@Override
public FileWriteTaskResult call() throws FileNotFoundException, IOException {
FileChannel openedChannel;
if (channel == null) {
openedChannel = openChannel(file);
} else {
openedChannel = channel;
}
buffer.flipFloats();
openedChannel.write(buffer.asByteBuffer());
buffer.clear();
FileWriteTaskResult result = new FileWriteTaskResult(openedChannel, buffer);
return result;
}
/**
* Stops writing and starts to close the output file.
*
* <p>Note: this function is non-blocking and can be called from within the process tread.
*/
public WriterResult stop() {
synchronized (processingLock) {
if (!started) {
throw new RuntimeException("Attempt to stop altough not started.");
}
startBuffer.flipFloats();
Future<FileChannel> readerChannel = null;
FileChannel channel = null;
if (startBufferDone) {
// wait for the bussyBufferProvider to terminate streaming.
// ToDo: this ought to be done inside LastFileWriteTask (beware of possible deadlocks)
if (bussyBufferProvider != null) {
if (!bussyBufferProvider.isDone()) {
logger.warning("Waiting for a previous buffer to be streamed.");
overflowCount++;
}
try {
channel = bussyBufferProvider.get().getChannel();
} catch (InterruptedException | ExecutionException ex) {
logger.log(Level.SEVERE, null, ex);
}
}
FileWriteTaskResult result = null;
try {
result = currentBufferProvider.get();
} catch (InterruptedException | ExecutionException ex) {
logger.log(Level.SEVERE, null, ex);
}
if (result != null) {
SyncBuffer buffer = result.getbuffer();
LastFileWriteTask lastFileWriteTask = new LastFileWriteTask(outputFile, channel, buffer);
readerChannel = executor.submit(lastFileWriteTask);
}
}
WriterResult result = new WriterResult(startBuffer, readerChannel, samplesProcessed);
currentBufferProvider = null;
bussyBufferProvider = null;
startBuffer = null;
started = false;
return result;
}
}