425 lines
12 KiB
C++
425 lines
12 KiB
C++
// Written by David Megginson, started 2000-12
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//
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// Copyright (C) 2000 David Megginson, david@megginson.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (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, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// 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, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifndef __SUBSYSTEM_MGR_HXX
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#define __SUBSYSTEM_MGR_HXX 1
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#include <simgear/compiler.h>
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#include <string>
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#include <map>
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#include <vector>
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#include <simgear/timing/timestamp.hxx>
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#include <simgear/structure/SGSharedPtr.hxx>
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#include <simgear/misc/strutils.hxx>
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class TimingInfo
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{
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private:
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std::string eventName;
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SGTimeStamp time;
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public:
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TimingInfo(const std::string& name, const SGTimeStamp &t) :
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eventName(name), time(t)
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{ }
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const std::string& getName() const { return eventName; }
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const SGTimeStamp& getTime() const { return time; }
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};
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class SampleStatistic;
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typedef std::vector<TimingInfo> eventTimeVec;
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typedef std::vector<TimingInfo>::iterator eventTimeVecIterator;
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typedef void (*SGSubsystemTimingCb)(void* userData, const std::string& name, SampleStatistic* pStatistic);
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/**
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* Basic interface for all FlightGear subsystems.
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*
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* <p>This is an abstract interface that all FlightGear subsystems
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* will eventually implement. It defines the basic operations for
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* each subsystem: initialization, property binding and unbinding, and
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* updating. Interfaces may define additional methods, but the
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* preferred way of exchanging information with other subsystems is
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* through the property tree.</p>
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*
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* <p>To publish information through a property, a subsystem should
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* bind it to a variable or (if necessary) a getter/setter pair in the
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* bind() method, and release the property in the unbind() method:</p>
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*
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* <pre>
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* void MySubsystem::bind ()
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* {
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* fgTie("/controls/flight/elevator", &_elevator);
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* fgSetArchivable("/controls/flight/elevator");
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* }
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*
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* void MySubsystem::unbind ()
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* {
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* fgUntie("/controls/flight/elevator");
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* }
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* </pre>
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*
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* <p>To reference a property (possibly) from another subsystem, there
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* are two alternatives. If the property will be referenced only
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* infrequently (say, in the init() method), then the fgGet* methods
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* declared in fg_props.hxx are the simplest:</p>
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*
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* <pre>
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* void MySubsystem::init ()
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* {
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* _errorMargin = fgGetFloat("/display/error-margin-pct");
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* }
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* </pre>
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*
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* <p>On the other hand, if the property will be referenced frequently
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* (say, in the update() method), then the hash-table lookup required
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* by the fgGet* methods might be too expensive; instead, the
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* subsystem should obtain a reference to the actual property node in
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* its init() function and use that reference in the main loop:</p>
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*
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* <pre>
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* void MySubsystem::init ()
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* {
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* _errorNode = fgGetNode("/display/error-margin-pct", true);
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* }
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*
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* void MySubsystem::update (double delta_time_sec)
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* {
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* do_something(_errorNode.getFloatValue());
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* }
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* </pre>
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*
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* <p>The node returned will always be a pointer to SGPropertyNode,
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* and the subsystem should <em>not</em> delete it in its destructor
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* (the pointer belongs to the property tree, not the subsystem).</p>
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*
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* <p>The program may ask the subsystem to suspend or resume
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* sim-time-dependent operations; by default, the suspend() and
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* resume() methods set the protected variable <var>_suspended</var>,
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* which the subsystem can reference in its update() method, but
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* subsystems may also override the suspend() and resume() methods to
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* take different actions.</p>
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*/
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class SGSubsystem : public SGReferenced
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{
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public:
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/**
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* Default constructor.
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*/
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SGSubsystem ();
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/**
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* Virtual destructor to ensure that subclass destructors are called.
