Struct SharedState 

pub struct SharedState { /* private fields */ }

Core traits and types.

Always available regardless of feature flags. Includes:

• Agent - The fundamental trait for all agents
• Tool / Toolset - For extending agents with capabilities
• Session / State - For managing conversation context
• Event - For streaming agent responses
• AdkError / Result - Unified error handling Thread-safe key-value store for parallel agent coordination.

Scoped to a single ParallelAgent::run() invocation. All sub-agents share the same Arc<SharedState> instance.

Example

use adk_core::SharedState;
use std::sync::Arc;
use std::time::Duration;

let state = Arc::new(SharedState::new());

// Agent A publishes a workbook handle
state.set_shared("workbook_id", serde_json::json!("wb-123")).await?;

// Agent B waits for the handle
let handle = state.wait_for_key("workbook_id", Duration::from_secs(30)).await?;

Implementations

impl SharedState

pub fn new() -> SharedState

Creates a new empty SharedState.

pub async fn set_shared( &self, key: impl Into<String>, value: Value, ) -> Result<(), SharedStateError>

Inserts a key-value pair. Notifies all waiters on that key.

Errors

Returns SharedStateError::EmptyKey if key is empty. Returns SharedStateError::KeyTooLong if key exceeds 256 bytes.

pub async fn get_shared(&self, key: &str) -> Option<Value>

Returns the value for a key, or None if not present.

pub async fn wait_for_key( &self, key: &str, timeout: Duration, ) -> Result<Value, SharedStateError>

Blocks until the key appears, or the timeout expires.

If the key already exists, returns immediately.

Errors

Returns SharedStateError::Timeout if the timeout expires. Returns SharedStateError::InvalidTimeout if timeout is outside [1ms, 300s].

pub async fn snapshot(&self) -> HashMap<String, Value>

Returns a snapshot of all current entries.

Trait Implementations

impl Debug for SharedState

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

Formats the value using the given formatter.

impl Default for SharedState

fn default() -> SharedState

Returns the “default value” for a type.

impl Serialize for SharedState

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.