public async void Test_Case_10()
{
using (var zedb = await OpenTestDatabaseAsync())
{
var db = FoundationDB.Filters.Logging.FdbLoggingExtensions.Logged(zedb, (tr) => Log(tr.Log.GetTimingsReport(true)));
{
var subspace = db.GlobalSpace;
// clear everything and write some values
await db.WriteAsync((tr) =>
{
tr.ClearRange(subspace.Keys.Encode("K0000"), subspace.Keys.Encode("K9999Z"));
for (int i = 0; i < 100; i++)
{
tr.Set(subspace.Keys.Encode("K" + i.ToString("D4")), Slice.FromString("V" + i.ToString("D4")));
}
}, this.Cancellation);
using (var tr = db.BeginTransaction(this.Cancellation))
{
tr.ClearRange(subspace.Keys.Encode("K0010"), subspace.Keys.Encode("K0020"));
tr.ClearRange(subspace.Keys.Encode("K0050"), subspace.Keys.Encode("K0060"));
var chunk = await tr.GetRangeAsync(
KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0000")),
KeySelector.LastLessOrEqual(subspace.Keys.Encode("K9999")),
new FdbRangeOptions { Mode = FdbStreamingMode.WantAll, Reverse = true }
);
//no commit
}
}
}
}
private async Task <Chunk> GetChunkAtAsync([NotNull] IFdbTransaction trans, long offset)
{
Contract.Requires(trans != null && offset >= 0);
var chunkKey = await trans.GetKeyAsync(KeySelector.LastLessOrEqual(DataKey(offset))).ConfigureAwait(false);
if (chunkKey.IsNull)
{ // nothing before (sparse)
return(default(Chunk));
}
if (chunkKey < DataKey(0))
{ // off beginning
return(default(Chunk));
}
long chunkOffset = DataKeyOffset(chunkKey);
Slice chunkData = await trans.GetAsync(chunkKey).ConfigureAwait(false);
if (chunkOffset + chunkData.Count <= offset)
{ // in sparse region after chunk
return(default(Chunk));
}
return(new Chunk(chunkKey, chunkData, chunkOffset));
}
public async Task Test_Case_10()
{
using (var db = await OpenTestPartitionAsync())
{
db.SetDefaultLogHandler((log) => Log(log.GetTimingsReport(true)));
// clear everything and write some values
await db.WriteAsync(async tr =>
{
var subspace = await db.Root.Resolve(tr);
tr.ClearRange(subspace.Encode("K0000"), subspace.Encode("K9999Z"));
for (int i = 0; i < 100; i++)
{
tr.Set(subspace.Encode("K" + i.ToString("D4")), Value("V" + i.ToString("D4")));
}
}, this.Cancellation);
using (var tr = await db.BeginTransactionAsync(this.Cancellation))
{
var subspace = await db.Root.Resolve(tr);
tr.ClearRange(subspace.Encode("K0010"), subspace.Encode("K0020"));
tr.ClearRange(subspace.Encode("K0050"), subspace.Encode("K0060"));
_ = await tr.GetRangeAsync(
KeySelector.FirstGreaterOrEqual(subspace.Encode("K0000")),
KeySelector.LastLessOrEqual(subspace.Encode("K9999")),
new FdbRangeOptions { Mode = FdbStreamingMode.WantAll, Reverse = true }
);
//no commit
}
}
}
private async Task <long> ComputeSizeAsync(IFdbReadOnlyTransaction tr)
{
Contract.Requires(tr != null);
var keyRange = this.Subspace.Keys.ToRange();
var lastKey = await tr.GetKeyAsync(KeySelector.LastLessOrEqual(keyRange.End)).ConfigureAwait(false);
if (lastKey < keyRange.Begin)
{
return(0);
}
return(this.Subspace.Keys.DecodeFirst <long>(lastKey) + 1);
}
public async void Test_Case_11()
{
using (var zedb = await OpenTestDatabaseAsync())
{
var db = FoundationDB.Filters.Logging.FdbLoggingExtensions.Logged(zedb, (tr) => Log(tr.Log.GetTimingsReport(true)));
{
var subspace = db.GlobalSpace;
// clear everything and write some values
await db.WriteAsync((tr) =>
{
tr.ClearRange(subspace.Keys.Encode("K0000"), subspace.Keys.Encode("K9999Z"));
for (int i = 0; i < 100; i++)
{
tr.Set(subspace.Keys.Encode("K" + i.ToString("D4")), Slice.FromString("V" + i.ToString("D4")));
}
}, this.Cancellation);
using (var tr = db.BeginTransaction(this.Cancellation))
{
tr.ClearRange(subspace.Keys.Encode("K0010"), subspace.Keys.Encode("K0020"));
tr.ClearRange(subspace.Keys.Encode("K0050"), subspace.Keys.Encode("K0060"));
tr.Set(subspace.Keys.Encode("K0021"), Slice.Empty);
tr.Set(subspace.Keys.Encode("K0042"), Slice.Empty);
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0005")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0010")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0015")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0022")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0049")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0050")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0055")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0061")));
//no commit
}
using (var tr = db.BeginTransaction(this.Cancellation))
{
//tr.SetOption(FdbTransactionOption.ReadYourWritesDisable);
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0000"))); // equal=false, offset=1
await tr.GetKeyAsync(KeySelector.FirstGreaterThan(subspace.Keys.Encode("K0011"))); // equal=true, offset=1
await tr.GetKeyAsync(KeySelector.LastLessOrEqual(subspace.Keys.Encode("K0022"))); // equal=true, offset=0
await tr.GetKeyAsync(KeySelector.LastLessThan(subspace.Keys.Encode("K0033"))); // equal=false, offset=0
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Keys.Encode("K0040")) + 1000); // equal=false, offset=7 ?
