/**
     * @return the targetDomain
     */
    public String getTargetDomain() {
        return this.targetDomain;
    }

    /**
     * @return the targetHost
     */
    public String getTargetHost() {
        return this.targetHost;
    }

    /**
     * @return whether the session is in use
     */
    @Override
    public boolean isInUse() {
        return this.usageCount.get() > 0;