@VisibleForTesting
List<String> processMessage(String message) {
// Split leaves a trailing empty line if there's a terminating newline.
ArrayList<String> split = Lists.newArrayList(message.split("\r?\n", -1));
Preconditions.checkArgument(split.size() > 0);
synchronized (this) {
buffer.append(split.get(0));
if (split.size() == 1) // no newlines.
return ImmutableList.of();
split.set(0, buffer.toString());
buffer = new StringBuilder().append(split.remove(split.size() - 1));
}
return split;
}
