| /** |
| * 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 com.datatorrent.contrib.util; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.util.List; |
| import java.util.Map; |
| |
| import com.esotericsoftware.kryo.Kryo; |
| import com.esotericsoftware.kryo.io.Input; |
| import com.esotericsoftware.kryo.io.Output; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.datatorrent.lib.util.FieldInfo; |
| import com.datatorrent.lib.util.FieldValueGenerator; |
| import com.datatorrent.lib.util.PojoUtils.Setter; |
| |
| public class FieldValueSerializableGenerator< T extends FieldInfo> extends FieldValueGenerator<T> |
| { |
| |
| public static < T extends FieldInfo > FieldValueSerializableGenerator<T> getFieldValueGenerator(final Class<?> clazz, List<T> fieldInfos) |
| { |
| return new FieldValueSerializableGenerator(clazz, fieldInfos); |
| } |
| |
| |
| private static final Logger logger = LoggerFactory.getLogger( FieldValueGenerator.class ); |
| //it's better to same kryo instance for both de/serialize |
| private Kryo _kryo = null; |
| private Class<?> clazz; |
| |
| private FieldValueSerializableGenerator(){} |
| |
| public FieldValueSerializableGenerator(Class<?> clazz, List<T> fieldInfos) |
| { |
| super(clazz, fieldInfos); |
| this.clazz = clazz; |
| } |
| |
| /** |
| * get the object which is serialized. |
| * this method will convert the object into a map from column name to column value and then serialize it |
| * |
| * @param obj |
| * @return |
| */ |
| public byte[] serializeObject( Object obj ) |
| { |
| //if don't have field information, just convert the whole object to byte[] |
| Object convertObj = obj; |
| |
| //if fields are specified, convert to map and then convert map to byte[] |
| if( fieldGetterMap != null && !fieldGetterMap.isEmpty() ) |
| { |
| convertObj = getFieldsValueAsMap(obj); |
| } |
| |
| ByteArrayOutputStream os = new ByteArrayOutputStream(); |
| Output output = new Output(os); |
| |
| getKryo().writeClassAndObject(output, convertObj); |
| output.flush(); |
| //output.toBytes() is empty. |
| return os.toByteArray(); |
| } |
| |
| |
| public Object deserializeObject( byte[] bytes ) |
| { |
| Object obj = getKryo().readClassAndObject( new Input( bytes ) ); |
| |
| |
| if( fieldGetterMap == null || fieldGetterMap.isEmpty() ) |
| return obj; |
| |
| // the obj in fact is a map, convert from map to object |
| try |
| { |
| Map valueMap = (Map)obj; |
| obj = clazz.newInstance(); |
| |
| for( Map.Entry< T, Setter<Object,Object>> entry : fieldSetterMap.entrySet() ) |
| { |
| T fieldInfo = entry.getKey(); |
| Setter<Object,Object> setter = entry.getValue(); |
| if( setter != null ) |
| { |
| setter.set(obj, valueMap.get( fieldInfo.getColumnName() ) ); |
| } |
| } |
| return obj; |
| } |
| catch( Exception e ) |
| { |
| logger.warn( "Coverting map to obj exception. ", e ); |
| return obj; |
| } |
| } |
| |
| protected Kryo getKryo() |
| { |
| if( _kryo == null ) |
| { |
| synchronized( this ) |
| { |
| if( _kryo == null ) |
| _kryo = new Kryo(); |
| _kryo.setClassLoader(clazz.getClassLoader()); |
| } |
| } |
| return _kryo; |
| } |
| } |