sshd-core/src/main/java/org/apache/sshd/common/helpers/AbstractFactoryManager.java [348:469]:
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            return;
        }

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

    @Override
    public void removeSessionListener(SessionListener listener) {
        if (listener == null) {
            return;
        }

        SessionListener.validateListener(listener);

        if (this.sessionListeners.remove(listener)) {
            if (log.isTraceEnabled()) {
                log.trace("removeSessionListener({})[{}] removed", this, listener);
            }
        } else {
            if (log.isTraceEnabled()) {
                log.trace("removeSessionListener({})[{}] not registered", this, listener);
            }
        }
    }

    @Override
    public SessionListener getSessionListenerProxy() {
        return sessionListenerProxy;
    }

    @Override
    public void addChannelListener(ChannelListener listener) {
        ChannelListener.validateListener(listener);

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

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

    @Override
    public void removeChannelListener(ChannelListener listener) {
        if (listener == null) {
            return;
        }

        ChannelListener.validateListener(listener);
        if (this.channelListeners.remove(listener)) {
            if (log.isTraceEnabled()) {
                log.trace("removeChannelListener({})[{}] removed", this, listener);
            }
        } else {
            if (log.isTraceEnabled()) {
                log.trace("removeChannelListener({})[{}] not registered", this, listener);
            }
        }
    }

    @Override
    public ChannelListener getChannelListenerProxy() {
        return channelListenerProxy;
    }

    @Override
    public PortForwardingEventListener getPortForwardingEventListenerProxy() {
        return tunnelListenerProxy;
    }

    @Override
    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);
            }
        }
    }

    @Override
    public void removePortForwardingEventListener(PortForwardingEventListener listener) {
        if (listener == null) {
            return;
        }

        PortForwardingEventListener.validateListener(listener);
        if (this.tunnelListeners.remove(listener)) {
            if (log.isTraceEnabled()) {
                log.trace("removePortForwardingEventListener({})[{}] removed", this, listener);
            }
        } else {
            if (log.isTraceEnabled()) {
                log.trace("removePortForwardingEventListener({})[{}] not registered", this, listener);
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sshd-core/src/main/java/org/apache/sshd/common/session/helpers/AbstractSession.java [2228:2346]:
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            return;
        }

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

    @Override
    public void removeSessionListener(SessionListener listener) {
        if (listener == null) {
            return;
        }

        SessionListener.validateListener(listener);
        if (this.sessionListeners.remove(listener)) {
            if (log.isTraceEnabled()) {
                log.trace("removeSessionListener({})[{}] removed", this, listener);
            }
        } else {
            if (log.isTraceEnabled()) {
                log.trace("removeSessionListener({})[{}] not registered", this, listener);
            }
        }
    }

    @Override
    public SessionListener getSessionListenerProxy() {
        return sessionListenerProxy;
    }

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

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

    @Override
    public void removeChannelListener(ChannelListener listener) {
        if (listener == null) {
            return;
        }

        ChannelListener.validateListener(listener);
        if (this.channelListeners.remove(listener)) {
            if (log.isTraceEnabled()) {
                log.trace("removeChannelListener({})[{}] removed", this, listener);
            }
        } else {
            if (log.isTraceEnabled()) {
                log.trace("removeChannelListener({})[{}] not registered", this, listener);
            }
        }
    }

    @Override
    public ChannelListener getChannelListenerProxy() {
        return channelListenerProxy;
    }

    @Override
    public PortForwardingEventListener getPortForwardingEventListenerProxy() {
        return tunnelListenerProxy;
    }

    @Override
    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);
            }
        }
    }

    @Override
    public void removePortForwardingEventListener(PortForwardingEventListener listener) {
        if (listener == null) {
            return;
        }

        PortForwardingEventListener.validateListener(listener);
        if (this.tunnelListeners.remove(listener)) {
            if (log.isTraceEnabled()) {
                log.trace("removePortForwardingEventListener({})[{}] removed", this, listener);
            }
        } else {
            if (log.isTraceEnabled()) {
                log.trace("removePortForwardingEventListener({})[{}] not registered", this, listener);
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