/**
   * Returns a cache loader that uses {@code function} to load keys, without supporting either
   * reloading or bulk loading. This allows creating a cache loader using a lambda expression.
   *
   * <p>The returned object is serializable if {@code function} is serializable.
   *
   * @param function the function to be used for loading values; must never return {@code null}

   * segments, each governed by its own write lock. The segment lock is taken once for each explicit
   * write, and twice for each cache loading computation (once prior to loading the new value, and
   * once after loading completes). Much internal cache management is performed at the segment
   * granularity. For example, access queues and write queues are kept per segment when they are

      return this;
    }

    public void setLoading(boolean loading) {
      this.loading = loading;
    }

    @Override
    public boolean isLoading() {
      return loading;
    }

    @Override
    public boolean isActive() {
      return !loading;
    }

    @Override
    public V waitForValue() {
      return get();
    }

        assertTrue(exception instanceof Throwable);
    }

    public void test_throwAndCatch() {
        // Test throwing and catching PluginException
        String expectedMessage = "Plugin loading failed";

        try {
            throw new PluginException(expectedMessage);
        } catch (PluginException e) {
            assertEquals(expectedMessage, e.getMessage());
            assertNull(e.getCause());

        assertEquals(loadedUser, result);
        assertEquals(1, chain.loadCallCount);
        assertEquals(user, chain.lastLoadedUser);
    }

    // Test load with multiple chains (chained loading)
    public void test_load_multipleChains() {
        User user = createTestUser("user0");
        User user1 = createTestUser("user1");
        User user2 = createTestUser("user2");

    }

    @Override
    public int hashCode() {
      return value.hashCode();
    }
  }

  /**
   * LocalManualCache is a wrapper around LocalCache for a cache without loading.
   *
   * @param <K> the base key type
   * @param <V> the base value type
   */
  public static class LocalManualCache<K, V> extends AbstractCache<K, V> {
    final LocalCache<K, V> localCache;

    }

    // Test with a custom ClassLoader to simulate class availability
    public void test_hook_withCustomClassLoader() throws Exception {
        // Create a custom ClassLoader that can control class loading behavior
        ClassLoader customClassLoader = new URLClassLoader(new URL[0], null) {
            @Override
            public Class<?> loadClass(String name) throws ClassNotFoundException {

## 🔧 Configuration

### Logging Configuration
CoreLib supports multiple logging frameworks. Configure your preferred logger:

```java
// Use with SLF4J (add slf4j-api dependency)
Logger logger = Logger.getLogger(MyClass.class);

// Use with Commons Logging (add commons-logging dependency)  
Logger logger = Logger.getLogger(MyClass.class);

// Use with Java Util Logging (built-in)

        assertEquals(longMessage, exception.getMessage());
    }

    public void test_throwAndCatch() {
        // Test throwing and catching the exception
        String expectedMessage = "Theme loading error";

        try {
            throw new ThemeException(expectedMessage);
        } catch (ThemeException e) {
            assertEquals(expectedMessage, e.getMessage());
            assertNull(e.getCause());

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.misc.Tuple3;
import org.codelibs.fess.Constants;
import org.codelibs.fess.entity.SearchRequestParams.SearchRequestType;