public override bool Equals(Object obj)
{
if (obj == null || GetType() != obj.GetType())
{
return(false);
}
MyPadInt p = (MyPadInt)obj;
return(this.Uid == p.Uid);
}
private void addPadInt(MyPadInt obj)
{
int size = padIntsCache.Count;
if (size == CACHE_SIZE)
{
// remover o PadInt mais antigo
Console.WriteLine("Oldest PadInt removed ");
padIntsCache.RemoveAt(0);
}
padIntsCache.Add(obj);
}
public IPadInt CreatePadInt(int uid)
{
try {
Console.WriteLine("[CREATE] Client wants to create PadInt with id " + uid);
if (!padInts.Contains(uid))
{
if (dataServers.Count == 0)
{
Console.WriteLine("[!CREATE] Error: There are no available DataServers");
Console.WriteLine("---");
return(null);
}
DataServerInfo dServer = (DataServerInfo)dataServers[indexLastServer];
while (dServer.remoteServer.isFail)
{
Console.WriteLine("[CREATE] DataServer " + dServer.Name /*dServer.remoteServer.name*/ + " is set to [Fail]: Passing his turn on Round Robin");
indexLastServer = (indexLastServer + 1) % dataServers.Count; // salta um índice
dServer = (DataServerInfo)dataServers[indexLastServer];
}
IPadInt obj = dServer.remoteServer.store(uid);
// obj nao vem nunca a null porque controlámos isso nos ifs anteriores...
// Round Robin:
indexLastServer = (indexLastServer + 1) % dataServers.Count;
padInts.Add(uid, dServer);
MyPadInt myPadInt = new MyPadInt(uid, obj);
addPadInt(myPadInt);
Console.WriteLine("[CREATE] PadInt " + uid + " stored on " + dServer.Name /*dServer.remoteServer.name*/);
Console.WriteLine("---");
return(obj);
}
else
{
Console.WriteLine("[!CREATE] Error: PadInt " + uid + " already exists.");
Console.WriteLine("---");
return(null);
}
} catch (RemotingException re) {
Console.WriteLine("[CreatePadInt]:\n" + re);
throw new OperationException("CreatePadInt operation at PadInt " + uid + "failed.");
}
}
// Se o server a que esse objecto pertence estiver em Freeze ou Fail, faz sentido
// devolvermos o objecto em cache? Não estamos a violar o comportamento suposto?
//
// mais: ao devolver o url ao client, nao devemos tambem ir buscar o objecto e por na cache?
//
// Se a cache contem o PadInt
// retornamos PadInt
// Caso contrario
// retornamos url
public PadIntInfo AccessPadInt(int uid)
{
try {
Console.WriteLine("[ACCESS] Client requests PadInt with id " + uid);
if (padIntsCache.Contains(new MyPadInt(uid)))
{
int index = padIntsCache.IndexOf(new MyPadInt(uid));
MyPadInt myObj = (MyPadInt)padIntsCache[index];
IPadInt obj = myObj.PadInt;
PadIntInfo padIntInfo = new PadIntInfo(obj);
Console.WriteLine("[ACCESS] PadInt " + uid + " returned from the cache. ");
Console.WriteLine("---");
return(padIntInfo);
}
else if (padInts.Contains(uid))
{
DataServerInfo dServer = (DataServerInfo)padInts[uid];
PadIntInfo padIntInfo = new PadIntInfo(dServer.URL);
Console.WriteLine("[ACCESS] Returned " + dServer.Name /*dServer.remoteServer.name*/ + "'s URL, to further access PadInt " + uid + ".");
Console.WriteLine("---");
IPadInt padInt = dServer.remoteServer.load(uid);
MyPadInt myPadInt = new MyPadInt(uid, padInt);
addPadInt(myPadInt);
return(padIntInfo);
}
else //PadInt nao existe
{
Console.WriteLine("[!ACCESS] Error: PadInt " + uid + " does not exist.");
Console.WriteLine("---");
return(null);
}
} catch (RemotingException re) {
Console.WriteLine("[AccessPadInt]:\n" + re);
throw new OperationException("AccessPadInt operation at PadInt " + uid + "failed.");
}
}