public bool TryAppend(byte[] buffer, TapeAppendCondition condition)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (buffer.Length == 0)
{
throw new ArgumentException("Buffer must contain at least one byte.");
}
try
{
_storage.AddOrUpdate(_name, s =>
{
condition.Enforce(0);
return(new List <byte[]>
{
buffer
});
}, (s, list) =>
{
condition.Enforce(list.Count);
list.Add(buffer);
return(list);
});
return(true);
}
catch (TapeAppendConditionException)
{
return(false);
}
}
public bool TryAppend(byte[] buffer, TapeAppendCondition condition)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (buffer.Length == 0)
{
throw new ArgumentException("Buffer must contain at least one byte.");
}
using (var file = OpenForWrite())
{
// we need to know version first.
file.Seek(0, SeekOrigin.End);
var version = ReadVersionFromTheEnd(file);
if (!condition.Satisfy(version))
{
return(false);
}
var versionToWrite = version + 1;
using (var writer = new BinaryWriter(file))
{
WriteBlockInner(writer, buffer, versionToWrite);
}
return(true);
}
}
public bool AppendNonAtomic(IEnumerable <byte[]> records, TapeAppendCondition condition = default(TapeAppendCondition))
{
if (records == null)
{
throw new ArgumentNullException("records");
}
return(Write(w =>
{
var version = w.IndexWriter.BaseStream.Position / sizeof(long);
if (!condition.Satisfy(version))
{
return false;
}
var recordsArray = records.ToArray();
if (version > long.MaxValue - 1)
{
throw new IndexOutOfRangeException("Version is more than long.MaxValue.");
}
Append(w, recordsArray, version + 1);
return true;
}));
}
public bool TryAppend(byte[] buffer, TapeAppendCondition condition)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (buffer.Length == 0)
{
throw new ArgumentException("Buffer must contain at least one byte.");
}
using (var connection = new SqlConnection(_connectionString))
{
connection.Open();
var version = GetCurrentVersion(connection);
if (!condition.Satisfy(version))
{
return(false);
}
if (version > long.MaxValue - 1)
{
throw new IndexOutOfRangeException("Version is more than long.MaxValue.");
}
version++;
Append(connection, version, buffer);
}
return(true);
}
public bool TryAppend(byte[] buffer, TapeAppendCondition condition)
{
if (buffer == null)
throw new ArgumentNullException("buffer");
if (buffer.Length == 0)
throw new ArgumentException("Buffer must contain at least one byte.");
try
{
_storage.AddOrUpdate(_name, s =>
{
condition.Enforce(0);
return new List<byte[]>
{
buffer
};
}, (s, list) =>
{
condition.Enforce(list.Count);
list.Add(buffer);
return list;
});
return true;
}
catch (TapeAppendConditionException)
{
return false;
}
}
public void Specified_condition_is_matched_for_empty_storage()
{
var version = _stream.GetCurrentVersion();
var success = _stream.TryAppend(_batch[0], TapeAppendCondition.VersionIs(version));
Assert.IsTrue(success, "Appending records should succeed");
var currentVersion = _stream.GetCurrentVersion();
Assert.Greater(currentVersion, version, "Version should change");
}
public void Specified_condition_is_verified_for_empty_storage()
{
var previousVersion = _stream.GetCurrentVersion();
Assert.AreEqual(0, previousVersion, "Version should be zero");
var result = _stream.TryAppend(_batch[0], TapeAppendCondition.VersionIs(1));
Assert.IsFalse(result, "Appending records should fail");
var currentVersion = _stream.GetCurrentVersion();
Assert.AreEqual(previousVersion, currentVersion, "Version should not change");
}
public bool TryAppend(byte[] buffer, TapeAppendCondition condition)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (buffer.Length == 0)
{
throw new ArgumentException("Buffer must contain at least one byte.");
}
return(Write(w => TryAppendInternal(w, buffer, condition)));
}
public void Specified_condition_is_verified_for_non_empty_storage()
{
var previousVersion = _stream.GetCurrentVersion();
_stream.TryAppend(_batch[0]);
var currentVersion1 = _stream.GetCurrentVersion();
Assert.Greater(currentVersion1, previousVersion, "Version should be equal to one");
var result = _stream.TryAppend(_batch[1], TapeAppendCondition.VersionIs(previousVersion));
Assert.IsFalse(result, "Appending records should fail");
var currentVersion2 = _stream.GetCurrentVersion();
Assert.AreEqual(currentVersion1, currentVersion2, "Version should not change");
}
static bool TryAppendInternal(Writers writers, byte[] buffer, TapeAppendCondition condition)
{
var version = writers.IndexWriter.BaseStream.Position / sizeof(long);
if (!condition.Satisfy(version))
{
return(false);
}
if (version > long.MaxValue - 1)
{
throw new IndexOutOfRangeException("Version is more than long.MaxValue.");
}
Append(writers, new[] { buffer }, version + 1);
return(true);
}
public bool TryAppend(byte[] buffer, TapeAppendCondition appendCondition = new TapeAppendCondition())
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (buffer.Length == 0)
{
throw new ArgumentException("Buffer must contain at least one byte.");
}
long version;
int lastBlockSize;
long offset;
long firstVersion;
long count;
List <string> blockNames;
var blob = _container.GetBlockBlobReference(_blobName);
if (blob.Exists())
{
var blockList = blob.DownloadBlockList().ToArray();
blockNames = blockList.Select(bl => bl.Name).ToList();
var lastBlock = blockList.LastOrDefault();
if (default(ListBlockItem) == lastBlock)
{
version = 0;
lastBlockSize = int.MaxValue;
offset = 0;
firstVersion = 1;
count = 0;
}
else
{
var nameInfo = Naming.GetInfo(DecodeName(lastBlock.Name));
firstVersion = nameInfo.FirstVersion;
version = nameInfo.FirstVersion - 1 + nameInfo.Count;
count = nameInfo.Count;
if (lastBlock.Size > int.MaxValue)
{
throw new InvalidOperationException("last block size must be in 'int' range");
}
lastBlockSize = (int)lastBlock.Size;
offset = blockList.Reverse().Skip(1).Sum(l => l.Size);
}
}
else
{
version = 0;
lastBlockSize = int.MaxValue;
offset = 0;
firstVersion = 1;
count = 0;
blockNames = new List <string>();
}
if (!appendCondition.Satisfy(version))
{
return(false);
}
if (version > long.MaxValue - 1)
{
throw new IndexOutOfRangeException("Version is more than long.MaxValue.");
}
if (buffer.Length > FourMb)
{
throw new ArgumentException("buffer size must be less than or equal to 4 Mb", "buffer");
}
using (var outStream = new MemoryStream())
{
if (buffer.Length < MaxBlockSize && lastBlockSize <= MaxBlockSize - buffer.Length)
{
// read old block
using (var s = blob.OpenRead())
{
s.Seek(offset, SeekOrigin.Begin);
s.CopyTo(outStream);
TapeStreamSerializer.WriteRecord(outStream, buffer, version + 1);
count++;
blockNames.RemoveAt(blockNames.Count - 1);
}
}
else
{
TapeStreamSerializer.WriteRecord(outStream, buffer, version + 1);
firstVersion = version + 1;
count = 1;
}
var blockId = EncodeName(Naming.GetName(firstVersion, count));
string md5Hash;
outStream.Seek(0, SeekOrigin.Begin);
using (var md5 = MD5.Create()) {
md5Hash = Convert.ToBase64String(md5.ComputeHash(outStream));
}
outStream.Seek(0, SeekOrigin.Begin);
blob.PutBlock(blockId, outStream, md5Hash);
blockNames.Add(blockId);
blob.PutBlockList(blockNames);
return(true);
}
}
public bool TryAppend(byte[] buffer, TapeAppendCondition condition)
{
if (buffer == null)
throw new ArgumentNullException("buffer");
if (buffer.Length == 0)
throw new ArgumentException("Buffer must contain at least one byte.");
using (var file = OpenForWrite())
{
// we need to know version first.
file.Seek(0, SeekOrigin.End);
var version = ReadVersionFromTheEnd(file);
if (!condition.Satisfy(version))
return false;
var versionToWrite = version + 1;
using (var writer = new BinaryWriter(file))
{
WriteBlockInner(writer, buffer, versionToWrite);
}
return true;
}
}