await tr.GetKeyAsync(KeySelector.LastLessThan(subspace.Keys.Encode("K0050")) + 1000); // equal=false, offset=6 ?
}
}
}
}
/// <summary>
/// Read from the blob, starting at <paramref name="offset"/>, retrieving up to <paramref name="n"/> bytes (fewer then n bytes are returned when the end of the blob is reached).
/// </summary>
public async Task <Slice> ReadAsync([NotNull] IFdbReadOnlyTransaction trans, long offset, int n)
{
if (trans == null)
{
throw new ArgumentNullException("trans");
}
if (offset < 0)
{
throw new ArgumentNullException("offset", "Offset cannot be less than zero");
}
long?size = await GetSizeAsync(trans).ConfigureAwait(false);
if (size == null)
{
return(Slice.Nil); // not found
}
if (offset >= size.Value)
{
return(Slice.Empty);
}
// read all chunks matching the segment we need, and copy them in our buffer
var buffer = new byte[Math.Min(n, size.Value - offset)];
await trans
.GetRange(
KeySelector.LastLessOrEqual(DataKey(offset)),
KeySelector.FirstGreaterOrEqual(DataKey(offset + n))
)
.ForEachAsync((chunk) =>
{
// get offset of this chunk
long chunkOffset = DataKeyOffset(chunk.Key);
Slice chunkData = chunk.Value;
checked
{
// intersect chunk bounds with output
int delta = (int)(chunkOffset - offset);
int start = delta;
int end = delta + chunkData.Count;
if (start < 0)
{
start = 0;
}
if (end > n)
{
end = n;
}
// compute the relative offsets in the chunk
int rStart = start - delta;
int rEnd = end - delta;
var intersect = chunkData[rStart, rEnd];
if (intersect.IsPresent)
{ // copy the data that fits
intersect.CopyTo(buffer, start);
}
}
})
.ConfigureAwait(false);
return(new Slice(buffer, 0, buffer.Length));
}
public async Task Test_Case_11()
{
using (var db = await OpenTestPartitionAsync())
{
db.SetDefaultLogHandler((log) => Log(log.GetTimingsReport(true)));
var location = db.Root;
// clear everything and write some values
await db.WriteAsync(async tr =>
{
var subspace = await location.Resolve(tr);
tr.ClearRange(subspace.Encode("K0000"), subspace.Encode("K9999Z"));
for (int i = 0; i < 100; i++)
{
tr.Set(subspace.Encode("K" + i.ToString("D4")), Value("V" + i.ToString("D4")));
}
}, this.Cancellation);
using (var tr = await db.BeginTransactionAsync(this.Cancellation))
{
var subspace = await location.Resolve(tr);
tr.ClearRange(subspace.Encode("K0010"), subspace.Encode("K0020"));
tr.ClearRange(subspace.Encode("K0050"), subspace.Encode("K0060"));
tr.Set(subspace.Encode("K0021"), Slice.Empty);
tr.Set(subspace.Encode("K0042"), Slice.Empty);
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Encode("K0005")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Encode("K0010")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Encode("K0015")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Encode("K0022")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Encode("K0049")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Encode("K0050")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Encode("K0055")));
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Encode("K0061")));
//no commit
}
using (var tr = await db.BeginTransactionAsync(this.Cancellation))
{
var subspace = await location.Resolve(tr);
//tr.SetOption(FdbTransactionOption.ReadYourWritesDisable);
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Encode("K0000"))); // equal=false, offset=1
await tr.GetKeyAsync(KeySelector.FirstGreaterThan(subspace.Encode("K0011"))); // equal=true, offset=1
await tr.GetKeyAsync(KeySelector.LastLessOrEqual(subspace.Encode("K0022"))); // equal=true, offset=0
await tr.GetKeyAsync(KeySelector.LastLessThan(subspace.Encode("K0033"))); // equal=false, offset=0
await tr.GetKeyAsync(KeySelector.FirstGreaterOrEqual(subspace.Encode("K0040")) + 1000); // equal=false, offset=7 ?
await tr.GetKeyAsync(KeySelector.LastLessThan(subspace.Encode("K0050")) + 1000); // equal=false, offset=6 ?
}
}
}