/**
* 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.alibaba.jstorm.hdfs.avro;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericContainer;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.io.BinaryEncoder;
import org.apache.avro.io.Decoder;
import org.apache.avro.io.DecoderFactory;
import org.apache.avro.io.EncoderFactory;
import java.io.IOException;
//Generously adapted from:
//https://github.com/kijiproject/kiji-express/blob/master/kiji-express/src/main/scala/org/kiji/express/flow/framework/serialization/AvroSerializer.scala
//Which has as an ASL2.0 license
/**
* This abstract class can be extended to implement concrete classes capable of (de)serializing generic avro objects
* across a Topology. The methods in the AvroSchemaRegistry interface specify how schemas can be mapped to unique
* identifiers and vice versa. Implementations based on pre-defining schemas or utilizing an external schema registry
* are provided.
*/
public abstract class AbstractAvroSerializer extends Serializer<GenericContainer> implements AvroSchemaRegistry {
public void write(Kryo kryo, Output output, GenericContainer record) {
String fingerPrint = this.getFingerprint(record.getSchema());
output.writeString(fingerPrint);
GenericDatumWriter<GenericContainer> writer = new GenericDatumWriter<>(record.getSchema());
BinaryEncoder encoder = EncoderFactory
.get()
.directBinaryEncoder(output, null);
try {
writer.write(record, encoder);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public GenericContainer read(Kryo kryo, Input input, Class<GenericContainer> aClass) {
Schema theSchema = this.getSchema(input.readString());
GenericDatumReader<GenericContainer> reader = new GenericDatumReader<>(theSchema);
Decoder decoder = DecoderFactory
.get()
.directBinaryDecoder(input, null);
GenericContainer foo;
try {
foo = reader.read(null, decoder);
} catch (IOException e) {
throw new RuntimeException(e);
}
return foo;
}
}