content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.arrow.driver.jdbc;
  
  import java.sql.Connection;
  import java.sql.SQLException;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Properties;
  import java.util.Set;
  import javax.sql.ConnectionEvent;
  import javax.sql.ConnectionEventListener;
  import javax.sql.PooledConnection;
  import javax.sql.StatementEventListener;
  import org.apache.arrow.driver.jdbc.utils.ConnectionWrapper;
  
  /** {@link PooledConnection} implementation for Arrow Flight JDBC Driver. */
  public class ArrowFlightJdbcPooledConnection implements PooledConnection {
  
    private final ArrowFlightConnection connection;
    private final Set<ConnectionEventListener> eventListeners;
    private final Set<StatementEventListener> statementEventListeners;
  
    private final class ConnectionHandle extends ConnectionWrapper {
      private boolean closed = false;
  
      public ConnectionHandle() {
        super(connection);
      }
  
      @Override
      public void close() throws SQLException {
        if (!closed) {
          closed = true;
          onConnectionClosed();
        }
      }
  
      @Override
      public boolean isClosed() throws SQLException {
        return this.closed || super.isClosed();
      }
    }
  
    ArrowFlightJdbcPooledConnection(ArrowFlightConnection connection) {
      this.connection = connection;
      this.eventListeners = Collections.synchronizedSet(new HashSet<>());
      this.statementEventListeners = Collections.synchronizedSet(new HashSet<>());
    }
  
    public Properties getProperties() {
      return connection.getClientInfo();
    }
  
    @Override
    public Connection getConnection() throws SQLException {
      return new ConnectionHandle();
    }
  
    @Override
    public void close() throws SQLException {
      this.connection.close();
    }
  
    void reset() throws SQLException {
      this.connection.reset();
    }
  
    @Override
    public void addConnectionEventListener(ConnectionEventListener listener) {
      eventListeners.add(listener);
    }
  
    @Override
    public void removeConnectionEventListener(ConnectionEventListener listener) {
      this.eventListeners.remove(listener);
    }
  
    @Override
    public void addStatementEventListener(StatementEventListener listener) {
      statementEventListeners.add(listener);
    }
  
    @Override
    public void removeStatementEventListener(StatementEventListener listener) {
      this.statementEventListeners.remove(listener);
    }
  
    private void onConnectionClosed() {
      ConnectionEvent connectionEvent = new ConnectionEvent(this);
      eventListeners.forEach(listener -> listener.connectionClosed(connectionEvent));
    }
  }
  