Realm DataStore

DataStore.swift

import Foundation
import RealmSwift

public struct DataStore
{
    public static let sharedInstance: DataStore = DataStore()
    
    private (set) var writeQueue = dispatch_queue_create("nl.mayainteractive.project.realm.write", DISPATCH_QUEUE_SERIAL)
    
    private (set) var mainRealm = try! Realm()
    
    public init()
    {}
    
    private func performWriteBlock(writeBlock: (backgroundRealm:Realm) -> Void)
    {
        dispatch_async(self.writeQueue) {
            autoreleasepool {
                do {
                    let realm = try Realm()

                    try realm.write() {
                        writeBlock(backgroundRealm: realm)
                        try realm.commitWrite()
                    }
                } catch let error as NSError {
                    NSLog("DB Error: \(error.localizedDescription)")
                } catch {
                    NSLog("DB Error: Generic Error")
                }
            }
        }
    }

    public func retrieveSomething() -> Results<SomeDomainModel>
    {
        return self.mainRealm.objects(SomeDomainModel.self)
    }

    public func storeSomething(something: SomeDomainModel)
    {
        performWriteBlock
        {
            (backgroundRealm) in
    
            backgroundRealm.add(something, update: true)
        }
    }
}