Java Schema.Parser方法代碼示例

import org.apache.avro.Schema; //導入方法依賴的package包/類
/**
 * Decode the context from the transport.
 * 
 * @param input The FinancialForce Orizuru Avro Transport message from which to decode the context.
 * @throws OrizuruConsumerException Exception thrown if decoding the context fails.
 */
@Override
public void decodeFromTransport(Transport input) throws OrizuruConsumerException {

	try {

		String contextSchemaStr = input.getContextSchema().toString();
		Schema.Parser parser = new Schema.Parser();
		this.schema = parser.parse(contextSchemaStr);

		ByteBuffer contextBuffer = input.getContextBuffer();
		this.data = contextBuffer.array();

	} catch (Exception ex) {
		throw new DecodeContextException(ex);
	}

}
 

import org.apache.avro.Schema; //導入方法依賴的package包/類
private Schema loadFromUrl(String schemaUrl) throws IOException {
  Configuration conf = new Configuration();
  Schema.Parser parser = new Schema.Parser();
  if (schemaUrl.toLowerCase(Locale.ENGLISH).startsWith("hdfs://")) {
    FileSystem fs = FileSystem.get(conf);
    FSDataInputStream input = null;
    try {
      input = fs.open(new Path(schemaUrl));
      return parser.parse(input);
    } finally {
      if (input != null) {
        input.close();
      }
    }
  } else {
    InputStream is = null;
    try {
      is = new URL(schemaUrl).openStream();
      return parser.parse(is);
    } finally {
      if (is != null) {
        is.close();
      }
    }
  }
}
 

import org.apache.avro.Schema; //導入方法依賴的package包/類
@Override
public Schema load(String url) throws IOException {
  Schema.Parser parser = new Schema.Parser();
  InputStream is = null;
  try {
    FileSystem fs = FileSystem.get(URI.create(url), conf);
    if (url.toLowerCase(Locale.ENGLISH).startsWith("hdfs:/")) {
      is = fs.open(new Path(url));
    } else {
      is = new URL(url).openStream();
    }
    return parser.parse(is);
  } finally {
    if (is != null) {
      is.close();
    }
  }
}
 

import org.apache.avro.Schema; //導入方法依賴的package包/類
@Override
public void init(java.io.InputStream inputStream, java.util.Properties props) {
  topic = props.getProperty("topic");
  if (props.containsKey("parse.key")) {
    parseKey = props.getProperty("parse.key").trim().toLowerCase().equals("true");
  }
  if (props.containsKey("key.separator")) {
    keySeparator = props.getProperty("key.separator");
  }
  if (props.containsKey("ignore.error")) {
    ignoreError = props.getProperty("ignore.error").trim().toLowerCase().equals("true");
  }
  reader = new BufferedReader(new InputStreamReader(inputStream));
  String url = props.getProperty(AbstractKafkaAvroSerDeConfig.SCHEMA_REGISTRY_URL_CONFIG);
  if (url == null) {
    throw new ConfigException("Missing schema registry url!");
  }
  schemaRegistry = new CachedSchemaRegistryClient(
      url, AbstractKafkaAvroSerDeConfig.MAX_SCHEMAS_PER_SUBJECT_DEFAULT);
  if (!props.containsKey("value.schema")) {
    throw new ConfigException("Must provide the Avro schema string in value.schema");
  }
  String valueSchemaString = props.getProperty("value.schema");
  Schema.Parser parser = new Schema.Parser();
  valueSchema = parser.parse(valueSchemaString);

  if (parseKey) {
    if (!props.containsKey("key.schema")) {
      throw new ConfigException("Must provide the Avro schema string in key.schema");
    }
    String keySchemaString = props.getProperty("key.schema");
    keySchema = parser.parse(keySchemaString);
  }
  keySubject = topic + "-key";
  valueSubject = topic + "-value";
}
 

import org.apache.avro.Schema; //導入方法依賴的package包/類
private static Schema parseSchema(String schemaString) {
  try {
    Schema.Parser parser1 = new Schema.Parser();
    Schema schema = parser1.parse(schemaString);
    return schema;
  } catch (SchemaParseException e) {
    return null;
  }
}
 

import org.apache.avro.Schema; //導入方法依賴的package包/類
/**
 * 將avro格式的數據寫入到parquet文件中
 *
 * @param parquetPath
 */
public void write(String parquetPath) {
    Schema.Parser parser = new Schema.Parser();
    try {
        Schema schema = parser.parse(AvroParquetOperation.class.getClassLoader().getResourceAsStream("StringPair.avsc"));
        GenericRecord datum = new GenericData.Record(schema);
        datum.put("left", "L");
        datum.put("right", "R");

