org.dromara.mica.mqtt.codec

Enum MqttQoS

java.lang.Object

java.lang.Enum<MqttQoS>

org.dromara.mica.mqtt.codec.MqttQoS

All Implemented Interfaces:

Serializable, Comparable<MqttQoS>

public enum MqttQoS
extends Enum<MqttQoS>

Mqtt QoS

Author:

netty

Enum Constant Summary

Enum Constants

Enum Constant and Description
FAILURE 失败
QOS0 QoS level 0 至多发送一次，发送即丢弃。
QOS1 QoS level 1 至少一次，都要在可变头部中附加一个16位的消息ID，SUBSCRIBE 和 UNSUBSCRIBE 消息使用 QoS level 1。
QOS2 QoS level 2 确保只有一次，仅仅在 PUBLISH 类型消息中出现，要求在可变头部中要附加消息ID。

Method Summary

Modifier and Type	Method and Description
String	toString()
int	value()
static MqttQoS	valueOf(int value)
static MqttQoS	valueOf(String name) Returns the enum constant of this type with the specified name.
static MqttQoS[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

QOS0

public static final MqttQoS QOS0

QoS level 0 至多发送一次，发送即丢弃。没有确认消息，也不知道对方是否收到。

QOS1

public static final MqttQoS QOS1

QoS level 1 至少一次，都要在可变头部中附加一个16位的消息ID，SUBSCRIBE 和 UNSUBSCRIBE 消息使用 QoS level 1。

QOS2

public static final MqttQoS QOS2

QoS level 2 确保只有一次，仅仅在 PUBLISH 类型消息中出现，要求在可变头部中要附加消息ID。

FAILURE

public static final MqttQoS FAILURE

失败

Method Detail

values

public static MqttQoS[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (MqttQoS c : MqttQoS.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static MqttQoS valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

value

public int value()

valueOf

public static MqttQoS valueOf(int value)

toString

public String toString()

Overrides:

toString in class Enum<MqttQoS>