SyncCreateDataSource.java

/**
 * 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.activemq.broker.ft;

import javax.sql.DataSource;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.logging.Logger;

import org.apache.derby.jdbc.EmbeddedDataSource;

// prevent concurrent calls from attempting to create the db at the same time
// can result in "already exists in this jvm" errors

public class SyncCreateDataSource implements DataSource {

   final EmbeddedDataSource delegate;

   SyncCreateDataSource(EmbeddedDataSource dataSource) {
      this.delegate = dataSource;
   }

   @Override
   public Connection getConnection() throws SQLException {
      synchronized (this) {
         return delegate.getConnection();
      }
   }

   @Override
   public Connection getConnection(String username, String password) throws SQLException {
      synchronized (this) {
         return delegate.getConnection();
      }
   }

   @Override
   public PrintWriter getLogWriter() throws SQLException {
      return null;
   }

   @Override
   public void setLogWriter(PrintWriter out) throws SQLException {
   }

   @Override
   public int getLoginTimeout() throws SQLException {
      return 0;
   }

   @Override
   public void setLoginTimeout(int seconds) throws SQLException {
   }

   @Override
   public <T> T unwrap(Class<T> iface) throws SQLException {
      return null;
   }

   @Override
   public boolean isWrapperFor(Class<?> iface) throws SQLException {
      return false;
   }

   EmbeddedDataSource getDelegate() {
      return delegate;
   }

   @Override
   public Logger getParentLogger() throws SQLFeatureNotSupportedException {
      return null;
   }
}