/**
* 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
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* 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 jug.routing;
import org.apache.openejb.resource.jdbc.router.AbstractRouter;
import javax.naming.NamingException;
import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
public class PollingRouter extends AbstractRouter {
private Map<String, DataSource> dataSources = null;
private ThreadLocal<DataSource> currentDataSource = new ThreadLocal<DataSource>() {
@Override
public DataSource initialValue() {
return dataSources.get("jdbc/client1");
}
};
@Override
public DataSource getDataSource() {
if (dataSources == null) {
init();
}
return currentDataSource.get();
}
public void setDataSource(final String client) {
if (dataSources == null) {
init();
}
final String datasourceName = "jdbc/" + client;
if (!dataSources.containsKey(datasourceName)) {
throw new IllegalArgumentException("data source called " + datasourceName + " can't be found.");
}
final DataSource ds = dataSources.get(datasourceName);
currentDataSource.set(ds);
}
private synchronized void init() {
if (dataSources != null) {
return;
}
dataSources = new HashMap<String, DataSource>();
for (String ds : Arrays.asList("jdbc/client1", "jdbc/client2")) {
try {
final Object o = getOpenEJBResource(ds);
if (o instanceof DataSource) {
dataSources.put(ds, DataSource.class.cast(o));
}
} catch (NamingException e) {
// ignored
}
}
}
public void clear() {
currentDataSource.remove();
}
}