| /** |
| * 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.storm.topology; |
| |
| import java.io.Serializable; |
| import java.util.Map; |
| |
| /** |
| * Common methods for all possible components in a topology. This interface is used when defining topologies using the Java API. |
| */ |
| public interface IComponent extends Serializable { |
| |
| /** |
| * Declare the output schema for all the streams of this topology. |
| * |
| * @param declarer this is used to declare output stream ids, output fields, and whether or not each output stream is a direct stream |
| */ |
| void declareOutputFields(OutputFieldsDeclarer declarer); |
| |
| /** |
| * Declare configuration specific to this component. Only a subset of the "topology.*" configs can be overridden. The component |
| * configuration can be further overridden when constructing the topology using {@link TopologyBuilder} |
| */ |
| Map<String, Object> getComponentConfiguration(); |
| |
| } |