UdfContextFrontend.java example

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spork-streaming-master
/*
 * 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
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 */
package org.apache.pig.test.udf.evalfunc;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.pig.EvalFunc;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.util.UDFContext;

public class UdfContextFrontend extends EvalFunc<Boolean> {
	
	public UdfContextFrontend(){}
	
	public UdfContextFrontend(String param){
		checkJobConf(); // call here and it will execute multiple times in front end
	}
	
	private void checkJobConf() {
		Configuration jobConf = UDFContext.getUDFContext().getJobConf();
		System.out.println("checkJobConf: conf is null: " + (jobConf == null) + " conf: "  + jobConf);
	}
	
	public Boolean exec(Tuple input) throws IOException {
		checkJobConf(); // will execute in map only
		return true;
	}
}