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Make it possible to create reader with custom RHC

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The default RHC implementation is not always ideal and rather than
trying to squeeze everything in a fixed interface it makes more sense to
allow the caller to provide an arbitrary implementation of the
interface.

This is not yet a stable interface.

Signed-off-by: Erik Boasson <eb@ilities.com>
This commit is contained in:
Erik Boasson 2019-09-02 09:08:13 +02:00 • committed by eboasson
parent 57d20e07a4
commit fbc05777f3
7 changed files with 75 additions and 14 deletions
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29
src/core/ddsc/include/dds/dds.h
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@ -49,6 +49,7 @@ typedef int32_t dds_entity_t;
extern "C" {
#endif
struct dds_rhc;
struct ddsi_serdata;
#define DDS_MIN_PSEUDO_HANDLE ((dds_entity_t) 0x7fff0000)
@ -1195,6 +1196,34 @@ dds_create_reader(
const dds_qos_t *qos,
const dds_listener_t *listener);
/**
* @brief Creates a new instance of a DDS reader with a custom history cache.
*
* This implicit subscriber will be deleted automatically when the created reader
* is deleted.
*
* @param[in] participant_or_subscriber The participant or subscriber on which the reader is being created.
* @param[in] topic The topic to read.
* @param[in] qos The QoS to set on the new reader (can be NULL).
* @param[in] listener Any listener functions associated with the new reader (can be NULL).
* @param[in] rhc Reader history cache to use, reader becomes the owner
*
* @returns A valid reader handle or an error code.
*
* @retval >0
* A valid reader handle.
* @retval DDS_RETCODE_ERROR
* An internal error occurred.
*/
/* TODO: Complete list of error codes */
DDS_EXPORT dds_entity_t
dds_create_reader_rhc(
dds_entity_t participant_or_subscriber,
dds_entity_t topic,
const dds_qos_t *qos,
const dds_listener_t *listener,
struct dds_rhc *rhc);
/**
* @brief Wait until reader receives all historic data
*