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*/
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virtual ~SGSubsystem ();
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/**
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* Initialize the subsystem.
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*
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* <p>This method should set up the state of the subsystem, but
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* should not bind any properties. Note that any dependencies on
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* the state of other subsystems should be placed here rather than
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* in the constructor, so that FlightGear can control the
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* initialization order.</p>
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*/
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virtual void init ();
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typedef enum
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{
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INIT_DONE, ///< subsystem is fully initialised
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INIT_CONTINUE ///< init should be called again
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} InitStatus;
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virtual InitStatus incrementalInit ();
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/**
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* Initialize parts that depend on other subsystems having been initialized.
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*
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* <p>This method should set up all parts that depend on other
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* subsystems. One example is the scripting/Nasal subsystem, which
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* is initialized last. So, if a subsystem wants to execute Nasal
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* code in subsystem-specific configuration files, it has to do that
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* in its postinit() method.</p>
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*/
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virtual void postinit ();
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/**
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* Reinitialize the subsystem.
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*
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* <p>This method should cause the subsystem to reinitialize itself,
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* and (normally) to reload any configuration files.</p>
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*/
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virtual void reinit ();
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/**
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* Shutdown the subsystem.
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*
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* <p>Release any state associated with subsystem. Shutdown happens in
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* the reverse order to init(), so this is the correct place to do
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* shutdown that depends on other subsystems.
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* </p>
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*/
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virtual void shutdown ();
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/**
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* Acquire the subsystem's property bindings.
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*
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* <p>This method should bind all properties that the subsystem
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* publishes. It will be invoked after init, but before any
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* invocations of update.</p>
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*/
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virtual void bind ();
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/**
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* Release the subsystem's property bindings.
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*
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* <p>This method should release all properties that the subsystem
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* publishes. It will be invoked by FlightGear (not the destructor)
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* just before the subsystem is removed.</p>
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*/
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virtual void unbind ();
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/**
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* Update the subsystem.
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*
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* <p>FlightGear invokes this method every time the subsystem should
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* update its state.</p>
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*
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* @param delta_time_sec The delta time, in seconds, since the last
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* update. On first update, delta time will be 0.
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*/
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virtual void update (double delta_time_sec) = 0;
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/**
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* Suspend operation of this subsystem.
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*
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* <p>This method instructs the subsystem to suspend
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* sim-time-dependent operations until asked to resume. The update
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* method will still be invoked so that the subsystem can take any
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* non-time-dependent actions, such as updating the display.</p>
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*
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* <p>It is not an error for the suspend method to be invoked when
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* the subsystem is already suspended; the invocation should simply
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* be ignored.</p>
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*/
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virtual void suspend ();
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/**
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* Suspend or resume operation of this subsystem.
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*
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* @param suspended true if the subsystem should be suspended, false
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* otherwise.
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*/
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virtual void suspend (bool suspended);
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/**
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* Resume operation of this subsystem.
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*
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* <p>This method instructs the subsystem to resume
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* sim-time-depended operations. It is not an error for the resume
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* method to be invoked when the subsystem is not suspended; the
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* invocation should simply be ignored.</p>
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*/
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virtual void resume ();
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/**
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* Test whether this subsystem is suspended.
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*
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* @return true if the subsystem is suspended, false if it is not.
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*/
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virtual bool is_suspended () const;
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/**
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* Trigger the callback to report timing information for all subsystems.
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*/
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void reportTiming(void);
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/**
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* Place time stamps at strategic points in the execution of subsystems
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* update() member functions. Predominantly for debugging purposes.
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*/
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void stamp(const std::string& name);
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protected:
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bool _suspended;
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eventTimeVec timingInfo;
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static SGSubsystemTimingCb reportTimingCb;
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static void* reportTimingUserData;
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};
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typedef SGSharedPtr<SGSubsystem> SGSubsystemRef;
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/**
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* A group of FlightGear subsystems.
