public void try_read_does_not_cache_anything_and_returns_record_once_it_is_written_later()
{
var writerchk = new InMemoryCheckpoint(0);
var config = new TransactionFileDatabaseConfig(PathName, "prefix.tf", 10000, writerchk, new ICheckpoint[0]);
// create db
var writer = new MultifileTransactionFileWriter(config);
writer.Open();
var reader = new MultifileTransactionFileChaser(config);
reader.Open();
LogRecord record;
Assert.IsFalse(reader.TryReadNext(out record));
var rec = LogRecord.SingleWrite(0, Guid.NewGuid(), Guid.NewGuid(), "ES", -1, "ET", new byte[] { 7 }, null);
long tmp;
Assert.IsTrue(writer.Write(rec, out tmp));
writer.Flush();
writer.Close();
Assert.IsTrue(reader.TryReadNext(out record));
Assert.AreEqual(rec, record);
reader.Close();
}
public void try_read_returns_false_when_writer_checksum_is_zero()
{
var writerchk = new InMemoryCheckpoint(0);
var config = new TransactionFileDatabaseConfig(PathName, "prefix.tf", 10000, writerchk, new List<ICheckpoint>());
File.WriteAllBytes(Path.Combine(PathName, "prefix.tf0"), new byte[10000]);
var reader = new MultifileTransactionFileChaser(config);
reader.Open();
LogRecord record;
Assert.IsFalse(reader.TryReadNext(out record));
reader.Close();
}
public void try_read_returns_false_when_writer_checksum_is_equal_to_reader_checksum()
{
var writerchk = new InMemoryCheckpoint(12);
var readerchk = new InMemoryCheckpoint("reader", 12);
var config = new TransactionFileDatabaseConfig(PathName, "prefix.tf", 10000, writerchk, new[] {readerchk});
File.WriteAllBytes(Path.Combine(PathName, "prefix.tf0"), new byte[10000]);
var reader = new MultifileTransactionFileChaser(config, "reader");
reader.Open();
LogRecord record;
Assert.IsFalse(reader.TryReadNext(out record));
Assert.AreEqual(12, readerchk.Read());
reader.Close();
}
public void try_read_returns_false_when_writer_checksum_is_zero()
{
var writerchk = new InMemoryCheckpoint(0);
var config = new TransactionFileDatabaseConfig(PathName, "prefix.tf", 10000, writerchk, new ICheckpoint[0]);
// create db
var writer = new MultifileTransactionFileWriter(config);
writer.Open();
writer.Close();
var reader = new MultifileTransactionFileChaser(config);
reader.Open();
LogRecord record;
Assert.IsFalse(reader.TryReadNext(out record));
reader.Close();
}
public void try_read_returns_record_when_writerchecksum_ahead()
{
var writerchk = new InMemoryCheckpoint(128);
var readerchk = new InMemoryCheckpoint("reader", 0);
var config = new TransactionFileDatabaseConfig(PathName, "prefix.tf", 10000, writerchk, new[] {readerchk});
var recordToWrite = new PrepareLogRecord(logPosition: 0,
correlationId: _correlationId,
eventId: _eventId,
transactionPosition: 0,
eventStreamId: "WorldEnding",
expectedVersion: 1234,
timeStamp: new DateTime(2012, 12, 21),
flags: PrepareFlags.None,
eventType: "type",
data: new byte[] {1, 2, 3, 4, 5},
metadata: new byte[] {7, 17});
using (var fs = new FileStream(Path.Combine(PathName, "prefix.tf0"), FileMode.CreateNew, FileAccess.Write))
{
var writer = new BinaryWriter(fs);
recordToWrite.WriteWithLengthPrefixTo(writer);
fs.Close();
}
var reader = new MultifileTransactionFileChaser(config, "reader");
reader.Open();
LogRecord record = null;
var recordRead = reader.TryReadNext(out record);
reader.Close();
Assert.AreEqual(record.GetSizeWithLengthPrefix(), readerchk.Read());
Assert.IsTrue(recordRead);
Assert.AreEqual(recordToWrite, record);
}
public void try_read_returns_properly_when_writer_is_written_to_while_chasing()
