C# PrepareLogRecord类代码示例

 public void Setup()
 {
     _record = new PrepareLogRecord(0, _corrId, _eventId, 0, "test", 1, new DateTime(2000, 1, 1, 12, 0, 0),
                                    PrepareFlags.None, "Foo", new byte[12], new byte[15]);
     _chunk = Core.TransactionLog.Chunks.TFChunk.CreateNew(_filename, 4096, 0, 0);
     _result = _chunk.TryAppend(_record);
 }

 public void SetUp()
 {
     _writerCheckpoint = new InMemoryCheckpoint();
     _db = new TFChunkDb(new TFChunkDbConfig(PathName,
                                             new VersionedPatternFileNamingStrategy(PathName, "chunk-"),
                                             1024,
                                             0,
                                             _writerCheckpoint,
                                             new InMemoryCheckpoint(),
                                             new InMemoryCheckpoint(-1),
                                             new InMemoryCheckpoint(-1)));
     _db.Open();
     _writer = new TFChunkWriter(_db);
     _writer.Open();
     _record = new PrepareLogRecord(logPosition: 0,
                                    eventId: _eventId,
                                    correlationId: _correlationId,
                                    transactionPosition: 0xDEAD,
                                    transactionOffset: 0xBEEF,
                                    eventStreamId: "WorldEnding",
                                    expectedVersion: 1234,
                                    timeStamp: new DateTime(2012, 12, 21),
                                    flags: PrepareFlags.SingleWrite,
                                    eventType: "type",
                                    data: new byte[] { 1, 2, 3, 4, 5 },
                                    metadata: new byte[] {7, 17});
     long newPos;
     _writer.Write(_record, out newPos);
     _writer.Flush();
 }

 public void Setup()
 {
     var record = new PrepareLogRecord(15556, _corrId, _eventId, 15556, 0, "test", 1, new DateTime(2000, 1, 1, 12, 0, 0),
                                       PrepareFlags.None, "Foo", new byte[12], new byte[15]);
     _chunk = TFChunk.CreateNew(_filename, 20, 0, 0);
     _written = _chunk.TryAppend(record).Success;
 }

 public void a_record_can_be_written()
 {
     var filename = Path.Combine(PathName, "prefix.tf0");
     File.WriteAllBytes(filename, new byte[10000]);
     _checkpoint = new InMemoryCheckpoint(137);
     var tf = new MultifileTransactionFileWriter(new TransactionFileDatabaseConfig(PathName, "prefix.tf", 10000, _checkpoint, new List<ICheckpoint>()));
     tf.Open();
     var record = new PrepareLogRecord(logPosition: 0,
                                       correlationId: _correlationId,
                                       eventId: _eventId,
                                       expectedVersion: 1234,
                                       transactionPosition: 0,
                                       transactionOffset: 0,
                                       eventStreamId: "WorldEnding",
                                       timeStamp: new DateTime(2012, 12, 21),
                                       flags: PrepareFlags.None,
                                       eventType: "type",
                                       data: new byte[] { 1, 2, 3, 4, 5 },
                                       metadata: new byte[] {7, 17});
     long tmp;
     tf.Write(record, out tmp);
     tf.Flush();
     tf.Close();
     Assert.AreEqual(record.GetSizeWithLengthPrefixAndSuffix() + 137, _checkpoint.Read()); //137 is fluff assigned to beginning of checkpoint
     //TODO actually read the event
     using (var filestream = File.Open(filename, FileMode.Open, FileAccess.Read))
     {
         filestream.Seek(137 + sizeof(int), SeekOrigin.Begin);
         var reader = new BinaryReader(filestream);
         var read = LogRecord.ReadFrom(reader);
         Assert.AreEqual(record, read);
     }
 }

