code: void onResourceReleaseRequest(final ResourceReleaseEvent releaseRequest) {
      synchronized (this.theContainers) {
        LOG.log(Level.FINEST, "Release container: {0}", releaseRequest.getIdentifier());
        this.theContainers.release(releaseRequest.getIdentifier());
        this.checkRequestQueue();
      }
    }
docs: Receives and processes a resource release request.
  
  @param releaseRequest the release request to be processed