public async Task <ActionResult> UpdateProductAsync([FromBody] CatalogItem productToUpdate)
{
var catalogItem = await _catalogContext.CatalogItems.SingleOrDefaultAsync(i => i.Id == productToUpdate.Id);
if (catalogItem == null)
{
return(NotFound(new { Message = $"Item with id {productToUpdate.Id} not found." }));
}
var oldPrice = catalogItem.Price;
var raiseProductPriceChangedEvent = oldPrice != productToUpdate.Price;
// Update current product
catalogItem = productToUpdate;
_catalogContext.CatalogItems.Update(catalogItem);
if (raiseProductPriceChangedEvent) // Save product's data and publish integration event through the Event Bus if price has changed
{
//Create Integration Event to be published through the Event Bus
var priceChangedEvent = new ProductPriceChangedIntegrationEvent(catalogItem.Id, productToUpdate.Price, oldPrice);
// Achieving atomicity between original Catalog database operation and the IntegrationEventLog thanks to a local transaction
await _catalogIntegrationEventService.SaveEventAndCatalogContextChangesAsync(priceChangedEvent);
// Publish through the Event Bus and mark the saved event as published
await _catalogIntegrationEventService.PublishThroughEventBusAsync(priceChangedEvent);
}
else // Just save the updated product because the Product's Price hasn't changed.
{
await _catalogContext.SaveChangesAsync();
}
var cache = _catalogContext.GetCache();
await Task.Run(() =>
{
cache.Insert(catalogItem, out string cacheKey, new CachingOptions
{
});
});
return(CreatedAtAction(nameof(ItemByIdAsync), new { id = productToUpdate.Id }, null));
}
