Lumiera  0.pre.03
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DummyPlayerSubsysDescriptor Class Reference

Description

details of how the DummyPlayer service can be started and used as independent "subsystem" within main()

Definition at line 50 of file dummy-player-service.cpp.

Private Types

using ServiceHandle = lib::DependInject< DummyPlayerService >::ServiceInstance<>
 

Private Member Functions

bool checkRunningState () noexcept override
 whether this subsystem is actually operational. More...
 
 operator string () const
 a human readable name
 
bool shouldStart (lumiera::Option &) override
 query application option state to determine if this subsystem should be activated. More...
 
bool start (lumiera::Option &, Subsys::SigTerm terminationHandle) override
 attempt to bring up this subsystem up. More...
 
void triggerShutdown () noexcept override
 initiate termination of this subsystem. More...
 

Private Attributes

ServiceHandle thePlayer_ {ServiceHandle::NOT_YET_STARTED}
 manages the actual (single) instance of the player service impl
 

Additional Inherited Members

- Public Types inherited from Subsys
typedef function< void(string *)> SigTerm
 
- Public Member Functions inherited from Subsys
Subsysdepends (Subsys &prereq)
 define a dependency to another Subsys required for running this subsystem
 
const std::vector< Subsys * > getPrerequisites ()
 
bool isRunning () noexcept
 

Member Function Documentation

◆ shouldStart()

bool shouldStart ( lumiera::Option )
inlineoverrideprivatevirtual

query application option state to determine if this subsystem should be activated.

Note
even if not started explicitly, it could still be started as prerequisite of another one

Implements Subsys.

Definition at line 63 of file dummy-player-service.cpp.

◆ start()

bool start ( lumiera::Option options,
Subsys::SigTerm   
)
inlineoverrideprivatevirtual

attempt to bring up this subsystem up.

On return, the subsystem must be operational, according to checkRunningState(). Failure to start up usually terminates the whole application. When this subsystem ceases to work, it must ensure to activate the given callback signal.

Parameters
optionsmay be influencing the operation mode
SigTermto be signalled by the subsystem.
Warning
termination must be signalled reliably.
Returns
true if actually started.

Implements Subsys.

Definition at line 69 of file dummy-player-service.cpp.

◆ triggerShutdown()

void triggerShutdown ( )
inlineoverrideprivatevirtualnoexcept

initiate termination of this subsystem.

This trigger may be called repeatedly any time... When the subsystem actually has terminated, the SigTerm passed to start must be invoked.

Note
called within a locked context (barrier)
Warning
must not block nor throw.

Implements Subsys.

Definition at line 78 of file dummy-player-service.cpp.

◆ checkRunningState()

bool checkRunningState ( )
inlineoverrideprivatevirtualnoexcept

whether this subsystem is actually operational.

When returning false here, the application may terminate at any point without further notice Note further, that a subsystem must not be in running state when signalling termination.

Implements Subsys.

Definition at line 86 of file dummy-player-service.cpp.

+ Inheritance diagram for DummyPlayerSubsysDescriptor:
+ Collaboration diagram for DummyPlayerSubsysDescriptor:

The documentation for this class was generated from the following file: