/*
 * 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.
 */

package org.apache.shardingsphere.elasticjob.lite.internal.setup;

import lombok.AccessLevel;
import lombok.NoArgsConstructor;

import java.util.LinkedList;
import java.util.List;
import java.util.ServiceLoader;

/**
 * Job class name provider factory.
 */
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public final class JobClassNameProviderFactory {
    
    private static final List<JobClassNameProvider> PROVIDERS = new LinkedList<>();
    
    private static final JobClassNameProvider DEFAULT_PROVIDER = new DefaultJobClassNameProvider();
    
    static {
        for (JobClassNameProvider each : ServiceLoader.load(JobClassNameProvider.class)) {
            PROVIDERS.add(each);
        }
    }
    
    /**
     * Get the first job class name provider.
     *
     * @return job class name provider
     */
    public static JobClassNameProvider getProvider() {
        return PROVIDERS.isEmpty() ? DEFAULT_PROVIDER : PROVIDERS.get(0);
    }
}
