Android Open Source - DKO Cheap Connection Pooling Data Source

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Back to project page DKO.

License

The source code is released under:

GNU Lesser General Public License

Java Source Code

package org.kered.dko.datasource;
/*from   www  .  j  av  a  2 s.  c  om*/
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.EmptyStackException;
import java.util.Stack;
import java.util.logging.Logger;

import javax.sql.DataSource;

public class CheapConnectionPoolingDataSource implements DataSource {
  
  private final DataSource src;
  private Stack<Connection> pool = new Stack<Connection>();

  public CheapConnectionPoolingDataSource(DataSource src) {
    this.src = src;
  }

  @Override
  public PrintWriter getLogWriter() throws SQLException {
    return src.getLogWriter();
  }

  @Override
  public void setLogWriter(PrintWriter out) throws SQLException {
    src.setLogWriter(out);
  }

  @Override
  public void setLoginTimeout(int seconds) throws SQLException {
    src.setLoginTimeout(seconds);
  }

  @Override
  public int getLoginTimeout() throws SQLException {
    return src.getLoginTimeout();
  }

  @Override
  public Logger getParentLogger() throws SQLFeatureNotSupportedException {
    return src.getParentLogger();
  }

  @Override
  public <T> T unwrap(Class<T> iface) throws SQLException {
    return src.unwrap(iface);
  }

  @Override
  public boolean isWrapperFor(Class<?> iface) throws SQLException {
    return src.isWrapperFor(iface);
  }

  @Override
  public Connection getConnection() throws SQLException {
    while (true) {
      try {
        return pool.pop();
      } catch (EmptyStackException e) {
        Connection conn = new UnClosableConnection(src.getConnection(), new UnClosableConnection.CloseListener() {
          @Override
          public void wasClosed(final UnClosableConnection c) {
            pool.push(c);
          }
        });
        pool.push(conn);
      }
    }
  }

  @Override
  public Connection getConnection(String username, String password) throws SQLException {
    // TODO Auto-generated method stub
    return null;
  }

}

Java Source Code List

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