/**
   * 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}

	bootstrapTraceMsgFirstTime := func(s string) {
		if firstTime {
			bootstrapTraceMsg(s)
		}
	}

	if iamOS.objAPI == nil {
		return errServerNotInitialized
	}

	bootstrapTraceMsgFirstTime("loading all IAM items")

	setDefaultCannedPolicies(cache.iamPolicyDocsMap)

	listStartTime := UTCNow()
	listedConfigItems, err := iamOS.listAllIAMConfigItems(ctx)
	if err != nil {

This can be very useful for setting up **resources** that you need to use for the whole app, and that are **shared** among requests, and/or that you need to **clean up** afterwards. For example, a database connection pool, or loading a shared machine learning model.

## Use Case { #use-case }

Let's start with an example **use case** and then see how to solve it with this.

			bootstrapTraceMsgFirstTime("loading regular users")
			if err := store.loadUsers(ctx, regUser, newCache.iamUsersMap); err != nil {
				return err
			}
			bootstrapTraceMsgFirstTime("loading regular groups")
			if err := store.loadGroups(ctx, newCache.iamGroupsMap); err != nil {
				return err
			}
		}

		bootstrapTraceMsgFirstTime("loading user policy mapping")
		// load polices mapped to users

        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");

   * 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

    }

    @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;

## 🔧 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)

    private static final int ST_EXT = 5;

    private final byte[] in;
    private int inLen;

    /**
     * Creates a new MimeMap instance by loading MIME type mappings from the resource file.
     *
     * @throws IOException if there is an error reading the mime.map resource file
     */
    public MimeMap() throws IOException {
        int n;

        in = new byte[IN_SIZE];

        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());