/* * 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 * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * 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.flink.streaming.siddhi.operator; import org.apache.flink.api.common.typeinfo.TypeInformation; import org.apache.flink.api.java.tuple.Tuple; import org.apache.flink.api.java.typeutils.PojoTypeInfo; import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.DeserializationFeature; import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper; import org.apache.flink.streaming.siddhi.utils.SiddhiTupleFactory; import org.apache.flink.streaming.api.operators.Output; import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.wso2.siddhi.core.event.Event; import org.wso2.siddhi.core.stream.output.StreamCallback; import org.wso2.siddhi.query.api.definition.AbstractDefinition; import java.util.LinkedHashMap; import java.util.Map; /** * Siddhi Stream output callback handler and conver siddhi {@link Event} to required output type, * according to output {@link TypeInformation} and siddhi schema {@link AbstractDefinition} */ public class StreamOutputHandler<R> extends StreamCallback { private static final Logger LOGGER = LoggerFactory.getLogger(StreamOutputHandler.class); private final AbstractDefinition definition; private final Output<StreamRecord<R>> output; private final TypeInformation<R> typeInfo; private final ObjectMapper objectMapper; public StreamOutputHandler(TypeInformation<R> typeInfo, AbstractDefinition definition, Output<StreamRecord<R>> output) { this.typeInfo = typeInfo; this.definition = definition; this.output = output; this.objectMapper = new ObjectMapper(); this.objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); } @Override public void receive(Event[] events) { StreamRecord<R> reusableRecord = new StreamRecord<>(null, 0L); for (Event event : events) { if (typeInfo == null || Map.class.isAssignableFrom(typeInfo.getTypeClass())) { reusableRecord.replace(toMap(event), event.getTimestamp()); output.collect(reusableRecord); } else if (typeInfo.isTupleType()) { Tuple tuple = this.toTuple(event); reusableRecord.replace(tuple, event.getTimestamp()); output.collect(reusableRecord); } else if (typeInfo instanceof PojoTypeInfo) { R obj; try { obj = objectMapper.convertValue(toMap(event), typeInfo.getTypeClass()); } catch (IllegalArgumentException ex) { LOGGER.error("Failed to map event: " + event + " into type: " + typeInfo, ex); throw ex; } reusableRecord.replace(obj, event.getTimestamp()); output.collect(reusableRecord); } else { throw new IllegalArgumentException("Unable to format " + event + " as type " + typeInfo); } } } @Override public synchronized void stopProcessing() { super.stopProcessing(); } private Map<String, Object> toMap(Event event) { Map<String, Object> map = new LinkedHashMap<>(); for (int i = 0; i < definition.getAttributeNameArray().length; i++) { map.put(definition.getAttributeNameArray()[i], event.getData(i)); } return map; } private <T extends Tuple> T toTuple(Event event) { return SiddhiTupleFactory.newTuple(event.getData()); } }