Topic Repository¶

TopicRepository provides APIs for querying Hiero topic information from a Mirror Node, including retrieving topic details, querying topic messages, and searching messages by sequence number.

Methods¶

Method	Description
`findTopicById(TopicId topicId)`	Retrieves topic information using a `TopicId` object.
`findTopicById(String topicId)`	Retrieves topic information using a topic ID string.
`getMessages(TopicId topicId)`	Retrieves messages published to a specific topic.
`getMessages(String topicId)`	Retrieves topic messages using a topic ID string.
`getMessageBySequenceNumber(TopicId topicId, long sequenceNumber)`	Retrieves a topic message using its sequence number.
`getMessageBySequenceNumber(String topicId, long sequenceNumber)`	Retrieves a topic message using topic ID string and sequence number.

Find Topic By ID¶

findTopicById(TopicId topicId)

TopicId topicId =
    TopicId.fromString("0.0.1234");

Optional<Topic> topic =
    topicRepository.findTopicById(topicId);

Get Topic Messages¶

getMessages(TopicId topicId)

TopicId topicId =
    TopicId.fromString("0.0.1234");

Page<TopicMessage> messages =
    topicRepository.getMessages(topicId);

Get Message By Sequence Number¶

getMessageBySequenceNumber(TopicId topicId, long sequenceNumber)

TopicId topicId =
    TopicId.fromString("0.0.1234");

Optional<TopicMessage> message =
    topicRepository.getMessageBySequenceNumber(
        topicId,
        1
    );