/*
 * Copyright 2013-2026, Seqera Labs
 *
 * 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 nextflow.container.resolver


import nextflow.plugin.Plugins
/**
 * Load an instance of {@link ContainerResolver}
 *
 * @author Paolo Di Tommaso <paolo.ditommaso@gmail.com>
 */
class ContainerResolverProvider {

    /**
     * Load the {@link ContainerResolver} instance via the plugin system.
     *
     * Use `synchronized` method to make it thread safe and prevent multiple instances
     * of the same resolver type
     *
     * @return The {@link ContainerResolver} instance
     */
    static synchronized ContainerResolver load() {
        final resolver = Plugins
            .getPriorityExtensions(ContainerResolver)
            .find( it-> it.enabled() )
        if( !resolver )
            throw new IllegalStateException("Cannot load ${ContainerResolver.class.simpleName}")
        return resolver
    }

}
