Save Load Docs

Overview

The Runtime Save & Load (RTSL) subsystem is required for saving and managing scenes, assets and projects at runtime and consists of three main parts:

• Persistent Classes - this part allows you to choose what to serialize and generate persistent classes for serialization.
• Asset Libraries - this part allows you to create and manage assets, as well as provide information to the RTSL to identify these assets.
• Project - this part provides api to interact with RTSL.

Getting Started

After importing RTSL you will see the configuration window:

After clicking "Build All", several folders will be created under /Battlehub/RTSL_Data

• Scripts for serializable persistent classes.
• Custom Implementation for user defined persistent classes.
• Mappings for mappings between types that must be stored and serializable persistent types.
• Libraries for asset libraries and shader profiles.

1. Create a new scene.

2. Drag and Drop Assets/Battlehub/RTEditorDemo/Content/Runtime/RTEditor/DemoGame/
   Prefabs/Game.prefab to hierarchy.

   
   
   

3. Click Tools->Runtime SaveLoad->Update Libraries

   
   
   

4. Create a new Game Object, then add Assets/Battlehub/RTEditor/Runtime/RTSL/Project/Project, Assets/Battlehub/RTEditor/Runtime/RTSL/RTSLDeps, Assets/Battlehub/RTEditor/Runtime/RTSL/Interface/RTSLIgnore components.

   
   
   

5. Create RTSLExample script and add it to the Game Object created at previous step.

6. Hit play.
7. Save scene using 'M' key.
8. Load scene using 'L' key.

using System.Collections;

using UnityEngine;
using UnityEngine.SceneManagement;

using Battlehub.RTCommon;
using Battlehub.RTSL.Interface;


public class RTSLExample : MonoBehaviour
{
    IProject m_project;

    IEnumerator Start()
    {
        m_project = IOC.Resolve<IProject>();

        yield return m_project.OpenProject("My Project");
        yield return m_project.CreateFolder("Scenes/Demo");           
    }

    IEnumerator SaveScene()
    {
        ProjectAsyncOperation ao = m_project.Save("Scenes/Demo/Scene", SceneManager.GetActiveScene());
        yield return ao;

        if(ao.Error.HasError)
        {
            Debug.LogError(ao.Error.ToString());
        }
    }

    IEnumerator LoadScene()
    {
        ProjectAsyncOperation ao = m_project.Load<Scene>("Scenes/Demo/Scene");
        yield return ao;

        if (ao.Error.HasError)
        {
            Debug.LogError(ao.Error.ToString());
        }
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.M))
        {
            StartCoroutine(SaveScene());
        }

        if (Input.GetKeyDown(KeyCode.L))
        {   
            if (m_project.Exist<Scene>("Scenes/Demo/Scene"))
            {
                StartCoroutine(LoadScene());
            }
        }
    }
}

Saved scene can be found in PersistentDataPath/My Project/Assets/Scenes/Demo folder.

Persistent Classes

Persistent Class is a class derived from Persistent Surrogate and has the [ProtoContract] attribute . The main purpose of persistent classes is to give you complete control over what to save and how to save, without having to use reflection and without writing a lot of boilerplate code.

To open persistent classes editor, click Tools->Runtime SaveLoad->Persistent Classes->Edit.

Here is the persistent classes editor window:

This window allow you:

• Search for types you want to save.
• Select properties you want to save.
• Generate C# code of persistent classes.

After clicking the "Create Persistent Classes" button the following will occur:

1. Persistent classes will be created in Assets/Battlehub/RTSL_Data/Scripts/PersistentClasses.

   
   
   

2. The editor window state will be saved in Assets/Battlehub/RTSL_Data/Mappings/Editor.

   
   
   

3. Custom Implementations will be created in .../RTSL_Data/Scripts/CustomImplementation.

   
   
   

How To: Create Custom Persistent Class

In some cases, it is not possible to obtain all data to be saved using public properties and fields. For example, some data can only be retrieved using methods. If you need to write your own code to save and load data, follow these steps:

