public override async Task ExecuteAsync(TaskExecutionContext ctx)
{
var count = 0;
var numDeleted = 0;
var numAdded = 0;
var numCategories = 0;
var pageSize = 500;
var pageIndex = -1;
var categoryIds = ctx.Parameters.ContainsKey("CategoryIds")
? ctx.Parameters["CategoryIds"].ToIntArray()
: null;
// Hooks are enabled because search index needs to be updated.
using (var scope = new DbContextScope(ctx: _productCategoryRepository.Context, autoDetectChanges: false, validateOnSave: false, hooksEnabled: true, autoCommit: false))
{
// Delete existing system mappings.
var deleteQuery = _productCategoryRepository.Table.Where(x => x.IsSystemMapping);
if (categoryIds != null)
{
deleteQuery = deleteQuery.Where(x => categoryIds.Contains(x.CategoryId));
}
var pager = new FastPager <ProductCategory>(deleteQuery, pageSize);
while (pager.ReadNextPage(out var mappings))
{
if (ctx.CancellationToken.IsCancellationRequested)
{
return;
}
if (mappings.Any())
{
_productCategoryRepository.DeleteRange(mappings);
numDeleted += await scope.CommitAsync();
}
}
try
{
_productCategoryRepository.Context.DetachEntities <ProductCategory>();
}
catch { }
// Insert new product category mappings.
var categoryQuery = _categoryRepository.TableUntracked.Expand(x => x.RuleSets);
if (categoryIds != null)
{
categoryQuery = categoryQuery.Where(x => categoryIds.Contains(x.Id));
}
var categories = await categoryQuery
.Where(x => x.Published && !x.Deleted && x.RuleSets.Any(y => y.IsActive))
.ToListAsync();
numCategories = categories.Count;
foreach (var category in categories)
{
var ruleSetProductIds = new HashSet <int>();
ctx.SetProgress(++count, categories.Count, $"Add product mappings for category \"{category.Name.NaIfEmpty()}\".");
// Execute active rule sets and collect product ids.
foreach (var ruleSet in category.RuleSets.Where(x => x.IsActive))
{
if (ctx.CancellationToken.IsCancellationRequested)
{
return;
}
if (_ruleFactory.CreateExpressionGroup(ruleSet, _productRuleProvider) is SearchFilterExpression expression)
{
pageIndex = -1;
while (true)
{
// Do not touch searchResult.Hits. We only need the product identifiers.
var searchResult = _productRuleProvider.Search(new SearchFilterExpression[] { expression }, ++pageIndex, pageSize);
ruleSetProductIds.AddRange(searchResult.HitsEntityIds);
if (pageIndex >= (searchResult.TotalHitsCount / pageSize))
{
break;
}
}
}
}
// Add mappings.
if (ruleSetProductIds.Any())
{
foreach (var chunk in ruleSetProductIds.Slice(500))
{
if (ctx.CancellationToken.IsCancellationRequested)
{
return;
}
foreach (var productId in chunk)
{
_productCategoryRepository.Insert(new ProductCategory
{
ProductId = productId,
CategoryId = category.Id,
IsSystemMapping = true
});
++numAdded;
}
await scope.CommitAsync();
}
try
{
_productCategoryRepository.Context.DetachEntities <ProductCategory>();
}
catch { }
}
}
}
Debug.WriteLineIf(numDeleted > 0 || numAdded > 0, $"Deleted {numDeleted} and added {numAdded} product mappings for {numCategories} categories.");
}