| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.samza.system; |
| |
| /** |
| * The type of the intermediate stream message. The enum will be encoded using its ordinal value and |
| * put in the first byte of the serialization of intermediate message. |
| */ |
| public enum MessageType { |
| USER_MESSAGE, |
| WATERMARK, |
| END_OF_STREAM; |
| |
| /** |
| * Returns the {@link MessageType} of a particular intermediate stream message. |
| * @param message an intermediate stream message |
| * @return type of the message |
| */ |
| public static MessageType of(Object message) { |
| if (message instanceof WatermarkMessage) { |
| return WATERMARK; |
| } else if (message instanceof EndOfStreamMessage) { |
| return END_OF_STREAM; |
| } else { |
| return USER_MESSAGE; |
| } |
| } |
| } |