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AvroToPojo.java
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AvroToPojo.java
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/**
* 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.avro;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.avro.AvroRuntimeException;
import org.apache.avro.generic.GenericRecord;
import org.apache.commons.lang3.ClassUtils;
import org.apache.hadoop.classification.InterfaceStability;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Lists;
import com.datatorrent.api.AutoMetric;
import com.datatorrent.api.Context;
import com.datatorrent.api.Context.PortContext;
import com.datatorrent.api.DefaultInputPort;
import com.datatorrent.api.DefaultOutputPort;
import com.datatorrent.api.annotation.OutputPortFieldAnnotation;
import com.datatorrent.common.util.BaseOperator;
import com.datatorrent.lib.util.FieldInfo;
import com.datatorrent.lib.util.FieldInfo.SupportType;
import com.datatorrent.lib.util.PojoUtils;
/**
* <p>
* AvroToPojo
* </p>
* A generic implementation for conversion from Avro to POJO. The POJO class
* name & field mapping should be provided by the user.<br>
* If this mapping is not provided then reflection is used to determine this
* mapping.<br>
* As of now only primitive types are supported.<br>
* Error records are emitted on the errorPort if connected
*
* @displayName Avro To Pojo
* @category Converter
* @tags avro
*/
@InterfaceStability.Evolving
public class AvroToPojo extends BaseOperator
{
private transient Class<?> pojoClass;
private static final String FIELD_SEPARATOR = ":";
private static final String RECORD_SEPARATOR = ",";
private String genericRecordToPOJOFieldsMapping = null;
private List<FieldInfo> fieldInfos;
private List<ActiveFieldInfo> columnFieldSetters;
@AutoMetric
@VisibleForTesting
int recordCount = 0;
@AutoMetric
@VisibleForTesting
int errorCount = 0;
@AutoMetric
@VisibleForTesting
int fieldErrorCount = 0;
public final transient DefaultOutputPort<GenericRecord> errorPort = new DefaultOutputPort<GenericRecord>();
/**
* Returns a string representing mapping from generic record to POJO fields
*/
public String getGenericRecordToPOJOFieldsMapping()
{
return genericRecordToPOJOFieldsMapping;
}
/**
* Comma separated list mapping a field in Avro schema to POJO field eg :
* orderId:orderId:INTEGER,total:total:DOUBLE
*/
public void setGenericRecordToPOJOFieldsMapping(String genericRecordToPOJOFieldsMapping)
{
this.genericRecordToPOJOFieldsMapping = genericRecordToPOJOFieldsMapping;
}
public final transient DefaultInputPort<GenericRecord> data = new DefaultInputPort<GenericRecord>()
{
@Override
public void process(GenericRecord tuple)
{
processTuple(tuple);
}
};
/**
* Converts given Generic Record and to a POJO and emits it
*/
protected void processTuple(GenericRecord tuple)
{
try {
Object obj = getPOJOFromGenericRecord(tuple);
if (obj != null) {
output.emit(obj);
recordCount++;
} else if (errorPort.isConnected()) {
errorPort.emit(tuple);
errorCount++;
}
} catch (InstantiationException | IllegalAccessException e) {
LOG.error("Could not initialize object of class -" + getClass().getName(), e);
errorCount++;
}
}
/**
* Returns a POJO from a Generic Record
*
* @return Object
*/
@SuppressWarnings("unchecked")
private Object getPOJOFromGenericRecord(GenericRecord tuple) throws InstantiationException, IllegalAccessException
{
Object newObj = getPojoClass().newInstance();
try {
for (int i = 0; i < columnFieldSetters.size(); i++) {
AvroToPojo.ActiveFieldInfo afi = columnFieldSetters.get(i);
SupportType st = afi.fieldInfo.getType();
Object val = null;
try {
val = tuple.get(afi.fieldInfo.getColumnName());
} catch (Exception e) {
LOG.error("Could not find field -" + afi.fieldInfo.getColumnName() + "- in the generic record", e);
val = null;
fieldErrorCount++;
}
if (val == null) {
continue;
}
try {
switch (st) {
case BOOLEAN:
((PojoUtils.SetterBoolean<Object>)afi.setterOrGetter).set(newObj,
(boolean)tuple.get(afi.fieldInfo.getColumnName()));
break;
case DOUBLE:
((PojoUtils.SetterDouble<Object>)afi.setterOrGetter).set(newObj,
(double)tuple.get(afi.fieldInfo.getColumnName()));
break;
case FLOAT:
((PojoUtils.SetterFloat<Object>)afi.setterOrGetter).set(newObj,
(float)tuple.get(afi.fieldInfo.getColumnName()));
break;
case INTEGER:
((PojoUtils.SetterInt<Object>)afi.setterOrGetter).set(newObj,
(int)tuple.get(afi.fieldInfo.getColumnName()));
break;
case STRING:
((PojoUtils.Setter<Object, String>)afi.setterOrGetter).set(newObj,
new String(tuple.get(afi.fieldInfo.getColumnName()).toString()));
break;
case LONG:
((PojoUtils.SetterLong<Object>)afi.setterOrGetter).set(newObj,
(long)tuple.get(afi.fieldInfo.getColumnName()));
break;
default:
throw new AvroRuntimeException("Invalid Support Type");
}
} catch (AvroRuntimeException e) {
LOG.error("Exception in setting value", e);
fieldErrorCount++;
}
}
} catch (Exception ex) {
LOG.error("Generic Exception in setting value" + ex.getMessage());
