public void ProcessPriceUpdates(string productCode)
{
// get the necessary dependencies
IWebPageEngine pageEngine = EngineLocator.CreateEngine <IWebPageEngine>();
IProductParserEngine priceEngine = EngineLocator.CreateEngine <IProductParserEngine>();
IProductAccessor productAccessor = AccessorLocator.CreateAccessor <IProductAccessor>();
IEmailAccessor emailAccessor = AccessorLocator.CreateAccessor <IEmailAccessor>();
// build the url
string url = pageEngine.BuildUrl(productCode);
// get the page contents
string contents = pageEngine.GetWebPageContents(url);
// get the stored product information
var product = productAccessor.FindByCode(productCode);
// get the current price
decimal currentPrice = priceEngine.GetProductPrice(contents, productCode);
// if the current price is different from the price threshold then send an email
if (currentPrice > 0)
{
if (product.PriceThreshold != currentPrice)
{
emailAccessor.SendPriceNotice(product, currentPrice);
}
}
}
/// <summary>
/// Constructor used for dependency injection
/// </summary>
public PriceManager(IWebPageEngine pageEngine,
IProductParserEngine priceEngine,
IProductAccessor productAccessor,
IEmailAccessor emailAccessor)
{
Console.WriteLine("PriceManager constructor called");
_emailAccessor = emailAccessor;
_pageEngine = pageEngine;
_priceEngine = priceEngine;
_productAccessor = productAccessor;
}
