/// <summary>
/// 更新索引
/// </summary>
/// <param name="changeset">实体</param>
public void Update(LuceneIndexChangeset changeset)
{
var config = new IndexWriterConfig(Lucene.Net.Util.LuceneVersion.LUCENE_48, _analyzer);
using var writer = new IndexWriter(_directory, config);
foreach (var change in changeset.Entries)
{
switch (change.State)
{
case LuceneIndexState.Added:
writer.AddDocument(change.Entity.ToDocument());
break;
case LuceneIndexState.Removed:
writer.DeleteDocuments(new Term("IndexId", change.Entity.IndexId));
break;
case LuceneIndexState.Updated:
writer.UpdateDocument(new Term("IndexId", change.Entity.IndexId), change.Entity.ToDocument());
break;
}
}
writer.Flush(true, changeset.HasDeletes);
}
/// <summary>
/// 删除索引
/// </summary>
/// <param name="entries">实体集</param>
public void Delete <T>(List <T> entries) where T : ILuceneIndexable
{
var set = new LuceneIndexChangeset
{
Entries = entries.Select(e => new LuceneIndexChange(e, LuceneIndexState.Removed)).ToList()
};
Update(set);
}
/// <summary>
/// 检查数据库上下文更改，并返回LuceneIndexChanges类型的集合
/// </summary>
/// <returns> LuceneIndexChangeset - 转换为LuceneIndexChanges类型的实体更改集合</returns>
private LuceneIndexChangeset GetChangeset()
{
var changes = new LuceneIndexChangeset();
foreach (var entity in Context.ChangeTracker.Entries().Where(x => x.State != EntityState.Unchanged))
{
var entityType = entity.Entity.GetType();
if (!typeof(ILuceneIndexable).IsAssignableFrom(entityType) || entityType.GetMethod("ToDocument") is null)
{
continue;
}
var change = new LuceneIndexChange(entity.Entity as ILuceneIndexable);
switch (entity.State)
{
case EntityState.Added:
change.State = LuceneIndexState.Added;
break;
case EntityState.Deleted:
change.State = LuceneIndexState.Removed;
break;
case EntityState.Modified:
change.State = LuceneIndexState.Updated;
break;
default:
change.State = LuceneIndexState.Unchanged;
break;
}
changes.Entries.Add(change);
}
return(changes);
}
/// <summary>
/// 更新索引
/// </summary>
/// <param name="change">实体</param>
public void Update(LuceneIndexChange change)
{
var changeset = new LuceneIndexChangeset(change);
Update(changeset);
}
