DurabilityServiceQosPolicy Struct Reference

Data Fields
Duration_t	service_cleanup_delay
HistoryQosPolicyKind	history_kind
int	history_depth
int	max_samples
int	max_instances
int	max_samples_per_instance

Detailed Description

The DurablityServiceQosPolicy supports the durablity of data. The DDS API identifies several degrees of data durability.

1. VOLATILE: The data is volatile, and is not persisted beyond the initial publication.
2. TRANSIENT_LOCAL: The data is persisted locally within the source DataWriter. If that DataWriter is destroyed, or the containing application exits, the data is no longer available.
3. TRANSIENT: The data is persisted beyond the lifecycle of the originating DataWriter, and is available even after that DataWriter has been destroyed. However, data does not persist a reboot of the computer.
4. PERSISTENT: The data is persisted to 'off-line' storage, and is available even after a system reboot.

If a durability of TRANSIENT or PERSISTENT is specified, then a service beyond the source DataWriter must be established to provide advanced data durability. This QoS policy helps to configure that durablity service.

CoreDX DDS currently supports VOLATILE and TRANSIENT_LOCAL.

Field Documentation

history_depth

int history_depth

history depth

history_kind

HistoryQosPolicyKind history_kind

history kind

max_instances

int max_instances

max instances

max_samples

int max_samples

max samples

max_samples_per_instance

int max_samples_per_instance

max samples per instance

service_cleanup_delay

Duration_t service_cleanup_delay

cleanup delay