{* ../../docs_src/background_tasks/tutorial001.py hl[6:9] *}

## Add the background task { #add-the-background-task }

Inside of your *path operation function*, pass your task function to the *background tasks* object with the method `.add_task()`:

{* ../../docs_src/background_tasks/tutorial001.py hl[14] *}

`.add_task()` receives as arguments:

* A task function to be run in the background (`write_notification`).

    Preconditions.checkNotNull(task, "task must not be null!");
    return delegate.submit(task);
  }

  @Override
  public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)
      throws InterruptedException {
    Preconditions.checkNotNull(tasks, "tasks must not be null!");
    return delegate.invokeAll(tasks);
  }

  @Override
  public <T> List<Future<T>> invokeAll(

    Preconditions.checkNotNull(task, "task must not be null!");
    return delegate.submit(task);
  }

  @Override
  public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)
      throws InterruptedException {
    Preconditions.checkNotNull(tasks, "tasks must not be null!");
    return delegate.invokeAll(tasks);
  }

  @Override
  public <T> List<Future<T>> invokeAll(

   * implemented as "no-effort". No interrupts or other attempts are made to stop threads executing
   * tasks. Second, the returned list will always be empty, as any submitted task is considered to
   * have started execution. This applies also to tasks given to {@code invokeAll} or {@code
   * invokeAny} which are pending serial execution, even the subset of the tasks that have not yet

 * cancelled).
 *
 * <p>This class serializes execution of <i>submitted</i> tasks but not any <i>listeners</i> of
 * those tasks.
 *
 * <p>Submitted tasks have a happens-before order as defined in the Java Language Specification.
 * Tasks execute with the same happens-before order that the function calls to {@link #submit} and
 * {@link #submitAsync} that submitted those tasks had.
 *

   * implemented as "no-effort". No interrupts or other attempts are made to stop threads executing
   * tasks. Second, the returned list will always be empty, as any submitted task is considered to
   * have started execution. This applies also to tasks given to {@code invokeAll} or {@code
   * invokeAny} which are pending serial execution, even the subset of the tasks that have not yet

							task.event.StorageClass, task.objInfo.Bucket, task.objInfo.Name, task.objInfo.VersionID, err))
					}
				}
			} else {
				ts := tierStats{
					TotalSize:   uint64(task.objInfo.Size),
					NumVersions: 1,
				}
				if task.objInfo.IsLatest {
					ts.NumObjects = 1
				}
				t.addLastDayStats(task.event.StorageClass, ts)
			}
			t.activeTasks.Add(-1)

    operation ->> client: Return response to client
    Note over client,operation: Response is already sent, can't change it anymore
    opt Tasks
        operation -->> tasks: Send background tasks
    end
    opt Raise other exception
        tasks -->> tasks: Handle exceptions in the background task code
    end
```

/// info

import org.gradle.api.artifacts.VersionCatalogsExtension
import org.gradle.api.plugins.ExtensionAware
import org.gradle.api.plugins.JavaPluginExtension
import org.gradle.api.tasks.SourceSet
import org.gradle.api.tasks.SourceSetContainer
import org.gradle.api.tasks.bundling.Jar
import org.gradle.kotlin.dsl.dependencies
import org.gradle.kotlin.dsl.findByType
import org.gradle.kotlin.dsl.get
import org.gradle.kotlin.dsl.getByName

    ignore("okhttp3/osgi/workspace/cnf/repo/index.xml.gz.sha")
  }
}

// Expose OSGi jars to the test environment.
val osgiTestDeploy: Configuration by configurations.creating

val test = tasks.named("test")
val copyOsgiTestDeployment = tasks.register<Copy>("copyOsgiTestDeployment") {
  from(osgiTestDeploy)
  into(layout.buildDirectory.dir("resources/test/okhttp3/osgi/deployments"))
}

test.configure {