[20936] Change backup restore order

src/cpp/rtps/builtin/discovery/participant/PDP.cpp

@@ -413,6 +413,9 @@ bool PDP::enable()
         return true;
     }
 
+    // Perform pre-enable actions (if any)
+    pre_enable_actions();
+
     // Create lease events on already created proxy data objects
     for (ParticipantProxyData* pool_item : participant_proxies_pool_)
     {
@@ -443,6 +446,11 @@ bool PDP::enable()
     return builtin_endpoints_->enable_pdp_readers(mp_RTPSParticipant);
 }
 
+void PDP::pre_enable_actions()
+{
+    // Empty implementation
+}
+
 void PDP::disable()
 {
     // Extract all the participant proxies excluding first one (ourselves)

src/cpp/rtps/builtin/discovery/participant/PDP.h

@@ -131,6 +131,11 @@ class PDP : public fastdds::statistics::rtps::IProxyQueryable
      */
     bool enable();
 
+    /**
+     * @brief Perform actions before enabling the Participant Discovery Protocol if needed
+     */
+    virtual void pre_enable_actions();
+
     /**
      * @brief Disable the Participant Discovery Protocol
      */

src/cpp/rtps/builtin/discovery/participant/PDPServer.cpp

@@ -120,35 +120,6 @@ bool PDPServer::init(
         return false;
     }
 
-    std::vector<nlohmann::json> backup_queue;
-    if (durability_ == TRANSIENT)
-    {
-        nlohmann::json backup_json;
-        // If the DS is BACKUP, try to restore DDB from file
-        discovery_db().backup_in_progress(true);
-        if (read_backup(backup_json, backup_queue))
-        {
-            if (process_backup_discovery_database_restore(backup_json))
-            {
-                EPROSIMA_LOG_INFO(RTPS_PDP_SERVER, "DiscoveryDataBase restored correctly");
-            }
-        }
-        else
-        {
-            EPROSIMA_LOG_INFO(RTPS_PDP_SERVER,
-                    "Error reading backup file. Corrupted or unmissing file, restarting from scratch");
-        }
-
-        discovery_db().backup_in_progress(false);
-
-        discovery_db_.persistence_enable(get_ddb_queue_persistence_file_name());
-    }
-    else
-    {
-        // Allows the ddb to process new messages from this point
-        discovery_db_.enable();
-    }
-
     // Activate listeners
     EDPServer* edp = static_cast<EDPServer*>(mp_EDP);
     builtin_endpoints_->enable_pdp_readers(getRTPSParticipant());
@@ -178,14 +149,47 @@ bool PDPServer::init(
                         m_discovery.discovery_config.discoveryServer_client_syncperiod));
     ping_->restart_timer();
 
+    return true;
+}
+
+void PDPServer::pre_enable_actions()
+{
+    std::vector<nlohmann::json> backup_queue;
+    // Restore the DDB from file if this is a BACKUP server
+    if (durability_ == TRANSIENT)
+    {
+        nlohmann::json backup_json;
+        // If the DS is BACKUP, try to restore DDB from file
+        discovery_db().backup_in_progress(true);
+        if (read_backup(backup_json, backup_queue))
+        {
+            if (process_backup_discovery_database_restore(backup_json))
+            {
+                EPROSIMA_LOG_INFO(RTPS_PDP_SERVER, "DiscoveryDataBase restored correctly");
+            }
+        }
+        else
+        {
+            EPROSIMA_LOG_INFO(RTPS_PDP_SERVER,
+                    "Error reading backup file. Corrupted or unmissing file, restarting from scratch");
+        }
+
+        discovery_db().backup_in_progress(false);
+
+        discovery_db_.persistence_enable(get_ddb_queue_persistence_file_name());
+    }
+    else
+    {
+        // Allows the ddb to process new messages from this point
+        discovery_db_.enable();
+    }
+
     // Restoring the queue must be done after starting the routine
     if (durability_ == TRANSIENT)
     {
         // This vector is empty till backup queue is implemented
         process_backup_restore_queue(backup_queue);
     }
-
-    return true;
 }
 
 ParticipantProxyData* PDPServer::createParticipantProxyData(

src/cpp/rtps/builtin/discovery/participant/PDPServer.hpp

@@ -79,6 +79,12 @@ class PDPServer : public fastrtps::rtps::PDP
     bool init(
             fastrtps::rtps::RTPSParticipantImpl* part) override;
 
+    /**
+     * @brief Checks if a backup file needs to be restored for
+     * DiscoveryProtocol_t::BACKUP before enabling the Participant Discovery Protocol
+     */
+    void pre_enable_actions() override;
+
     /**
      * Creates an initializes a new participant proxy from a DATA(p) raw info
      * @param p ParticipantProxyData from DATA msg deserialization