public enum MqttQualityOfServiceLevel extends Enum<MqttQualityOfServiceLevel>
| 枚举常量和说明 |
|---|
AtLeastOnce
最少一次
|
AtMostOnce
最多一次
|
ExactlyOnce
只有一次
|
OnlyTransfer
消息只发送到服务器而不触发发布订阅,该消息质量等级只对HSL的MQTT服务器有效
The message is only sent to the server without triggering publish and subscribe, the message quality level is only valid for the HSL MQTT server |
| 限定符和类型 | 方法和说明 |
|---|---|
static MqttQualityOfServiceLevel |
valueOf(String name)
返回带有指定名称的该类型的枚举常量。
|
static MqttQualityOfServiceLevel[] |
values()
按照声明该枚举类型的常量的顺序, 返回
包含这些常量的数组。
|
public static final MqttQualityOfServiceLevel AtMostOnce
public static final MqttQualityOfServiceLevel AtLeastOnce
public static final MqttQualityOfServiceLevel ExactlyOnce
public static final MqttQualityOfServiceLevel OnlyTransfer
public static MqttQualityOfServiceLevel[] values()
for (MqttQualityOfServiceLevel c : MqttQualityOfServiceLevel.values()) System.out.println(c);
public static MqttQualityOfServiceLevel valueOf(String name)
name - 要返回的枚举常量的名称。IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量NullPointerException - 如果参数为空值Copyright © 2022. All rights reserved.