Forked from JakeGinnivan/AsyncAutomapper.linq.cs
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void Main() | |
{ | |
var configurationStore = new ConfigurationStore(new TypeMapFactory(), MapperRegistry.Mappers); | |
var mapper = new MappingEngine(configurationStore); | |
var server = new Server(); | |
configurationStore | |
.CreateMap<From, To>() | |
.ForMember(d => d.ServerThing, m => m.MapFrom(s => s.ServerThingId)) | |
.ForMember(d => d.AnotherServerThing, m => m.MapFrom(s => s.AnotherServerThingId)); | |
configurationStore | |
.CreateMap<string, FromServer>() | |
.ConvertUsing(new FromServer1Converter(server)); | |
configurationStore | |
.CreateMap<string, FromServer2>() | |
.ConvertUsing(new FromServer2Converter(server)); | |
var fromValue = new From { ServerThingId = "Id1", AnotherServerThingId = "Id2" }.Dump(); | |
mapper.AsyncMap<To>(fromValue).Result.Dump(); | |
} | |
public static class AsyncExtensions | |
{ | |
public static Task<TTo> AsyncMap<TTo>(this IMappingEngine mapper, object source) | |
{ | |
var asyncMapContext = new AsyncContext(); | |
// TODO the exception should be inside the task | |
var result = mapper.Map<TTo>(source, o => o.Items.Add("AsyncContext", asyncMapContext)); | |
return asyncMapContext.MappingTask.ContinueWith(t => result); | |
} | |
} | |
public class Server | |
{ | |
public Task<FromServer> GetThing(string id) | |
{ | |
return Task.Run(() => new FromServer { Id = id, OtherData = Guid.NewGuid().ToString() }); | |
} | |
public Task<FromServer2> GetAnotherThing(string id) | |
{ | |
return Task.Run(() => new FromServer2 { Id = id, OtherData = Guid.NewGuid().ToString() }); | |
} | |
} | |
public class FromServer1Converter : AsyncValueConverter<string, FromServer> | |
{ | |
Server server; | |
public FromServer1Resolver(Server server) | |
{ | |
this.server = server; | |
} | |
protected override Task<FromServer> GetValue(string fromValue) | |
{ | |
return server.GetThing(fromValue); | |
} | |
} | |
public class FromServer2Converter : AsyncTypeConverter<string, FromServer2> | |
{ | |
Server server; | |
public FromServer2Resolver(Server server) | |
{ | |
this.server = server; | |
} | |
protected override Task<FromServer2> GetValue(string fromValue) | |
{ | |
return server.GetAnotherThing(fromValue); | |
} | |
} | |
public abstract class AsyncTypeConverter<TFrom, TTo> : ITypeConverter<TTo, TFrom> | |
{ | |
public TDestination Convert(ResolutionContext context); | |
{ | |
var contextItems = context.Options.Items; | |
if (!contextItems.ContainsKey("AsyncContext")) | |
throw new InvalidOperationException("You must use mapper.AsyncMap when using async value resolvers"); | |
var asyncContext = (AsyncContext)contextItems["AsyncContext"]; | |
asyncContext.StartAsyncOperation(); | |
var sourceValue = context.SourceValue; | |
TDestination result; | |
GetValue((TFrom)sourceValue) | |
.ContinueWith(r => | |
{ | |
result = r.Result; | |
asyncContext.OperationFinished(); | |
}); | |
return result; | |
} | |
protected abstract Task<TTo> GetValue(TFrom fromValue); | |
} | |
public class AsyncContext | |
{ | |
object locker = new object(); | |
TaskCompletionSource<object> taskSource = new TaskCompletionSource<object>(); | |
int activeCalls = 0; | |
public void StartAsyncOperation() | |
{ | |
lock (locker) { activeCalls++; }; | |
} | |
public void OperationFinished() | |
{ | |
var isComplete = false; | |
lock (locker) | |
{ | |
activeCalls--; | |
if (activeCalls == 0) | |
{ | |
isComplete = true; | |
} | |
}; | |
if (isComplete) | |
taskSource.SetResult(null); | |
} | |
public Task MappingTask | |
{ | |
get { return taskSource.Task; } | |
} | |
} | |
public class To | |
{ | |
public FromServer ServerThing { get; set; } | |
public FromServer2 AnotherServerThing { get; set; } | |
} | |
public class From | |
{ | |
public string ServerThingId {get;set;} | |
public string AnotherServerThingId {get;set;} | |
} | |
public class FromServer | |
{ | |
public string Id { get; set; } | |
public string OtherData { get; set; } | |
} | |
public class FromServer2 | |
{ | |
public string Id { get; set; } | |
public string OtherData { get; set; } | |
} |
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