# InMemoryDataSourceRepository.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.
     */
    /**
     * To change this template use File | Settings | File Templates.
     */
    package org.apache.synapse.commons.datasource;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.synapse.commons.SynapseCommonsException;
    import org.apache.synapse.commons.datasource.factory.DataSourceFactory;
    import org.apache.synapse.commons.jmx.MBeanRepository;

    import javax.sql.DataSource;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Properties;

    /**
     * Keeps all DataSources in the memory
     */
    public class InMemoryDataSourceRepository implements DataSourceRepository {

        private final static Log log = LogFactory.getLog(InMemoryDataSourceRepository.class);

        private final Map<String, DataSource> dataSources = new HashMap<String, DataSource>();
        private static final MBeanRepository REPOSITORY = DatasourceMBeanRepository.getInstance();

        public InMemoryDataSourceRepository() {
        }

        /**
         * Keep DataSource in the Local store.
         *
         * @param dataSourceInformation the information describing a data source
         * @see DataSourceRepository#register(DataSourceInformation)
         */
        public void register(DataSourceInformation dataSourceInformation) {

            if (dataSourceInformation == null) {
                throw new SynapseCommonsException("DataSourceInformation cannot be found.", log);
            }

            DataSource dataSource = DataSourceFactory.createDataSource(dataSourceInformation);

            if (dataSource == null) {

                if (log.isDebugEnabled()) {
                    log.debug("DataSource cannot be created or" +
                            " found for DataSource Information " + dataSourceInformation);
                }
                return;
            }

            String name = dataSourceInformation.getDatasourceName();

            if (log.isDebugEnabled()) {
                log.debug("Registering a DatSource with name : " + name + " in Local Pool");
            }

            REPOSITORY.addMBean(name, new DBPoolView(name));
            dataSources.put(name, dataSource);
        }

        public void unRegister(String name) {

            if (name == null || "".equals(name)) {
                throw new SynapseCommonsException("Name of the datasource to be removed is empty or " +
                        "null", log);
            }

            dataSources.remove(name);
            REPOSITORY.removeMBean(name);
        }

        /**
         * Get a DataSource from Local store
         *
         * @see DataSourceRepository#lookUp(String)
         */
        public DataSource lookUp(String name) {

            if (name == null || "".equals(name)) {
                throw new SynapseCommonsException("Name of the datasource to be looked up is empty or" +
                        "null", log);
            }

            return dataSources.get(name);
        }

        public void init(Properties properties) {
            // nothing
        }

        public boolean isInitialized() {
            return true;
        }

        public void clear() {
            if (!dataSources.isEmpty()) {
                log.info("Clearing all in-memory datasources ");
                dataSources.clear();
            }
            REPOSITORY.clear();
        }
    }