org.apache.druid.data.input.avro.InlineSchemaAvroBytesDecoder Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of druid-avro-extensions Show documentation
druid-avro-extensions
The newest version!
/*
 * 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 org.apache.druid.data.input.avro;

import com.fasterxml.jackson.annotation.JacksonInject;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.io.DatumReader;
import org.apache.avro.io.DecoderFactory;
import org.apache.avro.util.ByteBufferInputStream;
import org.apache.druid.guice.annotations.Json;
import org.apache.druid.java.util.common.logger.Logger;
import org.apache.druid.java.util.common.parsers.ParseException;

import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.Map;

/**
 */
public class InlineSchemaAvroBytesDecoder implements AvroBytesDecoder
{
  private static final Logger LOGGER = new Logger(InlineSchemaAvroBytesDecoder.class);

  private final Schema schemaObj;
  private final Map schema;
  private final DatumReader reader;

  @JsonCreator
  public InlineSchemaAvroBytesDecoder(
      @JacksonInject @Json ObjectMapper mapper,
      @JsonProperty("schema") Map schema
  ) throws Exception
  {
    Preconditions.checkArgument(schema != null, "schema must be provided");

    this.schema = schema;
    String schemaStr = mapper.writeValueAsString(schema);

    LOGGER.debug("Schema string [%s]", schemaStr);
    this.schemaObj = new Schema.Parser().parse(schemaStr);
    this.reader = new GenericDatumReader<>(this.schemaObj);
  }

  //For UT only
  @VisibleForTesting
  InlineSchemaAvroBytesDecoder(Schema schemaObj)
  {
    this.schemaObj = schemaObj;
    this.reader = new GenericDatumReader<>(schemaObj);
    this.schema = null;
  }

  @JsonProperty
  public Map getSchema()
  {
    return schema;
  }

  @Override
  public GenericRecord parse(ByteBuffer bytes)
  {
    try (ByteBufferInputStream inputStream = new ByteBufferInputStream(Collections.singletonList(bytes))) {
      return reader.read(null, DecoderFactory.get().binaryDecoder(inputStream, null));
    }
    catch (Exception e) {
      throw new ParseException(null, e, "Failed to read Avro message");
    }
  }
}