hazelcast-master/hazelcast/src/main/java/com/hazelcast/instance/impl/DuplicatedResourcesScanner.java
/*
 * Copyright (c) 2008-2023, 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.impl;

import com.hazelcast.logging.ILogger;

import java.io.IOException;
import java.net.URL;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

final class DuplicatedResourcesScanner {

    private DuplicatedResourcesScanner() {
    }

    static void checkForDuplicates(ClassLoader classLoader, ILogger logger, String resourceName) {
        try {
            List<URL> resources = Collections.list(classLoader.getResources(resourceName));
            if (resources.size() > 1) {
                String formattedResourceUrls = resources.stream().map(URL::toString).collect(Collectors.joining(", "));
                logger.warning("WARNING: Classpath misconfiguration: found multiple " + resourceName
                        + " resources: " + formattedResourceUrls);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
