solr创建索引源码解析

先说下创建索引源码流程：

      源码类： 
          1.CommonHttpSolrServer (SolrServer的子类) 
          2.SolrServer（抽象类） 
          3.SolrRequest (基类) 
          4.AbstractUpdateRequest (抽象类、SolrRequest的子类) 
          5.UpdateRequest  (AbstractUpdateRequest的子类) 
          6.SolrInputDocument  （设置需要索引的名称和值、这个应该放在第一位） 

创建索引代码：

1.        查询数据库数据，或者其他文档数据进行索引
   

             private void updateBook(String sql, String url, String idColumn,
               String timeColumn,BufferedWriter dataFile) throws Exception {
           long start = System.currentTimeMillis();
                   <span></span> SolrUtil solrUtil = new SolrUtil(url);//初始化索引
           SolrDocument doc = SqlSh.getSolrMaxDoc(solrUtil, idColumn, timeColumn);
           if (doc == null) {
               CommonLogger.getLogger().error("solr no data.");
               return;
           }
           int maxId = Integer.parseInt(doc.get(idColumn).toString());
           long maxTime = Long.parseLong(doc.get(timeColumn).toString())*1000;
           Date maxDate = new Date(maxTime);
   
           DateFormat dateFormat2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                   //获取数据库需要索引的数据
           ResultSet rs = stmt_m.executeQuery(String.format(sql,
                   dateFormat2.format(maxDate)));
           //获取需要创建索引的key
                   initColumeMeta(rs.getMetaData());
   
                   //解析数据并索引
           parseRs(rs, solrUtil);
   
           rs.close();
   
                   //优化索引
           solrUtil.server.optimize();
   
           CommonLogger.getLogger().info(
                   "update book time:" + (System.currentTimeMillis() - start)
                           / 1000 + "s");
       }

   
   
   
2. 咱们看下上面代码的parseRs方法
   

   //下面是简单的解析数据方法并写索引

   
   

    private void parseRs(ResultSet rs, SolrUtil solrUtil) throws <span></span> Exception {
           Collection<SolrInputDocument> docs=new ArrayList<SolrInputDocument>();
           SolrInputDocument doc = null;
           int locBk = 0;
           boolean flag=true;
           StringBuilder sb=null;
           String vl=null;
           try {
               while (rs.next()) {
                   doc = new SolrInputDocument();
                   for (int i = 0; i < ToolMain.columnNames.length; i++) {
                       doc.addField(
                           ToolMain.columnNames[i],
                           getColumnValue(
                               rs.getObject(ToolMain.columnNames[i]),
                               ToolMain.columnTypes[i]));//此方法为设置一个域，可以添加一个参数来设置权重
                   }
                   docs.add(doc);
                   locBk++;
                   if (docs.size() >= 1000) {
                       solrUtil.addDocList(docs);//创建索引和提交索引操作都在这里面
                       docs.clear();
                   }
               }
               if (docs.size() > 0) {
                   solrUtil.addDocList(docs);
                   docs.clear();
               }
           } catch (Exception e) {
               throw e;
           } finally {
               docs.clear();
               docs = null;
           }
       }

   
   3.下面来说明下SolrUtil类，此类主要是封装了CommonHttpSolrServer
   

   import java.util.Collection;
   
   import log.CommonLogger;
   
   import org.apache.solr.client.solrj.impl.CommonsHttpSolrServer;
   import org.apache.solr.common.SolrInputDocument;
   
   public class SolrUtil {
       public CommonsHttpSolrServer server = null;
   
       public String url = "";//url为solr服务的地址
       public  String shards = "";
   
       public SolrUtil(String url) {
           this.url = url;
           initSolr();
       }
       public SolrUtil(String url,String shards) {
           this.url = url;
           this.shards=shards;
           initSolr();
       }
          //初始化Server
       private void initSolr() {
           try {
               server = new CommonsHttpSolrServer(url);
               server.setSoTimeout(60*1000);
               server.setConnectionTimeout(60*1000);
               server.setDefaultMaxConnectionsPerHost(1000);
               server.setMaxTotalConnections(1000);
               server.setFollowRedirects(false);
               server.setAllowCompression(true);
           } catch (Exception e) {
               e.printStackTrace();
               System.exit(-1);
           }
       }
       //封装了add、commit
       public void addDocList(Collection<SolrInputDocument> docs) {
           try {
               server.add(docs);
               server.commit();
               docs.clear();//释放
           } catch (Exception e) {
               CommonLogger.getLogger().error("addDocList error.", e);
           }
       }
   
