* This class provides DCE/RPC interface for SAM database operations including
 * user account management, group operations, and domain security functions.
 */
public class samr {

    /**
     * Private constructor to prevent instantiation of utility class.
     */
    private samr() {
        // Utility class
    }

    /**
     * Returns the RPC interface syntax UUID and version for SAMR protocol.
     *

// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This wrapper uses syscall.Flock to prevent concurrent adb commands,
// so for now it only builds on platforms that support that system call.
// TODO(#33974): use a more portable library for file locking.

//go:build darwin || dragonfly || freebsd || illumos || linux || netbsd || openbsd

ولی قبل از اون، مدیریت کد ناهم‌زمان خیلی پیچیده‌تر و سخت‌تر بود.

توی نسخه‌های قبلی پایتون، می‌تونستی از نخ‌ها یا <a href="https://www.gevent.org/" class="external-link" target="_blank">Gevent</a> استفاده کنی. ولی کد خیلی پیچیده‌تر می‌شه برای فهمیدن، دیباگ کردن و فکر کردن بهش.

توی نسخه‌های قبلی NodeJS / جاوااسکریپت مرورگر، از "کال‌بک‌ها" استفاده می‌کردی. که می‌رسید به "جهان کال‌بک‌ها".

        return false;
      }
    };

    static final JavaVersion CURRENT;

    static {
      // Under Android, TypeVariable does not implement AnnotatedElement even under recent versions.
      if (AnnotatedElement.class.isAssignableFrom(TypeVariable.class)) {
        if (new TypeCapture<Entry<String, int[][]>>() {}.capture()
            .toString()

        } catch (Exception e) {
            log.error("Error during tree finalization", e);
        } finally {
            super.finalize();
        }
    }

    /**
     * Emergency cleanup method to prevent memory leaks during finalization
     */
    private void emergencyCleanup() {
        try {
            // Force usage count to zero
            this.usageCount.set(0);

            synchronized (this) {

    long product = LongMath.factorials[startingNumber - 1];
    // Strip off 2s from this value.
    int shift = Long.numberOfTrailingZeros(product);
    product >>= shift;

    // Use floor(log2(num)) + 1 to prevent overflow of multiplication.
    int productBits = LongMath.log2(product, FLOOR) + 1;
    int bits = LongMath.log2(startingNumber, FLOOR) + 1;
    // Check for the next power of two boundary, to save us a CLZ operation.

 *       these guarantees to be violated).
 * </ul>
 *
 * <h4>"Interfaces", not implementations</h4>
 *
 * <p>These are classes instead of interfaces to prevent external subtyping, but should be thought
 * of as interfaces in every important sense. Each public class such as {@link ImmutableSet} is a
 * <i>type</i> offering meaningful behavioral guarantees. This is substantially different from the

 * if/throw idiom instead.
 *
 * <p>Depending on your message arguments, memory may be allocated for boxing and varargs array
 * creation. However, the methods of this class have a large number of overloads that prevent such
 * allocations in many common cases.
 *
 * <p>The message string is not formatted unless the exception will be thrown, so the cost of the
 * string formatting itself should not be a concern.
 *

		apiErr = ErrAdminBucketQuotaExceeded
	case *event.ErrInvalidEventName:
		apiErr = ErrEventNotification
	case *event.ErrInvalidARN:
		apiErr = ErrARNNotification
	case *event.ErrARNNotFound:
		apiErr = ErrARNNotification
	case *levent.ErrInvalidARN:
		apiErr = ErrLambdaARNInvalid
	case *levent.ErrARNNotFound:
		apiErr = ErrLambdaARNNotFound
	case *event.ErrUnknownRegion:
		apiErr = ErrRegionNotification

Davor war der Umgang mit asynchronem Code jedoch deutlich komplexer und schwieriger.

In früheren Versionen von Python hätten Sie Threads oder <a href="https://www.gevent.org/" class="external-link" target="_blank">Gevent</a> verwenden können. Der Code ist jedoch viel komplexer zu verstehen, zu debuggen und nachzuvollziehen.