private byte[] writePartialFile(DataOutputStream out) throws IOException { MessageQueue.Message m1 = MessageQueue.Message.newBuilder() .setTime(1) .setPayload(ByteString.copyFromUtf8("test 1")) .build(); out.writeInt(m1.getSerializedSize()); m1.writeTo(out); MessageQueue.Message m2 = MessageQueue.Message.newBuilder() .setTime(2) .setPayload(ByteString.copyFromUtf8("test 2")) .build(); out.writeInt(m2.getSerializedSize()); m2.writeTo(out); MessageQueue.Message m3 = MessageQueue.Message.newBuilder() .setTime(3) .setPayload(ByteString.copyFromUtf8("test 3")) .build(); byte[] bytes = m3.toByteArray(); out.writeInt(bytes.length); out.write(bytes, 0, 6); out.flush(); return bytes; }