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ElasticSearchProjection.cs
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ElasticSearchProjection.cs
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using Core.ElasticSearch.Indices;
using Core.Events;
using Core.Projections;
using Elastic.Clients.Elasticsearch;
using Microsoft.Extensions.DependencyInjection;
namespace Core.ElasticSearch.Projections;
public class ElasticSearchProjection<TEvent, TView> : IEventHandler<EventEnvelope<TEvent>>
where TView : class, IProjection
where TEvent : notnull
{
private readonly ElasticsearchClient elasticClient;
private readonly Func<TEvent, string> getId;
public ElasticSearchProjection(
ElasticsearchClient elasticClient,
Func<TEvent, string> getId
)
{
this.elasticClient = elasticClient ?? throw new ArgumentNullException(nameof(elasticClient));
this.getId = getId ?? throw new ArgumentNullException(nameof(getId));
}
public async Task Handle(EventEnvelope<TEvent> eventEnvelope, CancellationToken ct)
{
var id = getId(eventEnvelope.Data);
var indexName = IndexNameMapper.ToIndexName<TView>();
var entity = (await elasticClient.GetAsync<TView>(id, i => i.Index(indexName), ct).ConfigureAwait(false))?.Source ??
(TView) Activator.CreateInstance(typeof(TView), true)!;
entity.Evolve(eventEnvelope);
await elasticClient.IndexAsync(
entity,
i => i.Index(indexName).Id(id).VersionType(VersionType.External).Version((long)eventEnvelope.Metadata.StreamPosition),
ct
).ConfigureAwait(false);
}
}
public static class ElasticSearchProjectionConfig
{
public static IServiceCollection Project<TEvent, TView>(this IServiceCollection services,
Func<TEvent, string> getId)
where TView : class, IProjection
where TEvent : notnull
{
services.AddTransient<IEventHandler<EventEnvelope<TEvent>>>(sp =>
{
var session = sp.GetRequiredService<ElasticsearchClient>();
return new ElasticSearchProjection<TEvent, TView>(session, getId);
});
return services;
}
}