/*
* 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.flink.streaming.connectors.nifi.examples;

import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.source.SourceFunction;
import org.apache.flink.streaming.connectors.nifi.NiFiDataPacket;
import org.apache.flink.streaming.connectors.nifi.NiFiSource;
import org.apache.nifi.remote.client.SiteToSiteClient;
import org.apache.nifi.remote.client.SiteToSiteClientConfig;

import java.nio.charset.Charset;

/**
 * An example topology that pulls data from a NiFi output port named "Data for Flink".
 */
public class NiFiSourceTopologyExample {

	public static void main(String[] args) throws Exception {
		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

		SiteToSiteClientConfig clientConfig = new SiteToSiteClient.Builder()
				.url("http://localhost:8080/nifi")
				.portName("Data for Flink")
				.requestBatchCount(5)
				.buildConfig();

		SourceFunction<NiFiDataPacket> nifiSource = new NiFiSource(clientConfig);
		DataStream<NiFiDataPacket> streamSource = env.addSource(nifiSource).setParallelism(2);

		DataStream<String> dataStream = streamSource.map(new MapFunction<NiFiDataPacket, String>() {
			@Override
			public String map(NiFiDataPacket value) throws Exception {
				return new String(value.getContent(), Charset.defaultCharset());
			}
		});

		dataStream.print();
		env.execute();
	}

}