/// <exception cref="System.IO.IOException"/>
private void MakeRequest()
{
idx = 0;
entries = null;
entries = MakeRequest(prevKey);
if (entries.Size() == 0)
{
entries = null;
}
}
/// <exception cref="System.IO.IOException"/>
public override BatchedRemoteIterator.BatchedEntries <CacheDirectiveEntry> MakeRequest
(long prevKey)
{
BatchedRemoteIterator.BatchedEntries <CacheDirectiveEntry> entries = null;
TraceScope scope = Trace.StartSpan("listCacheDirectives", traceSampler);
try
{
entries = namenode.ListCacheDirectives(prevKey, filter);
}
catch (IOException e)
{
if (e.Message.Contains("Filtering by ID is unsupported"))
{
// Retry case for old servers, do the filtering client-side
long id = filter.GetId();
filter = RemoveIdFromFilter(filter);
// Using id - 1 as prevId should get us a window containing the id
// This is somewhat brittle, since it depends on directives being
// returned in order of ascending ID.
entries = namenode.ListCacheDirectives(id - 1, filter);
for (int i = 0; i < entries.Size(); i++)
{
CacheDirectiveEntry entry = entries.Get(i);
if (entry.GetInfo().GetId().Equals((long)id))
{
return(new CacheDirectiveIterator.SingleEntry(entry));
}
}
throw new RemoteException(typeof(InvalidRequestException).FullName, "Did not find requested id "
+ id);
}
throw;
}
finally
{
scope.Close();
}
Preconditions.CheckNotNull(entries);
return(entries);
}
/// <exception cref="System.IO.IOException"/>
private void MakeRequestIfNeeded()
{
if (idx == -1)
{
MakeRequest();
}
else
{
if ((entries != null) && (idx >= entries.Size()))
{
if (!entries.HasMore())
{
// Last time, we got fewer entries than requested.
// So we should be at the end.
entries = null;
}
else
{
MakeRequest();
}
}
}
}
public BatchedRemoteIterator(K prevKey)
{
this.prevKey = prevKey;
this.entries = null;
this.idx = -1;
}
