sshd-core/src/main/java/org/apache/sshd/common/session/helpers/AbstractSession.java [2487:2504]:
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    public void addPortForwardingEventListener(PortForwardingEventListener listener) {
        PortForwardingEventListener.validateListener(listener);
        // avoid race conditions on notifications while session is being closed
        if (!isOpen()) {
            log.warn("addPortForwardingEventListener({})[{}] ignore registration while session is closing", this, listener);
            return;
        }

        if (this.tunnelListeners.add(listener)) {
            if (log.isTraceEnabled()) {
                log.trace("addPortForwardingEventListener({})[{}] registered", this, listener);
            }
        } else {
            if (log.isTraceEnabled()) {
                log.trace("addPortForwardingEventListener({})[{}] ignored duplicate", this, listener);
            }
        }
    }
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sshd-core/src/main/java/org/apache/sshd/common/helpers/AbstractFactoryManager.java [436:454]:
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    public void addPortForwardingEventListener(PortForwardingEventListener listener) {
        PortForwardingEventListener.validateListener(listener);

        // avoid race conditions on notifications while session is being closed
        if (!isOpen()) {
            log.warn("addPortForwardingEventListener({})[{}] ignore registration while session is closing", this, listener);
            return;
        }

        if (this.tunnelListeners.add(listener)) {
            if (log.isTraceEnabled()) {
                log.trace("addPortForwardingEventListener({})[{}] registered", this, listener);
            }
        } else {
            if (log.isTraceEnabled()) {
                log.trace("addPortForwardingEventListener({})[{}] ignored duplicate", this, listener);
            }
        }
    }
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