public void setEncrypted(boolean encrypted) {
        isEncrypted = encrypted;
    }
Flag that specifies if the connection should be considered closed. Closing a NIO connection
is an asynchronous operation so instead of waiting for the connection to be actually closed just
keep this flag to avoid using the connection between #close was used and the socket is actually
closed.
xmppserver/src/main/java/org/jivesoftware/openfire/nio/NettyConnection.java