@Override
            public void connectionClosed(SessionProtocol protocol, InetSocketAddress remoteAddr,
                                         InetSocketAddress localAddr, AttributeMap attrs) throws Exception {
                try {
                    ConnectionPoolListener.this.connectionClosed(protocol, remoteAddr, localAddr, attrs);
                } finally {
                    nextConnectionPoolListener.connectionClosed(protocol, remoteAddr,localAddr,attrs);
                }
            }
Returns a new {@link ConnectionPoolListener} which combines two {@link ConnectionPoolListener}s.
core/src/main/java/com/linecorp/armeria/client/ConnectionPoolListener.java