       public void deleteDocByQuery(String query) throws Exception {
           try {
               server.deleteByQuery(query);
               server.commit();
           } catch (Exception e) {
               CommonLogger.getLogger().error("deleteDocByQuery error.", e);
               throw e;
           }
       }
   }

   
   

   4.现在来看看solr创建索引的源码

       其实源码执行的操作无非是 生成请求request  返回response

       1.上面代码中的SolrInputDocument 类所做的操作

       public class SolrInputDocument implements Map<String,SolrInputField>, Iterable<SolrInputField>, Serializable   //实现了Map和Iterable的接口并且实现了接口中的方法，其主要的类为SolrInputFiled类

   
   

       public class SolrInputField implements Iterable<Object>, Serializable //类中只有三个属性，String key，Object value，还包括评分  float boost = 1.0f; 默认是1.0f（如果做权重的话可以设置这个值）

   
   

   再来看下执行的CommonHttpSolrServer类所做的操作（表现形式在SolrUtil中的addDocList）

       2.添加文档方法

   public UpdateResponse add(Collection<SolrInputDocument> docs )                         throws SolrServerException, IOException {

   
   

               UpdateRequest req = new UpdateRequest();//创建一个request

   
   

             req.add(docs);//调用UpdateRequest的add方法，添加索引文档
             return req.process(this);//亲 重点是这个方法（返回的是response）
      }

   
   

           //再看下UpdateRequest的add方法
           private List<SolrInputDocument> documents = null;
           public UpdateRequest add( final Collection<SolrInputDocument> docs )
           {
               if( documents == null ) {
                     documents = new ArrayList<SolrInputDocument>( docs.size()+1 );
               }
               documents.addAll( docs );
               return this;
           }

   
    3.提交方法 commit，调用的是SolrServer类中的
   

    public UpdateResponse commit( boolean waitFlush, boolean waitSearcher ) throws Solr    ServerException, IOException {
           return new UpdateRequest().setAction( UpdateRequest.ACTION.COMMIT, waitFlush, waitSearcher ).process( this );//看到了吗？
   <pre class="java; toolbar: true; auto-links: false;"> setAction都是为了对对象ModifiableSolrParams（这个对象在最终CommonHttpSolrServerrequest的request方法中用的到）</pre>
   <span></span> 在提交索引的时候也是调用的process方法
     }

   
   4.优化索引
   

   public UpdateResponse optimize(boolean waitFlush, boolean waitSearcher,                 int maxSegments ) throws SolrServerException, IOException {
   sp;           return new UpdateRequest().setAction( UpdateRequest.ACTION.OPTIMIZE, waitFlush, waitSearcher, maxSegments ).process( this );//同样调用process，通过setAction参数，在CommonHttpSolrServer类方法request（）中主要执行的是合并和压缩  setAction都是为了对对象ModifiableSolrParams（这个对象在最终CommonHttpSolrServer的request方法中用的到）进行赋值
   }

   
   5.既然上面都提到了process方法，那我们来看看
   

   @Override
        public UpdateResponse process( SolrServer server ) throws SolrServerException,             IOException
        {
              long startTime = System.currentTimeMillis();
              UpdateResponse res = new UpdateResponse();
              res.setResponse( server.request( this ) );//这里面这个方法可是重点之重啊，这是调用了 CommonHttpSolrServer类中的request方法
              res.setElapsedTime( System.currentTimeMillis()-startTime );
              return res;
        }

   
   6.最终的方法是SolrServer的子类CommonHttpSolrServer类的request方法，咋再来看看这个方法是怎么工作的
   

   public NamedList<Object> request(final SolrRequest request, ResponseParser processor    ) throws SolrServerException, IOException {
   
