/*
 *  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
 *
 *    https://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.grails.datastore.mapping.core.connections

import groovy.transform.CompileStatic

import org.springframework.core.env.PropertyResolver

import org.grails.datastore.mapping.core.exceptions.ConfigurationException

/**
 * Initializer sequence for creating {@link ConnectionSources}
 *
 * @author Graeme Rocher
 * @since 6.0
 */
@CompileStatic
class ConnectionSourcesInitializer {

    /**
     * Creates the {@link ConnectionSources} for the given factory and configuration
     *
     * @param connectionSourceFactory The factory
     * @param configuration The configuration
     * @return The {@link ConnectionSources}
     */
    static <T,S extends ConnectionSourceSettings> ConnectionSources create(ConnectionSourceFactory<T, S> connectionSourceFactory, PropertyResolver configuration) {
        ConnectionSource defaultConnectionSource = connectionSourceFactory.create(ConnectionSource.DEFAULT, configuration)
        Class<ConnectionSources> connectionSourcesClass = defaultConnectionSource.getSettings().getConnectionSourcesClass()

        if (connectionSourcesClass == null) {
            return new InMemoryConnectionSources(defaultConnectionSource, connectionSourceFactory, configuration)
        }
        else {
            try {
                return connectionSourcesClass.newInstance(defaultConnectionSource, connectionSourceFactory, configuration)
            } catch (Throwable e) {
                throw new ConfigurationException("Cannot instantiate custom ConnectionSources implementation: $e.message", e)
            }
        }
    }
}
