/*

   Derby - Class org.apache.derby.client.ClientXAConnection

   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.derby.client;

import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.XAConnection;
import javax.transaction.xa.XAResource;

import org.apache.derby.client.am.ClientMessageId;
import org.apache.derby.client.am.LogWriter;
import org.apache.derby.client.am.SqlException;
import org.apache.derby.client.net.NetXAConnection;
import org.apache.derby.client.net.NetXAResource;
import org.apache.derby.shared.common.reference.SQLState;

public class ClientXAConnection extends ClientPooledConnection implements XAConnection {
    private static int rmIdSeed_ = 95688932; // semi-random starting value for rmId

    private XAResource xares_ = null;
    private NetXAResource netXares_ = null;
    private boolean fFirstGetConnection_ = true;

     // logicalConnection_ is inherited from ClientPooledConnection
    private Connection logicalCon_;

    // This connection is used to access the indoubt table
    private NetXAConnection controlCon_ = null;

    public ClientXAConnection(BasicClientDataSource ds,
                              LogWriter logWtr,
                              String userId,
                              String password) throws SQLException {
        super(ds, logWtr, userId, password, getUnigueRmId());

        // Have to instantiate a real connection here,
        // otherwise if XA function is called before the connect happens,
        // an error will be returned
        // Note: conApp will be set after this call
        logicalCon_ = super.getConnection();

        netXares_ = new NetXAResource(this, netXAPhysicalConnection_);
        xares_ = netXares_;
    }

    public Connection getConnection() throws SQLException {
        if (fFirstGetConnection_) {
            // Since super.getConnection() has already been called once
            // in the constructor, we don't need to call it again for the
            // call of this method.
            fFirstGetConnection_ = false;
        } else {
            // A new connection object is required
            logicalCon_ = super.getConnection();
        }
        return logicalCon_;
    }

    private static synchronized int getUnigueRmId() {
        rmIdSeed_ += 1;
        return rmIdSeed_;
    }

    public int getRmId() {
        return rmId_;
    }

    public XAResource getXAResource() throws SQLException {
        if (logWriter_ != null) {
            logWriter_.traceExit(this, "getXAResource", xares_);
        }
        // DERBY-2532
        if (super.physicalConnection_ == null) {
            throw new SqlException(logWriter_,
                    new ClientMessageId(SQLState.NO_CURRENT_CONNECTION)
                ).getSQLException();
        }
        return xares_;
    }

    public synchronized void close() throws SQLException {
        super.close();
    }
}

