minifi-nar-bundles/minifi-framework-bundle/minifi-framework/minifi-nar-utils/src/main/java/org/apache/nifi/nar/NarCloseable.java

/*
 * 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.nifi.nar;

import java.io.Closeable;

/**
 *
 */
public class NarCloseable implements Closeable {

    public static org.apache.nifi.nar.NarCloseable withNarLoader() {
        final ClassLoader current = Thread.currentThread().getContextClassLoader();
        Thread.currentThread().setContextClassLoader(NarThreadContextClassLoader.getInstance());
        return new org.apache.nifi.nar.NarCloseable(current);
    }

    private final ClassLoader toSet;

    private NarCloseable(final ClassLoader toSet) {
        this.toSet = toSet;
    }

    @Override
    public void close() {
        if (toSet != null) {
            Thread.currentThread().setContextClassLoader(toSet);
        }
    }
}