* Sets the message list for this session.
     *
     * @param messages the messages to set
     */
    public void setMessages(final List<ChatMessage> messages) {
        synchronized (messagesLock) {
            if (messages == null) {
                this.messages = null;
            } else if (messages instanceof CopyOnWriteArrayList) {
                this.messages = messages;
            } else {

     * Gets the messages in this request.
     *
     * @return the list of messages
     */
    public List<LlmMessage> getMessages() {
        return messages;
    }

    /**
     * Sets the messages in this request.
     *
     * @param messages the list of messages
     */
    public void setMessages(final List<LlmMessage> messages) {
        this.messages = messages;
    }

    /**
     * Gets the model name.

        messages.add(LlmMessage.user("Message 1"));
        messages.add(LlmMessage.assistant("Message 2"));

        request.setMessages(messages);

        assertSame(messages, request.getMessages());
        assertEquals(2, request.getMessages().size());
    }

    @Test
    public void test_setModel() {
        final LlmChatRequest request = new LlmChatRequest();