 public void a_record_can_be_written()
 {
     _checkpoint = new InMemoryCheckpoint(0);
     var tf = new MultifileTransactionFileWriter(
         new TransactionFileDatabaseConfig(PathName, "prefix.tf", 10000, _checkpoint, new List<ICheckpoint>()));
     tf.Open();
     var record = new PrepareLogRecord(logPosition: 0,
                                       correlationId: _correlationId,
                                       eventId: _eventId,
                                       transactionPosition: 0,
                                       transactionOffset: 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});
     long tmp;
     tf.Write(record, out tmp);
     tf.Close();
     Assert.AreEqual(record.GetSizeWithLengthPrefixAndSuffix(), _checkpoint.Read());
     using (var filestream = File.Open(Path.Combine(PathName, "prefix.tf0"), FileMode.Open, FileAccess.Read))
     {
         var reader = new BinaryReader(filestream);
         reader.ReadInt32();
         var read = LogRecord.ReadFrom(reader);
         Assert.AreEqual(record, read);
     }
 }

 public override void TestFixtureSetUp()
 {
     base.TestFixtureSetUp();
     _record = new PrepareLogRecord(0, _corrId, _eventId, 0, 0, "test", 1, new DateTime(2000, 1, 1, 12, 0, 0),
                                    PrepareFlags.None, "Foo", new byte[12], new byte[15]);
     _chunk = TFChunk.CreateNew(Filename, 4096, 0, 0, false);
     _result = _chunk.TryAppend(_record);
 }

        private CommitLogRecord WriteDeleteCommit(PrepareLogRecord prepare)
        {
            long pos;
            var commit = LogRecord.Commit(WriterChecksum.ReadNonFlushed(),
                                          prepare.CorrelationId,
                                          prepare.LogPosition,
                                          EventNumber.DeletedStream);
            Assert.IsTrue(Writer.Write(commit, out pos));

            return commit;
        }

 public void Setup()
 {
     _record = new PrepareLogRecord(0, _corrId, _eventId, 0, 0, "test", 1, new DateTime(2000, 1, 1, 12, 0, 0),
                                    PrepareFlags.None, "Foo", new byte[12], new byte[15]);
     _chunk = TFChunk.CreateNew(_filename, 4096, 0, 0);
     _result = _chunk.TryAppend(_record);
     _chunk.Flush();
     _chunk.Complete();
     _cachedChunk = TFChunk.FromCompletedFile(_filename, verifyHash: true);
     _cachedChunk.CacheInMemory();
 }

 public StreamEventAppeared(int eventNumber, PrepareLogRecord prepareLogRecord, long commitPosition)
 {
     EventStreamId = prepareLogRecord.EventStreamId;
     EventNumber = eventNumber;
     EventId = prepareLogRecord.EventId.ToByteArray();
     EventType = prepareLogRecord.EventType;
     Data = prepareLogRecord.Data;
     Metadata = prepareLogRecord.Metadata;
     PreparePosition = prepareLogRecord.LogPosition;
     CommitPosition = commitPosition;
 }

 public void a_record_can_be_written()
 {
     var filename = Path.Combine(PathName, "prefix.tf0");
     var secondfilename = Path.Combine(PathName, "prefix.tf1");
     var thirdfilename = Path.Combine(PathName, "prefix.tf2");
     File.WriteAllBytes(filename, new byte[50]);
     _checkpoint = new InMemoryCheckpoint(40);
     var tf = new MultifileTransactionFileWriter(
         new TransactionFileDatabaseConfig(PathName, "prefix.tf", 50, _checkpoint, new ICheckpoint[0]));
     tf.Open();
     var record = new PrepareLogRecord(logPosition: 0,
                                       correlationId: _correlationId,
                                       eventId: _eventId,
                                       transactionPosition: 0,
                                       transactionOffset: 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});
     long tmp;
     tf.Write(record, out tmp);
     tf.Close();
     Assert.AreEqual(record.GetSizeWithLengthPrefixAndSuffix() + 40, _checkpoint.Read()); //+orginal checkpoint position
     Assert.IsTrue(File.Exists(secondfilename));
     var stream = new MemoryStream();
     var buffer = new byte[256];
     using (var filestream = File.Open(filename, FileMode.Open, FileAccess.Read))
     {
         filestream.Seek(40, SeekOrigin.Begin);
         filestream.Read(buffer, 0, 10);
         stream.Write(buffer, 0, 10);
     }
     using (var filestream = File.Open(secondfilename, FileMode.Open, FileAccess.Read))
     {
         filestream.Seek(0, SeekOrigin.Begin);
         filestream.Read(buffer, 0, 50);
         stream.Write(buffer, 0, 50);
     }
     using (var filestream = File.Open(thirdfilename, FileMode.Open, FileAccess.Read))
     {
         filestream.Seek(0, SeekOrigin.Begin);
         filestream.Read(buffer, 0, 50);
         stream.Write(buffer, 0, 50);
     }
     stream.Seek(0 + sizeof(int), SeekOrigin.Begin);
     var reader = new BinaryReader(stream);
     var read = LogRecord.ReadFrom(reader);
     Assert.AreEqual(record, read);
 }

