public void registerOperation(MetaDataServer md, MetaDataOperation operation)
{
Console.WriteLine("registerOperation: " + operation + (operation == null ? "NULL" : "" + operation.OperationId));
if (md == null || operation == null)
{
throw new ArgumentNullException("RegisterOperation - Expected a MDS and an operation [ MDS:" + md + ", Operation: " + operation + " ]");
}
int operationId;
lock (typeof(MetaDataLog))
{
operationId = NextId++;
}
if (md.getReplicationHandler().IsMaster)
{
operation.OperationId = operationId;
}
if (!log.Contains(operation))
{
log.Add(operation);
}
md.getReplicationHandler().syncOperation(operation);
}
private void executeOperation(MetaDataOperation operation)
{
if (replicationHandler.IsMaster)
{
safeExecuteOperation(operation);
}
else
{
Console.WriteLine("#MDS " + Id + " [SLAVE] - " + operation);
int masterId = replicationHandler.MasterNodeId;
throw new NotMasterException("please execute the operation on the master: " + masterId, masterId);
}
}
private void safeExecuteOperation(MetaDataOperation operation)
{
if (isFailing)
{
throw new Exception("MDS " + Id + " is failing");
}
else if (isRecovering)
{
requestsQueue.Enqueue(operation);
}
else
{
Console.WriteLine("#MDS " + Id + (replicationHandler.IsMaster ? " [MASTER] - " : " [SLAVE] ") + operation);
Log.registerOperation(this, operation);
operation.execute(this);
Log.incrementStatus();
}
}
public void syncOperation(MetaDataOperation operation)
{
if (IsMaster)
{
List<MetaDataOperation> operations = new List<MetaDataOperation>();
operations.Add(operation);
sendAliveMessage(new MetaDataServerAliveMessage(MetadataServerId, IsMaster, operations));
}
}
