Package software.amazon.awssdk.crt.mqtt

Enum QualityOfService

java.lang.Object

java.lang.Enum<QualityOfService>

software.amazon.awssdk.crt.mqtt.QualityOfService

All Implemented Interfaces:

Serializable, Comparable<QualityOfService>

public enum QualityOfService
extends Enum<QualityOfService>

Quality of Service associated with a publish action or subscription [MQTT-4.3].

Enum Constant Summary

Enum Constants

Enum Constant	Description
AT_LEAST_ONCE	Message will be delivered at least once.
AT_MOST_ONCE	Message will be delivered at most once, or may not be delivered at all.
EXACTLY_ONCE	The message is always delivered exactly once.

Method Summary

Modifier and Type	Method	Description
static QualityOfService	getEnumValueFromInteger(int value)	Creates a Java QualityOfService enum value from a native integer value
int	getValue()
static QualityOfService	valueOf(String name)	Returns the enum constant of this type with the specified name.
static QualityOfService[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

AT_MOST_ONCE

public static final QualityOfService AT_MOST_ONCE

Message will be delivered at most once, or may not be delivered at all. There will be no ACK, and the message will not be stored.

AT_LEAST_ONCE

public static final QualityOfService AT_LEAST_ONCE

Message will be delivered at least once. It may be resent multiple times if errors occur before an ACK is returned to the sender. The message will be stored in case it has to be re-sent. This is the most common QualityOfService.

EXACTLY_ONCE

public static final QualityOfService EXACTLY_ONCE

The message is always delivered exactly once. This is the safest, but slowest QualityOfService, because multiple levels of handshake must happen to guarantee no duplication of messages.

Method Detail

values

public static QualityOfService[] 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 (QualityOfService c : QualityOfService.values())
    System.out.println(c);

Returns:

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

valueOf

public static QualityOfService 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

getValue

public int getValue()

Returns:

the native enum integer value associated with this Java enum value

getEnumValueFromInteger

public static QualityOfService getEnumValueFromInteger(int value)

Creates a Java QualityOfService enum value from a native integer value

Parameters:

value - native integer value for quality of service

Returns:

a new QualityOfService value