@Nullable
  public RunContentDescriptor getSelectedContent() {
    for (String activeWindow : myToolwindowIdZbuffer) {
      final ContentManager contentManager = myToolwindowIdToContentManagerMap.get(activeWindow);
      if (contentManager == null) {
        continue;
      }

      final Content selectedContent = contentManager.getSelectedContent();
      if (selectedContent == null) {
        if (contentManager.getContentCount() == 0) {
          // continue to the next window if the content manager is empty
          continue;
        } else {
          // stop iteration over windows because there is some content in the window and the window
          // is the last used one
          break;
        }
      }
      // here we have selected content
      return getRunContentDescriptorByContent(selectedContent);
    }

    return null;
  }
 private ContentManager getContentManagerForRunner(final Executor executor) {
   final ContentManager contentManager =
       myToolwindowIdToContentManagerMap.get(executor.getToolWindowId());
   if (contentManager == null) {
     LOG.error("Runner " + executor.getId() + " is not registered");
   }
   return contentManager;
 }
  public RunContentDescriptor[] getAllDescriptors() {
    final List<RunContentDescriptor> descriptors = new ArrayList<RunContentDescriptor>();
    final String[] ids =
        myToolwindowIdToContentManagerMap
            .keySet()
            .toArray(new String[myToolwindowIdToContentManagerMap.size()]);
    for (String id : ids) {
      final ContentManager contentManager = myToolwindowIdToContentManagerMap.get(id);
      final Content[] contents = contentManager.getContents();
      for (final Content content : contents) {
        final RunContentDescriptor descriptor = getRunContentDescriptorByContent(content);
        if (descriptor != null) {
          descriptors.add(descriptor);
        }
      }
    }

    return descriptors.toArray(new RunContentDescriptor[descriptors.size()]);
  }
  @Nullable
  public RunContentDescriptor getSelectedContent() {
    final String activeWindow =
        myToolwindowIdZbuffer.isEmpty() ? null : myToolwindowIdZbuffer.getFirst();

    if (activeWindow != null) {
      final ContentManager contentManager = myToolwindowIdToContentManagerMap.get(activeWindow);
      if (contentManager != null) {
        final Content selectedContent = contentManager.getSelectedContent();
        if (selectedContent != null) {
          final RunContentDescriptor runContentDescriptorByContent =
              getRunContentDescriptorByContent(selectedContent);
          if (runContentDescriptorByContent != null) {
            return runContentDescriptorByContent;
          }
        }
      }
    }
    return null;
  }
  @NotNull
  public List<RunContentDescriptor> getAllDescriptors() {
    if (myToolwindowIdToContentManagerMap.isEmpty()) {
      return Collections.emptyList();
    }
    final String[] ids =
        myToolwindowIdToContentManagerMap
            .keySet()
            .toArray(new String[myToolwindowIdToContentManagerMap.size()]);
    final List<RunContentDescriptor> descriptors = new ArrayList<RunContentDescriptor>();
    for (String id : ids) {
      final ContentManager contentManager = myToolwindowIdToContentManagerMap.get(id);
      for (final Content content : contentManager.getContents()) {
        final RunContentDescriptor descriptor = getRunContentDescriptorByContent(content);
        if (descriptor != null) {
          descriptors.add(descriptor);
        }
      }
    }

    return descriptors;
  }
 private void unregisterToolwindow(final String id) {
   final ContentManager manager = myToolwindowIdToContentManagerMap.get(id);
   manager.removeAllContents(true);
   myToolwindowIdToContentManagerMap.remove(id);
   myToolwindowIdZbuffer.remove(id);
 }