/**
 * 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.bookkeeper.mledger.offload;

import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PowerMockIgnore;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.testng.IObjectFactory;
import org.testng.annotations.ObjectFactory;
import org.testng.annotations.Test;

import static org.mockito.ArgumentMatchers.eq;
import static org.testng.Assert.assertSame;

@PrepareForTest({OffloaderUtils.class})
@PowerMockIgnore({"org.apache.logging.log4j.*", "org.apache.pulsar.common.nar.*"})
public class OffloadersCacheTest {

    // Necessary to make PowerMockito.mockStatic work with TestNG.
    @ObjectFactory
    public IObjectFactory getObjectFactory() {
        return new org.powermock.modules.testng.PowerMockObjectFactory();
    }

    @Test
    public void testLoadsOnlyOnce() throws Exception {
        Offloaders expectedOffloaders = new Offloaders();

        PowerMockito.mockStatic(OffloaderUtils.class);
        PowerMockito.when(OffloaderUtils.searchForOffloaders(eq("./offloaders"), eq("/tmp")))
                .thenReturn(expectedOffloaders);

        OffloadersCache cache = new OffloadersCache();

        // Call a first time to load the offloader
        Offloaders offloaders1 = cache.getOrLoadOffloaders("./offloaders", "/tmp");

        assertSame(offloaders1, expectedOffloaders, "The offloaders should be the mocked one.");

        // Call a second time to get the stored offlaoder
        Offloaders offloaders2 = cache.getOrLoadOffloaders("./offloaders", "/tmp");

        assertSame(offloaders2, expectedOffloaders, "The offloaders should be the mocked one.");
    }
}