よしです。
コネクションを取得する部分のソースを追ってみた内容を書きます。
DBFluteConfig.java
ここで「DataSourceUtils」を使って「Connection 」を取っています。
public static class SpringTransactionalDataSourceHandler implements DataSourceHandler {
public Connection getConnection(DataSource ds) throws SQLException {
final Connection conn = getConnectionFromUtils(ds);
if (isConnectionTransactional(conn, ds)) {
return new NotClosingConnectionWrapper(conn);
} else {
return conn;
}
}
public Connection getConnectionFromUtils(DataSource ds) {
return DataSourceUtils.getConnection(ds);
}
public boolean isConnectionTransactional(Connection conn, DataSource ds) {
return DataSourceUtils.isConnectionTransactional(conn, ds);
}
}
DataSourceUtils.java
ここで「ConnectionHolder」から 「Connection 」を取り出しているって感じです。
ここからは想像ですが、トランザクション開始時に「Connection 」を保存してそれを使いまわしているのかなと思っています。
public static Connection getConnection(DataSource dataSource) throws CannotGetJdbcConnectionException {
try {
return doGetConnection(dataSource);
}
catch (SQLException ex) {
throw new CannotGetJdbcConnectionException("Failed to obtain JDBC Connection", ex);
}
catch (IllegalStateException ex) {
throw new CannotGetJdbcConnectionException("Failed to obtain JDBC Connection", ex);
}
}
public static Connection doGetConnection(DataSource dataSource) throws SQLException {
Assert.notNull(dataSource, "No DataSource specified");
ConnectionHolder conHolder = (ConnectionHolder) TransactionSynchronizationManager.getResource(dataSource);
if (conHolder != null && (conHolder.hasConnection() || conHolder.isSynchronizedWithTransaction())) {
conHolder.requested();
if (!conHolder.hasConnection()) {
logger.debug("Fetching resumed JDBC Connection from DataSource");
conHolder.setConnection(fetchConnection(dataSource));
}
return conHolder.getConnection();
}
// Else we either got no holder or an empty thread-bound holder here.
logger.debug("Fetching JDBC Connection from DataSource");
Connection con = fetchConnection(dataSource);
if (TransactionSynchronizationManager.isSynchronizationActive()) {
try {
// Use same Connection for further JDBC actions within the transaction.
// Thread-bound object will get removed by synchronization at transaction completion.
ConnectionHolder holderToUse = conHolder;
if (holderToUse == null) {
holderToUse = new ConnectionHolder(con);
}
else {
holderToUse.setConnection(con);
}
holderToUse.requested();
TransactionSynchronizationManager.registerSynchronization(
new ConnectionSynchronization(holderToUse, dataSource));
holderToUse.setSynchronizedWithTransaction(true);
if (holderToUse != conHolder) {
TransactionSynchronizationManager.bindResource(dataSource, holderToUse);
}
}
catch (RuntimeException ex) {
// Unexpected exception from external delegation call -> close Connection and rethrow.
releaseConnection(con, dataSource);
throw ex;
}
}
return con;
}
2023年4月14日金曜日 14:37:56 UTC+9 jflute: