content: /*
   * 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.kafka.connect.runtime.isolation;
  
  import org.apache.kafka.connect.sink.SinkConnector;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.junit.jupiter.MockitoExtension;
  import org.mockito.junit.jupiter.MockitoSettings;
  import org.mockito.quality.Strictness;
  
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.util.Collections;
  import java.util.SortedSet;
  import java.util.TreeSet;
  
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  @ExtendWith(MockitoExtension.class)
  @MockitoSettings(strictness = Strictness.STRICT_STUBS)
  public class DelegatingClassLoaderTest {
  
      public PluginClassLoader parent;
      public PluginClassLoader pluginLoader;
      public DelegatingClassLoader classLoader;
      public PluginDesc<SinkConnector> pluginDesc;
      public PluginScanResult scanResult;
  
      // Arbitrary values, their contents is not meaningful.
      public static final String ARBITRARY = "arbitrary";
      public static final Class<?> ARBITRARY_CLASS = org.mockito.Mockito.class;
      public static final URL ARBITRARY_URL;
  
      static {
          try {
              ARBITRARY_URL = new URL("jar:file://" + ARBITRARY + "!/" + ARBITRARY);
          } catch (MalformedURLException e) {
              throw new RuntimeException(e);
          }
      }
  
      @BeforeEach
      @SuppressWarnings({"unchecked"})
      public void setUp() {
          parent = mock(PluginClassLoader.class);
          pluginLoader = mock(PluginClassLoader.class);
          classLoader = new DelegatingClassLoader(parent);
          SortedSet<PluginDesc<SinkConnector>> sinkConnectors = new TreeSet<>();
          // Lie to the DCL that this arbitrary class is a connector, since all real connector classes we have access to
          // are forced to be non-isolated by PluginUtils.shouldLoadInIsolation.
          when(pluginLoader.location()).thenReturn("some-location");
          pluginDesc = new PluginDesc<>((Class<? extends SinkConnector>) ARBITRARY_CLASS, null, PluginType.SINK, pluginLoader);
          assertTrue(PluginUtils.shouldLoadInIsolation(pluginDesc.className()));
          sinkConnectors.add(pluginDesc);
          scanResult = new PluginScanResult(
                  sinkConnectors,
                  Collections.emptySortedSet(),
                  Collections.emptySortedSet(),
                  Collections.emptySortedSet(),
                  Collections.emptySortedSet(),
                  Collections.emptySortedSet(),
                  Collections.emptySortedSet(),
                  Collections.emptySortedSet(),
                  Collections.emptySortedSet()
          );
      }
  
      @Test
      public void testEmptyConnectorLoader() {
          assertSame(classLoader, classLoader.connectorLoader(ARBITRARY));
      }
  
      @Test
      @SuppressWarnings({"unchecked", "rawtypes"})
      public void testEmptyLoadClass() throws ClassNotFoundException {
          when(parent.loadClass(ARBITRARY, false)).thenReturn((Class) ARBITRARY_CLASS);
          assertSame(ARBITRARY_CLASS, classLoader.loadClass(ARBITRARY, false));
      }
  
      @Test
      public void testEmptyGetResource() {
          when(parent.getResource(ARBITRARY)).thenReturn(ARBITRARY_URL);
          assertSame(ARBITRARY_URL, classLoader.getResource(ARBITRARY));
      }
  
      @Test
      public void testInitializedConnectorLoader() {
          classLoader.installDiscoveredPlugins(scanResult);
          assertSame(pluginLoader, classLoader.connectorLoader(PluginUtils.prunedName(pluginDesc)));
          assertSame(pluginLoader, classLoader.connectorLoader(PluginUtils.simpleName(pluginDesc)));
          assertSame(pluginLoader, classLoader.connectorLoader(pluginDesc.className()));
      }
  
      @Test
      @SuppressWarnings({"unchecked", "rawtypes"})
      public void testInitializedLoadClass() throws ClassNotFoundException {
          classLoader.installDiscoveredPlugins(scanResult);
          String className = pluginDesc.className();
          when(pluginLoader.loadClass(className, false)).thenReturn((Class) ARBITRARY_CLASS);
          assertSame(ARBITRARY_CLASS, classLoader.loadClass(className, false));
      }
  }
  