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Listing 7:
using System;
using System.Collections.Generic;
using UnityEngine;
/// <summary>
/// Simple service locator for <see cref="IApplicationService"/> instances.
/// </summary>
public class ServiceLocator
{
private ServiceLocator() { }
/// <summary>
/// currently registered services.
/// </summary>
private readonly Dictionary<string, IApplicationService> services = new Dictionary<string, IApplicationService>();
/// <summary>
/// Gets the currently active service locator instance.
/// </summary>
public static ServiceLocator Current { get; private set; }
/// <summary>
/// Initalizes the service locator with a new instance.
/// </summary>
public static void Initiailze()
{
Current = new ServiceLocator();
}
/// <summary>
/// Gets the service instance of the given type.
/// </summary>
/// <typeparam name="T">The type of the service to lookup.</typeparam>
/// <returns>The service instance.</returns>
public T Get<T>() where T : IApplicationService
{
string key = typeof(T).Name;
if (!services.ContainsKey(key))
{
Debug.LogError($"{key} not registered with {GetType().Name}");
throw new InvalidOperationException();
}
return (T)services[key];
}
/// <summary>
/// Registers the service with the current service locator.
/// </summary>
/// <typeparam name="T">Service type.</typeparam>
/// <param name="service">Service instance.</param>
public void Register<T>(T service) where T : IApplicationService
{
string key = typeof(T).Name;
if (services.ContainsKey(key))
{
Debug.LogError($"Attempted to register service of type {key} which is already registered with the {GetType().Name}.");
return;
}
services.Add(key, service);
}
/// <summary>
/// Unregisters the service from the current service locator.
/// </summary>
/// <typeparam name="T">Service type.</typeparam>
public void Unregister<T>() where T : IApplicationService
{
string key = typeof(T).Name;
if (!services.ContainsKey(key))
{
Debug.LogError($"Attempted to unregister service of type {key} which is not registered with the {GetType().Name}.");
return;
}
services.Remove(key);
}
}
Listing 9
using System.Collections.Generic;
using UnityEngine;
public class LevelService : MonoBehaviour, IApplicationService
{
public Level CurrentLevel;
private LevelService()
{
CurrentLevel = Level.Beginner;
}
public void NextLevel()
{
if (CurrentLevel != Level.Expert)
{
CurrentLevel++;
}
}
}
public enum Level
{
Beginner = 0,
Intermediate = 1,
Advanced = 2,
Expert = 3
}
Listing 10
using UnityEngine;
public class PlayerService : MonoBehaviour, IApplicationService
{
private Level currentLevel;
private LevelService currentLevelService;
public string PlayerName;
public int Score;
public void Awake()
{
currentLevelService = ServiceLocator.Current.Get<LevelService>();
currentLevel = currentLevelService.CurrentLevel;
}
public void PlayerReachesNextLevel()
{
currentLevelService.NextLevel();
}
}
Listing 11
using UnityEngine;
public class Bootstrapper : MonoBehaviour
{
public void Initiailze()
{
// Initialize default service locator.
ServiceLocator.Initiailze();
// Register all your services next.
ServiceLocator.Current.Register(this.GetComponentInChildren<LevelService>());
ServiceLocator.Current.Register(this.GetComponentInChildren<PlayerService>());
}
private void Awake()
{
this.Initiailze();
}
}