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public sealed class SearchIndexManager { private static readonly SearchIndexManager searchIndexManager = new SearchIndexManager(); private SearchIndexManager() { } public static SearchIndexManager GetInstance() { return searchIndexManager; } Queue<IndexContent> queue = new Queue<IndexContent>(); /// <summary> /// 向队列中添加数据 /// </summary> /// <param name="Id"></param> /// <param name="title"></param> /// <param name="content"></param> public void AddQueue(string Id,string title,string content) { IndexContent indexContent = new IndexContent(); indexContent.Id = Id; indexContent.Title = title; indexContent.Content = content; indexContent.LuceneEnum = Model.Enum.LuceneEnum.AddType;// 添加 queue.Enqueue(indexContent); } /// <summary> /// 向队列中添加要删除数据 /// </summary> /// <param name="Id"></param> public void DeleteQueue(string Id) { IndexContent indexContent = new IndexContent(); indexContent.Id = Id; indexContent.LuceneEnum = Model.Enum.LuceneEnum.DeleType;//删除 queue.Enqueue(indexContent); } /// <summary> /// 开启线程,扫描队列,从队列中获取数据 /// </summary> public void StartThread() { Thread myThread = new Thread(WriteIndexContent); myThread.IsBackground = true; myThread.Start(); } private void WriteIndexContent() { while (true) { if (queue.Count > 0) { CreateIndexContent(); } else { Thread.Sleep(5000);//避免造成CPU空转 } } } private void CreateIndexContent() { string indexPath = @"C:lucenedir";//注意和磁盘上文件夹的大小写一致,否则会报错。将创建的分词内容放在该目录下。一定将路径名称写到web.config文件中 FSDirectory directory = FSDirectory.Open(new DirectoryInfo(indexPath), new NativeFSLockFactory());//指定索引文件(打开索引目录) FS指的是就是FileSystem bool isUpdate = IndexReader.IndexExists(directory);//IndexReader:对索引进行读取的类。该语句的作用:判断索引库文件夹是否存在以及索引特征文件是否存在。 if (isUpdate) { //同时只能有一段代码对索引库进行写操作。当使用IndexWriter打开directory时会自动对索引库文件上锁。 //如果索引目录被锁定(比如索引过程中程序异常退出),则首先解锁(提示一下:如果我现在正在写着已经加锁了,但是还没有写完,这时候又来一个请求,那么不就解锁了吗?这个问题后面会解决) if (IndexWriter.IsLocked(directory)) { IndexWriter.Unlock(directory); } } IndexWriter writer = new IndexWriter(directory, new PanGuAnalyzer(), !isUpdate, Lucene.Net.Index.IndexWriter.MaxFieldLength.UNLIMITED);//向索引库中写索引。这时在这里加锁。 while(queue.Count>0) { IndexContent indexContent=queue.Dequeue();//将队列中的数据出队 writer.DeleteDocuments(new Term("Id", indexContent.Id.ToString())); if (indexContent.LuceneEnum == Model.Enum.LuceneEnum.DeleType) { continue; } Document document = new Document();//表示一篇文档。 //Field.Store.YES:表示是否存储原值。只有当Field.Store.YES在后面才能用doc.Get("number")取出值来.Field.Index. NOT_ANALYZED:不进行分词保存 document.Add(new Field("Id", indexContent.Id.ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED)); //Field.Index. ANALYZED:进行分词保存:也就是要进行全文的字段要设置分词 保存(因为要进行模糊查询) //Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS:不仅保存分词还保存分词的距离。 document.Add(new Field("Title", indexContent.Title, Field.Store.YES, Field.Index.ANALYZED, Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS)); document.Add(new Field("Content", indexContent.Content, Field.Store.YES, Field.Index.ANALYZED, Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS)); writer.AddDocument(document); } writer.Close();//会自动解锁。 directory.Close();//不要忘了Close,否则索引结果搜不到 } }
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public enum LuceneEnum { /// <summary> /// 添加 /// </summary> AddType, /// <summary> /// 删除 /// </summary> DeleType }
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public class IndexContent { public string Id { get; set; } public string Title { get; set; } public string Content { get; set; } public LuceneEnum LuceneEnum { get; set; } }
private static readonly SearchIndexManager searchIndexManager = new SearchIndexManager();要采用单例模式
private SearchIndexManager()
{
}
public static SearchIndexManager GetInstance()
{
return searchIndexManager;
}
在添加、删除需要检索的表单时调用队列的增加、删除
在Global调用
protected void Application_Start()
{
SearchIndexManager.GetInstance().StartThread();//开启线程扫描队列将数据取出来写到Lucene.NET中。