private IAsyncResult RemoteAsyncCallView(TupleSpace space)
{
AsyncViewDelegate RemoteDel = new AsyncViewDelegate(space.RequestView);
IAsyncResult RemAr = RemoteDel.BeginInvoke(null, null);
return(RemAr);
}
private Dictionary <string, TupleSpace> GetViews()
{
List <string> leaderView = null;
leaderView = GetLeaderView();
Dictionary <string, TupleSpace> result = new Dictionary <string, TupleSpace>();
if (leaderView != null)
{
foreach (string server in leaderView)
{
result[server] = (TupleSpace)TupleSpaces[server];
}
//Console.WriteLine(String.Join(",", leaderView));
return(result);
}
while (leaderView == null)
{
Dictionary <string, KeyValuePair <IAsyncResult, WaitHandle> > results = new Dictionary <string, KeyValuePair <IAsyncResult, WaitHandle> >();
List <WaitHandle> waits = new List <WaitHandle>();
foreach (KeyValuePair <string, Pingable> entry in TupleSpaces)
{
//IAsyncResult ar = RemoteAsyncCallTakeSelect(space, schema, id, seq);
IAsyncResult ar = RemoteAsyncCallView((TupleSpace)entry.Value);
results.Add(entry.Key, new KeyValuePair <IAsyncResult, WaitHandle>(ar, ar.AsyncWaitHandle));
waits.Add(ar.AsyncWaitHandle);
}
WaitHandle.WaitAll(waits.ToArray(), 500);
List <List <string> > views = new List <List <string> >();
foreach (var entry in results)
{
if (entry.Value.Value.WaitOne(0))
{
AsyncViewDelegate del = (AsyncViewDelegate)((AsyncResult)entry.Value.Key).AsyncDelegate;
try { leaderView = del.EndInvoke(entry.Value.Key); } catch (Exception e) {}
if (leaderView != null)
{
currentLeader = entry.Key;
break;
}
}
}
}
foreach (string server in new HashSet <string>(leaderView))
{
result[server] = (TupleSpace)TupleSpaces[server];
}
//Console.WriteLine(String.Join(",", leaderView));
return(result);
}
private List <string> GetLeaderView()
{
List <string> result = null;
if (currentLeader == null)
{
return(null);
}
IAsyncResult ar = RemoteAsyncCallView((TupleSpace)TupleSpaces[currentLeader]);
WaitHandle wait = ar.AsyncWaitHandle;
if (wait.WaitOne(500))
{
AsyncViewDelegate del = (AsyncViewDelegate)((AsyncResult)ar).AsyncDelegate;
try { result = del.EndInvoke(ar); } catch (Exception e) { /* Console.WriteLine(e);*/ }
}
return(result);
}
