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refactored ioc/service locator to hopefully improve clarity/readability

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This commit is contained in:
Matthew D. Groves 2011-03-06 13:46:04 -05:00
parent e56a165011
commit 592d74f9d8
3 changed files with 24 additions and 10 deletions
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30
MonoStockPortfolio/Framework/IoCAttribute.cs
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@ -1,3 +1,4 @@
using System;
using Android.Content;
using PostSharp.Aspects;
@ -7,17 +8,16 @@ namespace MonoStockPortfolio.Framework
{
public sealed override void OnGetValue(LocationInterceptionArgs args)
{
args.ProceedGetValue();
if (args.Value == null)
args.ProceedGetValue();
if (args.Value == null) // lazy loading
{
if (ServiceLocator.Context == null)
{
var activityContext = (Context) args.Instance;
ServiceLocator.Context = activityContext.ApplicationContext.ApplicationContext;
}
var context = args.Instance as Context;
if(context == null) throw new Exception("The IoC Aspect can only be used on a field within an Activity (or Context) object");
var locationType = args.Location.LocationType;
var instantiation = ServiceLocator.Get(locationType);
ResolveContextDependency((Context)args.Instance);
var dependencyType = args.Location.LocationType;
var instantiation = ServiceLocator.Get(dependencyType);
if (instantiation != null)
{
@ -26,5 +26,17 @@ namespace MonoStockPortfolio.Framework
args.ProceedGetValue();
}
}
private static void ResolveContextDependency(Context contextObject)
{
if (ServiceLocator.Context == null)
{
// note the double ApplicationContext
// is because the context's reference could get garbage collected while the app is still goin
// for whatever reason, but it's reference's reference is long-running
// and since this context dependency is mainly used for Sqlite, that's the most ideal one
ServiceLocator.Context = contextObject.ApplicationContext.ApplicationContext;
}
}
}
}

3
MonoStockPortfolio/Framework/ServiceLocator.cs
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@ -14,7 +14,10 @@ namespace MonoStockPortfolio.Framework
static ServiceLocator()
{
// presenters
IttyBittyIoC.Register<IMainPresenter>(() => new MainPresenter(new AndroidSqlitePortfolioRepository(Context)));
// services/repositories
IttyBittyIoC.Register<IStockDataProvider>(() => new YahooStockDataProvider());
IttyBittyIoC.Register<IPortfolioService>(() => new PortfolioService(new AndroidSqlitePortfolioRepository(Context), new YahooStockDataProvider()));
IttyBittyIoC.Register<IPortfolioRepository>(() => new AndroidSqlitePortfolioRepository(Context));

1
MonoStockPortfolio/Presenters/MainPresenter.cs
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@ -1,5 +1,4 @@
using System.Collections.Generic;
using Android.Util;
using MonoStockPortfolio.Core.PortfolioRepositories;
using MonoStockPortfolio.Entities;
using System.Linq;