[saiku] olap数据源管理

 

一、应用场景

系统初始化的时候
如果没有创建olap数据源需要先创建olap数据源
否则直接获取所有的数据源存放在全局变量datasources里面以便于后续步骤中获取plap-connections

 

二、代码详细解析

1、olap数据源对象结构

(1) SaikuDatasource - org.saiku.datasources.datasource.SaikuDatasource

public SaikuDatasource( String name, Type type, Properties properties ) {
    this.name = name;//数据源名称
    this.type = type;//数据源类型
    this.properties = properties;//数据源属性
}
public enum Type {
    OLAP
}

(2) DataSource - org.saiku.datasources.datasource.SaikuDatasource.DataSource

public DataSource(SaikuDatasource datasource) {
    this.type = datasource.getType().toString();
    this.name = datasource.getName();
    this.driver = datasource.getProperties().getProperty("driver");
    this.location = datasource.getProperties().getProperty("location");
    this.username = datasource.getProperties().getProperty("username");
    this.password = datasource.getProperties().getProperty("password");
    this.id = datasource.getProperties().getProperty("id");
    this.encryptpassword =datasource.getProperties().getProperty("encrypt.password");
    this.securityenabled =datasource.getProperties().getProperty("security.enabled");
    this.securitytype = datasource.getProperties().getProperty("security.type");
    this.securitymapping =datasource.getProperties().getProperty("security.mapping");
    this.advanced = datasource.getProperties().getProperty("advanced");
}

 

2、新增OLAP数据源 

(1)判断是否需要新增此OLAP数据源的代码如下:

    代码结构
    |-Database.loadLegacyDatasources()
        |- LegacyImporterImpl.importDatasources()
详细代码LegacyImporterImpl.importDatasources()

    关键代码:
    
    1) 获取数据源配置文件所在文件夹
    
    String repoURL = "";
    FileSystemManager fileSystemManager = VFS.getManager();
    fileObject fileObject = fileSystemManager.resolveFile("res:saiku-datasources");
    repoURL = fileObject.getURL();
    
    2)遍历该文件夹下所有文件
    File[] files = new File(repoURL.getFile()).listFiles();
    
    3)获取OLAP数据源的配置构造saiku-ds对象并判断是否存在,不存在才添加
    for (File file : files) {
        
        Properties props = new Properties();
        props.load(new FileInputStream(file));
        
        稍微处理下props的location属性之后创建saikuDs
        SaikuDatasource ds = new SaikuDatasource(name, t, props);
        
        //获取已加入JCR的ds
        List<DataSource> dsList = irm.getAllDataSources();
        
        //比对待添加的OLAP_DS和已存在的OLAP_DS的名字,如果不存在,才添加
        boolean isExists = false;
                            
        for (DataSource dataSource : dsList) {
            if(dataSource.getName().equals(ds.getName())){
                isExists = true;
                break;
            }
        }
        
        if(!isExists){
            dsm.addDatasource(ds);                                    
        }
    }

 

(2)新增数据源具体步骤

第一步将ds加入JCR节点
第二步将ds加入全局datasources
  RepositoryDatasourceManager.addDatasource(SaikuDatasource datasource)
  //源代码
  private Map<String, SaikuDatasource> datasources =
            Collections.synchronizedMap(new HashMap<String, SaikuDatasource>());
IRepositoryManager irm
= JackRabbitRepositoryManager.getJackRabbitRepositoryManager(configurationpath, datadir, repopassword,oldpassword); public SaikuDatasource addDatasource(SaikuDatasource datasource){ DataSource ds = new DataSource(datasource); irm.saveDataSource(ds, "/datasources/" + ds.getName() + ".sds", "fixme"); datasources.put(datasource.getName(), datasource); return datasource; }

(3)详解第一步:将ds加入JCR节点

  JackRabbitRepositoryManager.saveDataSource(DataSource ds, String path, String user)
    
    //源代码
    public void saveDataSource(DataSource ds, String path, String user) throws RepositoryException {
    
    //定义字节输出流
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    
    //将DataSource对象转换成XML文件,存入baos中
    try {
      JAXBContext jaxbContext = JAXBContext.newInstance(DataSource.class);
      Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
      jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
      jaxbMarshaller.marshal(ds, baos);
    } catch (JAXBException e) {
      log.error("Could not read XML", e);
    }
    
    //获取文件名
    int pos = path.lastIndexOf("/");
    String filename = "./" + path.substring(pos + 1, path.length());//结果为./schema名
    
    //获取数据源根节点/datadatasources
    Node n = getFolder(path.substring(0, pos));
    
    //在根节点下添加文件节点resNode: path = /datadatasources/filename
    //指定node名字为filename,类型为file,属性为olap_ds,以便后续查询olap数据源能查询到
    Node resNode = n.addNode(filename, "nt:file");
    resNode.addMixin("nt:olapdatasource");

    //在新创建的resNode节点下添加文件内容节点contentNode:
   //path = /datadatasources/filename/jcr:content
//设置该内容节点的内容为转换的XML的内容 Node contentNode = resNode.addNode("jcr:content", "nt:resource"); contentNode.setProperty("jcr:data", baos.toString()); //至此,数据源属性节点和配置内容节点就加入到JCR结构中了 //最后,别忘了保存新增的节点 resNode.getSession().save(); }

 

 

3、获取所有OLAP数据源

(1) 初始化内容仓库管理器

private String configurationXml = projectPath + "saiku-repository/configuration.xml";
private String datadir = projectPath + "saiku-repository/data";    
private String repopassword = "sa!kuanalyt!cs";
private String oldpassword = "";