        Path path = new Path(parquetPath);
        System.out.println(path);
        AvroParquetWriter<GenericRecord> writer = new AvroParquetWriter<GenericRecord>(path, schema);
        writer.write(datum);
        writer.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
 

import org.apache.avro.Schema; //導入方法依賴的package包/類
/**
 *
 * @param args
 * @throws InterruptedException
 */
public static void main(String[] args) throws InterruptedException {
    Properties props = new Properties();
    props.put("bootstrap.servers", "localhost:9092");
    props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
    props.put("value.serializer", "org.apache.kafka.common.serialization.ByteArraySerializer");

    Schema.Parser parser = new Schema.Parser();
    Schema schema = parser.parse(USER_SCHEMA);
    Injection<GenericRecord, byte[]> recordInjection = GenericAvroCodecs.toBinary(schema);

    KafkaProducer<String, byte[]> producer = new KafkaProducer<>(props);
    SplittableRandom random = new SplittableRandom();

    while (true) {
        GenericData.Record avroRecord = new GenericData.Record(schema);
        avroRecord.put("str1", "Str 1-" + random.nextInt(10));
        avroRecord.put("str2", "Str 2-" + random.nextInt(1000));
        avroRecord.put("int1", random.nextInt(10000));

        byte[] bytes = recordInjection.apply(avroRecord);

        ProducerRecord<String, byte[]> record = new ProducerRecord<>("mytopic", bytes);
        producer.send(record);
        Thread.sleep(100);
    }

}
 

import org.apache.avro.Schema; //導入方法依賴的package包/類
private static Schema createPrimitiveSchema(Schema.Parser parser, String type) {
  String schemaString = String.format("{\"type\" : \"%s\"}", type);
  return parser.parse(schemaString);
}
 

import org.apache.avro.Schema; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception{

    // Check arguments length value
    if(args.length == 0){
      System.out.println("Enter topic name");
      return;
    }

    //Assign topicName to string variable
    String topicName = args[0].toString();
    int number = Integer.parseInt(args[1]);
    int partition = Integer.parseInt(args[2]);

    // create instance for properties to access producer configs
    Properties props = new Properties();

    //Assign localhost id
    props.put("bootstrap.servers", "localhost:9092");

    //Set acknowledgements for producer requests.
    props.put("acks", "all");

    //If the request fails, the producer can automatically retry,
    props.put("retries", 0);

    //Specify buffer size in config
    props.put("batch.size", 16384);

    //Reduce the no of requests less than 0
    props.put("linger.ms", 1);

    //The buffer.memory controls the total amount of memory available to the producer for buffering.
    props.put("buffer.memory", 33554432);

    props.put("key.serializer",
      "io.confluent.kafka.serializers.KafkaAvroSerializer");

    props.put("value.serializer",
      "io.confluent.kafka.serializers.KafkaAvroSerializer");

    props.put("schema.registry.url", "http://localhost:8081");

    Producer<Object, Object> producer = new KafkaProducer
      <Object, Object>(props);

    String userSchema = "{\"type\":\"record\"," +
      "\"name\":\"myrecord\"," +
      "\"fields\":[{\"name\":\"url\",\"type\":\"string\"}, {\"name\":\"id\",\"type\":\"int\"}]}";
    Schema.Parser parser = new Schema.Parser();
    Schema schema = parser.parse(userSchema);

    for(int i=0; i< number; i++) {
      GenericRecord avroRecord = new GenericData.Record(schema);
      avroRecord.put("url", "google.com");
      avroRecord.put("id", i);
      ProducerRecord<Object, Object> record = new ProducerRecord(topicName, partition,"key", avroRecord);
      producer.send(record);
    }

    System.out.println("Messages sent successfully");
    producer.close();
  }