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/*
* Copyright (C) 2009-2010 Michael 'Mickey' Lauer <mlauer@vanille-media.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
using GLib;
internal const string FSO_REGISTER_FUNCTION = "fso_register_function";
internal const string FSO_FACTORY_FUNCTION = "fso_factory_function";
internal const string FSO_SHUTDOWN_FUNCTION = "fso_shutdown_function";
/**
* Errors
*/
public errordomain FsoFramework.PluginError
{
UNABLE_TO_LOAD,
REGISTER_NOT_FOUND,
FACTORY_NOT_FOUND,
UNABLE_TO_INITIALIZE,
}
/**
* Delegates
*/
[CCode (has_target = false)]
public delegate void FsoFramework.RegisterFunc( TypeModule bar );
[CCode (has_target = false)]
public delegate string FsoFramework.FactoryFunc( FsoFramework.Subsystem subsystem ) throws Error;
[CCode (has_target = false)]
public delegate void FsoFramework.ShutdownFunc();
/**
* PluginInfo
*/
public struct FsoFramework.PluginInfo
{
public string name;
public bool loaded;
}
/**
* Plugin
*/
public abstract interface FsoFramework.Plugin : Object
{
public abstract void loadAndInit() throws FsoFramework.PluginError;
public abstract PluginInfo info();
public abstract void shutdown();
}
/**
* BasePlugin
*/
public class FsoFramework.BasePlugin : FsoFramework.Plugin, TypeModule
{
string filename;
Module module;
FsoFramework.PluginInfo pluginInfo;
FsoFramework.Subsystem subsystem;
public BasePlugin( string filename, FsoFramework.Subsystem subsystem )
{
this.filename = "%s.%s".printf( filename, Module.SUFFIX );
this.subsystem = subsystem;
pluginInfo = FsoFramework.PluginInfo() { name=null, loaded=false };
// FIXME: bump ref so it doesn't get disposed. This works around a bug in
// Vala -- removing an unsolicitated call to g_object_dispose in TypeModule.
this.ref();
}
public void loadAndInit() throws FsoFramework.PluginError
{
// try to load it
module = Module.open( filename, ModuleFlags.BIND_LAZY | ModuleFlags.BIND_LOCAL );
if ( module == null )
{
throw new FsoFramework.PluginError.UNABLE_TO_LOAD( @"Could not load $filename: $(Module.error())" );
}
// try to resolve register method
void* regfunc;
var ok = module.symbol( FSO_REGISTER_FUNCTION, out regfunc );
if ( !ok )
{
throw new FsoFramework.PluginError.REGISTER_NOT_FOUND( @"Could not find symbol $FSO_REGISTER_FUNCTION: $(Module.error())" );
}
FsoFramework.RegisterFunc fso_register_function = (FsoFramework.RegisterFunc) regfunc;
fso_register_function( this );
// try to resolve factory method
void* loadfunc;
ok = module.symbol( FSO_FACTORY_FUNCTION, out loadfunc );
if ( !ok )
{
throw new FsoFramework.PluginError.FACTORY_NOT_FOUND( @"Could not find symbol $FSO_FACTORY_FUNCTION: $(Module.error())" );
}
FactoryFunc fso_factory_func = (FactoryFunc) loadfunc;
try
{
// call factory method to acquire name
pluginInfo.name = fso_factory_func( subsystem );
// flag as loaded
pluginInfo.loaded = true;
}
catch ( Error e )
{
module = null;
throw new FsoFramework.PluginError.UNABLE_TO_INITIALIZE( @"Factory function returned error: $(e.message)" );
}
}
public PluginInfo info()
{
return pluginInfo;
}
public override bool load()
{
#if DEBUG
debug( @"$filename load (GType is in use)" );
#endif
return true;
}
public override void unload()
{
#if DEBUG
debug( @"$filename unload (GType is no longer in use)" );
#endif
}
public void shutdown()
{
if ( module == null )
{
return;
}
#if DEBUG
message( @"$filename shutdown" );
#endif
// try to resolve shutdown method
void* func;
var ok = module.symbol( FSO_SHUTDOWN_FUNCTION, out func );
if ( !ok )
{
return;
}
FsoFramework.ShutdownFunc fso_shutdown_function = (FsoFramework.ShutdownFunc) func;
fso_shutdown_function();
}
}
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