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From tushargosavi <...@git.apache.org>
Subject [GitHub] incubator-apex-malhar pull request: APEXMALHAR-2011-2012 Avro to P...
Date Wed, 16 Mar 2016 06:43:53 GMT
Github user tushargosavi commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/211#discussion_r56287519
  
    --- Diff: contrib/src/main/java/com/datatorrent/contrib/avro/AvroToPojo.java ---
    @@ -0,0 +1,428 @@
    +/**
    + * 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.io.ByteArrayOutputStream;
    +import java.io.IOException;
    +import java.io.ObjectOutputStream;
    +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.Schema;
    +import org.apache.avro.Schema.Field;
    +import org.apache.avro.generic.GenericRecord;
    +import org.apache.commons.lang3.ClassUtils;
    +import org.apache.hadoop.classification.InterfaceStability;
    +
    +import com.google.common.collect.Lists;
    +
    +import com.datatorrent.api.AutoMetric;
    +import com.datatorrent.api.Context;
    +import com.datatorrent.api.Context.OperatorContext;
    +import com.datatorrent.api.Context.PortContext;
    +import com.datatorrent.api.DefaultInputPort;
    +import com.datatorrent.api.DefaultOutputPort;
    +import com.datatorrent.api.Operator;
    +import com.datatorrent.api.annotation.InputPortFieldAnnotation;
    +import com.datatorrent.api.annotation.OutputPortFieldAnnotation;
    +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. If this mapping is not
    + * provided then reflection is used to determine this mapping. As of now only
    + * primitive types are supported.
    + *
    + * @displayName Avro To Pojo
    + * @category Converter
    + * @tags avro
    + * @since 3.3.0
    + */
    +
    +@InterfaceStability.Evolving
    +public class AvroToPojo implements Operator
    +{
    +
    +  private List<Field> columnNames;
    +
    +  private Class<?> cls;
    +
    +  private static final String FIELD_SEPARATOR = ":";
    +  private static final String RECORD_SEPARATOR = ",";
    +
    +  private String genericRecordToPOJOFieldsMapping = null;
    +
    +  public String getGenericRecordToPOJOFieldsMapping()
    +  {
    +    return genericRecordToPOJOFieldsMapping;
    +  }
    +
    +  public void setGenericRecordToPOJOFieldsMapping(String genericRecordToPOJOFieldsMapping)
    +  {
    +    this.genericRecordToPOJOFieldsMapping = genericRecordToPOJOFieldsMapping;
    +  }
    +
    +  private String schemaFile;
    +
    +  private Schema schema;
    +
    +  private List<FieldInfo> fieldInfos;
    +
    +  private transient List<ActiveFieldInfo> columnFieldSetters = null;
    +
    +  @AutoMetric
    +  int recordCnt = 0;
    +
    +  @AutoMetric
    +  int errorCnt = 0;
    +
    +  @AutoMetric
    +  int fieldErrorCnt = 0;
    +
    +  public void parseSchema() throws IOException
    +  {
    +    setSchema(new Schema.Parser().parse(getSchemaString()));
    +  }
    +
    +  public String getSchemaString()
    +  {
    +    return schemaFile;
    +  }
    +
    +  public void setSchemaString(String schemaFile)
    +  {
    +    this.schemaFile = schemaFile;
    +  }
    +
    +  public Schema getSchema()
    +  {
    +    return schema;
    +  }
    +
    +  public void setSchema(Schema schema)
    +  {
    +    this.schema = schema;
    +  }
    +
    +  public byte[] serialize(Object obj) throws IOException
    +  {
    +    try (ByteArrayOutputStream b = new ByteArrayOutputStream()) {
    +      try (ObjectOutputStream o = new ObjectOutputStream(b)) {
    +        o.writeObject(obj);
    +      }
    +      return b.toByteArray();
    +    }
    +  }
    +
    +  @InputPortFieldAnnotation(optional = false)
    +  public final transient DefaultInputPort<GenericRecord> data = new DefaultInputPort<GenericRecord>()
    +  {
    +
    +    @Override
    +    public void process(GenericRecord tuple)
    +    {
    +
    +      try {
    +        Object obj = getPOJOFromGenericRecord(tuple, getCls());
    +
    +        if (obj != null) {
    +          output.emit(obj);
    +          recordCnt++;
    +        }
    +
    +      } catch (InstantiationException | IllegalAccessException e) {
    +        LOG.error("Could not initialize object of class - " + getClass().getName());
    +        errorCnt++;
    +      }
    +    }
    +
    +  };
    +
    +  @SuppressWarnings("unchecked")
    +  public Object getPOJOFromGenericRecord(GenericRecord tuple, Class<?> cls)
    +      throws InstantiationException, IllegalAccessException
    +  {
    +    Object newObj = getCls().newInstance();
    +
    +    try {
    +
    +      for (int i = 0; i < columnFieldSetters.size(); i++) {
    +
    +        AvroToPojo.ActiveFieldInfo afi = columnFieldSetters.get(i);
    +
    +        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");
    +          val = null;
    +          fieldErrorCnt++;
    +        }
    +
    +        if (val == null) {
    +          continue;
    +        }
    +
    +        try {
    +
    +          switch (st) {
    +
    +            case BOOLEAN:
    +
    +              afi.setterOrGetter = PojoUtils.createSetterBoolean(getCls(), afi.fieldInfo.getPojoFieldExpression());
    --- End diff --
    
    Can you generate setters and getters only once during setup or first time tuple is received,
no need to generated them for each record.


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