 public override void TestFixtureSetUp()
 {
     base.TestFixtureSetUp();
     _record = new PrepareLogRecord(0, _corrId, _eventId, 0, 0, "test", 1, new DateTime(2000, 1, 1, 12, 0, 0),
                                    PrepareFlags.None, "Foo", new byte[12], new byte[15]);
     _chunk = TFChunk.CreateNew(Filename, 4096, 0, false);
     _result = _chunk.TryAppend(_record);
     _chunk.Flush();
     _chunk.Complete();
     _uncachedChunk = TFChunk.FromCompletedFile(Filename, verifyHash: true);
     _uncachedChunk.CacheInMemory();
     _uncachedChunk.UnCacheFromMemory();
 }

        public void a_record_can_be_written()
        {
            var filename = Path.Combine(PathName, "prefix.tf0");
            var chunkHeader = new ChunkHeader(1, 10000, 0, 0, 0);
            var chunkBytes = chunkHeader.AsByteArray();
            var buf = new byte[ChunkHeader.Size + ChunkFooter.Size + chunkHeader.ChunkSize];
            Buffer.BlockCopy(chunkBytes, 0, buf, 0, chunkBytes.Length);
            File.WriteAllBytes(filename, buf);

            _checkpoint = new InMemoryCheckpoint(137);
            var db = new TFChunkDb(new TFChunkDbConfig(PathName,
                                                       new PrefixFileNamingStrategy(PathName, "prefix.tf"),
                                                       chunkHeader.ChunkSize,
                                                       0,
                                                       _checkpoint,
                                                       new ICheckpoint[0]));
            db.OpenVerifyAndClean();

            var writer = new TFChunkWriter(db);
            var record = 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[8000],
                                              metadata: new byte[] { 7, 17 });

            Console.WriteLine(record.GetSizeWithLengthPrefix());
            Console.WriteLine(record.GetSizeWithLengthPrefix() + 137);

            long pos;
            Assert.IsTrue(writer.Write(record, out pos));
            writer.Close();
            db.Dispose();

            Assert.AreEqual(record.GetSizeWithLengthPrefix() + 137, _checkpoint.Read());
            using (var filestream = File.Open(filename, FileMode.Open, FileAccess.Read))
            {
                filestream.Seek(ChunkHeader.Size + 137 + sizeof(int), SeekOrigin.Begin);
                var reader = new BinaryReader(filestream);
                var read = LogRecord.ReadFrom(reader);

                Console.WriteLine(string.Join("\n", Directory.EnumerateFiles(PathName)));

                Assert.AreEqual(record, read);
            }
        }

        public void a_record_can_be_written()
        {
            var filename = GetFilePathFor("chunk-000000.000000");
            var chunkHeader = new ChunkHeader(TFChunk.CurrentChunkVersion, 10000, 0, 0, false, Guid.NewGuid());
            var chunkBytes = chunkHeader.AsByteArray();
            var buf = new byte[ChunkHeader.Size + ChunkFooter.Size + chunkHeader.ChunkSize];
            Buffer.BlockCopy(chunkBytes, 0, buf, 0, chunkBytes.Length);
            File.WriteAllBytes(filename, buf);