       HttpMethod method = null;
       InputStream is = null;
       SolrParams params = request.getParams();
       Collection<ContentStream> streams = requestWriter.getContentStreams(request);
       String path = requestWriter.getPath(request);
   
       //创建索引进来的是/update  /select 为查询
       if( path == null || !path.startsWith( "/" ) ) {
         path = "/select";
       }
   
       ResponseParser parser = request.getResponseParser();
       if( parser == null ) {
         parser = _parser;
       }
   
       // The parser 'wt=' and 'version=' params are used instead of the original params
       ModifiableSolrParams wparams = new ModifiableSolrParams();
       wparams.set( CommonParams.WT, parser.getWriterType() );
       wparams.set( CommonParams.VERSION, parser.getVersion());
       if( params == null ) {
         params = wparams;
       }
       else {
         params = new DefaultSolrParams( wparams, params );
       }
   
       if( _invariantParams != null ) {
         params = new DefaultSolrParams( _invariantParams, params );
       }
   
       int tries = _maxRetries + 1;
       try {
         while( tries-- > 0 ) {
           // Note: since we aren't do intermittent time keeping
           // ourselves, the potential non-timeout latency could be as
           // much as tries-times (plus scheduling effects) the given
           // timeAllowed.
           try {//通过使用查看solr源码，在使用UpdateRequest对象时会自动设置为Post
             if( SolrRequest.METHOD.GET == request.getMethod() ) {
               if( streams != null ) {
                     <span></span>throw new SolrException( SolrException.ErrorCode.BAD_REQUEST, "GET can't send streams!" );
               }
               method = new GetMethod( _baseURL + path + ClientUtils.toQueryString( params, false ) );
             }
             else if( SolrRequest.METHOD.POST == request.getMethod() ) {//所以我们直接看
   
               String url = _baseURL + path;
               boolean isMultipart = ( streams != null && streams.size() > 1 );
   
               if (streams == null || isMultipart) {
                 PostMethod post = new PostMethod(url);//设置post，包括request头部、内容、参数、等等一些操作
                 post.getParams().setContentCharset("UTF-8");
                 if (!this.useMultiPartPost && !isMultipart) {
                   post.addRequestHeader("Content-Type",
                       "application/x-www-form-urlencoded; charset=UTF-8");
                 }
   
                 List<Part> parts = new LinkedList<Part>();
                 Iterator<String> iter = params.getParameterNamesIterator();
                 while (iter.hasNext()) {
                   String p = iter.next();
                   String[] vals = params.getParams(p);
                   if (vals != null) {
                     for (String v : vals) {
                       if (this.useMultiPartPost || isMultipart) {
                         parts.add(new StringPart(p, v, "UTF-8"));
                       } else {
                         post.addParameter(p, v);
                       }
                     }
                   }
                 }
   
                 if (isMultipart) {
                   int i = 0;
                   for (ContentStream content : streams) {
                     final ContentStream c = content;
   
                     String charSet = null;
                     PartSource source = new PartSource() {
                       public long getLength() {
                         return c.getSize();
                       }
                       public String getFileName() {
                         return c.getName();
                       }
                       public InputStream createInputStream() throws IOException {
                         return c.getStream();
                       }
                     };
   
                     parts.add(new FilePart(c.getName(), source,
                                            c.getContentType(), charSet));
                   }
                 }
                 if (parts.size() > 0) {
                   post.setRequestEntity(new MultipartRequestEntity(parts
                       .toArray(new Part[parts.size()]), post.getParams()));
                 }
   
                 method = post;
               }
               // It is has one stream, it is the post body, put the params in the URL
               else {
                 String pstr = ClientUtils.toQueryString(params, false);
                 PostMethod post = new PostMethod(url + pstr);
   
