| /* |
| * 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.camel.component.spark; |
| |
| import java.util.List; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.support.DefaultProducer; |
| import org.apache.spark.api.java.JavaRDD; |
| import org.apache.spark.sql.Dataset; |
| import org.apache.spark.sql.Row; |
| |
| import static org.apache.camel.component.spark.SparkConstants.SPARK_DATAFRAME_CALLBACK_HEADER; |
| import static org.apache.camel.component.spark.SparkConstants.SPARK_DATAFRAME_HEADER; |
| import static org.apache.camel.component.spark.SparkConstants.SPARK_RDD_HEADER; |
| |
| public class DataFrameSparkProducer extends DefaultProducer { |
| |
| public DataFrameSparkProducer(SparkEndpoint endpoint) { |
| super(endpoint); |
| } |
| |
| @Override |
| public void process(Exchange exchange) throws Exception { |
| Dataset<Row> dataFrame = resolveDataFrame(exchange); |
| DataFrameCallback dataFrameCallback = resolveDataFrameCallback(exchange); |
| Object body = exchange.getIn().getBody(); |
| Object result = body instanceof List ? dataFrameCallback.onDataFrame(dataFrame, ((List) body).toArray(new Object[0])) : dataFrameCallback.onDataFrame(dataFrame, body); |
| collectResults(exchange, result); |
| } |
| |
| @Override |
| public SparkEndpoint getEndpoint() { |
| return (SparkEndpoint) super.getEndpoint(); |
| } |
| |
| // Helpers |
| |
| protected void collectResults(Exchange exchange, Object result) { |
| if (result instanceof JavaRDD) { |
| JavaRDD rddResults = (JavaRDD) result; |
| if (getEndpoint().isCollect()) { |
| exchange.getIn().setBody(rddResults.collect()); |
| } else { |
| exchange.getIn().setBody(result); |
| exchange.getIn().setHeader(SPARK_RDD_HEADER, result); |
| } |
| } else { |
| exchange.getIn().setBody(result); |
| } |
| } |
| |
| protected Dataset<Row> resolveDataFrame(Exchange exchange) { |
| if (exchange.getIn().getHeader(SPARK_DATAFRAME_HEADER) != null) { |
| return (Dataset<Row>) exchange.getIn().getHeader(SPARK_DATAFRAME_HEADER); |
| } else if (getEndpoint().getDataFrame() != null) { |
| return getEndpoint().getDataFrame(); |
| } else { |
| throw new IllegalStateException("No Data Frame defined."); |
| } |
| } |
| |
| protected DataFrameCallback resolveDataFrameCallback(Exchange exchange) { |
| if (exchange.getIn().getHeader(SPARK_DATAFRAME_CALLBACK_HEADER) != null) { |
| return (DataFrameCallback) exchange.getIn().getHeader(SPARK_DATAFRAME_CALLBACK_HEADER); |
| } else if (getEndpoint().getDataFrameCallback() != null) { |
| return getEndpoint().getDataFrameCallback(); |
| } else { |
| throw new IllegalStateException("Cannot resolve Data Frame."); |
| } |
| } |
| |
| } |