public MetadataDiff BuildDiff(string mark, int sequence)
{
MetadataDiff diff = new MetadataDiff();
foreach (var entry in operations)
{
// skips marks that don't need
if (entry.Key >= sequence)
{
diff.AddOperation(entry.Value);
}
}
return(diff);
}
public void Recover()
{
Console.WriteLine("RECOVER");
// metadata bootup
// since we force a metadata to start with recover
if (master == string.Empty)
{
MetadataBootup();
}
foreach (var entry in metadatas)
{
try
{
IMetadataToMetadata metadata = entry.Value;
// stops on the first not failed metadata
master = metadata.Master();
// sets fail to false so it starts receiving requests
int sequence = clock;
fail = false;
// updates its state with the master
if (!ImMaster)
{
MetadataDiff diff = metadatas[master].UpdateMetadata(id, sequence);
Console.WriteLine("--RECEIVING STATE UPDATE--");
log.MergeDiff(this, diff);
Console.WriteLine("--STATE UPDATE FINISHED--");
}
return;
}
catch (ProcessFailedException) { }
}
// sets fail to false so it starts receiving requests
master = id;
fail = false;
}
public void MergeDiff(Metadata metadata, MetadataDiff diff)
{
foreach (string operation in diff.Operations)
{
string[] words = operation.Split(SEPARATOR);
string methodName = words[0];
switch (methodName)
{
case ("OpenOnMetadata"):
{
string clientId = Helper.DeserializeObject <string>(words[1]);
string filename = Helper.DeserializeObject <string>(words[2]);
int sequence = Helper.DeserializeObject <int>(words[3]);
metadata.OpenOnMetadata(clientId, filename, sequence);
break;
}
case ("CloseOnMetadata"):
{
string clientId = Helper.DeserializeObject <string>(words[1]);
string filename = Helper.DeserializeObject <string>(words[2]);
int sequence = Helper.DeserializeObject <int>(words[3]);
metadata.CloseOnMetadata(clientId, filename, sequence);
break;
}
case ("CreateOnMetadata"):
{
string clientId = Helper.DeserializeObject <string>(words[1]);
string filename = Helper.DeserializeObject <string>(words[2]);
int nbDataServers = Helper.DeserializeObject <int>(words[3]);
int readQuorum = Helper.DeserializeObject <int>(words[4]);
int writeQuorum = Helper.DeserializeObject <int>(words[5]);
int sequence = Helper.DeserializeObject <int>(words[6]);
metadata.CreateOnMetadata(clientId, filename, nbDataServers, readQuorum, writeQuorum, sequence);
break;
}
case ("SelectOnMetadata"):
{
string filename = Helper.DeserializeObject <string>(words[1]);
string dataServerId = Helper.DeserializeObject <string>(words[2]);
string localFilename = Helper.DeserializeObject <string>(words[3]);
int sequence = Helper.DeserializeObject <int>(words[4]);
metadata.SelectOnMetadata(filename, dataServerId, localFilename, sequence);
break;
}
case ("DeleteOnMetadata"):
{
string filename = Helper.DeserializeObject <string>(words[1]);
int sequence = Helper.DeserializeObject <int>(words[2]);
metadata.DeleteOnMetadata(filename, sequence);
break;
}
case ("DataServerOnMetadata"):
{
string dataServerId = Helper.DeserializeObject <string>(words[1]);
string location = Helper.DeserializeObject <string>(words[2]);
int sequence = Helper.DeserializeObject <int>(words[3]);
metadata.DataServerOnMetadata(dataServerId, location, sequence);
break;
}
case ("MigrateFileOnMetadata"):
{
string filename = Helper.DeserializeObject <string>(words[1]);
string oldDataServerId = Helper.DeserializeObject <string>(words[2]);
string newDataServerId = Helper.DeserializeObject <string>(words[3]);
string oldLocalFilename = Helper.DeserializeObject <string>(words[4]);
string newLocalFilename = Helper.DeserializeObject <string>(words[5]);
int sequence = Helper.DeserializeObject <int>(words[6]);
metadata.MigrateFileOnMetadata(filename, oldDataServerId, newDataServerId, oldLocalFilename, newLocalFilename, sequence);
break;
}
default:
{
throw new Exception("METHOD CALL NOT SERIALIZABLE: " + methodName);
}
}
}
}
