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FairMQ: Implement Take/ReleaseDeviceControl plugin API

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The main function of this API is to make sure only one plugin is
controlling the device state transitions at a time. The
ReleaseDeviceControl() signal is used to implement a function
WaitForPluginsToReleaseDeviceControl() which is used to block the main
thread if a control plugin is used.
This commit is contained in:
Dennis Klein
2017-09-13 21:34:50 +02:00
committed by Mohammad Al-Turany
parent dfb2bac4bc
commit 2af3ae99eb
5 changed files with 143 additions and 16 deletions
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76
fairmq/PluginServices.cxx
View File

@@ -9,6 +9,7 @@
#include <fairmq/PluginServices.h>
using namespace fair::mq;
using namespace std;
const std::unordered_map<std::string, PluginServices::DeviceState> PluginServices::fkDeviceStateStrMap = {
{"OK", DeviceState::Ok},
@@ -85,3 +86,78 @@ const std::unordered_map<PluginServices::DeviceStateTransition, FairMQDevice::Ev
{DeviceStateTransition::End, FairMQDevice::END},
{DeviceStateTransition::ErrorFound, FairMQDevice::ERROR_FOUND}
};
auto PluginServices::ChangeDeviceState(const std::string& controller, const DeviceStateTransition next) -> void
{
lock_guard<mutex> lock{fDeviceControllerMutex};
if(!fDeviceController) fDeviceController = controller;
if(fDeviceController == controller)
{
fDevice->ChangeState(fkDeviceStateTransitionMap.at(next));
}
else
{
throw DeviceControlError{tools::ToString(
"Plugin ", controller, " is not allowed to change device states. ",
"Currently, plugin ", fDeviceController, " has taken control."
)};
}
}
auto PluginServices::TakeDeviceControl(const std::string& controller) -> void
{
lock_guard<mutex> lock{fDeviceControllerMutex};
if(!fDeviceController)
{
fDeviceController = controller;
}
else if(fDeviceController == controller)
{
// nothing to do
}
else
{
throw DeviceControlError{tools::ToString(
"Plugin ", controller, " is not allowed to take over control. ",
"Currently, plugin ", fDeviceController, " has taken control."
)};
}
}
auto PluginServices::ReleaseDeviceControl(const std::string& controller) -> void
{
{
lock_guard<mutex> lock{fDeviceControllerMutex};
if(fDeviceController == controller)
{
fDeviceController = boost::none;
}
else
{
throw DeviceControlError{tools::ToString(
"Plugin ", controller, " cannot release control because it has not taken over control."
)};
}
}
fReleaseDeviceControlCondition.notify_one();
}
auto PluginServices::GetDeviceController() const -> boost::optional<std::string>
{
lock_guard<mutex> lock{fDeviceControllerMutex};
return fDeviceController;
}
auto PluginServices::WaitForReleaseDeviceControl() -> void
{
unique_lock<mutex> lock{fDeviceControllerMutex};
fReleaseDeviceControlCondition.wait(lock, [&]{ return !GetDeviceController(); });
}