MqttQoS Type — netty Architecture

Source Code

codec-mqtt/src/main/java/io/netty/handler/codec/mqtt/MqttQoS.java lines 18–48

public enum MqttQoS {
    AT_MOST_ONCE(0),
    AT_LEAST_ONCE(1),
    EXACTLY_ONCE(2),
    FAILURE(0x80);

    private final int value;

    MqttQoS(int value) {
        this.value = value;
    }

    public int value() {
        return value;
    }

    public static MqttQoS valueOf(int value) {
        switch (value) {
        case 0:
            return AT_MOST_ONCE;
        case 1:
            return AT_LEAST_ONCE;
        case 2:
            return EXACTLY_ONCE;
        case 0x80:
            return FAILURE;
        default:
            throw new IllegalArgumentException("invalid QoS: " + value);
        }
    }
}