code: static void releaseContext(SeaGlassContext context) {
          synchronized (contextMap) {
              List instances = (List) contextMap.get(context.getClass());
  
              if (instances == null) {
                  instances = new ArrayList(5);
                  contextMap.put(context.getClass(), instances);
              }
  
              instances.add(context);
          }
      }
docs: Release a context for re-use.
  
  @param context the context to release.