public boolean retainAll(Collection<?> c) {
      synchronized (mutex) {
        return delegate().retainAll(c);
      }
    }

    @Override
    public int size() {
      synchronized (mutex) {
        return delegate().size();
      }
    }

    @Override
    public @Nullable Object[] toArray() {
      synchronized (mutex) {
        return delegate().toArray();
      }
    }

    public boolean removeIf(Predicate<? super E> filter) {
      synchronized (mutex) {
        return delegate().removeIf(filter);
      }
    }

    @Override
    public int size() {
      synchronized (mutex) {
        return delegate().size();
      }
    }

    @Override
    public @Nullable Object[] toArray() {
      synchronized (mutex) {
        return delegate().toArray();
      }
    }

{* ../../docs_src/advanced_middleware/tutorial003.py hl[2,6] *}

The following arguments are supported:

* `minimum_size` - Do not GZip responses that are smaller than this minimum size in bytes. Defaults to `500`.

    // GET /api/admin/backup/files
    @Execute
    public JsonResponse<ApiResult> files() {
        final List<Map<String, String>> list = getBackupItems();
        return asJson(new ApiBackupFilesResponse().files(list).total(list.size()).status(ApiResult.Status.OK).result());
    }

    // GET /api/admin/backup/file/{id}
    @Execute
    public StreamResponse get$file(final String id) {

    }

    TestSuite suite = new TestSuite(name);
    for (Feature<?> collectionSize : sizesToTest) {
      String oneSizeName =
          Platform.format(
              "%s [collection size: %s]", name, collectionSize.toString().toLowerCase());
      OneSizeGenerator<T, E> oneSizeGenerator =
          new OneSizeGenerator<>(getSubjectGenerator(), (CollectionSize) collectionSize);

            while ( it.hasNext() ) {
                try ( SmbResource n = it.next() ) {
                    list.add(n.getName());
                }
            }
            return list.toArray(new String[list.size()]);
        }
        catch ( CIFSException e ) {
            throw SmbException.wrap(e);
        }
    }

   * the given character set. Malformed input and unmappable characters will be replaced.
   *
   * @param reader input source
   * @param charset character set used for encoding chars to bytes
   * @param bufferSize size of internal input and output buffers
   * @throws IllegalArgumentException if bufferSize is non-positive
   */
  ReaderInputStream(Reader reader, Charset charset, int bufferSize) {
    this(
        reader,
        charset

                        }
                      };
                    }
                  };
                }

                @Override
                public int size() {
                  return map.size();
                }

                @Override
                public boolean remove(Object o) {
                  return map.entrySet().remove(o);
                }

   * the given character set. Malformed input and unmappable characters will be replaced.
   *
   * @param reader input source
   * @param charset character set used for encoding chars to bytes
   * @param bufferSize size of internal input and output buffers
   * @throws IllegalArgumentException if bufferSize is non-positive
   */
  ReaderInputStream(Reader reader, Charset charset, int bufferSize) {
    this(
        reader,
        charset

        if (MAX_QUERY_TERM_NUM < keywords.size()) {
            return new String[0];
        }
        for (final String k : keywords) {
            if (MAX_QUERY_TERM_LENGTH < k.length()) {
                return new String[0];
            }
        }
        return keywords.toArray(new String[keywords.size()]);
    }