return lockedGetOrLoad(key, hash, loader);
      } catch (ExecutionException ee) {
        Throwable cause = ee.getCause();
        if (cause instanceof Error) {
          throw new ExecutionError((Error) cause);
        } else if (cause instanceof RuntimeException) {
          throw new UncheckedExecutionException(cause);
        }
        throw ee;
      } finally {
        postReadCleanup();
      }
    }

            assertEquals(defaultValue, mimeMap.getMimeType("notinmap", defaultValue));
        }
    }

    @Nested
    @DisplayName("Edge cases and special scenarios")
    class EdgeCases {

        @Test
        @DisplayName("Should handle multiple extensions for same mime type")
        void testMultipleExtensionsForSameMimeType() throws IOException {

 * allowed to be reclaimed if nobody is holding on to them. This is useful, for example, if one
 * wants to create a {@code Striped<Lock>} of many locks, but worries that in most cases only a
 * small portion of these would be in use.
 *
 * <p>Prior to this class, one might be tempted to use {@code Map<K, Lock>}, where {@code K}

---

**Note**: You can mix `def` and `async def` in your *path operation functions* as much as you need and define each one using the best option for you. FastAPI will do the right thing with them.

Anyway, in any of the cases above, FastAPI will still work asynchronously and be extremely fast.

But by following the steps above, it will be able to do some performance optimizations.

## Technical Details { #technical-details }

    switch (type) {
        case DURABLE_V1:
            addCreateContext(new DurableHandleRequest());
            break;
            
        case DURABLE_V2:
            addCreateContext(new DurableHandleV2Request(timeout, false));
            break;
            
        case PERSISTENT:
            addCreateContext(new DurableHandleV2Request(0, true));

    }
    inputFuture = null;

    if (localInputFuture.isCancelled()) {
      @SuppressWarnings("unchecked")
      boolean unused =
          setFuture((ListenableFuture<O>) localInputFuture); // Respects cancellation cause setting
      return;
    }

    /*
     * Any of the setException() calls below can fail if the output Future is cancelled between now

                        return pool.Index
                }
        }
        // Should not happen, but print values just in case.
        panic(fmt.Errorf("reached end of serverPools (total: %v, atTotal: %v, choose: %v)", total, atTotal, choose))
}
```

## Other usages

### Advanced use cases with multiple ellipses

Standalone erasure coded configuration with 4 sets with 16 drives each, which spawns drives across controllers.

     * and Joiner.on(...).useForNull(...) both declare the same return type: plain Joiner. To ensure
     * that users *can* pass null arguments to Joiner, we annotate it as if it always tolerates null
     * inputs, rather than as if it never tolerates them.
     *
     * We rely on checkers to implement special cases to catch dangerous calls to join(), etc. based

                                                      // from other methods
                        return ans;
                    }
                    break;
                case RESOLVER_WINS:
                case RESOLVER_BCAST:
                    if (resolverType == ResolverType.RESOLVER_WINS && name.name != NbtAddress.MASTER_BROWSER_NAME && name.hexCode != 0x1d) {
                        request.addr = getWINSAddress();

   *       // perform a unit of work
   *     }
   *   }
   * </pre>
   *
   * <p>...or you could respond to stop requests by implementing {@link #triggerShutdown()}, which
   * should cause {@link #run()} to return.
   */
  protected abstract void run() throws Exception;

  /**
   * Stop the service. This method is invoked on the execution thread.
   *
   * <p>By default this method does nothing.