long nanos = expirationNanos;
      long now = System.nanoTime();
      if (nanos == 0 || now - nanos >= 0) {
        synchronized (lock) {
          if (nanos == expirationNanos) { // recheck for lost race
            T t = delegate.get();
            value = t;
            nanos = now + durationNanos;
            // In the very unlikely event that nanos is 0, set it to 1;

      long nanos = expirationNanos;
      long now = System.nanoTime();
      if (nanos == 0 || now - nanos >= 0) {
        synchronized (lock) {
          if (nanos == expirationNanos) { // recheck for lost race
            T t = delegate.get();
            value = t;
            nanos = now + durationNanos;
            // In the very unlikely event that nanos is 0, set it to 1;

Conversations in the chat systems are also not as easily searchable as in GitHub, so questions and answers might get lost in the conversation. And only the ones in GitHub count to become a [FastAPI Expert](fastapi-people.md#fastapi-experts){.internal-link target=_blank}, so you will most probably receive more attention in GitHub.

### Den Code überprüfen

* Prüfen und lesen Sie den Code, fragen Sie sich, ob er Sinn macht, **führen Sie ihn lokal aus** und testen Sie, ob er das Problem tatsächlich löst.

* Schreiben Sie dann einen **Kommentar** und berichten, dass Sie das getan haben. So weiß ich, dass Sie ihn wirklich überprüft haben.

/// info

These headers preserve information about the original request that would otherwise be lost:

* **X-Forwarded-For**: The original client's IP address
* **X-Forwarded-Proto**: The original protocol (`https`)
* **X-Forwarded-Host**: The original host (`mysuperapp.com`)

   *
   * We get plan0 and plan1 from the route planner.
   * We get plan2 as a follow-up to plan1, typically retry the same IP but different TLS.
   * We get plan3 as a retry of plan0, which was canceled when it lost the race.
   *
   * This test confirms that we prefer to do the TLS follow-up (plan2) before the TCP retry (plan3).
   * It also confirms we enforce the 250 ms delay in each race.
   */
  @Test

  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(

## Running on Startup { #running-on-startup }

In most cases, when you create a web API, you want it to be **always running**, uninterrupted, so that your clients can always access it. This is of course, unless you have a specific reason why you want it to run only in certain situations, but most of the time you want it constantly running and **available**.

### In a Remote Server { #in-a-remote-server }

```java
package jcifs.internal.witness;

import java.util.List;
import java.util.ArrayList;

public class WitnessNotification {
    private final WitnessEventType eventType;
    private final long timestamp;
    private final String resourceName;
    private final List<WitnessIPAddress> newIPAddresses;
    private final List<WitnessIPAddress> oldIPAddresses;
    private final String clientAccessPoint;

      LocalCache<Object, Object> map = makeLocalCache(builder.concurrencyLevel(1));
      Segment<Object, Object> segment = map.segments[0];
      List<ReferenceEntry<Object, Object>> writeOrder = new LinkedList<>();
      List<ReferenceEntry<Object, Object>> readOrder = new LinkedList<>();
      for (int i = 0; i < SMALL_MAX_SIZE; i++) {
        Object key = new Object();
        int hash = map.hash(key);