| /* |
| * 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.task; |
| |
| import org.apache.samza.system.OutgoingMessageEnvelope; |
| |
| /** |
| * Used as an interface for the means of sending message envelopes to an output stream. |
| * |
| * <p>A MessageCollector is provided on every call to {@link StreamTask#process} and |
| * {@link WindowableTask#window}. You must use those MessageCollector objects only within |
| * those method calls, and not hold on to a reference for use at any other time. |
| */ |
| public interface MessageCollector { |
| /** |
| * Sends message envelope out onto specified stream. |
| * @param envelope Self contained envelope containing message, key and specified stream to be sent to. |
| */ |
| void send(OutgoingMessageEnvelope envelope); |
| } |