OpenSimMirror/OpenSim/Region/Environment/ModuleLoader.cs

/*
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*       derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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*/

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using Nini.Config;
using OpenSim.Framework.Console;
using OpenSim.Region.Environment.Interfaces;
using OpenSim.Region.Environment.Modules;
using OpenSim.Region.Environment.Scenes;

namespace OpenSim.Region.Environment
{
    public class ModuleLoader
    {
        public Dictionary<string, Assembly> LoadedAssemblys = new Dictionary<string, Assembly>();

        private readonly List<IRegionModule> m_loadedModules = new List<IRegionModule>();
        private Dictionary<string, IRegionModule> m_loadedSharedModules = new Dictionary<string, IRegionModule>();
        private readonly LogBase m_log;
        private readonly IConfigSource m_config;

        public ModuleLoader(LogBase log, IConfigSource config)
        {
            m_log = log;
            m_config = config;
        }

        public IRegionModule[] GetLoadedSharedModules
        {
            get
            {
                IRegionModule[] regionModules = new IRegionModule[m_loadedSharedModules.Count];
                m_loadedSharedModules.Values.CopyTo(regionModules, 0);
                return regionModules;
            }
        }

        public void PickupModules(Scene scene, string moduleDir)
        {
            DirectoryInfo dir = new DirectoryInfo(moduleDir);

            foreach (FileInfo fileInfo in dir.GetFiles("*.dll"))
            {
                LoadRegionModules(fileInfo.FullName, scene);
            }
        }

        public void LoadDefaultSharedModules()
        {
            DynamicTextureModule dynamicModule = new DynamicTextureModule();
            m_loadedSharedModules.Add(dynamicModule.Name, dynamicModule);

            ChatModule chat = new ChatModule();
            m_loadedSharedModules.Add(chat.Name, chat);

            InstantMessageModule imMod = new InstantMessageModule();
            m_loadedSharedModules.Add(imMod.Name, imMod);

            LoadImageURLModule loadMod = new LoadImageURLModule();
            m_loadedSharedModules.Add(loadMod.Name, loadMod);

            AvatarFactoryModule avatarFactory = new AvatarFactoryModule();
            m_loadedSharedModules.Add(avatarFactory.Name, avatarFactory);

            XMLRPCModule xmlRpcMod = new XMLRPCModule();
            m_loadedSharedModules.Add(xmlRpcMod.Name, xmlRpcMod);

            //TextureDownloadModule textureModule = new TextureDownloadModule();
            //LoadedSharedModules.Add(textureModule.Name, textureModule);
        }

        public void InitialiseSharedModules(Scene scene)
        {
            foreach (IRegionModule module in m_loadedSharedModules.Values)
            {
                module.Initialise(scene, m_config);
                scene.AddModule(module.Name, module); //should be doing this?
            }
        }

        public void InitializeModule(IRegionModule module, Scene scene)
        {
            module.Initialise(scene, m_config);
            scene.AddModule(module.Name, module);
            m_loadedModules.Add(module);
        }

        /// <summary>
        ///  Loads/initialises a Module instance that can be used by mutliple Regions
        /// </summary>
        /// <param name="dllName"></param>
        /// <param name="moduleName"></param>
        /// <param name="scene"></param>
        public void LoadSharedModule(string dllName, string moduleName)
        {
            IRegionModule module = LoadModule(dllName, moduleName);
            if (module != null)
            {
                if (!m_loadedSharedModules.ContainsKey(module.Name))
                {
                    m_loadedSharedModules.Add(module.Name, module);
                }
            }
        }

        public void LoadRegionModules(string dllName, Scene scene)
        {
            IRegionModule[] modules = LoadModules(dllName);

            if (modules.Length > 0)
            {
                m_log.Verbose("MODULES", "Found Module Library [{0}]", dllName);
                foreach (IRegionModule module in modules)
                {
                    if (!module.IsSharedModule)
                    {
                        m_log.Verbose("MODULES", "   [{0}]: Initializing.", module.Name);
                        InitializeModule(module, scene);
                    }
                    else
                    {
                        m_log.Verbose("MODULES", "   [{0}]: Loading Shared Module.", module.Name);
                        LoadSharedModule(dllName, module.Name);
                    }
                }
            }
        }

        public void LoadRegionModule(string dllName, string moduleName, Scene scene)
        {
            IRegionModule module = LoadModule(dllName, moduleName);
            if (module != null)
            {
                InitializeModule(module, scene);
            }
        }

        /// <summary>
        /// Loads a external Module (if not already loaded) and creates a new instance of it.
        /// </summary>
        /// <param name="dllName"></param>
        /// <param name="moduleName"></param>
        /// <param name="scene"></param>
        public IRegionModule LoadModule(string dllName, string moduleName)
        {
            IRegionModule[] modules = LoadModules(dllName);

            foreach (IRegionModule module in modules)
            {
                if ((module != null) && (module.Name == moduleName))
                {
                    return module;
                }
            }

            return null;
        }

        public IRegionModule[] LoadModules(string dllName)
        {
            List<IRegionModule> modules = new List<IRegionModule>();

            Assembly pluginAssembly;
            if (!LoadedAssemblys.TryGetValue(dllName, out pluginAssembly))
            {
                try
                {
                    pluginAssembly = Assembly.LoadFrom(dllName);
                    LoadedAssemblys.Add(dllName, pluginAssembly);
                }
                catch (BadImageFormatException)
                {
                    //m_log.Verbose("MODULES", "The file [{0}] is not a module assembly.", e.FileName);
                }
            }


            if (pluginAssembly != null)
            {
                try
                {
                    foreach (Type pluginType in pluginAssembly.GetTypes())
                    {
                        if (pluginType.IsPublic)
                        {
                            if (!pluginType.IsAbstract)
                            {
                                if (pluginType.GetInterface("IRegionModule") != null)
                                {
                                    modules.Add((IRegionModule)Activator.CreateInstance(pluginType));
                                }
                            }
                        }
                    }
                }
                catch( ReflectionTypeLoadException )
                {
                    m_log.Verbose("MODULES", "Could not load types for [{0}].", pluginAssembly.FullName );
                }
            }

            return modules.ToArray();
        }

        public void PostInitialise()
        {
            foreach (IRegionModule module in m_loadedSharedModules.Values)
            {
                module.PostInitialise();
            }

            foreach (IRegionModule module in m_loadedModules)
            {
                module.PostInitialise();
            }
        }

        public void ClearCache()
        {
            LoadedAssemblys.Clear();
        }
    }
}