1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.hadoop.chukwa.extraction.demux.processor.mapper; 20 21 22 import java.util.HashMap; 23 import org.apache.log4j.Logger; 24 25 public class MapProcessorFactory { 26 static Logger log = Logger.getLogger(MapProcessorFactory.class); 27 28 private static HashMap<String, MapProcessor> processors = new HashMap<String, MapProcessor>(); // registry 29 30 public MapProcessorFactory() { 31 } 32 33 public static MapProcessor getProcessor(String parserClass) 34 throws UnknownRecordTypeException { 35 if (processors.containsKey(parserClass)) { 36 return processors.get(parserClass); 37 } else { 38 MapProcessor processor = null; 39 try { 40 processor = (MapProcessor) Class.forName(parserClass).getConstructor() 41 .newInstance(); 42 } catch (ClassNotFoundException e) { 43 throw new UnknownRecordTypeException("Unknown parserClass:" 44 + parserClass, e); 45 } catch (Exception e) { 46 throw new UnknownRecordTypeException("error constructing processor", e); 47 } 48 49 // TODO using a ThreadSafe/reuse flag to actually decide if we want 50 // to reuse the same processor again and again 51 processors.put(parserClass, processor); 52 return processor; 53 } 54 } 55 }