// checks on the _original_ iterable when FluentIterable.from is used.
  // To avoid a self retain cycle under j2objc, we store null instead of
  // a reference to 'this'. To access the delegate iterable, call #getDelegate(), which converts
  // null back to 'this'.
  private final @Nullable Iterable<E> iterableDelegate;

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

  /**
   * Opens a new buffered {@link InputStream} for reading from this source. The returned stream is
   * not required to be a {@link BufferedInputStream} in order to allow implementations to simply
   * delegate to {@link #openStream()} when the stream returned by that method does not benefit from
   * additional buffering (for example, a {@code ByteArrayInputStream}). This method returns a new,
   * independent stream each time it is called.

        if (proxy != null && !Proxy.NO_PROXY.equals(proxy)) {
            request.proxy(proxy);
        }
        return request;
    }

    /**
     * Deletes an installed artifact.
     *
     * @param artifact the artifact to delete
     * @throws PluginException if the artifact does not exist or deletion fails
     */

            deleteDirectory(tempDir.toFile());
        }
    }

    @Test
    public void test_atomicDeleteIfExists_existingFile() throws Exception {
        // Test that Files.deleteIfExists deletes existing file atomically
        Path tempFile = Files.createTempFile("toctou_cmd_test", ".tmp");
        try {
            assertTrue(Files.exists(tempFile));

      assertFalse(Files.exists(symlink, NOFOLLOW_LINKS));
      assertTrue(Files.isDirectory(realSymlinkTarget, NOFOLLOW_LINKS));
    }
  }

  /**
   * Starts a new task on the given executor that switches (deletes and replaces) a file between
   * being a directory and being a symlink. The given {@code file} is the file that should switch
   * between being a directory and being a symlink, while the given {@code target} is the target the

    //                                                             ============

    @Test
    public void test_tryStartOperation_singleArg_delegatesToTwoArg() {
        // tryStartOperation(name) should delegate to tryStartOperation(name, null)
        final AtomicReference<String> passedData = new AtomicReference<>("NOT_NULL");
        final CoordinatorHelper helper = new CoordinatorHelper() {
            @Override

    orig.setFuture(
        new ForwardingListenableFuture<Object>() {
          @Override
          protected ListenableFuture<Object> delegate() {
            return orig;
          }
        });
    assertThat(orig.toString())
        .contains("Exception thrown from implementation: class java.lang.StackOverflowError");
  }

    class Bar<T> {}
    class SubBar<T> extends Bar<T> {
      @Keep Bar<T> delegate;

      TypeToken<SubBar<T>> fieldTypeAsSubBar() {
        return new TypeToken<SubBar<T>>() {};
      }
    }

    Field delegateField = SubBar.class.getDeclaredField("delegate");
    // barType is Bar<T>, a ParameterizedType with no generic arguments specified

                } catch (final Exception e) {
                    logger.warn("Failed to handle event: eventName={}", event.name, e);
                }
            }
        }
    }

    /**
     * Deletes expired heartbeat, operation, and event documents from the coordinator index.
     */
    protected void cleanupExpiredDocuments() {
        final long now = System.currentTimeMillis();

ensuite, vous démarrez **plusieurs processus** (plusieurs workers) pour l'application elle‑même. Si ces étapes étaient exécutées par **plusieurs processus**, ils **dupliqueraient** le travail en l'exécutant **en parallèle**, et si les étapes étaient délicates comme une migration de base de données, elles pourraient entrer en conflit les unes avec les autres.

Bien sûr, il y a des cas où il n'y a aucun problème à exécuter les étapes préalables plusieurs fois ; dans ce cas, c'est beaucoup plus...