1. Open Persistent Classes Editor.
2. Find and select required type.

3. Select "Custom Implementation"

   
   
   

4. Click Create Persistent Classes button.

5. Click Edit Custom Implementation button.

   
   
   

6. You should see following:

#if !RTSL_MAINTENANCE
using Battlehub.RTSL;
namespace UnityEngine.Battlehub.SL2
{
    [CustomImplementation]
    public partial class PersistentJoint<TID>
    {
        /*
        public override void ReadFrom(object obj)
        {
            base.ReadFrom(obj);
        }

        public override object WriteTo(object obj)
        {
            return base.WriteTo(obj);
        }

        public override void GetDeps(GetDepsContext<TID> context)
        {
            base.GetDeps(context);
        }

        public override void GetDepsFrom(object obj, GetDepsFromContext context)
        {
            base.GetDepsFrom(obj, context);
        }
        */
    }
}
#endif

There are four methods that can be implemented:

• void ReadFrom(object obj) - called before serialization. Read the data from obj and save it to the fields of the persistent object.
• object WriteTo(object obj) - called after deserialization. Write stored data to obj.
• void GetDeps(GetDepsContext<TID> context) - return IDs of dependencies.
• void GetDepsFrom(object obj, GetDepsFromContext context) - get dependencies from obj.

Implementation of PersistentJoint may look like this:

#if !RTSL_MAINTENANCE
using Battlehub.RTSL;
namespace UnityEngine.Battlehub.SL2
{
    [CustomImplementation]
    public partial class PersistentJoint<TID>
    {
        [ProtoBuf.ProtoMember(1)]
        private TID m_connectedBody;

        [ProtoBuf.ProtoMember(2)]
        private PersistentVector3<TID> m_anchor;

        //..... more fields

        public override void ReadFrom(object obj)
        {
            base.ReadFrom(obj);

            Joint joint = (Joint)obj;
            if (joint == null)
            {
                return;
            }

            m_connectedBody = ToID(joint.connectedBody);
            m_anchor = joint.anchor;

            //... read other fields
        }

        public override object WriteTo(object obj)
        {
            obj = base.WriteTo(obj);

            Joint joint = (Joint)obj;
            if (joint == null)
            {
                return obj;
            }

            joint.connectedBody = FromID<Rigidbody>(m_connectedBody);
            joint.anchor = m_anchor;

            //... write other fields

            return joint;
        }

        public override void GetDeps(GetDepsContext<TID> context)
        {
            base.GetDeps(context);

            AddDep(m_connectedBody, context);

            //... get other dependencies
        }

        public override void GetDepsFrom(object obj, GetDepsFromContext context)
        {
            base.GetDepsFrom(obj, context);

            Joint joint = (Joint)obj;
            if (joint == null)
            {
                return;
            }

            AddDep(joint.connectedBody, context);

            //... get other dependencies
        }
    }
}
#endif

Asset Library

Game objects in any scene refer assets such as materials, meshes, textures, etc. Identifiers of these assets obtained using GetInstanceID() method do not remain constant and can change.
Asset libraries, in contrast, are used to store unique asset identifiers that never change.

There are two special asset libraries:

• Built-in asset library - contains Unity build-in assets.
• Scene asset library - contains assets referenced by scene Game Objects.

Both libraries created automatically by clicking Tools->Runtime SaveLoad->Update Libraries

How To: Create Asset Library

If the built-in asset library and scene dependency library are not sufficient, and the new resources must be Resource.Loaded at runtime, you can create a new asset library by clicking
Create-> Runtime Asset Library in the context menu.

Use drag & drop to add assets to asset library

If you change hierarchy of one or more prefabs, you will be asked to synchronize the assets library. Do it by clicking Synchronize button.

Project Item & Asset Item

Project Items are used to create tree structures representing the project tree.

       [ProtoContract]
    [ProtoInclude(1, typeof(AssetItem))]
    public class ProjectItem
    {
        [ProtoMember(2)]
        public long ItemID;

        [ProtoMember(3)]
        public Guid ItemGUID;

        public string Name;
        public string Ext;

        public ProjectItem Parent;
        public List<ProjectItem> Children;

        // ...

