// The MIT License (MIT)

//

// Copyright (c) 2015-2016 Rasmus Mikkelsen

// Copyright (c) 2015-2016 eBay Software Foundation

// https://github.com/rasmus/EventFlow

//

// Permission is hereby granted, free of charge, to any person obtaining a copy of

// this software and associated documentation files (the "Software"), to deal in

// the Software without restriction, including without limitation the rights to

// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of

// the Software, and to permit persons to whom the Software is furnished to do so,

// subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS

// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR

// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER

// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

//

using System;

using System.Threading;

using System.Threading.Tasks;

using EventFlow.ReadStores;

namespace EventFlow.Queries

{

public class ReadModelByIdQuery<TReadModel> : IQuery<TReadModel>

where TReadModel : class, IReadModel, new()

{

public string Id { get; }

public ReadModelByIdQuery(string id)

{

if (string.IsNullOrEmpty(id)) throw new ArgumentNullException(nameof(id));

Id = id;

}

}

public class ReadModelByIdQueryHandler<TReadStore, TReadModel> : IQueryHandler<ReadModelByIdQuery<TReadModel>, TReadModel>

where TReadStore : IReadModelStore<TReadModel>

where TReadModel : class, IReadModel, new()

{

private readonly TReadStore _readStore;

public ReadModelByIdQueryHandler(

TReadStore readStore)

{

_readStore = readStore;

}

public async Task<TReadModel> ExecuteQueryAsync(ReadModelByIdQuery<TReadModel> query, CancellationToken cancellationToken)

{

var readModelEnvelope = await _readStore.GetAsync(query.Id, cancellationToken).ConfigureAwait(false);

return readModelEnvelope.ReadModel;

}

}

}