docs: void release(final Channel channel) {
          if (this.executor.inEventLoop()) {
              this.releaseWithinEventExecutor(channel);
          } else {
              this.executor.submit(new Runnable() {
                  @Override
                  public void run() {
                      ApnsChannelPool.this.releaseWithinEventExecutor(channel);
                  }
              });
          }
      }