PooledDataSourceRegistry.java

/*
 * (C) Copyright 2012-2013 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * Licensed 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.nuxeo.runtime.datasource;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import javax.naming.Context;
import javax.naming.Name;
import javax.naming.Reference;
import javax.sql.DataSource;

public class PooledDataSourceRegistry extends ReentrantReadWriteLock {

    private static final long serialVersionUID = 1L;

    public interface PooledDataSource extends DataSource {
        void dispose();

        Connection getConnection(boolean noSharing) throws SQLException;
    }

    protected final Map<String, PooledDataSource> pools = new HashMap<>();

    protected final PooledDataSourceFactory poolFactory = new org.nuxeo.runtime.datasource.PooledDataSourceFactory();

    public <T> T getPool(String name, Class<T> type) {
        return type.cast(pools.get(name));
    }

    public PooledDataSource getOrCreatePool(Object obj, Name objectName, Context nameCtx, Hashtable<?, ?> env) {
        final Reference ref = (Reference) obj;
        String dsName = (String) ref.get("name").getContent();
        PooledDataSource ds = pools.get(dsName);
        if (ds != null) {
            return ds;
        }
        return createPool(dsName, ref, objectName, nameCtx, env);
    }

    protected PooledDataSource createPool(String dsName, Reference ref, Name objectName, Context nameCtx, Hashtable<?, ?> env) {
        PooledDataSource ds;
        try {
            readLock().lock();
            ds = pools.get(dsName);
            if (ds != null) {
                return ds;
            }
            ds = (PooledDataSource) poolFactory.getObjectInstance(ref, objectName, nameCtx, env);
            pools.put(dsName, ds);
        } finally {
            readLock().unlock();
        }
        return ds;
    }

    protected void clearPool(String name) {
        PooledDataSource ds = pools.remove(name);
        if (ds != null) {
            ds.dispose();
        }
    }

    public void createAlias(String name, PooledDataSource pool) {
        pools.put(name, pool);
    }

}