org.moneta.config.ConnectionPoolFactory.java Source code

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Here is the source code for org.moneta.config.ConnectionPoolFactory.java

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/*
 * This software is licensed under the Apache License, Version 2.0
 * (the "License") agreement; 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.moneta.config;

import java.beans.PropertyDescriptor;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.dbcp2.ConnectionFactory;
import org.apache.commons.dbcp2.DriverManagerConnectionFactory;
import org.apache.commons.dbcp2.PoolableConnection;
import org.apache.commons.dbcp2.PoolableConnectionFactory;
import org.apache.commons.lang.Validate;
import org.apache.commons.pool2.ObjectPool;
import org.apache.commons.pool2.impl.GenericObjectPool;
import org.moneta.error.MonetaException;
import org.moneta.types.topic.MonetaDataSource;

/**
 * Is able to convert a JDBC connect pool specification into a connection pool
 * @author D. Ashmore
 *
 */
class ConnectionPoolFactory {

    public static ObjectPool<PoolableConnection> createConnectionPool(MonetaDataSource dataSourceType) {
        Validate.notNull(dataSourceType, "Null MonetaDataSource not allowed.");

        Validate.notEmpty(dataSourceType.getDataSourceName(), "Null or blank name not allowed");
        Validate.notEmpty(dataSourceType.getConnectionUrl(), "Null or blank url not allowed");
        Validate.notNull(dataSourceType.getDriver(), "Null driver not allowed");

        try {
            dataSourceType.getDriver().newInstance();
        } catch (Exception e) {
            throw new MonetaException("Data source JDBC driver can't be instantiated", e)
                    .addContextValue("JDBC Driver class", dataSourceType.getDriver().getName());
        }

        Properties connectionProps = new Properties();
        connectionProps.putAll(dataSourceType.getJdbcConnectionProperties());
        ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(dataSourceType.getConnectionUrl(),
                connectionProps);

        ObjectName poolName = null;
        try {
            poolName = new ObjectName("org.moneta", "connectionPool", dataSourceType.getDataSourceName());
        } catch (MalformedObjectNameException e) {
            throw new MonetaException("Data source name not valid", e).addContextValue("Data source name",
                    dataSourceType.getDataSourceName());
        }
        PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory(connectionFactory,
                poolName);

        Set<String> unusedConnectionPoolPropSet = new HashSet<String>();
        Map<String, String> propMap = new HashMap<String, String>(dataSourceType.getConnectionPoolProperties());

        PropertyDescriptor pDesc = null;
        for (String propName : propMap.keySet()) {
            pDesc = assignProperty(dataSourceType.getDataSourceName(), poolableConnectionFactory, propName,
                    propMap.get(propName));
            if (pDesc == null) {
                unusedConnectionPoolPropSet.add(propName);
            }
        }

        GenericObjectPool<PoolableConnection> pool = new GenericObjectPool<PoolableConnection>(
                poolableConnectionFactory);
        poolableConnectionFactory.setPool(pool);

        for (String propName : new HashSet<String>(unusedConnectionPoolPropSet)) {
            pDesc = assignProperty(dataSourceType.getDataSourceName(), pool, propName, propMap.get(propName));
            if (pDesc != null) {
                unusedConnectionPoolPropSet.remove(propName);
            }
        }

        if (unusedConnectionPoolPropSet.size() > 0) {
            MonetaException me = new MonetaException("Invalid connection pool properties detected");
            for (String propName : unusedConnectionPoolPropSet) {
                me.addContextValue("pool property name", propName);
            }

            throw me;
        }
        return pool;
    }

    protected static PropertyDescriptor assignProperty(String dataSourceName, Object poolRelatedBean,
            String propName, String propValue) {
        PropertyDescriptor pDesc = null;
        try {
            pDesc = PropertyUtils.getPropertyDescriptor(poolRelatedBean, propName);
        } catch (Exception e) {
            throw new MonetaException("Connection pool property not valid")
                    .addContextValue("Data source name", dataSourceName).addContextValue("Property name", propName);
        }

        if (pDesc == null) {
            return null;
        }

        try {
            PropertyUtils.setProperty(poolRelatedBean, propName,
                    ValueNormalizationUtil.convertString(pDesc.getPropertyType(), propValue));
        } catch (Exception e) {
            throw new MonetaException("Error setting connection pool property", e)
                    .addContextValue("Data source name", dataSourceName).addContextValue("Property name", propName);
        }
        return pDesc;
    }

}