long now = System.currentTimeMillis();
        for (ResourceHolder holder : activeResources.values()) {
            if (!holder.closed && holder.getAge() > maxResourceAge) {
                reportPotentialLeak(holder);
            }
        }
    }

    /**
     * Perform automatic cleanup of abandoned resources
     */
    public void performCleanup() {
        if (!autoCleanupEnabled) {