/**
* Attempt to write the file, delete the backup and return true as atomically as possible. If any
* exception occurs, delete the new file; next time we will restore from the backup.
*
* @param key table key
* @param objectEntity table instance
* @param originalFile file to write new data
* @param backupFile backup file to be used if write is failed
*/
private <E> void writeTableFile(
String key, ObjectEntity<E> objectEntity, File originalFile, File backupFile) {
try {
FileOutputStream fileStream = new FileOutputStream(originalFile);
final Output kryoOutput = new Output(fileStream);
getKryo().writeObject(kryoOutput, objectEntity);
kryoOutput.flush();
fileStream.flush();
sync(fileStream);
kryoOutput.close(); // also close file stream
// Writing was successful, delete the backup file if there is one.
//noinspection ResultOfMethodCallIgnored
backupFile.delete();
} catch (IOException | KryoException e) {
// Clean up an unsuccessfully written file
if (originalFile.exists()) {
if (!originalFile.delete()) {
throw new PaperDbException("Couldn't clean up partially-written file " + originalFile, e);
}
}
throw new PaperDbException(
"Couldn't save table: "
+ key
+ ". "
+ "Backed up table will be used on next read attempt",
e);
}
}
public void testFlushRoundTrip() throws Exception {
Kryo kryo = new Kryo();
String s1 = "12345";
ByteArrayOutputStream os = new ByteArrayOutputStream();
ObjectOutputStream objOutput = new ObjectOutputStream(os);
Output output = new Output(objOutput);
kryo.writeClass(output, s1.getClass());
kryo.writeObject(output, s1);
output.flush();
// objOutput.flush(); // this layer wasn't flushed prior to this bugfix, add it for a
// workaround
byte[] b = os.toByteArray();
System.out.println("size: " + b.length);
ByteArrayInputStream in = new ByteArrayInputStream(b);
ObjectInputStream objIn = new ObjectInputStream(in);
Input input = new Input(objIn);
Registration r = kryo.readClass(input);
String s2 = kryo.readObject(input, r.getType());
assertEquals(s1, s2);
}
@Override
public byte[] encode(Object obj) {
Output output = null;
output = new Output(1, 4096);
kryo.writeObject(output, obj);
byte[] data = output.toBytes();
output.flush();
return data;
}
@Override
public CachedData encode(final Object obj) {
final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
try (final Output output = new Output(byteStream)) {
kryo.writeClassAndObject(output, obj);
output.flush();
final byte[] bytes = byteStream.toByteArray();
return new CachedData(0, bytes, bytes.length);
}
}
// Required by Kryo serialization.
public void write(Kryo kryo, Output out) {
kryo.writeObject(out, intVal);
kryo.writeObject(out, floatVal);
kryo.writeObject(out, shortVal);
kryo.writeObject(out, byteArr);
kryo.writeObject(out, longArr);
kryo.writeObject(out, dblArr);
kryo.writeObject(out, str);
out.flush();
}
public void write(Kryo kryo, Output output, Object object) {
Deflater deflater = new Deflater(compressionLevel, noHeaders);
OutputChunked outputChunked = new OutputChunked(output, 256);
DeflaterOutputStream deflaterStream = new DeflaterOutputStream(outputChunked, deflater);
Output deflaterOutput = new Output(deflaterStream, 256);
kryo.writeObject(deflaterOutput, object, serializer);
deflaterOutput.flush();
try {
deflaterStream.finish();
} catch (IOException ex) {
throw new KryoException(ex);
}
outputChunked.endChunks();
}
public void testSmallBuffers() throws Exception {
ByteBuffer buf = ByteBuffer.allocate(1024);
ByteBufferOutputStream byteBufferOutputStream = new ByteBufferOutputStream(buf);
Output testOutput = new Output(byteBufferOutputStream);
testOutput.writeBytes(new byte[512]);
testOutput.writeBytes(new byte[512]);
testOutput.flush();
ByteBufferInputStream testInputs = new ByteBufferInputStream();
buf.flip();
testInputs.setByteBuffer(buf);
Input input = new Input(testInputs, 512);
byte[] toRead = new byte[512];
input.readBytes(toRead);
input.readBytes(toRead);
}
public void testOutputStream() throws IOException {
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
Output output = new Output(buffer, 2);
output.writeBytes(new byte[] {11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26});
output.writeBytes(new byte[] {31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46});
output.writeBytes(new byte[] {51, 52, 53, 54, 55, 56, 57, 58});
output.writeBytes(new byte[] {61, 62, 63, 64, 65});
output.flush();
assertEquals(
new byte[] { //
11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, //
31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, //
51, 52, 53, 54, 55, 56, 57, 58, //
61, 62, 63, 64, 65
},
buffer.toByteArray());
}
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
public void write(Connection connection, OutputStream outputStream, Object object) {
Output output = new Output(outputStream);
IKryoProvider kryoProvider = serializerQueue.poll();
// if nothing is available in queue don't wait, create new one
if (null == kryoProvider) {
kryoProvider = createKryoProvider();
}
try {
Kryo kryo = kryoProvider.getKryo();
kryo.getContext().put("connection", connection);
kryo.writeClassAndObject(output, object);
output.flush();
} finally {
serializerQueue.offer(kryoProvider);
}
}
@Test
@Parameters(method = "parameters")
public void inputAndOutputAreSame(Gender gender, Range range) {
Seeking inputElement = new Seeking(gender, range);
Kryo kryo = new Kryo();
kryo.register(Range.class, new RangeSerializer());
SeekingSerializer serializer = new SeekingSerializer();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
Output output = new Output(outputStream);
serializer.write(kryo, output, inputElement);
output.flush();
Input input = new Input(new ByteArrayInputStream(outputStream.toByteArray()));
Seeking outputElement = serializer.read(kryo, input, Seeking.class);
Assert.assertEquals(inputElement.getAgeRange(), outputElement.getAgeRange());
Assert.assertEquals(inputElement.getGender(), outputElement.getGender());
}
public void testWriteBytes() throws IOException {
Output buffer = new Output(512);
buffer.writeBytes(new byte[] {11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26});
buffer.writeBytes(new byte[] {31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46});
buffer.writeByte(51);
buffer.writeBytes(new byte[] {52, 53, 54, 55, 56, 57, 58});
buffer.writeByte(61);
buffer.writeByte(62);
buffer.writeByte(63);
buffer.writeByte(64);
buffer.writeByte(65);
buffer.flush();
assertEquals(
new byte[] { //
11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, //
31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, //
51, 52, 53, 54, 55, 56, 57, 58, //
61, 62, 63, 64, 65
},
buffer.toBytes());
}
public void flush() {
output.flush();
}
