@Override public boolean nextFrame(ByteBuffer buffer) throws HyracksDataException { int index = channelReader.findNextSender(); if (index >= 0) { IInputChannel[] channels = channelReader.getChannels(); ByteBuffer srcFrame = channels[index].getNextBuffer(); FrameUtils.copy(srcFrame, buffer); channels[index].recycleBuffer(srcFrame); return true; } return false; }