|
public static TransactionGetRange ( |
||
| transaction | ||
| begin | FdbKeySelector | |
| end | FdbKeySelector | |
| limit | int | |
| targetBytes | int | |
| mode | FdbStreamingMode | |
| iteration | int | |
| snapshot | bool | |
| reverse | bool | |
| return | ||
/// <summary>Asynchronously fetch a new page of results</summary>
/// <returns>True if Chunk contains a new page of results. False if all results have been read.</returns>
public Task <FdbRangeChunk> GetRangeAsync(KeySelector begin, KeySelector end, FdbRangeOptions options, int iteration, bool snapshot, CancellationToken ct)
{
Contract.Requires(options != null);
bool reversed = options.Reverse ?? false;
var future = FdbNative.TransactionGetRange(m_handle, begin, end, options.Limit ?? 0, options.TargetBytes ?? 0, options.Mode ?? FdbStreamingMode.Iterator, iteration, snapshot, reversed);
return(FdbFuture.CreateTaskFromHandle(
future,
(h) =>
{
var mode = options.Read ?? FdbReadMode.Both;
KeyValuePair <Slice, Slice>[] items;
bool hasMore;
Slice first, last;
switch (mode)
{
case FdbReadMode.Both:
{
items = GetKeyValueArrayResult(h, out hasMore, out first, out last);
break;
}
case FdbReadMode.Keys:
{
items = GetKeyValueArrayResultKeysOnly(h, out hasMore, out first, out last);
break;
}
case FdbReadMode.Values:
{
items = GetKeyValueArrayResultValuesOnly(h, out hasMore, out first, out last);
break;
}
default:
{
throw new InvalidOperationException();
}
}
return new FdbRangeChunk(items, hasMore, iteration, reversed, mode, first, last);
},
ct
));
}
/// <summary>Asynchronously fetch a new page of results</summary>
/// <returns>True if Chunk contains a new page of results. False if all results have been read.</returns>
public Task <FdbRangeChunk> GetRangeAsync(KeySelector begin, KeySelector end, FdbRangeOptions options, int iteration, bool snapshot, CancellationToken ct)
{
Contract.Requires(options != null);
bool reversed = options.Reverse ?? false;
var future = FdbNative.TransactionGetRange(m_handle, begin, end, options.Limit ?? 0, options.TargetBytes ?? 0, options.Mode ?? FdbStreamingMode.Iterator, iteration, snapshot, reversed);
return(FdbFuture.CreateTaskFromHandle(
future,
(h) =>
{
// TODO: quietly return if disposed
var chunk = GetKeyValueArrayResult(h, out bool hasMore);
return new FdbRangeChunk(hasMore, chunk, iteration, reversed);
},
ct
));
}
/// <summary>Asynchronously fetch a new page of results</summary>
/// <returns>True if Chunk contains a new page of results. False if all results have been read.</returns>
public Task <FdbRangeChunk> GetRangeAsync(KeySelector begin, KeySelector end, int limit, bool reversed, int targetBytes, FdbStreamingMode mode, FdbReadMode read, int iteration, bool snapshot, CancellationToken ct)
{
var future = FdbNative.TransactionGetRange(m_handle, begin, end, limit, targetBytes, mode, iteration, snapshot, reversed);
return(FdbFuture.CreateTaskFromHandle(
future,
(h) =>
{
KeyValuePair <Slice, Slice>[] items;
bool hasMore;
Slice first, last;
switch (read)
{
case FdbReadMode.Both:
{
items = GetKeyValueArrayResult(h, out hasMore, out first, out last);
break;
}
case FdbReadMode.Keys:
{
items = GetKeyValueArrayResultKeysOnly(h, out hasMore, out first, out last);
break;
}
case FdbReadMode.Values:
{
items = GetKeyValueArrayResultValuesOnly(h, out hasMore, out first, out last);
break;
}
default:
{
throw new InvalidOperationException();
}
}
return new FdbRangeChunk(items, hasMore, iteration, reversed, read, first, last);
},
ct
));
}
