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Teiid Code Analysis - Mind Map

• TeiidDriver create a Connection
• TeiidDriver create a Connection in embedded
• Statement execute Query
• Teiid Embedded Server Initialization
• Teiid Embedded Server startup
• Teiid Embedded Server deployVDB

TeiidDriver create a Connection

Teiid provide a JDBC Driver used by client to connect to Teiid Virtual Database (VDB) it use the below formated URL to create connection,

DriverManager.getConnection("jdbc:teiid:Marketdata@mm://localhost:31000;version=1", "user", "user")

The Mind map for creating a Connection:

Base on above figure, we the seperate DriverManager getConnection into three steps:

• create SocketServerConnectionFactory, init OioObjectChannelFactory
• create ServerConnection, init a SocketServerInstanceImpl which carry a OioObjectChannel, the OioObjectChannel contain a socket which connect to the Teiid Server
• create ConnectionImpl base on ServerConnection

We can use the following code to simulate the whole connection creatation process:

/*
 * 1. create SocketServerConnectionFactory, init OioObjectChannelFactory
 */
SocketServerConnectionFactory factory = SocketServerConnectionFactory.getInstance();
		
/*
 * 2. create ServerConnection
 */
Properties prop = new Properties();
prop.setProperty("ApplicationName", "JDBC");
prop.setProperty("version", "1");
prop.setProperty("serverURL", "mm://localhost:31000");
prop.setProperty("user", "user");
prop.setProperty("password", "user");
prop.setProperty("VirtualDatabaseVersion", "1");
prop.setProperty("VirtualDatabaseName", "Marketdata");
		
ServerConnection serverConn = factory.getConnection(prop);
		
/*
 * 3. create ConnectionImpl
 */
String url = "jdbc:teiid:Marketdata@mm://localhost:31000;version=1";
prop.put("clientIpAddress", "127.0.0.1");
prop.put("clientHostName", "localhost");
		
ConnectionImpl conn = new ConnectionImpl(serverConn, prop, url);

TeiidDriver create a Connection in embedded

Teiid Embedded is a light-weight version of Teiid, it contain an easy-to-use JDBC Driver, in Embedded mode the URL used create a connection like

Connection conn = driver.connect("jdbc:teiid:Marketdata", null);

The Mind Map for creating a connection in embedded:

Statement execute Query

Once the Connection be created, we can use the Connection execute JDBC query like

Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM Customer");

The Mind Map of Statement execute Query:

Teiid Embedded Server Initialization

Teiid Embedded Server can be thought of an easy-to-use JDBC Driver with an embed Query Engine which can be used in any Java Application. Embedded Server Initialization like

EmbeddedServer server = new EmbeddedServer();

The Mind Map for Embedded Server Initialization:

• EmbeddedProfile implements org.teiid.jdbc.ConnectionProfile
• DQPCore implements org.teiid.client.DQP
• VDBRepository represents repository for VDBs
• SessionServiceImpl implements org.teiid.dqp.service.SessionService
• BufferServiceImpl implements org.teiid.dqp.service.BufferService
• TransactionServerImpl implements org.teiid.dqp.service.TransactionService
• ClientServiceRegistryImpl implements org.teiid.transport.ClientServiceRegistry

Teiid Embedded Server startup

Teiid Embedded Server startup with an EmbeddedConfiguration like

server.start(new EmbeddedConfiguration());

The Mind Map for Embedded Server start

Combine with previous EmbeddedServer Initialization, total 16 threads created so far:

• TimeTask in new SessionServiceImpl() and getBufferService() relevant 2 daemon threads up
• Infinispan Cachemanager start 3 local cache resultset, resultset-repl, preparedplan cause 3 transaction clean up threads and 1 eviction thread up
• Netty’s new NioServerSocketChannelFactory() start up 8 New I/O worker threads and 1 accept thread New I/O server boss

Teiid Embedded Server deployVDB

Teiid Embedded Server deploy vdb:

server.deployVDB("vdb.xml");

The Mind Map for Embedded Server deploy VDB

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