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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..2018  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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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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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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'/
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@startuml
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title **µRtWare**\nurtSubscriberUnsubscribe()\n
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start
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if (Is HRT subscriber?) then (yes)
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  :lock topic;
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  fork
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    :unregister event;
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    note left
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      must be within lock because of HRT counter
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    endnote
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  fork again
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    :decrease topic HRT counter;
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  fork again
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    :remove self from topic list of HRT subscribers;
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    if (Was most critical subscriber?) then (yes)
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      :update QoS rate timer (@topic);
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    else (no)
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    endif
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  fork again
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    while (Unfetched messages left?) is (yes)
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      :lock message;
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      :decrease HRT counter;
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      :unlock message;
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    endwhile (no)
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  endfork
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  :unlock topic;
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else (no)
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  :unregister event;
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endif
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:reset members;
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note left
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  optional
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end note
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stop
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@enduml