/// <summary>
/// 2.0 删除索引项
/// </summary>
/// <param name="id"></param>
public void Delete(int id)
{
IndexTask task = new IndexTask();
task.Id = id;
task.Type = TaskType.Delete;
queue.Enqueue(task);
}
//操作队列的一些列方法：
/// <summary>
/// 1.0 新增索引项.每新增一篇博客就调用一次Add()方法
/// </summary>
/// <param name="id">博客id</param>
/// <param name="title">标题</param>
/// <param name="msg">内容</param>
public void Add(int id, string title, string content)
{
IndexTask task = new IndexTask()
{
Id = id,
Title = title,
Content = content,
Type = TaskType.Add
};
//将该任务插入队列
queue.Enqueue(task);
}
/// <summary>
/// Lucene 倒排索引处理
/// 开始→数据→文本→分词器→Field对象→Document对象→IndexWriter→Directory→结束
/// </summary>
private void IndexHandler()
{
//将创建的分词内容放在该目录下.
string indexPath = System.Configuration.ConfigurationManager.AppSettings["IndexPath"];
FSDirectory directory = FSDirectory.Open(new DirectoryInfo(indexPath), new NativeFSLockFactory());
bool isUpdate = IndexReader.IndexExists(directory);
if (isUpdate)
{
if (IndexWriter.IsLocked(directory))
{
IndexWriter.Unlock(directory);
}
}
IndexWriter writer = new IndexWriter(directory, new PanGuAnalyzer(), !isUpdate, IndexWriter.MaxFieldLength.UNLIMITED);
//循环遍历队列
while (queue.Count > 0)
{
IndexTask task = queue.Dequeue();
writer.DeleteDocuments(new Term("id", task.Id.ToString()));
if (task.Type == TaskType.Delete)
{
continue;
}
Document document = new Document();
document.Add(new Field("id", task.Id.ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));
document.Add(new Field("title", task.Title, Field.Store.YES, Field.Index.ANALYZED, Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS));
document.Add(new Field("content", task.Content, Field.Store.YES, Field.Index.ANALYZED, Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS));
writer.AddDocument(document);
}
writer.Close();
directory.Close();
}