public void addRawPart(byte[] newPart, boolean isObject) {
    messageModified = true;
    Part part = partsList[currentPart];
    part.setPartState(newPart, isObject);
    currentPart++;
  }
Adds a new part to this message that may contain a serialized object.
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/Message.java