import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
import java.util.Vector;

public class PersonDefine_ConnectionPool implements Runnable {
	
	public  String ProductionDB = "axdb_tmp";//給的默認值
	private String database_driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";//給的默認值
	// private String
	// dakabase_url="jdbc:sybase:Tds:IP:port/dakabase_test?useUnicode=true&characterEncoding=UTF-8";
	private String database_url = "jdbc:sqlserver://localhost:1433;DatabaseName=mgr_live"; //給的默認值
	private String username = "sa";
	private String password = "12345678";
	private int maxConnections = 50;
	private boolean waitIfBusy = true;
	private Vector availableConnections, busyConnections;
	private boolean connectionPending = false;

	public PersonDefine_ConnectionPool(Properties props) throws SQLException {

		System.out.println("jdbc:PersonDefine_ConnectionPool...");
		int initialConnections = 0;
		this.ProductionDB = props.getProperty("ELITEDATA.ProductionDB");
		this.database_driver = props.getProperty("ELITEDATA.database_driver").trim();
		this.database_url = props.getProperty("ELITEDATA.database_url");
		this.username=props.getProperty("ELITEDATA.database_username");
		this.password=props.getProperty("ELITEDATA.database_password");
		this.maxConnections = maxConnections;
		this.waitIfBusy = waitIfBusy;
		if (initialConnections > maxConnections) {
			initialConnections = maxConnections;
		}
		availableConnections = new Vector(initialConnections);
		busyConnections = new Vector();
		for (int i = 0; i < initialConnections; i++) {
			availableConnections.addElement(makeNewConnection());
		}
	}

	public synchronized Connection getConnection() throws SQLException {
		System.out.println("jdbc:Get PersonDefine_ConnectionPool...");
		if (!availableConnections.isEmpty()) {
			Connection existingConnection = (Connection) availableConnections.lastElement();
			int lastIndex = availableConnections.size() - 1;
			availableConnections.removeElementAt(lastIndex);
			// If connection on available list is closed (e.g.,
			// it timed out), then remove it from available list
			// and repeat the process of obtaining a connection.
			// Also wake up threads that were waiting for a
			// connection because maxConnection limit was reached.
			if (existingConnection.isClosed()) {
				notifyAll(); // Freed up a spot for anybody waiting
				return (getConnection());
			} else {
				busyConnections.addElement(existingConnection);
				return (existingConnection);
			}
		} else {
			// Three possible cases:
			// 1) You haven't reached maxConnections limit. So
			// establish one in the background if there isn't
			// already one pending, then wait for
			// the next available connection (whether or not
			// it was the newly established one).
			// 2) You reached maxConnections limit and waitIfBusy
			// flag is false. Throw SQLException in such a case.
			// 3) You reached maxConnections limit and waitIfBusy
			// flag is true. Then do the same thing as in second
			// part of step 1: wait for next available connection.

			if ((totalConnections() < maxConnections) && !connectionPending) {
				makeBackgroundConnection();
			} else if (!waitIfBusy) {
				throw new SQLException("PersonDefine_ConnectionPool limit reached");
			}
			// Wait for either a new connection to be established
			// (if you called makeBackgroundConnection) or for
			// an existing connection to be freed up.
			try {
				wait();
			} catch (InterruptedException ie) {
			}
			// Someone freed up a connection, so try again.
			return (getConnection());
		}
	}

	// You can't just make a new connection in the foreground
	// when none are available, since this can take several
	// seconds with a slow network connection. Instead,
	// start a thread that establishes a new connection,
	// then wait. You get woken up either when the new c