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*/
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class SGSubsystemGroup : public SGSubsystem
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{
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public:
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SGSubsystemGroup ();
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virtual ~SGSubsystemGroup ();
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virtual void init();
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virtual InitStatus incrementalInit ();
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virtual void postinit ();
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virtual void reinit ();
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virtual void shutdown ();
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virtual void bind ();
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virtual void unbind ();
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virtual void update (double delta_time_sec);
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virtual void suspend ();
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virtual void resume ();
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virtual bool is_suspended () const;
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virtual void set_subsystem (const std::string &name,
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SGSubsystem * subsystem,
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double min_step_sec = 0);
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virtual SGSubsystem * get_subsystem (const std::string &name);
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virtual void remove_subsystem (const std::string &name);
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virtual bool has_subsystem (const std::string &name) const;
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/**
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* Remove all subsystems.
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*/
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virtual void clearSubsystems();
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void reportTiming(void);
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/**
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*
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*/
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void set_fixed_update_time(double fixed_dt);
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/**
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* retrive list of member subsystem names
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*/
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string_list member_names() const;
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private:
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class Member;
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Member* get_member (const std::string &name, bool create = false);
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typedef std::vector<Member *> MemberVec;
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MemberVec _members;
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double _fixedUpdateTime;
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double _updateTimeRemainder;
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/// index of the member we are currently init-ing
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unsigned int _initPosition;
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};
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/**
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* Manage subsystems for FlightGear.
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*
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* This top-level subsystem will eventually manage all of the
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* subsystems in FlightGear: it broadcasts its life-cycle events
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* (init, bind, etc.) to all of the subsystems it manages. Subsystems
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* are grouped to guarantee order of initialization and execution --
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* currently, the only two groups are INIT and GENERAL, but others
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* will appear in the future.
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*
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* All subsystems are named as well as grouped, and subsystems can be
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* looked up by name and cast to the appropriate subtype when another
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* subsystem needs to invoke specialized methods.
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*
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* The subsystem manager owns the pointers to all the subsystems in
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* it.
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*/
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class SGSubsystemMgr : public SGSubsystem
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{
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public:
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/**
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* Types of subsystem groups.
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*/
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enum GroupType {
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INIT = 0,
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GENERAL,
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FDM, ///< flight model, autopilot, instruments that run coupled
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POST_FDM, ///< certain subsystems depend on FDM data
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DISPLAY, ///< view, camera, rendering updates
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SOUND/*I want to be last!*/, ///< needs to run AFTER display, to allow concurrent GPU/sound processing
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MAX_GROUPS
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};
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SGSubsystemMgr ();
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virtual ~SGSubsystemMgr ();
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virtual void init ();
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virtual InitStatus incrementalInit ();
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virtual void postinit ();
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virtual void reinit ();
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virtual void shutdown ();
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virtual void bind ();
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virtual void unbind ();
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virtual void update (double delta_time_sec);
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virtual void suspend ();
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virtual void resume ();
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virtual bool is_suspended () const;
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virtual void add (const char * name,
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SGSubsystem * subsystem,
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GroupType group = GENERAL,
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double min_time_sec = 0);
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/**
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* remove a subsystem, and return a pointer to it.
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* returns NULL if the subsystem was not found.
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*/
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virtual void remove(const char* name);
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virtual SGSubsystemGroup * get_group (GroupType group);
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virtual SGSubsystem* get_subsystem(const std::string &name) const;
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void reportTiming();
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void setReportTimingCb(void* userData,SGSubsystemTimingCb cb) {reportTimingCb = cb;reportTimingUserData = userData;}
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private:
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SGSubsystemGroup* _groups[MAX_GROUPS];
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unsigned int _initPosition;
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// non-owning reference
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typedef std::map<std::string, SGSubsystem*> SubsystemDict;
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SubsystemDict _subsystem_map;
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};
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#endif // __SUBSYSTEM_MGR_HXX
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