urtware / doc / activitydiagrams / request / frtrequest / urtFrtRequestRetrieve.uml @ 03ed5026
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µRtWare is a lightweight publish/subscribe middleware for real-time |
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applications. It was developed as part of the software habitat for the |
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Autonomous Mini Robot [1] (AMiRo) but can be used for other purposes as well. |
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Copyright (C) 2018..2020 Thomas Schöpping et al. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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/'### INTRO ##################################################################'/ |
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@startuml |
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title **µRtWare**\nurtFrtRequestRetrieve()\n |
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/'### PARAMETERS & RETURN ####################################################'/ |
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note |
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-- **request** : urt_frtrequest_t* -- |
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The request to retrieve. |
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Must not be ""NULL"". |
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==== |
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-- **return** : urt_status_t -- |
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Typcially returns ""URT_STATUS_OK"". |
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Returns ""URT_STATUS_REQUEST_BADOWNER"" if the request had to be removed from a service. |
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endnote |
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/'### PROCEDURE ##############################################################'/ |
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start |
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:lock request; |
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if (Request is owned by a service?) then (yes) |
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fork |
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partition "unqueue request" {
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:lock service; |
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fork |
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if (This was the first request in the queue?) then (yes) |
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:set ""requestQueue_front"" to ""next""; |
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else (no) |
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:set ""prev"" of preceeding request to ""prev"" of this reuqest; |
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endif |
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fork again |
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if (This was the final request in the queue?) then (yes) |
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:set ""requestQueue_back"" to ""prev""; |
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else (no) |
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:set ""next"" of preceeding request to ""next"" of this reuqest; |
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endif |
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fork again |
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if (This was the final FRT/SRT request?) then (yes) |
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if (There are FRT or SRT requests left in the queue?) then (yes) |
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:set ""requestQueue_fsrtBack"" to ""prev""; |
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else (no) |
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:set ""requestQueue_fsrtBack"" to ""NULL""; |
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endif |
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else (no) |
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endif |
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endfork |
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:unlock service; |
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} |
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fork again |
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:set ""owner"" to ""NULL""; |
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endfork |
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stop |
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note |
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Returns ""URT_STATUS_REQUEST_BADOWNER"". |
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endnote |
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else (no) |
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stop |
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note |
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Returns ""URT_STATUS_OK"". |
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endnote |
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endif |
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/'### OUTRO ##################################################################'/ |
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@enduml |