程序包 org.apache.pulsar.client.api

接口 MessageId

所有超级接口:
Comparable<MessageId>, Serializable
@Public @Stable public interface MessageId extends Comparable<MessageId>, Serializable
Opaque unique identifier of a single message

The MessageId can be used to reference a specific message, for example when acknowledging, without having to retain the message content in memory for an extended period of time.

Message ids are Comparable and a bigger message id will imply that a message was published "after" the other one.

  • 字段概要

    字段
    修饰符和类型
    字段
    说明
    static final MessageId
    earliest
    MessageId that represents the oldest message available in the topic.
    static final MessageId
    latest
    MessageId that represents the next message published in the topic.

  • 方法概要

    修饰符和类型
    方法
    说明
    static MessageId
    fromByteArray(byte[] data)
    De-serialize a message id from a byte array.
    static MessageId
    fromByteArrayWithTopic(byte[] data, String topicName)
    De-serialize a message id from a byte array with its topic information attached.
    byte[]
    toByteArray()
    Serialize the message ID into a byte array.

    从接口继承的方法 java.lang.Comparable

    compareTo

  • 字段详细资料

    • earliest

      static final MessageId earliest
      MessageId that represents the oldest message available in the topic.

    • latest

      static final MessageId latest
      MessageId that represents the next message published in the topic.

  • 方法详细资料

    • toByteArray

      byte[] toByteArray()
      Serialize the message ID into a byte array.

      The serialized message id can be stored away and later get deserialized by using fromByteArray(byte[]).

    • fromByteArray

      static MessageId fromByteArray(byte[] data) throws IOException
      De-serialize a message id from a byte array.
      参数:
      data - byte array containing the serialized message id
      返回:
      the de-serialized messageId object
      抛出:
      IOException - if the de-serialization fails

    • fromByteArrayWithTopic

      static MessageId fromByteArrayWithTopic(byte[] data, String topicName) throws IOException
      De-serialize a message id from a byte array with its topic information attached.

      The topic information is needed when acknowledging a MessageId on a consumer that is consuming from multiple topics.

      参数:
      data - the byte array with the serialized message id
      topicName - the topic name
      返回:
      a instance
      抛出:
      IOException - if the de-serialization fails