IRepositoryManager irm = JackRabbitRepositoryManager.getJackRabbitRepositoryManager(configurationpath, datadir, repopassword,oldpassword);\

(2) 初始化JCR基本结构

irm.start(userService);
    
    关键代码:
    
    1)获得内容根节点
    
    //根据configurationXml文件配置在datadir路径下创建JCR文件夹基本结构
    //相当于创建MyRepo
    RepositoryConfig config = RepositoryConfig.create(configurationXml, datadir);
    
    //根据JCR文件夹基本结构生成repository对象
    repository = RepositoryImpl.create(config);
    
    //获取操作JCR的权限[也叫Ticket]
    session = repository.login(
              new SimpleCredentials("admin", password.toCharArray()));
    
    //根据session获取JCR的根节点
    JackrabbitSession js = (JackrabbitSession) session;
    session = js;
    root = session.getRootNode();
    root.getSession().save();
    
    2)为workspace注册Node的类型。四种类型:File/Folder/Schema/DataSource
    createFiles();
    createFolders();
    createSchemas();
    createDataSources();
    
    //创建的大致步骤
    NodeTypeManager manager = session.getWorkspace().getNodeTypeManager();//相同的代码
    NodeTypeTemplate ntt = manager.createNodeTypeTemplate();//相同的代码
    ntt.setName("nt:saikufiles");//依次nt:saikufiles/nt:saikufolders/nt:mondrianschema/nt:olapdatasource
    String[] str = new String[]{"nt:file"};//依次nt:saikufiles/nt:folder/nt:file/nt:file
    ntt.setDeclaredSuperTypeNames(str);
    ntt.setMixin(true);
    
    //创建pdt对象  name有几个值就创建几个
    //File           创建五个:name分别为owner/type/roles/users/jcr:data
    //Folder         创建四个:name分别为owner/type/roles/users
    //Schema         创建四个:name分别为owner/schemaname/cubenames/jcr:data
    ///DataSource    创建三个:name分别为owner/enabled/jcr:data
    PropertyDefinitionTemplate pdt = manager.createPropertyDefinitionTemplate();//相同的代码
    pdt.setName("owner");
    pdt.setRequiredType(PropertyType.STRING);//相同的代码
    
    ntt.getPropertyDefinitionTemplates().add(创建pdt对象);//有几个pdt就添加几次
    
    manager.registerNodeType(ntt, false);//注册新建的节点类型//相同的代码
    
    
    3)为workspace注册命名空间
    createNamespace();
    
    NamespaceRegistry ns = session.getWorkspace().getNamespaceRegistry();
    if (!Arrays.asList(ns.getPrefixes()).contains("home")) {
      ns.registerNamespace("home", "http://www.meteorite.bi/namespaces/home");
    }
    
    4)构建repository结构
    
    在root节点下新增如下文件夹节点结构,并赋予一定的ACL权限<略>
    
  结构:
/homes /datasources /etc /etc/legacyreports /etc/theme /etc/theme/legacyreports Node n = JcrUtils.getOrAddFolder(root, "homes"); n.addMixin("nt:saikufolders"); n = JcrUtils.getOrAddFolder(root, "datasources"); n.addMixin("nt:saikufolders"); n = JcrUtils.getOrAddFolder(root, "etc"); n.addMixin("nt:saikufolders"); n = JcrUtils.getOrAddFolder(n, "legacyreports"); n.addMixin("nt:saikufolders"); n = JcrUtils.getOrAddFolder(root, "etc/theme"); n.addMixin("nt:saikufolders"); n = JcrUtils.getOrAddFolder(n, "legacyreports"); n.addMixin("nt:saikufolders"); session.save();

(3) 获取JCR结构中存在的数据源

List<DataSource> dslist = irm.getAllDataSources();
    
    关键代码:
    
    1)获取MDX查询管理器
    QueryManager qm = session.getWorkspace().getQueryManager();
    
    2)查询执行属性的数据,获得所有类型为Cube数据源的节点
    
    //创建Cube数据源时dsNode.addMixin("nt:olapdatasource");
    String sql = "SELECT * FROM [nt:olapdatasource]";
    Query query = qm.createQuery(sql, Query.JCR_SQL2);
    QueryResult res = query.execute();
    NodeIterator node = res.getNodes();
    
    3)遍历NodeIterator,解析获取每一个node的属性构造Datasource对象
    Node n = node.nextNode();//结果为:node_path = /datadatasources/filename
    
    4)获取cube数据源的schema配置
    String schemaContent = n.getNodes("jcr:content").nextNode().getProperty("jcr:data").getString();
    
    5)将XML文件内容数据流转换为DataSource对象
    Unmarshaller jaxbMarshaller = jaxbContext != null ? jaxbContext.createUnmarshaller() : null;
    JAXBContext jaxbContext = JAXBContext.newInstance(DataSource.class);
    InputStream stream = new ByteArrayInputStream(schemaContent.getBytes());
    DataSource d = (DataSource) (jaxbMarshaller != null ? jaxbMarshaller.unmarshal(stream) : null);
    
    6)设置数据源的路径
    d.setPath(n.getPath());
    
    7)遍历完所有olapds_node以后,返回dsList

(4) 根据dsList拼凑saikuDsList

    for (DataSource file : dslist) {
        Properties props = new Properties();
        根据file构建props
        SaikuDatasource.Type t = SaikuDatasource.Type.valueOf(file.getType().toUpperCase());//OLAP
        SaikuDatasource ds = new SaikuDatasource(file.getName(),t,props);
        datasources.put(file.getName(), ds);//将saikuDs加入到全局变量datasources中
    }

 

posted @ 2015-10-21 16:47  Aviva_ye  阅读(2025)  评论(0编辑  收藏  举报