content: /*
   * Copyright (c) 2002, 2020, Oracle and/or its affiliates.
   *
   * This program is free software; you can redistribute it and/or modify it under
   * the terms of the GNU General Public License, version 2.0, as published by the
   * Free Software Foundation.
   *
   * This program is also distributed with certain software (including but not
   * limited to OpenSSL) that is licensed under separate terms, as designated in a
   * particular file or component or in included license documentation. The
   * authors of MySQL hereby grant you an additional permission to link the
   * program and your derivative works with the separately licensed software that
   * they have included with MySQL.
   *
   * Without limiting anything contained in the foregoing, this file, which is
   * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
   * version 1.0, a copy of which can be found at
   * http://oss.oracle.com/licenses/universal-foss-exception.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   * FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
   * for more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
   */
  
  package com.mysql.cj.jdbc;
  
  import java.sql.SQLException;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.sql.XAConnection;
  import javax.transaction.xa.XAException;
  import javax.transaction.xa.XAResource;
  import javax.transaction.xa.Xid;
  
  import com.mysql.cj.conf.PropertyKey;
  
  public class SuspendableXAConnection extends MysqlPooledConnection implements XAConnection, XAResource {
  
      protected static SuspendableXAConnection getInstance(JdbcConnection mysqlConnection) throws SQLException {
          return new SuspendableXAConnection(mysqlConnection);
      }
  
      public SuspendableXAConnection(JdbcConnection connection) {
          super(connection);
          this.underlyingConnection = connection;
      }
  
      private static final Map<Xid, XAConnection> XIDS_TO_PHYSICAL_CONNECTIONS = new HashMap<>();
  
      private Xid currentXid;
  
      private XAConnection currentXAConnection;
      private XAResource currentXAResource;
  
      private JdbcConnection underlyingConnection;
  
      private static synchronized XAConnection findConnectionForXid(JdbcConnection connectionToWrap, Xid xid) throws SQLException {
          // TODO: check for same GTRID, but different BQUALs...MySQL doesn't allow this yet
  
          // Note, we don't need to check for XIDs here, because MySQL itself will complain with a XAER_NOTA if need be.
  
          XAConnection conn = XIDS_TO_PHYSICAL_CONNECTIONS.get(xid);
  
          if (conn == null) {
              conn = new MysqlXAConnection(connectionToWrap, connectionToWrap.getPropertySet().getBooleanProperty(PropertyKey.logXaCommands).getValue());
              XIDS_TO_PHYSICAL_CONNECTIONS.put(xid, conn);
          }
  
          return conn;
      }
  
      private static synchronized void removeXAConnectionMapping(Xid xid) {
          XIDS_TO_PHYSICAL_CONNECTIONS.remove(xid);
      }
  
      private synchronized void switchToXid(Xid xid) throws XAException {
          if (xid == null) {
              throw new XAException();
          }
  
          try {
              if (!xid.equals(this.currentXid)) {
                  XAConnection toSwitchTo = findConnectionForXid(this.underlyingConnection, xid);
                  this.currentXAConnection = toSwitchTo;
                  this.currentXid = xid;
                  this.currentXAResource = toSwitchTo.getXAResource();
              }
          } catch (SQLException sqlEx) {
              throw new XAException();
          }
      }
  
      @Override
      public XAResource getXAResource() throws SQLException {
          return this;
      }
  
      @Override
      public void commit(Xid xid, boolean arg1) throws XAException {
          switchToXid(xid);
          this.currentXAResource.commit(xid, arg1);
          removeXAConnectionMapping(xid);
      }
  
      @Override
      public void end(Xid xid, int arg1) throws XAException {
          switchToXid(xid);
          this.currentXAResource.end(xid, arg1);
      }
  
      @Override
      public void forget(Xid xid) throws XAException {
          switchToXid(xid);
          this.currentXAResource.forget(xid);
          // remove?
          removeXAConnectionMapping(xid);
      }
  
      @Override
      public int getTransactionTimeout() throws XAException {
          return 0;
      }
  
      @Override
      public boolean isSameRM(XAResource xaRes) throws XAException {
          return xaRes == this;
      }
  
      @Override
      public int prepare(Xid xid) throws XAException {
          switchToXid(xid);
          return this.currentXAResource.prepare(xid);
      }
  
      @Override
      public Xid[] recover(int flag) throws XAException {
          return MysqlXAConnection.recover(this.underlyingConnection, flag);
      }
  
      @Override
      public void rollback(Xid xid) throws XAException {
          switchToXid(xid);
          this.currentXAResource.rollback(xid);
          removeXAConnectionMapping(xid);
      }
  
      @Override
      public boolean setTransactionTimeout(int arg0) throws XAException {
          return false;
      }
  
      @Override
      public void start(Xid xid, int arg1) throws XAException {
          switchToXid(xid);
  
          if (arg1 != XAResource.TMJOIN) {
              this.currentXAResource.start(xid, arg1);
  
              return;
          }
  
          //
          // Emulate join, by using resume on the same physical connection
          //
  
          this.currentXAResource.start(xid, XAResource.TMRESUME);
      }
  
      @Override
      public synchronized java.sql.Connection getConnection() throws SQLException {
          if (this.currentXAConnection == null) {
              return getConnection(false, true);
          }
  
          return this.currentXAConnection.getConnection();
      }
  
      @Override
      public void close() throws SQLException {
          if (this.currentXAConnection == null) {
              super.close();
          } else {
              removeXAConnectionMapping(this.currentXid);
              this.currentXAConnection.close();
          }
      }
  }
  