| /* |
| * |
| * * 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.eagle.alert.engine.scheme; |
| |
| import backtype.storm.spout.Scheme; |
| import backtype.storm.tuple.Fields; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import org.slf4j.Logger; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Expects flat Json scheme. |
| */ |
| public class JsonScheme implements Scheme { |
| private static final long serialVersionUID = -8352896475656975577L; |
| private static final Logger LOG = org.slf4j.LoggerFactory.getLogger(JsonScheme.class); |
| private static final ObjectMapper mapper = new ObjectMapper(); |
| |
| private String topic; |
| |
| @SuppressWarnings("rawtypes") |
| public JsonScheme(String topic, Map conf) { |
| this.topic = topic; |
| } |
| |
| @Override |
| public Fields getOutputFields() { |
| return new Fields("f1"); |
| } |
| |
| @Override |
| @SuppressWarnings("rawtypes") |
| public List<Object> deserialize(byte[] ser) { |
| try { |
| if (ser != null) { |
| Map map = mapper.readValue(ser, Map.class); |
| return Arrays.asList(topic, map); |
| } else { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Content is null, ignore"); |
| } |
| } |
| } catch (IOException e) { |
| try { |
| LOG.error("Failed to deserialize as JSON: {}", new String(ser, "UTF-8"), e); |
| } catch (Exception ex) { |
| LOG.error(ex.getMessage(), ex); |
| } |
| } |
| return null; |
| } |
| } |