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Support for testing Hibernate ORM Jakarta functionality

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.testing.jdbc.leak;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.PostgreSQL91Dialect;

/**
 * @author Vlad Mihalcea
 */
public class PostgreSQLIdleConnectionCounter implements IdleConnectionCounter {

	public static final IdleConnectionCounter INSTANCE = new PostgreSQLIdleConnectionCounter();

	@Override
	public boolean appliesTo(Class dialect) {
		return PostgreSQL91Dialect.class.isAssignableFrom( dialect );
	}

	@Override
	public int count(Connection connection) {
		try ( Statement statement = connection.createStatement() ) {
			try ( ResultSet resultSet = statement.executeQuery(
					"select count(*) " +
							"from pg_stat_activity " +
							"where state ilike '%idle%'" ) ) {
				while ( resultSet.next() ) {
					return resultSet.getInt( 1 );
				}
				return 0;
			}
		}
		catch ( SQLException e ) {
			throw new IllegalStateException( e );
		}
	}
}