@Test
    @DisplayName("Test mixed success and failure pattern")
    void testMixedPattern() throws Exception {
        // Success
        circuitBreaker.call(() -> "success");

        // Two failures (not enough to open)
        for (int i = 0; i < 2; i++) {
            try {
                circuitBreaker.call(() -> {
                    throw new RuntimeException("Test failure");
                });

    }

    /**
     * Get current failure threshold (may be dynamically adjusted)
     *
     * @return current failure threshold
     */
    public int getCurrentFailureThreshold() {
        return failureThreshold;
    }

    /**
     * Update failure threshold (for dynamic adjustment)
     *
     * @param newThreshold the new failure threshold
     */

    }

    /**
     * Constructs an SMB signature validation exception with message and cause.
     *
     * @param msg the detail message describing the validation failure
     * @param rootCause the underlying cause of the validation failure
     */
    public SMBSignatureValidationException(final String msg, final Throwable rootCause) {
        super(msg, rootCause);
    }

    /**

     *
     * @param from The previous state that is being transitioned from. Failure can occur in any
     *     state with the exception of {@linkplain State#NEW NEW} or {@linkplain State#TERMINATED
     *     TERMINATED}.
     * @param failure The exception that caused the failure.
     */
    public void failed(State from, Throwable failure) {}
  }

    target = requestLine.target,
    version = requestLine.version,
    url = requestUrl,
    headers = headers,
    body = body,
    bodySize = bodySize,
    chunkSizes = chunkSizes,
    failure = failure,
  )
}

internal fun decodeRequestLine(requestLine: String?): RequestLine {
  val parts =
    when {
      requestLine != null -> requestLine.split(' ', limit = 3)

  /** Constructor for use by subclasses. */
  protected InternalFutureFailureAccess() {}

  /**
   * Usually returns {@code null} but, if this {@code Future} has failed, may <i>optionally</i>
   * return the cause of the failure. "Failure" means specifically "completed with an exception"; it
   * does not include "was cancelled." To be explicit: If this method returns a non-null value,
   * then:
   *
   * <ul>

            when {
              tcpConnectResult.isSuccess -> plan.connectTlsEtc()
              else -> tcpConnectResult
            }

          val (_, nextPlan, failure) = connectResult

          if (failure != null) throw failure
          if (nextPlan != null) {
            routePlanner.deferredPlans.addFirst(nextPlan)
            continue
          }
        }
        return plan.handleSuccess()

import org.lastaflute.web.response.ApiResponse;
import org.lastaflute.web.response.JsonResponse;

/**
 * The hook for API failure.
 *
 * @author jflute
 */
public class FessApiFailureHook implements ApiFailureHook { // #change_it for handling API failure

    private static final Logger logger = LogManager.getLogger(FessApiFailureHook.class);

    assertTrue(future.setException(new Exception("failure")));
    tester.testFailedFuture("failure");
  }

  public void testSetFailureNull() throws Exception {
    assertThrows(NullPointerException.class, () -> future.setException(null));
    assertFalse(future.isDone());
    assertTrue(future.setException(new Exception("failure")));
    tester.testFailedFuture("failure");
  }

  public void testCancel() throws Exception {

      checkArgument(
          (failure != null) == (internalState == FAILED),
          "A failure cause should be set if and only if the state is failed.  Got %s and %s "
              + "instead.",
          internalState,
          failure);
      this.state = internalState;
      this.shutdownWhenStartupFinishes = shutdownWhenStartupFinishes;
      this.failure = failure;
    }

    /**