/**
* Log a series of writes. These writes are committed "atomically". Since all writes in the log
* are serialized, we just need to make sure that all these writes are contiguous.
*
* @param ops Set of write operations
*/
public void put(final WriteBatch ops) {
// Lock the log so that we can commit several at a time.
synchronized (this) {
Iterator<TableKey> iter = ops.iterator();
while (iter.hasNext()) {
TableKey key = iter.next();
for (WriteBatch.TableWrite write : ops.getValues(key)) {
ByteBuffer data = serialize(key, write.value, write.options);
if (logBuffer.remaining() < data.position()) {
logBuffer = mapWAL();
}
data.flip();
logBuffer.put(data);
}
}
}
}
private WriteBatch enqueue(WriteCommand writeRecord) throws IOException {
WriteBatch currentBatch = null;
int spinnings = 0;
int limit = 100;
while (true) {
if (shutdown) {
throw new IOException("DataFileAppender Writer Thread Shutdown!");
}
if (firstAsyncException.get() != null) {
throw new IOException(firstAsyncException.get());
}
try {
if (batching.compareAndSet(false, true) && !shutdown) {
if (nextWriteBatch == null) {
DataFile file = journal.getCurrentWriteFile();
boolean canBatch = false;
currentBatch = new WriteBatch(file, file.getLength(), writeRecord);
canBatch = currentBatch.canBatch(writeRecord);
if (!canBatch) {
file = journal.rotateWriteFile();
currentBatch = new WriteBatch(file, file.getLength(), writeRecord);
}
WriteCommand controlRecord = new WriteCommand(new Location(), null, false);
currentBatch.doFirstBatch(controlRecord, writeRecord);
if (!writeRecord.sync) {
inflightWrites.put(controlRecord.location, controlRecord);
inflightWrites.put(writeRecord.location, writeRecord);
nextWriteBatch = currentBatch;
batching.set(false);
} else {
batchQueue.put(currentBatch);
batching.set(false);
}
break;
} else {
boolean canBatch = nextWriteBatch.canBatch(writeRecord);
if (canBatch && !writeRecord.sync) {
nextWriteBatch.doAppendBatch(writeRecord);
inflightWrites.put(writeRecord.location, writeRecord);
currentBatch = nextWriteBatch;
batching.set(false);
break;
} else if (canBatch && writeRecord.sync) {
nextWriteBatch.doAppendBatch(writeRecord);
batchQueue.put(nextWriteBatch);
currentBatch = nextWriteBatch;
nextWriteBatch = null;
batching.set(false);
break;
} else {
batchQueue.put(nextWriteBatch);
nextWriteBatch = null;
batching.set(false);
}
}
} else {
// Spin waiting for new batch ...
if (spinnings <= limit) {
spinnings++;
continue;
} else {
Thread.sleep(250);
continue;
}
}
} catch (InterruptedException ex) {
throw new IllegalStateException(ex.getMessage(), ex);
}
}
return currentBatch;
}