| package com.yahoo.labs.samoa.topology; |
| |
| /* |
| * #%L |
| * SAMOA |
| * %% |
| * Copyright (C) 2013 Yahoo! Inc. |
| * %% |
| * Licensed 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. |
| * #L% |
| */ |
| |
| /** |
| * Processing item interface. |
| * |
| * @author severien |
| * |
| */ |
| public interface ProcessingItem extends IProcessingItem { |
| |
| /** |
| * Connects this processing item in a round robin fashion. The events will be distributed evenly between the |
| * instantiated processing items. |
| * |
| * @param inputStream |
| * Stream to connect this processing item. |
| * @return ProcessingItem |
| */ |
| public ProcessingItem connectInputShuffleStream(Stream inputStream); |
| |
| /** |
| * Connects this processing item taking the event key into account. Events will be routed to the processing item |
| * according to the modulus of its key and the paralellism level. Ex.: key = 5 and paralellism = 2, 5 mod 2 = 1. |
| * Processing item responsible for 1 will receive this event. |
| * |
| * @param inputStream |
| * Stream to connect this processing item. |
| * @return ProcessingItem |
| */ |
| public ProcessingItem connectInputKeyStream(Stream inputStream); |
| |
| /** |
| * Connects this processing item to the stream in a broadcast fashion. All processing items of this type will receive |
| * copy of the original event. |
| * |
| * @param inputStream |
| * Stream to connect this processing item. |
| * @return ProcessingItem |
| */ |
| public ProcessingItem connectInputAllStream(Stream inputStream); |
| |
| /** |
| * Gets processing item parallelism level. |
| * |
| * @return int |
| */ |
| public int getParallelism(); |
| } |