Enum QoSDurabilityPolicy

pub enum QoSDurabilityPolicy {
    SystemDefault = 0,
    TransientLocal = 1,
    Volatile = 2,
}

The DURABILITY DDS QoS policy.

If a subscription is created after some messages have already been published, it is possible for the subscription to receive a number of previously-published messages by using the “transient local” durability kind on both ends. For this, the publisher must still exist when the subscription is created.

Compatibility

Publisher	Subscription	Compatible	Behavior
TransientLocal	TransientLocal	yes	Deliver old messages to new subscriptions
TransientLocal	Volatile	yes	Deliver only new messages
Volatile	TransientLocal	no	-
Volatile	Volatile	yes	Deliver only new messages

Variants

SystemDefault = 0

Use the default policy of the RMW layer.

TransientLocal = 1

Re-deliver old messages.

• For publishers: Retain messages for later delivery.
• For subscriptions: Request delivery of old messages.

Volatile = 2

Do not retain/request old messages.

Trait Implementations

impl Clone for QoSDurabilityPolicy

fn clone(&self) -> QoSDurabilityPolicy

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for QoSDurabilityPolicy

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Ord for QoSDurabilityPolicy

fn cmp(&self, other: &QoSDurabilityPolicy) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for QoSDurabilityPolicy

fn eq(&self, other: &QoSDurabilityPolicy) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for QoSDurabilityPolicy

fn partial_cmp(&self, other: &QoSDurabilityPolicy) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for QoSDurabilityPolicy

impl Eq for QoSDurabilityPolicy

impl StructuralPartialEq for QoSDurabilityPolicy