How to use

getChildren

method

in

org.apache.brooklyn.api.mgmt.HasTaskChildren

/** return all children tasks of the given tasks, if it has children, else empty list */
public static Iterable<Task<?>> children(Task<?> task) {
  if (task instanceof HasTaskChildren)
    return ((HasTaskChildren)task).getChildren();
  return Collections.emptyList();
}

private List<TaskSummary> getSubTaskChildren(Task<?> t) {
  if (!(t instanceof HasTaskChildren)) {
    return Collections.emptyList();
  }
  return new LinkedList<TaskSummary>(Collections2.transform(Lists.newArrayList(((HasTaskChildren) t).getChildren()),
      TaskTransformer.fromTask(ui.getBaseUriBuilder())));
}

  public static void dumpInfo(Task<?> t, Writer out, String currentIndentation, String tab) throws IOException {
    out.append(currentIndentation+t+": "+t.getStatusDetail(false)+"\n");

    if (t instanceof HasTaskChildren) {
      for (Task<?> child: ((HasTaskChildren)t).getChildren()) {
        dumpInfo(child, out, currentIndentation+tab, tab);
      }
    }
    out.flush();
  }
}

public void deleteTask(Task<?> task) {
  boolean removed = deleteTaskNonRecursive(task);
  if (!removed) return;
  
  if (task instanceof HasTaskChildren) {
    List<Task<?>> children = ImmutableList.copyOf(((HasTaskChildren)task).getChildren());
    for (Task<?> child : children) {
      deleteTask(child);
    }
  }
}

private LinkedHashMap<String, TaskSummary> getAllDescendantTasks(final Task<?> parentTask, int limit, int maxDepth) {
  final LinkedHashMap<String, TaskSummary> result = Maps.newLinkedHashMap();
  if (!(parentTask instanceof HasTaskChildren)) {
    return result;
  }
  Set<Task<?>> nextLayer = MutableSet.copyOf( ((HasTaskChildren) parentTask).getChildren() );
  outer: while (limit!=0 && !nextLayer.isEmpty() && maxDepth-- != 0) {
    Set<Task<?>> thisLayer = nextLayer;
    nextLayer = MutableSet.of();
    for (final Task<?> childTask : thisLayer) {
      TaskSummary wasThere = result.put(childTask.getId(), TaskTransformer.fromTask(ui.getBaseUriBuilder()).apply(childTask));
      if (wasThere==null) {
        if (--limit == 0) {
          break outer;
        }
        if (childTask instanceof HasTaskChildren) {
          Iterables.addAll(nextLayer, ((HasTaskChildren)childTask).getChildren());
        }
      }
    }
  }
  return result;
}

protected Optional<Task<?>> findTaskOrSubTaskImpl(Iterable<? extends Task<?>> tasks, Predicate<? super Task<?>> matcher, List<String> taskNames) {
  for (Task<?> task : tasks) {
    if (matcher.apply(task)) return Optional.<Task<?>>of(task);
    if (task instanceof HasTaskChildren) {
      Optional<Task<?>> subResult = findTaskOrSubTask(((HasTaskChildren) task).getChildren(), matcher);
      if (subResult.isPresent()) return subResult;
    }
  }
  return Optional.<Task<?>>absent();
}

public static Optional<Task<?>> findTaskOrSubTaskImpl(Iterable<? extends Task<?>> tasks, Predicate<? super Task<?>> matcher, List<String> taskNames) {
  for (Task<?> task : tasks) {
    if (matcher.apply(task)) return Optional.<Task<?>>of(task);
    if (task instanceof HasTaskChildren) {
      Optional<Task<?>> subResult = findTaskOrSubTask(((HasTaskChildren) task).getChildren(), matcher);
      if (subResult.isPresent()) return subResult;
    }
  }
  return Optional.<Task<?>>absent();
}

  protected Optional<Task<?>> findTaskOrSubTaskImpl(Iterable<? extends Task<?>> tasks, Predicate<? super Task<?>> matcher) {
    for (Task<?> task : tasks) {
      if (matcher.apply(task)) return Optional.<Task<?>>of(task);

      if (!(task instanceof HasTaskChildren)) {
        return Optional.absent();
      } else {
        Optional<Task<?>> subResult = findTaskOrSubTask(((HasTaskChildren) task).getChildren(), matcher);
        if (subResult.isPresent()) return subResult;
      }
    }

    return Optional.<Task<?>>absent();
  }
}

private void assertTaskHasFailedChild(Task<Void> task) {
  Assert.assertTrue(Tasks.failed( ((HasTaskChildren)task).getChildren() ).iterator().hasNext());
}
  

/** the composed effector should allow us to inspect its children */
@Test
public void testComposedEffector() throws Exception {
  Entity txp1 = app.createAndManageChild(EntitySpec.create(Entity.class, Txp1Entity.class));
  
