领域数据库Swift 3.1的设计模式-Singleton [英] Design Pattern for Realm Database Swift 3.1 - Singleton

问题描述

我正在研究 RealmSwift ，它是Swift中CoreData/SQLite的现代数据库替代.

I'm working on RealmSwift, which is a modern database replacement of CoreData/SQLite in Swift.

我想知道如何实现Class的设计，该设计可以管理/处理 RealmSwift框架的所有查询

I'm wondering how to implement a design for a Class which can manage/handle all the queries for RealmSwift Framework

此问题与实现SQLite Model Manager相似，但适用于RealmSwift.

This question is somewhat similar to implementing SQLite Model Manager but for RealmSwift.

具体来说，我不需要上面提到的单例对象/实例.

Specifically I don't require a singleton object/instance mention above.

推荐答案

Realm有一个相当聪明的内部缓存系统，每次let realm = try! Realm()之类的调用发生时，Realm的先前实例都会保留并回收.因此，这实际上不是必需的，也不建议尝试将Realm实例本身合并为一个单例.

Realm has a rather clever internal caching system where previous instances of Realm are held onto and recycled each time a call like let realm = try! Realm() occurs. As such, it's not really necessary, nor recommended to try and incorporate a Realm instance itself into a singleton.

如果要大量自定义Realm实例的设置，通常可以通过Realm Configuration对象来实现，该对象是静态的并且是线程安全的.如果是这种情况，那么在需要创建新的Realm实例时，最好有一个单例(甚至只是静态类方法)返回适当的Configuration对象.

If you want to heavily customise your Realm instance's settings, you'll normally do that through a Realm Configuration object, which is static and thread-safe. If that's the case, it would be more appropriate to have a singleton (or even just a static class method) that returns the appropriate Configuration object when you need to create a new Realm instance.

swift中的东西上有关于如何在Swift中创建单例的页面，它实质上只是类的单个静态属性实施:

that thing in swift has a page on how to create singletons in Swift, and it's essentially just a single static property of a class implementation:

class SomeManager {
    static let sharedInstance = SomeManager()
}

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