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36 package gr.grnet.aquarium.message.avro
38 import gr.grnet.aquarium.util.json.JsonHelpers
39 import java.io.{OutputStream, ByteArrayOutputStream}
40 import org.apache.avro.Schema
41 import org.apache.avro.generic.{GenericRecord, GenericDatumWriter}
42 import org.apache.avro.io.{JsonDecoder, DecoderFactory, JsonEncoder, EncoderFactory}
43 import org.apache.avro.specific.{SpecificDatumReader, SpecificDatumWriter, SpecificRecord}
47 * Provides helper methods for generic Avro-related facilities.
49 * @author Christos KK Loverdos <loverdos@gmail.com>
52 private[this] final val DefaultEncoderFactory = EncoderFactory.get()
53 private[this] final val DefaultDecoderFactory = DecoderFactory.get()
55 def getJsonEncoder(schema: Schema, out: OutputStream): JsonEncoder = {
56 val encoder = DefaultEncoderFactory.jsonEncoder(schema, out)
57 val jsonGenerator = JsonHelpers.getJsonGenerator(out)
58 encoder.configure(jsonGenerator)
61 def getJsonDecoder(schema: Schema, in: String): JsonDecoder = {
62 DefaultDecoderFactory.jsonDecoder(schema, in)
65 def specificRecordOfJsonString[R <: SpecificRecord](json: String, fresh: R): R = {
66 val schema = fresh.getSchema
67 val decoder = getJsonDecoder(schema, json)
68 val reader = new SpecificDatumReader[R](schema)
69 reader.read(fresh, decoder)
72 def jsonStringOfSpecificRecord[T <: SpecificRecord](t: T): String = {
73 val schema = t.getSchema()
74 val out = new ByteArrayOutputStream()
75 val encoder = getJsonEncoder(schema, out)
76 val writer = new SpecificDatumWriter[T](schema)
78 writer.write(t, encoder)
83 def jsonStringOfGenericRecord[T <: GenericRecord](t: T): String = {
84 val schema = t.getSchema()
85 val out = new ByteArrayOutputStream()
86 val encoder = getJsonEncoder(schema, out)
87 val writer = new GenericDatumWriter[T](schema)
89 writer.write(t, encoder)
94 def bytesOfSpecificRecord[R <: SpecificRecord](r: R): Array[Byte] = {
95 val schema = r.getSchema
96 val out = new ByteArrayOutputStream()
97 val encoder = EncoderFactory.get().binaryEncoder(out, null)
98 val writer = new SpecificDatumWriter[R](schema)
100 writer.write(r, encoder)
105 def specificRecordOfBytes[R <: SpecificRecord](bytes: Array[Byte], fresh: R): R = {
106 val decoder = DefaultDecoderFactory.binaryDecoder(bytes, null)
107 val reader = new SpecificDatumReader[R](fresh.getSchema)
108 reader.read(fresh, decoder)