import java.io.Serializable;
import java.util.Map;
import java.util.concurrent.Executor;

/**
 * Computes or retrieves values, based on a key, for use in populating a {@link LoadingCache}.
 *
 * <p>Most implementations will only need to implement {@link #load}. Other methods may be
 * overridden as desired.
 *
 * <p>Usage example:
 *
 * {@snippet :
 * CacheLoader<Key, Graph> loader = new CacheLoader<Key, Graph>() {

      setException(t);
      return;
    } finally {
      function = null;
    }

    /*
     * If set()/setValue() throws an Error, we let it propagate. Why? The most likely Error is a
     * StackOverflowError (from deep transform(..., directExecutor()) nesting), and calling
     * setException(stackOverflowError) would fail:
     *

        DummyPlainSMB next = new DummyPlainSMB();
        DummyAndXBlock block = new DummyAndXBlock(next);
        block.customBatchLimit = 1; // allow 1, but we'll set batchLevel to meet limit
        block.batchLevel = 1; // batchLevel >= limit prevents chaining

        byte[] buf = new byte[128];
        int n = block.writeAndXWireFormat(buf, 0);

        assertTrue(n > 0);

                    this.sidCache.put(resolved[si], resolved[si]);
                }
            }
        }
    }

    /**
     * Resolve an array of SIDs using a cache and at most one MSRPC request.
     * <p>
     * This method will attempt
     * to resolve SIDs using a cache and cache the results of any SIDs that
     * required resolving with the authority. SID cache entries are currently not

  /** Creates a new {@link Closer}. */
  public static Closer create() {
    return new Closer(SUPPRESSING_SUPPRESSOR);
  }

  @VisibleForTesting final Suppressor suppressor;

  // only need space for 2 elements in most cases, so try to use the smallest array possible
  private final Deque<Closeable> stack = new ArrayDeque<>(4);
  private @Nullable Throwable thrown;

  @VisibleForTesting
  Closer(Suppressor suppressor) {

Actually, all (or most) of the web frameworks work in this same way.

You never call those functions directly. They are called by your framework (in this case, **FastAPI**).

    private Configuration mockConfig;

    @Mock
    private Smb2WriteResponse mockWriteResponse;

    private SmbFileOutputStream outputStream;

    @BeforeEach
    void setUp() {
        // Common setup for most tests
        lenient().when(mockFileHandle.getTree()).thenReturn(mockTreeHandle);
        lenient().when(mockTreeHandle.getConfig()).thenReturn(mockConfig);
    }

    @Test

     * <p>
     * This method traverses the parent hierarchy and collects all active profiles from
     * the current project and its ancestors. Active profiles are those that meet the
     * activation criteria through explicit activation or automatic conditions.
     * <p>
     * The combined set of active profiles from the entire project hierarchy affects
     * the effective build configuration.

  taskRunner: TaskRunner,
) : Closeable,
  Flushable {
  /** Create a cache of at most [maxSize] bytes in [directory]. */
  constructor(
    fileSystem: FileSystem,
    directory: Path,
    maxSize: Long,
  ) : this(
    directory,
    maxSize,
    fileSystem,
    TaskRunner.INSTANCE,
  )

  /** Create a cache of at most [maxSize] bytes in [directory]. */
  constructor(directory: File, maxSize: Long) : this(

    }

    fun assumeNotCorretto() {
      assumeTrue(getPlatformSystemProperty() != CORRETTO_PROPERTY)
    }

    fun assumeNotBouncyCastle() {
      // Most failures are with MockWebServer
      // org.bouncycastle.tls.TlsFatalAlertReceived: handshake_failure(40)
      //        at org.bouncycastle.tls.TlsProtocol.handleAlertMessage(TlsProtocol.java:241)