/**
* Add a Mutation to the commit log.
*
* @param mutation the Mutation to add to the log
*/
public ReplayPosition add(Mutation mutation) {
assert mutation != null;
long size = Mutation.serializer.serializedSize(mutation, MessagingService.current_version);
long totalSize = size + ENTRY_OVERHEAD_SIZE;
if (totalSize > MAX_MUTATION_SIZE) {
throw new IllegalArgumentException(
String.format(
"Mutation of %s bytes is too large for the maxiumum size of %s",
totalSize, MAX_MUTATION_SIZE));
}
Allocation alloc = allocator.allocate(mutation, (int) totalSize);
ICRC32 checksum = CRC32Factory.instance.create();
final ByteBuffer buffer = alloc.getBuffer();
try (BufferedDataOutputStreamPlus dos = new DataOutputBufferFixed(buffer)) {
// checksummed length
dos.writeInt((int) size);
checksum.update(buffer, buffer.position() - 4, 4);
buffer.putInt(checksum.getCrc());
int start = buffer.position();
// checksummed mutation
Mutation.serializer.serialize(mutation, dos, MessagingService.current_version);
checksum.update(buffer, start, (int) size);
buffer.putInt(checksum.getCrc());
} catch (IOException e) {
throw new FSWriteError(e, alloc.getSegment().getPath());
} finally {
alloc.markWritten();
}
executor.finishWriteFor(alloc);
return alloc.getReplayPosition();
}
