| /* |
| * 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.flink; |
| |
| import java.util.List; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.support.DefaultProducer; |
| import org.apache.flink.api.java.DataSet; |
| |
| public class DataSetFlinkProducer extends DefaultProducer { |
| |
| public DataSetFlinkProducer(FlinkEndpoint endpoint) { |
| super(endpoint); |
| } |
| |
| @Override |
| public void process(Exchange exchange) throws Exception { |
| DataSet ds = resolveDataSet(exchange); |
| DataSetCallback dataSetCallback = resolveDataSetCallback(exchange); |
| Object body = exchange.getIn().getBody(); |
| |
| Object result; |
| |
| ClassLoader tccl = Thread.currentThread().getContextClassLoader(); |
| try { |
| Thread.currentThread().setContextClassLoader(DataSet.class.getClassLoader()); |
| if (body instanceof List) { |
| List list = (List) body; |
| Object[] array = list.toArray(new Object[list.size()]); |
| result = dataSetCallback.onDataSet(ds, array); |
| } else { |
| result = dataSetCallback.onDataSet(ds, body); |
| } |
| } finally { |
| Thread.currentThread().setContextClassLoader(tccl); |
| } |
| |
| collectResults(exchange, result); |
| } |
| |
| @Override |
| public FlinkEndpoint getEndpoint() { |
| return (FlinkEndpoint) super.getEndpoint(); |
| } |
| |
| protected void collectResults(Exchange exchange, Object result) throws Exception { |
| if (result instanceof DataSet) { |
| DataSet dsResults = (DataSet) result; |
| if (getEndpoint().isCollect()) { |
| exchange.getIn().setBody(dsResults.collect()); |
| } else { |
| exchange.getIn().setBody(result); |
| exchange.getIn().setHeader(FlinkConstants.FLINK_DATASET_HEADER, result); |
| } |
| } else { |
| exchange.getIn().setBody(result); |
| } |
| } |
| |
| protected DataSet resolveDataSet(Exchange exchange) { |
| if (exchange.getIn().getHeader(FlinkConstants.FLINK_DATASET_HEADER) != null) { |
| return (DataSet) exchange.getIn().getHeader(FlinkConstants.FLINK_DATASET_HEADER); |
| } else if (getEndpoint().getDataSet() != null) { |
| return getEndpoint().getDataSet(); |
| } else { |
| throw new IllegalStateException("No DataSet defined"); |
| } |
| } |
| |
| protected DataSetCallback resolveDataSetCallback(Exchange exchange) { |
| if (exchange.getIn().getHeader(FlinkConstants.FLINK_DATASET_CALLBACK_HEADER) != null) { |
| return (DataSetCallback) exchange.getIn().getHeader(FlinkConstants.FLINK_DATASET_CALLBACK_HEADER); |
| } else if (getEndpoint().getDataSetCallback() != null) { |
| return getEndpoint().getDataSetCallback(); |
| } else { |
| throw new IllegalStateException("Cannot resolve DataSet callback."); |
| } |
| } |
| } |