sshd-core/src/main/java/org/apache/sshd/common/helpers/AbstractFactoryManager.java [342:360]:
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    public void addSessionListener(SessionListener listener) {
        SessionListener.validateListener(listener);

        // avoid race conditions on notifications while manager is being closed
        if (!isOpen()) {
            log.warn("addSessionListener({})[{}] ignore registration while manager is closing", this, listener);
            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);
            }
        }
    }
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sshd-core/src/main/java/org/apache/sshd/common/session/helpers/AbstractSession.java [2223:2240]:
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    public void addSessionListener(SessionListener listener) {
        SessionListener.validateListener(listener);
        // avoid race conditions on notifications while session is being closed
        if (!isOpen()) {
            log.warn("addSessionListener({})[{}] ignore registration while session is closing", this, listener);
            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);
            }
        }
    }
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