public ReplLogFetcher(ReplHandler local_db, string log_server_guid)
{
this.local_db = local_db;
this.log_server_guid = log_server_guid;
our_fetcher = new Thread(delegate() {
this.workerThread();
});
our_fetcher.Start();
}
public static void waitUntilState(LayerManager db, ReplHandler srvr, ReplState state)
{
for (int x = 0; x < 20; x++) {
if (srvr.State == state) {
break;
}
Console.WriteLine("waiting for ({0}) to become {1}.. (currently: {2})",
srvr.ToString(),state, srvr.State);
Thread.Sleep(1000);
}
if (srvr.State != state) {
db.debugDump();
Console.WriteLine("server({0}) failed to become {1}, aborting test",
srvr.ToString(), state);
Environment.Exit(1);
}
Console.WriteLine("Server ({0}) is now {1}!", srvr, state);
}
public ReplPusher(ReplHandler handler)
{
servers = new HashSet<string>();
myhandler = handler;
}
public static ReplHandler InitResume(IStepsSnapshotKVDB db, ServerContext ctx)
{
ReplHandler repl = new ReplHandler(db, ctx);
return repl;
}
public static ReplHandler InitJoin(IStepsSnapshotKVDB db, ServerContext ctx, string seed_name)
{
// connect to the other server, get his instance id, exchange seeds
IReplConnection seed = ctx.connector.getServerHandle(seed_name);
JoinInfo join_info = seed.requestToJoin(ctx.server_guid);
// record the join result
db.setValue(new RecordKey()
.appendKeyPart("_config")
.appendKeyPart("DATA-INSTANCE-ID"),
RecordUpdate.WithPayload(join_info.data_instance_id));
// init a clean log
db.setValue(new RecordKey()
.appendKeyPart("_logs")
.appendKeyPart(ctx.server_guid)
.appendKeyPart(new RecordKeyType_Long(0)),
RecordUpdate.WithPayload(new byte[0]));
foreach (var seed_server in join_info.seed_servers) {
db.setValue(new RecordKey()
.appendKeyPart("_config")
.appendKeyPart("seeds")
.appendKeyPart(seed_server),
RecordUpdate.WithPayload(""));
}
Console.WriteLine("InitJoin: server ({0}) joining seeds ({1})",
ctx.server_guid, String.Join(",", join_info.seed_servers));
ReplHandler repl = new ReplHandler(db, ctx);
return repl;
}
public static ReplHandler InitFresh(IStepsSnapshotKVDB db, ServerContext ctx)
{
// init fresh
// record our instance ID
db.setValue(new RecordKey()
.appendKeyPart("_config")
.appendKeyPart("MY-SERVER-ID"),
RecordUpdate.WithPayload(ctx.server_guid));
// create and record a new instance ID
db.setValue(new RecordKey()
.appendKeyPart("_config")
.appendKeyPart("DATA-INSTANCE-ID"),
RecordUpdate.WithPayload(Lsd.numberToLsd(ReplHandler.myrnd.Next(), 15)));
// record the "start of fresh log" record
db.setValue(new RecordKey()
.appendKeyPart("_logs")
.appendKeyPart(ctx.server_guid)
.appendKeyPart(new RecordKeyType_Long(0)),
RecordUpdate.WithPayload(new byte[0]));
// record ourself as a seed/log
db.setValue(new RecordKey()
.appendKeyPart("_config").appendKeyPart("seeds").appendKeyPart(ctx.server_guid),
RecordUpdate.WithPayload(""));
ReplHandler repl = new ReplHandler(db, ctx);
repl.state = ReplState.active; // TODO: is this the right way to become active?
return repl;
}
internal MyReplConnection(ReplHandler hndl)
{
this.hndl = hndl;
}
public static void waitUntilActive(LayerManager db, ReplHandler srvr)
{
waitUntilState(db, srvr, ReplState.active);
}