                 // Single stream as body
                 // Using a loop just to get the first one
                 final ContentStream[] contentStream = new ContentStream[1];
                 for (ContentStream content : streams) {
                   contentStream[0] = content;
                   break;
                 }
                 if (contentStream[0] instanceof RequestWriter.LazyContentStream) {
                   post.setRequestEntity(new RequestEntity() {
                     public long getContentLength() {
                       return -1;
                     }
   
                     public String getContentType() {
                       return contentStream[0].getContentType();
                     }
   
                     public boolean isRepeatable() {
                       return false;
                     }
   
                     public void writeRequest(OutputStream outputStream) throws IOException {
                       ((RequestWriter.LazyContentStream) contentStream[0]).writeTo(outputStream);
                     }
                   }
                   );
   
                 } else {
                   is = contentStream[0].getStream();
                   post.setRequestEntity(new InputStreamRequestEntity(is, contentStream[0].getContentType()));
                 }
                 method = post;
               }
             }
             else {
               throw new SolrServerException("Unsupported method: "+request.getMethod() );
             }
           }
           catch( NoHttpResponseException r ) {
             // This is generally safe to retry on
             method.releaseConnection();
             method = null;
             if(is != null) {
               is.close();
             }
             // If out of tries then just rethrow (as normal error).
             if( ( tries < 1 ) ) {
               throw r;
             }
             //log.warn( "Caught: " + r + ". Retrying..." );
           }
         }
       }
       catch( IOException ex ) {
         throw new SolrServerException("error reading streams", ex );
       }
   
       method.setFollowRedirects( _followRedirects );
       method.addRequestHeader( "User-Agent", AGENT );
       if( _allowCompression ) {
         method.setRequestHeader( new Header( "Accept-Encoding", "gzip,deflate" ) );
       }
   
       try {
         // Execute the method.
         //System.out.println( "EXECUTE:"+method.getURI() );
         //执行请求，返回状态码，然后组装response 最后返回
         int statusCode = _httpClient.executeMethod(method);
         if (statusCode != HttpStatus.SC_OK) {
           StringBuilder msg = new StringBuilder();
           msg.append( method.getStatusLine().getReasonPhrase() );
           msg.append( "
   
   " );
           msg.append( method.getStatusText() );
           msg.append( "
   
   " );
           msg.append( "request: "+method.getURI() );
           throw new SolrException(statusCode, java.net.URLDecoder.decode(msg.toString(), "UTF-8") );
         }
   
         // Read the contents
         String charset = "UTF-8";
         if( method instanceof HttpMethodBase ) {
           charset = ((HttpMethodBase)method).getResponseCharSet();
         }
         InputStream respBody = method.getResponseBodyAsStream();
         // Jakarta Commons HTTPClient doesn't handle any
         // compression natively.  Handle gzip or deflate
         // here if applicable.
         if( _allowCompression ) {
           Header contentEncodingHeader = method.getResponseHeader( "Content-Encoding" );
           if( contentEncodingHeader != null ) {
             String contentEncoding = contentEncodingHeader.getValue();
             if( contentEncoding.contains( "gzip" ) ) {
               //log.debug( "wrapping response in GZIPInputStream" );
               respBody = new GZIPInputStream( respBody );
             }
             else if( contentEncoding.contains( "deflate" ) ) {
               //log.debug( "wrapping response in InflaterInputStream" );
               respBody = new InflaterInputStream(respBody);
             }
           }
           else {
             Header contentTypeHeader = method.getResponseHeader( "Content-Type" );
             if( contentTypeHeader != null ) {
               String contentType = contentTypeHeader.getValue();
               if( contentType != null ) {
                 if( contentType.startsWith( "application/x-gzip-compressed" ) ) {
                   //log.debug( "wrapping response in GZIPInputStream" );
                   respBody = new GZIPInputStream( respBody );
                 }
                 else if ( contentType.startsWith("application/x-deflate") ) {
                   //log.debug( "wrapping response in InflaterInputStream" );
                   respBody = new InflaterInputStream(respBody);
                 }
               }
             }
           }
         }
         return processor.processResponse(respBody, charset);
       }
       catch (HttpException e) {
         throw new SolrServerException( e );
       }
       catch (IOException e) {
         throw new SolrServerException( e );
       }
       finally {
         method.releaseConnection();
         if(is != null) {
           is.close();
         }
       }
     }