HISTORY

Specifies the behavior of RTI Connext DDS Micro in the case where the value of an instance changes (one or more times) before it can be successfully communicated to one or more existing subscribers. More...

Data Structures
struct	DDS_HistoryQosPolicy
	<<cert>> Specifies the behavior of RTI Connext DDS Micro in the case where the value of a sample changes (one or more times) before it can be successfully communicated to one or more existing subscribers. More...

Enumerations
enum	DDS_HistoryQosPolicyKind { DDS_KEEP_LAST_HISTORY_QOS, DDS_KEEP_ALL_HISTORY_QOS }
	Kinds of history. More...

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Detailed Description

Specifies the behavior of RTI Connext DDS Micro in the case where the value of an instance changes (one or more times) before it can be successfully communicated to one or more existing subscribers.

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Enumeration Type Documentation

enum DDS_HistoryQosPolicyKind

Kinds of history.

QoS:

DDS_HistoryQosPolicy

Enumerator:

DDS_KEEP_LAST_HISTORY_QOS

[default] Keep the last depth samples. On the publishing side, RTI Connext DDS Micro will only attempt to keep the most recent depth samples of each instance of data (identified by its key) managed by the DDS_DataWriter. On the subscribing side, the DDS_DataReader will only attempt to keep the most recent depth samples received for each instance (identified by its key) until the application takes them via the DDS_DataReader 's take() operation.

DDS_KEEP_ALL_HISTORY_QOS

Keep all the samples. On the publishing side, RTI Connext DDS Micro will attempt to keep all samples (representing each value written) of each instance of data (identified by its key) managed by the DDS_DataWriter until they can be delivered to all subscribers. On the subscribing side, RTI Connext DDS Micro will attempt to keep all samples of each instance of data (identified by its key) managed by the DDS_DataReader. These samples are kept until the application takes them from RTI Connext DDS Micro via the take() operation.