74 lines
2.5 KiB
C#
74 lines
2.5 KiB
C#
using GrossesMitainesAPI.Data;
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using GrossesMitainesAPI.Models;
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using Microsoft.EntityFrameworkCore;
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namespace GrossesMitainesAPI.Services {
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public class DatabaseCacheService {
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private readonly IServiceScopeFactory _contextFactory; // https://entityframeworkcore.com/knowledge-base/51939451/how-to-use-a-database-context-in-a-singleton-service-
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private readonly ILogger<DatabaseCacheService> _logger;
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private Product[] _cache = new Product[1];
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private bool _ok = false, _needUpd = true;
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private PeriodicTimer _timer = new PeriodicTimer(TimeSpan.FromSeconds(10));
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public DatabaseCacheService(ILogger<DatabaseCacheService> logger, IServiceScopeFactory scopeFactory) {
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_contextFactory = scopeFactory;
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_logger = logger;
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_ok = UpdateCache();
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_needUpd = !_ok;
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UpdateJob();
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}
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private async void UpdateJob() {
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while (await _timer.WaitForNextTickAsync())
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if (_needUpd) {
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_ok = UpdateCache();
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_needUpd = !_ok;
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}
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}
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private bool UpdateCache() {
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try {
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Product[] prods;
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using (var scope = _contextFactory.CreateScope()) {
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var db = scope.ServiceProvider.GetRequiredService<InventoryContext>();
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prods = db.Products.ToArray();
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}
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lock (_cache) {
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_cache = prods;
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}
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} catch (Exception e) {
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_logger.LogError(e, "Erreur de mise à jour de cache.");
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return false;
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}
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return true;
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}
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public bool isOk() { return _ok; }
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public void askForRefresh() { _needUpd = true; }
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public Product[]? GetCacheCopy() {
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if (!_ok) return null;
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Product[] copy;
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try {
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lock (_cache) {
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copy = new Product[_cache.Length];
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_cache.CopyTo(copy, 0);
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}
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} catch (Exception e) {
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_logger.LogError(e, "Erreur de copie de cache.");
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return null;
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}
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return copy;
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}
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public IQueryable<Product> queryCache() {
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if (!_ok) return null;
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try {
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return _cache.AsQueryable();
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} catch (Exception e) {
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_logger.LogError(e, "Erreur de cache.");
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return null;
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}
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}
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}
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}
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