            _checkpoint = new InMemoryCheckpoint(137);
            var db = new TFChunkDb(new TFChunkDbConfig(PathName,
                                                       new VersionedPatternFileNamingStrategy(PathName, "chunk-"),
                                                       chunkHeader.ChunkSize,
                                                       0,
                                                       _checkpoint,
                                                       new InMemoryCheckpoint(),
                                                       new InMemoryCheckpoint(-1),
                                                       new InMemoryCheckpoint(-1)));
            db.Open();

            var bytes = new byte[3994]; // this gives exactly 4097 size of record, with 3993 (rec size 4096) everything works fine!
            new Random().NextBytes(bytes);
            var writer = new TFChunkWriter(db);
            var record = new PrepareLogRecord(logPosition: 137,
                                              correlationId: _correlationId,
                                              eventId: _eventId,
                                              transactionPosition: 789,
                                              transactionOffset: 543,
                                              eventStreamId: "WorldEnding",
                                              expectedVersion: 1234,
                                              timeStamp: new DateTime(2012, 12, 21),
                                              flags: PrepareFlags.SingleWrite,
                                              eventType: "type",
                                              data: bytes, 
                                              metadata: new byte[] { 0x07, 0x17 });

            long pos;
            Assert.IsTrue(writer.Write(record, out pos));
            writer.Close();
            db.Dispose();

            Assert.AreEqual(record.GetSizeWithLengthPrefixAndSuffix() + 137, _checkpoint.Read());
            using (var filestream = File.Open(filename, FileMode.Open, FileAccess.Read))
            {
                filestream.Seek(ChunkHeader.Size + 137 + sizeof(int), SeekOrigin.Begin);
                var reader = new BinaryReader(filestream);
                var read = LogRecord.ReadFrom(reader);
                Assert.AreEqual(record, read);
            }
        }

        public void try_read_returns_record_when_writerchecksum_ahead()
        {
            var recordToWrite = new PrepareLogRecord(logPosition: 0,
                                                     correlationId: _correlationId,
                                                     eventId: _eventId,
                                                     transactionPosition: 0,
                                                     transactionOffset: 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(GetFilePathFor("chunk-000000.000000"), FileMode.CreateNew, FileAccess.Write))
            {
                fs.SetLength(ChunkHeader.Size + ChunkFooter.Size + 10000);
                var chunkHeader = new ChunkHeader(TFChunk.CurrentChunkVersion, 10000, 0, 0, false, Guid.NewGuid()).AsByteArray();
                var writer = new BinaryWriter(fs);
                writer.Write(chunkHeader);
                recordToWrite.WriteWithLengthPrefixAndSuffixTo(writer);
                fs.Close();
            }
            
            var writerchk = new InMemoryCheckpoint(128);
            var chaserchk = new InMemoryCheckpoint(Checkpoint.Chaser, 0);
            var db = new TFChunkDb(new TFChunkDbConfig(PathName,
                                                       new VersionedPatternFileNamingStrategy(PathName, "chunk-"),
                                                       10000,
                                                       0,
                                                       writerchk,
                                                       chaserchk,
                                                       new InMemoryCheckpoint(-1),
                                                       new InMemoryCheckpoint(-1)));
            db.Open();

            var chaser = new TFChunkChaser(db, writerchk, chaserchk);
            chaser.Open();

            LogRecord record;
            var recordRead = chaser.TryReadNext(out record);
            chaser.Close();

            Assert.AreEqual(record.GetSizeWithLengthPrefixAndSuffix(), chaserchk.Read());
            Assert.IsTrue(recordRead);
            Assert.AreEqual(recordToWrite, record);

            db.Close();
        }

        protected override void WriteTestScenario()
        {
            _id1 = Guid.NewGuid();
            _id2 = Guid.NewGuid();

            long pos1, pos2, pos3, pos4;
            _prepare1 = new PrepareLogRecord(0, _id1, _id1, 0, 0, "test1", ExpectedVersion.NoStream, DateTime.UtcNow,
                                             PrepareFlags.SingleWrite, "type", new byte[0], new byte[0]);
            Writer.Write(_prepare1, out pos1);
            _prepare2 = new PrepareLogRecord(pos1, _id2, _id2, pos1, 0, "test1", 0, DateTime.UtcNow,
                                             PrepareFlags.SingleWrite, "type", new byte[0], new byte[0]);
            Writer.Write(_prepare2, out pos2);
            Writer.Write(new CommitLogRecord(pos2, _id1, 0, DateTime.UtcNow, 0), out pos3);
            Writer.Write(new CommitLogRecord(pos3, _id2, pos1, DateTime.UtcNow, 1), out pos4);
        }