sshd-core/src/main/java/org/apache/sshd/common/forward/DefaultForwarderFactory.java [58:77]:
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    @Override
    public PortForwardingEventListener getPortForwardingEventListenerProxy() {
        return listenerProxy;
    }

    @Override
    public void addPortForwardingEventListener(PortForwardingEventListener listener) {
        listeners.add(PortForwardingEventListener.validateListener(listener));
    }

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

        listeners.remove(PortForwardingEventListener.validateListener(listener));
    }

    @Override
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sshd-core/src/main/java/org/apache/sshd/common/session/helpers/AbstractConnectionService.java [122:141]:
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    @Override
    public PortForwardingEventListener getPortForwardingEventListenerProxy() {
        return listenerProxy;
    }

    @Override
    public void addPortForwardingEventListener(PortForwardingEventListener listener) {
        listeners.add(PortForwardingEventListener.validateListener(listener));
    }

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

        listeners.remove(PortForwardingEventListener.validateListener(listener));
    }

    @Override
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