122 lines
4.6 KiB
C#
122 lines
4.6 KiB
C#
using Microsoft.EntityFrameworkCore;
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using Persistence.Database.Entity;
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using Persistence.Models;
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using Persistence.Repositories;
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namespace Persistence.Repository.Repositories;
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/// <summary>
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/// Репозиторий для хранения разных наборов данных временных рядов.
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/// idDiscriminator - идентифицирует конкретный набор данных, прим.: циклы измерения АСИБР, или отчет о DrillTest.
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/// idDiscriminator формируют клиенты и только им известно что они обозначают.
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/// Так как данные приходят редко, то их прореживания для построения графиков не предусмотрено.
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/// </summary>
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public class TimestampedSetRepository : ITimestampedSetRepository
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{
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private readonly DbContext db;
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public TimestampedSetRepository(DbContext db)
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{
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this.db = db;
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}
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public Task<int> InsertRange(Guid idDiscriminator, IEnumerable<TimestampedSetDto> sets, CancellationToken token)
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{
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var entities = sets.Select(set => new TimestampedSet(idDiscriminator, set.Timestamp.ToUniversalTime(), set.Set));
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var dbSet = db.Set<TimestampedSet>();
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dbSet.AddRange(entities);
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return db.SaveChangesAsync(token);
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}
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public async Task<IEnumerable<TimestampedSetDto>> Get(Guid idDiscriminator, DateTimeOffset? geTimestamp, IEnumerable<string>? columnNames, int skip, int take, CancellationToken token)
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{
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var dbSet = db.Set<TimestampedSet>();
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var query = dbSet.Where(entity => entity.IdDiscriminator == idDiscriminator);
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if (geTimestamp.HasValue)
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query = ApplyGeTimestamp(query, geTimestamp.Value);
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query = query
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.OrderBy(item => item.Timestamp)
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.Skip(skip)
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.Take(take);
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var data = await Materialize(query, token);
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if (columnNames is not null && columnNames.Any())
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data = ReduceSetColumnsByNames(data, columnNames);
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return data;
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}
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public async Task<IEnumerable<TimestampedSetDto>> GetLast(Guid idDiscriminator, IEnumerable<string>? columnNames, int take, CancellationToken token)
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{
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var dbSet = db.Set<TimestampedSet>();
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var query = dbSet.Where(entity => entity.IdDiscriminator == idDiscriminator);
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query = query.OrderByDescending(entity => entity.Timestamp)
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.Take(take)
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.OrderBy(entity => entity.Timestamp);
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var data = await Materialize(query, token);
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if (columnNames is not null && columnNames.Any())
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data = ReduceSetColumnsByNames(data, columnNames);
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return data;
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}
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public Task<int> Count(Guid idDiscriminator, CancellationToken token)
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{
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var dbSet = db.Set<TimestampedSet>();
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var query = dbSet.Where(entity => entity.IdDiscriminator == idDiscriminator);
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return query.CountAsync(token);
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}
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public async Task<DatesRangeDto?> GetDatesRange(Guid idDiscriminator, CancellationToken token)
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{
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var query = db.Set<TimestampedSet>()
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.GroupBy(entity => entity.IdDiscriminator)
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.Select(group => new
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{
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Min = group.Min(entity => entity.Timestamp),
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Max = group.Max(entity => entity.Timestamp),
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});
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var item = await query.FirstOrDefaultAsync(token);
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if (item is null)
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return null;
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return new DatesRangeDto
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{
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From = item.Min,
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To = item.Max,
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};
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}
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private static async Task<IEnumerable<TimestampedSetDto>> Materialize(IQueryable<TimestampedSet> query, CancellationToken token)
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{
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var dtoQuery = query.Select(entity => new TimestampedSetDto(entity.Timestamp, entity.Set));
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var dtos = await dtoQuery.ToArrayAsync(token);
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return dtos;
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}
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private static IQueryable<TimestampedSet> ApplyGeTimestamp(IQueryable<TimestampedSet> query, DateTimeOffset geTimestamp)
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{
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var geTimestampUtc = geTimestamp.ToUniversalTime();
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return query.Where(entity => entity.Timestamp >= geTimestampUtc);
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}
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private static IEnumerable<TimestampedSetDto> ReduceSetColumnsByNames(IEnumerable<TimestampedSetDto> query, IEnumerable<string> columnNames)
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{
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var newQuery = query
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.Select(entity => new TimestampedSetDto(
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entity.Timestamp,
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entity.Set
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.Where(prop => columnNames.Contains(prop.Key))
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.ToDictionary(prop => prop.Key, prop => prop.Value)
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));
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return newQuery;
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}
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}
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