|
public static TransactionGet ( |
||
| transaction | ||
| key | Slice | |
| snapshot | bool | |
| return | ||
public Task <Slice[]> GetValuesAsync(ReadOnlySpan <Slice> keys, bool snapshot, CancellationToken ct)
{
Contract.Requires(keys != null);
if (keys.Length == 0)
{
return(Task.FromResult(Array.Empty <Slice>()));
}
var futures = new FutureHandle[keys.Length];
try
{
//REVIEW: as of now (700), there is no way to read multiple keys in a single API call
for (int i = 0; i < keys.Length; i++)
{
futures[i] = FdbNative.TransactionGet(m_handle, keys[i].Span, snapshot);
}
}
catch
{
// cancel all requests leading up to the failure
for (int i = 0; i < futures.Length; i++)
{
if (futures[i] == null)
{
break;
}
futures[i].Dispose();
}
throw;
}
return(FdbFuture.CreateTaskFromHandleArray(futures, (h) => GetValueResultBytes(h), ct));
}
public Task <Slice[]> GetValuesAsync(Slice[] keys, bool snapshot, CancellationToken ct)
{
Contract.Requires(keys != null);
if (keys.Length == 0)
{
return(Task.FromResult(Array.Empty <Slice>()));
}
var futures = new FutureHandle[keys.Length];
try
{
for (int i = 0; i < keys.Length; i++)
{
futures[i] = FdbNative.TransactionGet(m_handle, keys[i], snapshot);
}
}
catch
{
for (int i = 0; i < keys.Length; i++)
{
if (futures[i] == null)
{
break;
}
futures[i].Dispose();
}
throw;
}
return(FdbFuture.CreateTaskFromHandleArray(futures, (h) => GetValueResultBytes(h), ct));
}
public Task <Slice> GetAsync(ReadOnlySpan <byte> key, bool snapshot, CancellationToken ct)
{
return(FdbFuture.CreateTaskFromHandle(
FdbNative.TransactionGet(m_handle, key, snapshot),
(h) => GetValueResultBytes(h),
ct
));
}
public Task <(FdbValueCheckResult Result, Slice Actual)> CheckValueAsync(ReadOnlySpan <byte> key, Slice expected, bool snapshot, CancellationToken ct)
{
return(FdbFuture.CreateTaskFromHandle(
FdbNative.TransactionGet(m_handle, key, snapshot),
(h) =>
{
if (TryPeekValueResultBytes(h, out var actual))
{ // key exists
return !expected.IsNull && expected.Span.SequenceEqual(actual) ? (FdbValueCheckResult.Success, expected) : (FdbValueCheckResult.Failed, Slice.Copy(actual));
}
public Task <Slice> GetAsync(Slice key, bool snapshot, CancellationToken ct)
{
var future = FdbNative.TransactionGet(m_handle, key, snapshot);
return(FdbFuture.CreateTaskFromHandle(future, (h) => GetValueResultBytes(h), ct));
}
