svn-gvsig-desktop / branches / simbologia / libraries / libFMap / src / com / iver / cit / gvsig / fmap / drivers / jdbc / utils / SingleJDBCConnectionManager.java @ 10450
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package com.iver.cit.gvsig.fmap.drivers.jdbc.utils; |
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import java.sql.Connection; |
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import java.sql.DriverManager; |
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import java.sql.SQLException; |
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import java.util.ArrayList; |
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import java.util.HashMap; |
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import java.util.Iterator; |
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import org.apache.log4j.Logger; |
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import com.iver.cit.gvsig.fmap.drivers.DefaultDBDriver; |
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import com.iver.cit.gvsig.fmap.layers.LayerFactory; |
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/**
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* Utility class to handle connections properly. One connection instance per
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* (db, user, gvsig session)
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*
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* @author jldominguez
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*
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*/
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public class SingleJDBCConnectionManager { |
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private static Logger logger = Logger.getLogger(SingleJDBCConnectionManager.class.getName()); |
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private static SingleJDBCConnectionManager single_instance = null; |
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private HashMap connections = new HashMap(); |
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/**
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* Non-public to avoid unwanted instances.
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*
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*/
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protected SingleJDBCConnectionManager() {
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} |
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/**
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* Singleton model to keep single instances.
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*
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* @return single instance
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*/
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public static SingleJDBCConnectionManager instance() { |
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if (single_instance == null) { |
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single_instance = new SingleJDBCConnectionManager();
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} |
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return single_instance;
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} |
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/**
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* Utility metho to find a connection with its parameters
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* given the connection object.
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*
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* @param co the connection object
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* @return
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*/
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public ConnectionWithParams findConnection(Connection co) { |
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Iterator iter = connections.keySet().iterator();
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while (iter.hasNext()) {
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String keyitem = (String) iter.next(); |
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ConnectionWithParams cwp = (ConnectionWithParams) connections.get(keyitem); |
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if (cwp.getConnection() == co) {
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return cwp;
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} |
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} |
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return null; |
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} |
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/**
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* Creates a new connection with its parameters if not created yet.
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*
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* @param _drvName driver name
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* @param _user user name
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* @param _pw password
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* @param _name connection name
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* @param _host host url
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* @param _port port number as string
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* @param _db databade name
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* @param _connected whether or not to connect the connection
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* @return the connection with parameters object
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* @throws SQLException
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*/
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public ConnectionWithParams getConnection (
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String _drvName,
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String _user,
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String _pw,
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String _name,
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String _host,
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String _port,
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String _db,
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boolean _connected
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) throws SQLException { |
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DefaultDBDriver drv = getInstanceFromName(_drvName); |
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String conn_str = drv.getConnectionString(_host, _port, _db, _user, _pw);
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String key = getConnectionKey(_drvName, _host, _port, _user);
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if (!connections.containsKey(key)) {
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ConnectionWithParams cwp = null;
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if (_connected) {
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Connection new_connection = null; |
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new_connection = DriverManager.getConnection(conn_str, _user, _pw);
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new_connection.setAutoCommit(false);
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cwp = new ConnectionWithParams(
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conn_str, |
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new_connection, |
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_drvName, |
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_user, |
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_pw, |
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_name, |
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_host, |
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_port, |
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_db, |
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true);
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} else {
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cwp = new ConnectionWithParams(
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conn_str, |
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null,
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_drvName, |
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_user, |
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null,
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_name, |
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_host, |
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_port, |
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_db, |
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false);
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} |
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connections.put(key, cwp); |
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} |
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ConnectionWithParams _cwp = (ConnectionWithParams) connections.get(key); |
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if (_cwp.getName().compareTo(_name) != 0) { |
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// connections.remove(key);
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_cwp.setName(_name); |
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connections.put(key, _cwp); |
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} |
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if ((!_cwp.isConnected()) && (_connected)) {
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_cwp.connect(_pw); |
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} |
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return _cwp;
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} |
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/**
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* Gets available open connections.