Asset Items are meta representations of assets in a project. They are stored in *.rtmeta files.

    [ProtoContract]
    public class AssetItem : ProjectItem
    {
        public event EventHandler PreviewDataChanged;

        [ProtoMember(1)]
        public Guid TypeGuid;

        [ProtoMember(2)]
        public PrefabPart[] Parts;

        [ProtoMember(3)]
        public long[] Dependencies;

        [ProtoMember(4, IsRequired = true)]
        public long CustomDataOffset = -1;

        [ProtoMember(5)]
        public Guid[] DependenciesGuids;


        private Preview m_preview;
        public Preview Preview
        {
            get { return m_preview; }
            set
            {
                if (m_preview != value)
                {
                    m_preview = value;
                    if (PreviewDataChanged != null)
                    {
                        PreviewDataChanged(this, EventArgs.Empty);
                    }
                }
            }
        }

        public override bool IsFolder
        {
            get { return false; }
        }

    }

Project

IProject is the main interface of the RTSL library. Here is how to access it:

using Battlehub.RTCommon;
using Battlehub.RTSL.Interface;

void Awake()
{
    IProject project = IOC.Resolve<IProject>();
}

Open project:

using System.Collections;
using Battlehub.RTCommon;
using Battlehub.RTSL.Interface;

IEnumerator Start()
{
    IProject project = IOC.Resolve<IProject>();
    yield return project.OpenProject("My Project");
}

Close project:

m_project.CloseProject();

Delete project:

yield return project.DeleteProject("My Project");

Create folder:

yield return project.CreateFolder("My Scenes");   

Delete folder:

yield return project.DeleteFolder("My Scenes");

Save scene:

using System.Collections;

using UnityEngine;
using UnityEngine.SceneManagement;

using Battlehub.RTCommon;
using Battlehub.RTSL.Interface;

IEnumerator Start()
{
    //...

    ProjectAsyncOperation ao = project.Save("My Scenes/Scene 1", SceneManager.GetActiveScene());
    yield return ao;

    if (ao.Error.HasError)
    {
        Debug.LogError(ao.Error.ToString());
    }
}

Load scene:

using System.Collections;

using UnityEngine;
using UnityEngine.SceneManagement;

using Battlehub.RTCommon;
using Battlehub.RTSL.Interface;

IEnumerator Start()
{
    //...

    ProjectAsyncOperation ao = project.Load<Scene>("My Scenes/Scene 1");
    yield return ao;

    if (ao.Error.HasError)
    {
        Debug.LogError(ao.Error.ToString());
    }
}

Delete scene:

yield return project.Delete<Scene>("My Scenes/Scene 1");

Find objects of type:

foreach(string scene in project.Find<Scene>("Scene 1"))
{
    Debug.Log(scene);
}

Create Prefab:

GameObject primitive = GameObject.CreatePrimitive(PrimitiveType.Capsule);
yield return project.Save("Capsule", primitive);
Destroy(primitive);

Load and instantiate Prefab:

ProjectAsyncOperation<Object[]> ao = project.Load<GameObject>("Capsule");
yield return ao;

if(!ao.Error.HasError)
{
    Instantiate(ao.Result[0]);
}

Import all assets from asset bundle:

//get names of asset bundles from Assets/StreamingAssets folder.
ProjectAsyncOperation<string[]> ao = project.GetAssetBundles();
yield return ao;

//load ImportItems from first asset bundle
ProjectAsyncOperation<ProjectItem> loadAo = project.LoadImportItems(ao.Result[0], false);
yield return loadAo;


if (!loadAo.Error.HasError)
{
    //create previews here...
    //then unload asset bundle assets
    project.UnloadImportItems(loadAo.Result);

    //import all
    yield return project.Import(loadAo.Result.Flatten(true).OfType<ImportItem>().ToArray());
}

//log all asset items in project
foreach(string path in project.Find<object>(string.Empty, true))
{
    Debug.Log(path);
}