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/*
 * 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.asterix.metadata.functions;

import java.util.HashMap;
import java.util.Map;

public class ExternalLibraryManager {

    private static Map libraryClassLoaders = new HashMap();

    public static void registerLibraryClassLoader(String dataverseName, String libraryName, ClassLoader classLoader) {
        String key = getKey(dataverseName, libraryName);
        synchronized (libraryClassLoaders) {
            if (libraryClassLoaders.get(dataverseName) != null) {
                throw new IllegalStateException("Library class loader already registered!");
            }
            libraryClassLoaders.put(key, classLoader);
        }
    }

    public static void deregisterLibraryClassLoader(String dataverseName, String libraryName) {
        String key = getKey(dataverseName, libraryName);
        synchronized (libraryClassLoaders) {
            if (libraryClassLoaders.get(dataverseName) != null) {
                libraryClassLoaders.remove(key);
            }
        }
    }

    public static ClassLoader getLibraryClassLoader(String dataverseName, String libraryName) {
        String key = getKey(dataverseName, libraryName);
        synchronized (libraryClassLoaders) {
            return libraryClassLoaders.get(key);
        }
    }

    private static String getKey(String dataverseName, String libraryName) {
        return dataverseName + "." + libraryName;
    }

}