  Task<Integer> e = txp1.invoke(TWO_X_PLUS_ONE, MutableMap.of("numberToStartWith", 3));
  Assert.assertTrue(e instanceof DynamicSequentialTask);
  Assert.assertEquals(e.get(), (Integer)7);
  Assert.assertEquals( Iterables.size( ((HasTaskChildren)e).getChildren() ), 1);
  Task<?> child = ((HasTaskChildren)e).getChildren().iterator().next();
  Assert.assertEquals( Iterables.size( ((HasTaskChildren)child).getChildren() ), 1);
}

@Override
public List<TaskSummary> listTasks(String applicationId, String entityId, int limit, Boolean recurse) {
  int sizeRemaining = limit;
  Entity entity = brooklyn().getEntity(applicationId, entityId);
  List<Task<?>> tasksToScan = MutableList.copyOf(BrooklynTaskTags.getTasksInEntityContext(mgmt().getExecutionManager(), entity));
  if (limit>0) {
    tasksToScan = MutableList.copyOf(Ordering.from(new InterestingTasksFirstComparator(entity)).leastOf(tasksToScan, limit));
  }
  Map<String,Task<?>> tasksLoaded = MutableMap.of();
  
  while (!tasksToScan.isEmpty()) {
    Task<?> t = tasksToScan.remove(0);
    if (tasksLoaded.put(t.getId(), t)==null) {
      if (--sizeRemaining==0) {
        break;
      }
      if (Boolean.TRUE.equals(recurse)) {
        if (t instanceof HasTaskChildren) {
          Iterables.addAll(tasksToScan, ((HasTaskChildren) t).getChildren() );
        }
      }
    }
  }
  return new LinkedList<TaskSummary>(Collections2.transform(tasksLoaded.values(), 
    TaskTransformer.fromTask(ui.getBaseUriBuilder())));
}

/** the composed effector should allow us to inspect its children */
@Test
public void testComposedEffectorBasic() throws Exception {
  Entity txp1 = app.createAndManageChild(EntitySpec.create(Entity.class, Txp1Entity.class));
  
  Task<Integer> e = txp1.invoke(TWO_X_PLUS_ONE_BASIC, MutableMap.of("numberToStartWith", 3));
  Assert.assertTrue(e instanceof DynamicSequentialTask);
  Assert.assertEquals(e.get(), (Integer)7);
  Assert.assertEquals( Iterables.size( ((HasTaskChildren)e).getChildren() ), 2);
}

if (parent instanceof HasTaskChildren && Iterables.contains(((HasTaskChildren)parent).getChildren(), task)) {

MutableList<Task<?>> childrenReversed = MutableList.copyOf( ((HasTaskChildren)task).getChildren() );
Collections.reverse(childrenReversed);

private void checkTags(Task<Integer> t, Entity entity, Effector<?> eff, boolean shouldHaveChild) {
  Assert.assertEquals(BrooklynTaskTags.getContextEntity(t), app);
  Assert.assertTrue(t.getTags().contains(BrooklynTaskTags.EFFECTOR_TAG), "missing effector tag; had: "+t.getTags());
  Assert.assertTrue(t.getDescription().contains(eff.getName()), "description missing effector name: "+t.getDescription());
  Assert.assertTrue(BrooklynTaskTags.isInEffectorTask(t, entity, eff, false));
  Assert.assertTrue(BrooklynTaskTags.isInEffectorTask(t, null, null, false));
  Assert.assertFalse(BrooklynTaskTags.isInEffectorTask(t, entity, Startable.START, false));
  
  if (shouldHaveChild) {
    Task<?> subtask = ((HasTaskChildren)t).getChildren().iterator().next();
    Assert.assertTrue(BrooklynTaskTags.isInEffectorTask(subtask, entity, eff, false));
    Assert.assertTrue(BrooklynTaskTags.isInEffectorTask(subtask, null, null, false));
  }
}

Iterable<Task<?>> childrenTasks = ((HasTaskChildren)this).getChildren();
if (childrenTasks.iterator().hasNext()) {
  rv += "Children:\n";

log.info("testCancelled acquired semaphore; permits left is "+cancellations.availablePermits());
Iterator<Task<?>> ci = ((HasTaskChildren)t).getChildren().iterator();

final Task<T> t = (Task<T>)task;
if (!Tasks.isQueuedOrSubmitted(t) && (!(Tasks.current() instanceof HasTaskChildren) || 
    !Iterables.contains( ((HasTaskChildren)Tasks.current()).getChildren(), t ))) {

if (task instanceof HasTaskChildren) {
  children = new ArrayList<LinkWithMetadata>();
  for (Task<?> t: ((HasTaskChildren)task).getChildren()) {
    children.add(asLink(t, ub));