public override void CheckExistence(DryadLinqContext context, Uri dataSetUri, bool deleteIfExists)
{
AzureCollectionPartition partition = new AzureCollectionPartition(dataSetUri);
if (partition.IsCollectionExists())
{
if (!deleteIfExists)
{
throw new DryadLinqException("Can't output to existing Azure Blob collection " + dataSetUri.AbsoluteUri);
}
partition.DeleteCollection();
}
}
public override Stream Egress(DryadLinqContext context, Uri dataSetUri)
{
try
{
AzureCollectionPartition partition = new AzureCollectionPartition(dataSetUri);
if (!partition.IsCollectionExists())
{
throw new DryadLinqException("Input collection " + dataSetUri + " does not exist");
}
Stream dataSetStream = partition.GetReadStream();
return(dataSetStream);
}
catch (Exception e)
{
throw new DryadLinqException("Can't get Azure stream info for " + dataSetUri, e);
}
}
public override DryadLinqStreamInfo GetStreamInfo(DryadLinqContext context, Uri dataSetUri)
{
Int32 parCnt = 1;
Int64 size = -1;
try
{
AzureCollectionPartition partition = new AzureCollectionPartition(dataSetUri);
if (!partition.IsCollectionExists())
{
throw new DryadLinqException("Input collection " + dataSetUri + " does not exist");
}
parCnt = partition.GetPartition().Count();
size = partition.TotalLength;
}
catch (Exception e)
{
throw new DryadLinqException("Can't get Azure stream info for " + dataSetUri, e);
}
return(new DryadLinqStreamInfo(parCnt, size));
}