{
var writerchk = new InMemoryCheckpoint(0);
var readerchk = new InMemoryCheckpoint("reader", 0);
var config = new TransactionFileDatabaseConfig(PathName, "prefix.tf", 10000, writerchk, new[] {readerchk});
var fileName = Path.Combine(PathName, "prefix.tf0");
File.Create(fileName).Close();
var reader = new MultifileTransactionFileChaser(config, "reader");
reader.Open();
LogRecord record;
Assert.IsFalse(reader.TryReadNext(out record));
var recordToWrite = new PrepareLogRecord(logPosition: 0,
correlationId: _correlationId,
eventId: _eventId,
transactionPosition: 0,
eventStreamId: "WorldEnding",
expectedVersion: 1234,
timeStamp: new DateTime(2012, 12, 21),
flags: PrepareFlags.None,
eventType: "type",
data: new byte[] { 1, 2, 3, 4, 5 },
metadata: new byte[] {7, 17});
var memstream = new MemoryStream();
var writer = new BinaryWriter(memstream);
recordToWrite.WriteWithLengthPrefixTo(writer);
using (var fs = new FileStream(fileName, FileMode.Append, FileAccess.Write, FileShare.ReadWrite))
{
fs.Write(memstream.ToArray(), 0, (int)memstream.Length);
fs.Flush(flushToDisk: true);
}
writerchk.Write(memstream.Length);
Assert.IsTrue(reader.TryReadNext(out record));
Assert.AreEqual(record, recordToWrite);
var recordToWrite2 = new PrepareLogRecord(logPosition: 0,
correlationId: _correlationId,
eventId: _eventId,
transactionPosition: 0,
eventStreamId: "WorldEnding",
expectedVersion: 4321,
timeStamp: new DateTime(2012, 12, 21),
flags: PrepareFlags.None,
eventType: "type",
data: new byte[] { 3, 2, 1 },
metadata: new byte[] {9});
memstream.SetLength(0);
recordToWrite2.WriteWithLengthPrefixTo(writer);
using (var fs = new FileStream(fileName, FileMode.Append, FileAccess.Write, FileShare.ReadWrite))
{
fs.Write(memstream.ToArray(), 0, (int) memstream.Length);
fs.Flush(flushToDisk: true);
}
writerchk.Write(writerchk.Read() + memstream.Length);
Assert.IsTrue(reader.TryReadNext(out record));
Assert.AreEqual(record, recordToWrite2);
reader.Close();
}
public void can_read_a_record_with_length_straddling_multiple_files()
{
var writerchk = new InMemoryCheckpoint(20020);
var readerchk = new InMemoryCheckpoint("reader", 9998);
var config = new TransactionFileDatabaseConfig(PathName, "prefix.tf", 10000, writerchk, new[] {readerchk});
var recordToWrite = new PrepareLogRecord(logPosition: 0,
correlationId: _correlationId,
eventId: _eventId,
transactionPosition: 0,
eventStreamId: "WorldEnding",
expectedVersion: 1234,
timeStamp: new DateTime(2012, 12, 21),
flags: PrepareFlags.None,
eventType: "type",
data: new byte[] { 1, 2, 3, 4, 5 },
metadata: new byte[] {7, 17});
var memstream = new MemoryStream();
var writer = new BinaryWriter(memstream);
recordToWrite.WriteWithLengthPrefixTo(writer);
var buf = memstream.GetBuffer();
using (var fs = new FileStream(config.FileNamingStrategy.GetFilenameFor(0), FileMode.CreateNew, FileAccess.Write))
{
fs.Seek(9998, SeekOrigin.Begin);
fs.Write(buf, 0, 2);
fs.Close();
}
using (var fs = new FileStream(config.FileNamingStrategy.GetFilenameFor(1), FileMode.CreateNew, FileAccess.Write))
{
fs.Seek(0, SeekOrigin.Begin);
fs.Write(buf, 2, recordToWrite.GetSizeWithLengthPrefix() - 2);
fs.Close();
}
var reader = new MultifileTransactionFileChaser(config, "reader");
reader.Open();
LogRecord record = null;
var readRecord = reader.TryReadNext(out record);
reader.Close();
Assert.IsTrue(readRecord);
Assert.AreEqual(recordToWrite, record);
Assert.AreEqual(9998 + recordToWrite.GetSizeWithLengthPrefix(), readerchk.Read());
}