/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * 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 com.hazelcast.instance;

import com.hazelcast.logging.Logger;
import com.hazelcast.spi.annotation.PrivateApi;
import com.hazelcast.util.ExceptionUtil;
import com.hazelcast.util.ServiceLoader;

import java.lang.reflect.Constructor;
import java.util.Iterator;

@PrivateApi
public final class NodeExtensionFactory {

    private static final String FACTORY_ID = "com.hazelcast.instance.NodeExtension";

    private NodeExtensionFactory() {
    }

    public static NodeExtension create(Node node) {
        try {
            ClassLoader classLoader = node.getConfigClassLoader();
            Iterator<Class<NodeExtension>> iter = ServiceLoader.classIterator(NodeExtension.class, FACTORY_ID, classLoader);
            while (iter.hasNext()) {
                Class<NodeExtension> clazz = iter.next();
                if (!(clazz.equals(DefaultNodeExtension.class))) {
                    if (clazz.getName().equals(DefaultNodeExtension.class.getName())) {
                        Logger.getLogger(NodeExtensionFactory.class).warning(
                                "DefaultNodeExtension class has been loaded by two different class-loaders. "
                                        + "Classloader 1: " + NodeExtensionFactory.class.getClassLoader() + ", "
                                        + "Classloader 2: " + clazz.getClassLoader() + ". "
                                        + "Are you running Hazelcast in an OSGi environment? "
                                        + "If so, set the bundle class-loader in the Config using the setClassloader() method");
                    }
                    Constructor<NodeExtension> constructor = clazz
                            .getDeclaredConstructor(new Class[]{Node.class});
                    return constructor.newInstance(node);
                }
            }
        } catch (Exception e) {
            throw ExceptionUtil.rethrow(e);
        }
        return new DefaultNodeExtension(node);
    }
}