private static void ExceptionOnMoveNext(int length, int indexToThrow, bool isOrderable)
{
List <int> ds = new List <int>();
for (int i = 0; i < length; i++)
{
ds.Add(i);
}
Exception userEx = new InvalidOperationException("UserException");
//this is an enumerable that will execute user actions on move next, current and dispose
//in this case we will set it to throw on MoveNext for specified index
UserActionEnumerable <int> customEnumerable = new UserActionEnumerable <int>(ds);
Action <int> moveNextUserAction = (currentElement) =>
{
if (currentElement == indexToThrow)
{
throw userEx;
}
;
};
customEnumerable.MoveNextAction = moveNextUserAction;
var partitioner = Partitioner.Create <int>(customEnumerable, EnumerablePartitionerOptions.NoBuffering);
var exception = Assert.Throws <AggregateException>(() => Parallel.ForEach(partitioner, (index) => { }));
VerifyAggregateException(exception, userEx);
Assert.True(customEnumerable.AreEnumeratorsDisposed());
}
private static void OneMoveNext(int length, bool isOrderable)
{
Debug.WriteLine("Length: {0} IsOrderable: {1}", length, isOrderable);
List <int> ds = new List <int>();
for (int i = 0; i < length; i++)
{
ds.Add(i);
}
int dataSourceMoveNextCalls = 0;
//this is an enumerable that will execute user actions on move next, current and dispose
//in this case we will set it to wait on MoveNext for the even indexes
UserActionEnumerable <int> customEnumerable = new UserActionEnumerable <int>(ds);
Action <int> moveNextUserAction = (currentElement) =>
{
//keep track how many times the move next of the data source was called
//it is expected as
//every call of MoveNext on partitioner>GetDynamicPartions.GetEnumerator
//to result in only one call of datasource Move Next
//there is not need to guard for concurrency issues because this scenario is single threaded
dataSourceMoveNextCalls++;
};
customEnumerable.MoveNextAction = moveNextUserAction;
var partitioner = Partitioner.Create <int>(customEnumerable, EnumerablePartitionerOptions.NoBuffering);
//get the dynamic partitions - enumerator
if (isOrderable)
{
IEnumerator <KeyValuePair <long, int> > enumerator = partitioner.GetOrderableDynamicPartitions().GetEnumerator();
while (enumerator.MoveNext())
{
Assert.Equal(dataSourceMoveNextCalls, 1);
//reset the count - for the next moveNext call
dataSourceMoveNextCalls = 0;
}
}
else
{
IEnumerator <int> enumerator = partitioner.GetDynamicPartitions().GetEnumerator();
while (enumerator.MoveNext())
{
Assert.Equal(dataSourceMoveNextCalls, 1);
//reset the count - for the next moveNext call
dataSourceMoveNextCalls = 0;
}
}
}
private static void PFEDisposeEnum(int length)
{
List <int> ds = new List <int>();
for (int i = 0; i < length; i++)
{
ds.Add(i);
}
//this is an enumerable that will execute user actions on move next, current and dispose
//in this case we will set it to wait on MoveNext for the even indexes
UserActionEnumerable <int> customEnumerable = new UserActionEnumerable <int>(ds);
ConcurrentQueue <int> savedDS = new ConcurrentQueue <int>();
var partitioner = Partitioner.Create <int>(customEnumerable, EnumerablePartitionerOptions.NoBuffering);
Parallel.ForEach(partitioner, (index) =>
{
savedDS.Enqueue(index);
});
Assert.True(customEnumerable.AreEnumeratorsDisposed());
Assert.True(CompareCollections(savedDS, ds));
}