docs: private void invalidateAllMemorySessions() {
  
          if (com.ibm.ejs.ras.TraceComponent.isAnyTracingEnabled() && LoggingUtil.SESSION_LOGGER_CORE.isLoggable(Level.FINE)) {
              LoggingUtil.SESSION_LOGGER_CORE.entering(methodClassName, methodNames[INVALIDATE_ALL_MEMORY_SESSIONS], appNameForLogging);
          }
  
          Set s = _sessions.keySet();
          if (s != null) {
              for (Iterator it = s.iterator(); it.hasNext();) {
                  MemorySession ms = (MemorySession) _sessions.get(it.next());
                  ms.internalInvalidate(false);
              }
          }
          if (com.ibm.ejs.ras.TraceComponent.isAnyTracingEnabled() && LoggingUtil.SESSION_LOGGER_CORE.isLoggable(Level.FINE)) {
              LoggingUtil.SESSION_LOGGER_CORE.exiting(methodClassName, methodNames[INVALIDATE_ALL_MEMORY_SESSIONS]);
          }
      }