Struct ChatHistory 

pub struct ChatHistory { /* private fields */ }

Container for managing chat history with serialization support.

Provides automatic message limit management and convenient methods for adding and retrieving messages.

Examples

use graph_flow::ChatHistory;

let mut history = ChatHistory::new();
history.add_user_message("Hello".to_string());
history.add_assistant_message("Hi there!".to_string());

assert_eq!(history.len(), 2);
assert!(!history.is_empty());

Implementations

impl ChatHistory

pub fn new() -> Self

Create a new empty chat history with a default limit of 1000 messages.

pub fn with_max_messages(max: usize) -> Self

Create a new chat history with a maximum message limit.

When the limit is exceeded, older messages are automatically removed.

Examples

use graph_flow::ChatHistory;

let mut history = ChatHistory::with_max_messages(10);

// Add 15 messages
for i in 0..15 {
    history.add_user_message(format!("Message {}", i));
}

// Only the last 10 are kept
assert_eq!(history.len(), 10);

pub fn add_user_message(&mut self, content: String)

Add a user message to the chat history.

pub fn add_assistant_message(&mut self, content: String)

Add an assistant message to the chat history.

pub fn add_system_message(&mut self, content: String)

Add a system message to the chat history.

pub fn clear(&mut self)

Clear all messages from the chat history.

pub fn len(&self) -> usize

Get the number of messages in the chat history.

pub fn is_empty(&self) -> bool

Check if the chat history is empty.

pub fn messages(&self) -> &[SerializableMessage]

Get a reference to all messages.

pub fn last_messages(&self, n: usize) -> &[SerializableMessage]

Get the last N messages.

If N is greater than the total number of messages, all messages are returned.

Examples

use graph_flow::ChatHistory;

let mut history = ChatHistory::new();
history.add_user_message("Message 1".to_string());
history.add_user_message("Message 2".to_string());
history.add_user_message("Message 3".to_string());

let last_two = history.last_messages(2);
assert_eq!(last_two.len(), 2);
assert_eq!(last_two[0].content, "Message 2");
assert_eq!(last_two[1].content, "Message 3");

Trait Implementations

impl Clone for ChatHistory

fn clone(&self) -> ChatHistory

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ChatHistory

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ChatHistory

fn default() -> ChatHistory

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ChatHistory

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ChatHistory

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.