## Create a task function { #create-a-task-function }

Create a function to be run as the background task.

It is just a standard function that can receive parameters.

It can be an `async def` or normal `def` function, **FastAPI** will know how to handle it correctly.

In this case, the task function will write to a file (simulating sending an email).

            final TimeoutTask task = e.getElement();
            if (task.isCanceled()) {
                e.remove();
            } else if (!task.isStopped() && task.isExpired()) {
                expiredTask.add(task);
                if (!task.isPermanent()) {
                    e.remove();
                }
            }
        }

            AbstractService service, ScheduledExecutorService executor, Runnable task) {
          return new FutureAsCancellable(
              executor.scheduleWithFixedDelay(task, initialDelay, delay, unit));
        }
      };
    }

    /**
     * Returns a {@link Scheduler} that schedules the task using the {@link
     * ScheduledExecutorService#scheduleAtFixedRate} method.
     *

    protected CommonPoolUtil() {
        // nothing
    }

    /**
     * Executes the given task in the common ForkJoinPool.
     *
     * @param task
     *            the task to execute
     */
    public static void execute(final Runnable task) {
        ForkJoinPool.commonPool().execute(() -> {
            final Thread currentThread = Thread.currentThread();

       *   user task -- which means that we already got past this code (or else we exited early
       *   above))
       */
      // Unconditionally set; there is no risk of throwing away a queued task from another thread,
      // because in order for the current task to run on this executor the previous task must have
      // already started execution. Because each task on a TaskNonReentrantExecutor can only produce

            }
        }
        """
        when:
        def result = gradleRunner("copyArchive").build()

        then: "tar task executed and target folder contains plain tar"
        result.task(':buildProducerTar').outcome == TaskOutcome.SUCCESS
        result.task(':consumer:copyArchive').outcome == TaskOutcome.SUCCESS
        file("producer-tar/build/distributions/elasticsearch.tar.gz").exists()

    // Wait for the first task to be started in the background. It will block until we explicitly
    // stop it.
    blockingCallable.waitForStart();

    // Give the second task a chance to (incorrectly) start up while the first task is running.
    assertThat(future2.isDone()).isFalse();

    // Stop the first task. The second task should then run.
    blockingCallable.stop();

            task.setDescription("Runs rest tests against an elasticsearch cluster.");
            task.setGroup(JavaBasePlugin.VERIFICATION_GROUP);
            task.mustRunAfter(project.getTasks().named("precommit"));
        });
        project.getTasks().named("check").configure(task -> task.dependsOn(integTest));
    }

            task.setGroup("documentation");
            task.setDescription("Generate Javadocs for all API classes");

            // TODO: This breaks if version is changed later
            task.setTitle("Gradle API " + project.getVersion());

            StandardJavadocDocletOptions options = (StandardJavadocDocletOptions) task.getOptions();
            options.setEncoding("utf-8");

        }
        """

        when:
        def result = gradleRunner("yamlRestTest").build()

        then:
        result.task(':yamlRestTest').outcome == TaskOutcome.NO_SOURCE
        result.task(':copyYamlTestsTask').outcome == TaskOutcome.NO_SOURCE
        result.task(':copyRestApiSpecsTask').outcome == TaskOutcome.NO_SOURCE
    }

    def "yamlRestTest executes and copies api and tests to correct source set"() {