| /** |
| * 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.s4.example.twitter; |
| |
| import java.net.ServerSocket; |
| |
| import org.apache.s4.base.Event; |
| import org.apache.s4.core.App; |
| import org.apache.s4.core.ProcessingElement; |
| import org.apache.s4.core.Streamable; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.base.Splitter; |
| |
| public class TopicExtractorPE extends ProcessingElement { |
| |
| static private ServerSocket serverSocket; |
| Streamable<Event> downStream; |
| static Logger logger = LoggerFactory.getLogger(TopicExtractorPE.class); |
| |
| public TopicExtractorPE(App app) { |
| super(app); |
| // TODO Auto-generated constructor stub |
| } |
| |
| @Override |
| protected void onCreate() { |
| |
| } |
| |
| public void setDownStream(Streamable<Event> stream) { |
| this.downStream = stream; |
| } |
| |
| public void onEvent(Event event) { |
| String text = event.get("statusText", String.class); |
| logger.trace("event text [{}]", text); |
| if (!text.contains("#")) { |
| return; |
| } |
| Iterable<String> split = Splitter.on(' ').omitEmptyStrings().trimResults().split(text); |
| for (String topic : split) { |
| if (!topic.startsWith("#")) { |
| continue; |
| } |
| String topicOnly = topic.substring(1); |
| if (topicOnly.length() == 0 || topicOnly.contains("#")) { |
| continue; |
| } |
| downStream.put(new TopicEvent(topicOnly, 1)); |
| } |
| } |
| |
| @Override |
| protected void onRemove() { |
| // TODO Auto-generated method stub |
| |
| } |
| |
| } |