errorCount++;
newObj = null;
}
return newObj;
}
/**
* Use reflection to generate field info values if the user has not provided
* the inputs mapping
*
* @return String representing the POJO field to Avro field mapping
*/
private String generateFieldInfoInputs(Class<?> cls)
{
java.lang.reflect.Field[] fields = cls.getDeclaredFields();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < fields.length; i++) {
java.lang.reflect.Field f = fields[i];
Class<?> c = ClassUtils.primitiveToWrapper(f.getType());
sb.append(f.getName()).append(FIELD_SEPARATOR).append(f.getName()).append(FIELD_SEPARATOR)
.append(c.getSimpleName().toUpperCase()).append(RECORD_SEPARATOR);
}
return sb.substring(0, sb.length() - 1);
}
/**
* Creates a map representing fieldName in POJO:field in Generic Record:Data
* type
*
* @return List of FieldInfo
*/
private List<FieldInfo> createFieldInfoMap(String str)
{
fieldInfos = new ArrayList<FieldInfo>();
StringTokenizer strtok = new StringTokenizer(str, RECORD_SEPARATOR);
while (strtok.hasMoreTokens()) {
String[] token = strtok.nextToken().split(FIELD_SEPARATOR);
try {
fieldInfos.add(new FieldInfo(token[0], token[1], SupportType.valueOf(token[2])));
} catch (Exception e) {
LOG.error("Invalid support type", e);
}
}
return fieldInfos;
}
@OutputPortFieldAnnotation(schemaRequired = true)
public final transient DefaultOutputPort<Object> output = new DefaultOutputPort<Object>()
{
public void setup(PortContext context)
{
setPojoClass(context.getValue(Context.PortContext.TUPLE_CLASS));
columnFieldSetters = Lists.newArrayList();
/**
* Check if the mapping of Generic record fields to POJO is given, else
* use reflection
*/
if (getGenericRecordToPOJOFieldsMapping() == null) {
setFieldInfos(createFieldInfoMap(generateFieldInfoInputs(getPojoClass())));
} else {
setFieldInfos(createFieldInfoMap(getGenericRecordToPOJOFieldsMapping()));
}
initColumnFieldSetters(getFieldInfos());
initializeActiveFieldSetters();
}
};
@Override
public void endWindow()
{
errorCount = 0;
fieldErrorCount = 0;
recordCount = 0;
}
private Class<?> getPojoClass()
{
return pojoClass;
}
public void setPojoClass(Class<?> pojoClass)
{
this.pojoClass = pojoClass;
}
/**
* Class that maps fieldInfo to its getters or setters
*/
protected static class ActiveFieldInfo
{
final FieldInfo fieldInfo;
Object setterOrGetter;
ActiveFieldInfo(FieldInfo fieldInfo)
{
this.fieldInfo = fieldInfo;
}
}
/**
* A list of {@link FieldInfo}s where each item maps a column name to a pojo
* field name.
*/
private List<FieldInfo> getFieldInfos()
{
return fieldInfos;
}
/**
* Add the Active Fields to the columnFieldSetters {@link ActiveFieldInfo}s
*/
private void initColumnFieldSetters(List<FieldInfo> fieldInfos)
{
for (FieldInfo fi : fieldInfos) {
if (columnFieldSetters == null) {
columnFieldSetters = Lists.newArrayList();
}
columnFieldSetters.add(new AvroToPojo.ActiveFieldInfo(fi));
}
}
/**
* Sets the {@link FieldInfo}s. A {@link FieldInfo} maps a store column to a
* pojo field name.<br/>
* The value from fieldInfo.column is assigned to
* fieldInfo.pojoFieldExpression.
*
* @description $[].columnName name of the Output Field in POJO
* @description $[].pojoFieldExpression expression to get the respective field
* from generic record
* @useSchema $[].pojoFieldExpression outputPort.fields[].name
*/
private void setFieldInfos(List<FieldInfo> fieldInfos)
{
this.fieldInfos = fieldInfos;
}
/**
* Initialize the setters for generating the POJO
*/
private void initializeActiveFieldSetters()
{
for (int i = 0; i < columnFieldSetters.size(); i++) {
ActiveFieldInfo activeFieldInfo = columnFieldSetters.get(i);
SupportType st = activeFieldInfo.fieldInfo.getType();
switch (st) {
case BOOLEAN:
activeFieldInfo.setterOrGetter = PojoUtils.createSetterBoolean(getPojoClass(),
activeFieldInfo.fieldInfo.getPojoFieldExpression());
break;
case DOUBLE:
activeFieldInfo.setterOrGetter = PojoUtils.createSetterDouble(getPojoClass(),
activeFieldInfo.fieldInfo.getPojoFieldExpression());
break;
case FLOAT:
activeFieldInfo.setterOrGetter = PojoUtils.createSetterFloat(getPojoClass(),
activeFieldInfo.fieldInfo.getPojoFieldExpression());
break;
case INTEGER:
activeFieldInfo.setterOrGetter = PojoUtils.createSetterInt(getPojoClass(),
activeFieldInfo.fieldInfo.getPojoFieldExpression());
break;
case STRING:
activeFieldInfo.setterOrGetter = PojoUtils.createSetter(getPojoClass(),
activeFieldInfo.fieldInfo.getPojoFieldExpression(), activeFieldInfo.fieldInfo.getType().getJavaType());
break;
case LONG:
activeFieldInfo.setterOrGetter = PojoUtils.createSetterLong(getPojoClass(),
activeFieldInfo.fieldInfo.getPojoFieldExpression());
break;
default:
activeFieldInfo.setterOrGetter = PojoUtils.createSetter(getPojoClass(),
activeFieldInfo.fieldInfo.getPojoFieldExpression(), Byte.class);
break;
}
columnFieldSetters.get(i).setterOrGetter = activeFieldInfo.setterOrGetter;
}
}
private static final Logger LOG = LoggerFactory.getLogger(AvroToPojo.class);
}