public void RegisterMetadata(string address)
{
MetadataServerInfo mi = new MetadataServerInfo(address);
msi[mi.getID(base_port)] = mi;
// Console.WriteLine("MetadataServer at " + address + " has registered.");
}
private void getMetadataDatabase()
{
if (msi == null)
{
throw new System.ApplicationException("MetadataServer.getMetadataDatabase: there are no metadata servers registered in local server... Recover will not be possible!");
}
Console.WriteLine("Recovering metadata server number " + (this.metadataPort - this.base_port) + "...");
for (int i = 0; i < msi.GetLength(0); i++)
{
MetadataServerInfo mi = msi[i];
if (mi != null)
{
try
{
metadataDB = ((MetadataMessageService)Activator.GetObject(typeof(MetadataMessageService), "tcp://localhost:" + mi.port + "/DataMessageService")).MetadataTransfer();
int msID = mi.getID(base_port);
Console.WriteLine("Metadata successfully tranfered from metadata server number " + msID + ".");
return;
}
catch (Exception e)
{
onlineMS[mi.getID(base_port)] = false;
msi[i] = null;
}
}
}
}
// Data server register from data server itself
public void Register(string address)
{
DataServerInfo dsi = new DataServerInfo(address);
Monitor.Enter(onlineDataServers);
onlineDataServers.Add(dsi);
Monitor.Exit(onlineDataServers);
for (int i = 0; i < msi.GetLength(0); i++)
{
MetadataServerInfo mi = msi[i];
if (mi != null && mi.port != this.metadataPort)
{
try
{
MetadataMessageService metadataServer = (MetadataMessageService)Activator.GetObject(typeof(MetadataMessageService), "tcp://localhost:" + mi.port + "/MessageService");
metadataServer.RegisterDataReplica(dsi.address);
}
catch (RemotingException e)
{
onlineMS[mi.getID(base_port)] = false;
msi[i] = null;
}
catch (SocketException e)
{
onlineMS[mi.getID(base_port)] = false;
msi[i] = null;
}
}
}
// Console.WriteLine("DataServer at " + address + " has registered.");
}
/**
* Consensus Client-Metadata Servers for active replication: send response to client and save metadata of created file
**/
public MetadataDTO createCommit(MetadataQuorumDto dataservers, string fileName, int nbDataServers, int readQuorum, int writeQuorum)
{
MetadataDTO metadataDTO;
freezer.WaitOne();
//next if-else is for load balancing the file creation task for selected metadata server from client
if (dataservers.runCreate(metadataPort))
{
int ticket = getTicket();
int timestamp = dataservers.timestamps[metadataPort - base_port];
Dictionary <string, string> dataServers = CreateFileOnServers(dataservers.Dataservers, fileName, nbDataServers);
metadataDTO = new MetadataDTO(nbDataServers, readQuorum, writeQuorum, dataServers, ticket);
MetadataContent metadata = new MetadataContent(metadataDTO, __OPEN__, timestamp);
metadataDB.Add(fileName, metadata);
for (int i = 0; i < msi.GetLength(0); i++)
{
MetadataServerInfo mi = msi[i];
if (mi != null)
{
//indirect hearbeat for metadata being up or down
try
{
((MetadataMessageService)Activator.GetObject(typeof(MetadataMessageService), "tcp://localhost:" + mi.port + "/DataMessageService")).SendMetadataDto(fileName, metadataDTO, dataservers);
int msID = mi.getID(base_port);
Console.WriteLine("Metadata successfully tranfered from metadata server number " + msID + ".");
}
catch (Exception e)
{
onlineMS[mi.getID(base_port)] = false;
msi[i] = null;
}
}
}
Console.WriteLine("File \"" + fileName + "\" created by client in elected metadata server.");
return(metadataDTO);
}
else
{
throw new System.ApplicationException("createCommit: unexpected run in non elected metadata server");
}
}
