isValidClientId() — netty Function Reference

Architecture documentation for the isValidClientId() function in MqttCodecUtil.java from the netty codebase.

Function java Buffer Allocators

Entity Profile

Buffer→ Allocators→ isValidClientId() — netty Function Reference

Dependency Diagram

graph TD
  d8241bea_5097_fd1a_ef25_f6a275af9502["isValidClientId()"]
  8cc4b5f5_1c6e_ed7b_93cd_8de978fc304c["MqttCodecUtil"]
  d8241bea_5097_fd1a_ef25_f6a275af9502 -->|defined in| 8cc4b5f5_1c6e_ed7b_93cd_8de978fc304c
  style d8241bea_5097_fd1a_ef25_f6a275af9502 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

codec-mqtt/src/main/java/io/netty/handler/codec/mqtt/MqttCodecUtil.java lines 59–70

    static boolean isValidClientId(MqttVersion mqttVersion, int maxClientIdLength, String clientId) {
        if (mqttVersion == MqttVersion.MQTT_3_1) {
            return clientId != null && clientId.length() >= MIN_CLIENT_ID_LENGTH &&
                clientId.length() <= maxClientIdLength;
        }
        if (mqttVersion == MqttVersion.MQTT_3_1_1 || mqttVersion == MqttVersion.MQTT_5) {
            // In 3.1.3.1 Client Identifier of MQTT 3.1.1 and 5.0 specifications, The Server MAY allow ClientId’s
            // that contain more than 23 encoded bytes. And, The Server MAY allow zero-length ClientId.
            return clientId != null;
        }
        throw new IllegalArgumentException(mqttVersion + " is unknown mqtt version");
    }