this._recordLogEntry(from_server_guid, logstamp, logdata);
// (2) add it to the database
foreach (var kvp in decoder.sortedWalk()) {
RecordKey local_data_key = new RecordKey()
.appendKeyPart("_data");
foreach (var part in kvp.Key.key_parts) {
local_data_key.appendKeyPart(part);
}
next_stage.setValue(local_data_key, kvp.Value);
}
}