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*
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* @return array of open connections with parameters
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*/
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public ConnectionWithParams[] getConnectedConnections() { |
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Iterator iter = connections.keySet().iterator();
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if (!iter.hasNext()) return null; |
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ArrayList aux = new ArrayList(); |
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while (iter.hasNext()) {
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ConnectionWithParams _cwp = |
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(ConnectionWithParams) connections.get(iter.next()); |
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if (_cwp.isConnected()) {
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aux.add(_cwp); |
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} |
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} |
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ConnectionWithParams[] resp = new ConnectionWithParams[aux.size()]; |
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for (int i=0; i<aux.size(); i++) { |
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resp[i] = (ConnectionWithParams) aux.get(i); |
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} |
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return resp;
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} |
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/**
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* Gets all available connections.
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*
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* @return array of all connections with parameters
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*/
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public ConnectionWithParams[] getAllConnections() { |
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Iterator iter = connections.keySet().iterator();
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if (!iter.hasNext()) return null; |
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ArrayList aux = new ArrayList(); |
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while (iter.hasNext()) {
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ConnectionWithParams _cwp = |
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(ConnectionWithParams) connections.get(iter.next()); |
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aux.add(_cwp); |
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} |
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ConnectionWithParams[] resp = new ConnectionWithParams[aux.size()]; |
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for (int i=0; i<aux.size(); i++) { |
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resp[i] = (ConnectionWithParams) aux.get(i); |
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} |
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return resp;
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} |
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/**
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* Removes connection with its params.
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*
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* @param _cwp connection with params to be removed
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*/
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private void removeConnectionWP(ConnectionWithParams _cwp) { |
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ArrayList keysToRemove = new ArrayList(); |
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Iterator iter = connections.keySet().iterator();
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while (iter.hasNext()) {
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Object key = iter.next();
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ConnectionWithParams cwp = (ConnectionWithParams) connections.get(key); |
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if (cwp == _cwp) {
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keysToRemove.add(key); |
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} |
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} |
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for (int i=0; i<keysToRemove.size(); i++) { |
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connections.remove(keysToRemove.get(i)); |
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} |
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} |
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/**
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* Closes and removes a connection with params object
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*
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* @param _cwp
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* @return whether the connection was actually closed (false if the
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* connection was not open at the start)
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*/
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public boolean closeAndRemove(ConnectionWithParams _cwp) { |
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boolean it_was_open = true; |
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try {
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it_was_open = (_cwp.getConnection() != null) && (!_cwp.getConnection().isClosed());
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if (_cwp.getConnection() != null) _cwp.getConnection().close(); |
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removeConnectionWP(_cwp); |
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} catch (Exception se) { |
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logger.error("While closing connection: " + se.getMessage(), se);
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return false; |
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} |
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logger.info("Connection successfully closed.");
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return it_was_open;
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} |
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/**
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* Called by the extension object when gvsig terminates.
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*
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*/
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public void closeAllBeforeTerminate() { |
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boolean ok = true; |
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String key = ""; |
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ConnectionWithParams cwp = null;
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Iterator iter = connections.keySet().iterator();
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while (iter.hasNext()) {
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key = (String) iter.next();
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cwp = (ConnectionWithParams) connections.get(key); |
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if (cwp.getConnection() == null) continue; |
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try {
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cwp.getConnection().close(); |
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} catch (SQLException se) { |
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ok = false;
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logger.error("While closing connection: " + se.getMessage(), se);
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} |
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} |
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connections.clear(); |
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if (ok) {
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logger.info("Successfully closed all connections.");
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} else {
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logger.warn("Problems while closing all connections.");
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} |
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} |
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/**
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* Gets the objects key to be used in the inner hashmap
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* @param _drvName driver name
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* @param _host host's url
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* @param _port port number
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* @param _user user name
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* @return
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*/
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private static String getConnectionKey( |
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String _drvName,
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String _host,
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String _port,
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String _user) {
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String resp = "_driver_" + _drvName.toLowerCase(); |
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resp = resp + "_host_" + _host.toLowerCase();
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resp = resp + "_port_" + _port;
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resp = resp + "_user_" + _user.toLowerCase();
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return resp;
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} |
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/**
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* Utility method to instantiate a driver given its name.
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*
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* @param drvname driver name
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* @return driver instance
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*/
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public static DefaultDBDriver getInstanceFromName(String drvname) { |
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DefaultDBDriver _driver = null;
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try {
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_driver = (DefaultDBDriver) LayerFactory.getDM().getDriver(drvname); |
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} catch (Exception e) { |
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logger.error("While getting driver instance: " + e.getMessage(), e);
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} |
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return _driver;
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} |
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} |