ScriptInitializerMixin.h

//
//  ScriptInitializerMixin.h
//  libraries/shared/src/shared
//
//  Copyright 2018 High Fidelity, Inc.
//  Copyright 2023 Overte e.V.
//
//  Distributed under the Apache License, Version 2.0.
//  SPDX-License-Identifier: Apache-2.0
//
 
#pragma once
 
#include <functional>
#include <mutex>
#include "../DependencyManager.h"
 
class ScriptEngine;
 
template <typename T> class ScriptInitializerMixin {
public:
    using ScriptInitializer = std::function<void(T)>;
    virtual void registerScriptInitializer(ScriptInitializer initializer) {
        InitializerLock lock(_scriptInitializerMutex);
        _scriptInitializers.push_back(initializer);
    }
    virtual int runScriptInitializers(T engine) {
        InitializerLock lock(_scriptInitializerMutex);
        return std::count_if(_scriptInitializers.begin(), _scriptInitializers.end(),
            [engine](auto initializer){ initializer(engine); return true; }
        );
    }
    virtual ~ScriptInitializerMixin() {}
protected:
    std::mutex _scriptInitializerMutex;
    using InitializerLock = std::lock_guard<std::mutex>;
    std::list<ScriptInitializer> _scriptInitializers;
};
 
class ScriptInitializers : public ScriptInitializerMixin<ScriptEngine*>, public Dependency {
public:
    // Lightweight `ScriptEngine*` initializer (only depends on built-in Qt components)
    // example registration:
    // eg: [&](ScriptEngine* engine) {
    //     engine->globalObject().setProperties("API", engine->newQObject(...instance...))
    // };
};