@Test
public void testInMemoryFileHandledGracefully() {
  createBuildFile(new WorkspacePath("java/com/google/BUILD"), "glob(['**/*.java'])");

  LightVirtualFile inMemoryFile =
      new LightVirtualFile("mockProjectViewFile", ProjectViewLanguage.INSTANCE, "");

  FileManager fileManager =
      ((PsiManagerEx) PsiManager.getInstance(getProject())).getFileManager();
  fileManager.setViewProvider(
      inMemoryFile, fileManager.createFileViewProvider(inMemoryFile, true));

  PsiFile psiFile = fileManager.findFile(inMemoryFile);

  FindUsages.findAllReferences(psiFile);
}
 

@Override
@Nullable
public final PsiFile getPsi(@Nonnull Language target) {
  if (!isPhysical()) {
    FileManager fileManager = getManager().getFileManager();
    VirtualFile virtualFile = getVirtualFile();
    if (fileManager.findCachedViewProvider(virtualFile) == null && getCachedPsiFiles().isEmpty()) {
      fileManager.setViewProvider(virtualFile, this);
    }
  }
  return getPsiInner(target);
}
 

void handleCommitWithoutPsi(@Nonnull Document document) {
  final UncommittedInfo prevInfo = clearUncommittedInfo(document);
  if (prevInfo == null) {
    return;
  }

  myUncommittedDocuments.remove(document);

  if (!myProject.isInitialized() || myProject.isDisposed() || myProject.isDefault()) {
    return;
  }

  VirtualFile virtualFile = FileDocumentManager.getInstance().getFile(document);
  if (virtualFile != null) {
    FileManager fileManager = getFileManager();
    FileViewProvider viewProvider = fileManager.findCachedViewProvider(virtualFile);
    if (viewProvider != null) {
      // we can end up outside write action here if the document has forUseInNonAWTThread=true
      ApplicationManager.getApplication().runWriteAction((ExternalChangeAction)() -> ((AbstractFileViewProvider)viewProvider).onContentReload());
    }
    else if (FileIndexFacade.getInstance(myProject).isInContent(virtualFile)) {
      ApplicationManager.getApplication().runWriteAction((ExternalChangeAction)() -> ((FileManagerImpl)fileManager).firePropertyChangedForUnloadedPsi());
    }
  }

  runAfterCommitActions(document);
}
 

@Override
@Nonnull
public FileManager getFileManager() {
  if (myMockFileManager == null) {
    myMockFileManager = new MockFileManager(this);
  }
  return myMockFileManager;
}
 

@Nonnull
private FileManager getFileManager() {
  return ((PsiManagerEx)myPsiManager).getFileManager();
}
 

@Nonnull
public abstract FileManager getFileManager();
 

@Override
@Nonnull
public FileManager getFileManager() {
  return myFileManager;
}