Struct Context 

pub struct Context { /* private fields */ }

A type-safe container for request-scoped data.

Context allows you to pass metadata through policy execution without modifying function signatures.

Examples

use do_over::context::{Context, ContextKey};

static CORRELATION_ID: ContextKey<String> = ContextKey::new("correlation_id");
static RETRY_COUNT: ContextKey<u32> = ContextKey::new("retry_count");

let mut ctx = Context::new();
ctx.insert(&CORRELATION_ID, "abc-123".to_string());
ctx.insert(&RETRY_COUNT, 0u32);

assert_eq!(ctx.get(&CORRELATION_ID), Some(&"abc-123".to_string()));
assert_eq!(ctx.get(&RETRY_COUNT), Some(&0u32));

Implementations

impl Context

pub fn new() -> Self

Create a new empty context.

pub fn insert<T: Send + Sync + 'static>( &mut self, key: &ContextKey<T>, value: T, )

Insert a value into the context.

Arguments

• key - The context key
• value - The value to store

Examples

use do_over::context::{Context, ContextKey};

static KEY: ContextKey<String> = ContextKey::new("key");

let mut ctx = Context::new();
ctx.insert(&KEY, "value".to_string());

pub fn get<T: Send + Sync + 'static>(&self, key: &ContextKey<T>) -> Option<&T>

Get a value from the context.

Arguments

• key - The context key

Returns

A reference to the value if it exists, or None.

Examples

use do_over::context::{Context, ContextKey};

static KEY: ContextKey<String> = ContextKey::new("key");

let mut ctx = Context::new();
ctx.insert(&KEY, "value".to_string());

assert_eq!(ctx.get(&KEY), Some(&"value".to_string()));

pub fn remove<T: Send + Sync + Clone + 'static>( &mut self, key: &ContextKey<T>, ) -> Option<T>

Remove a value from the context.

Arguments

• key - The context key

Returns

The removed value if it existed (cloned before removal).

pub fn contains<T: Send + Sync + 'static>(&self, key: &ContextKey<T>) -> bool

Check if the context contains a key.

pub fn clear(&mut self)

Clear all values from the context.

Trait Implementations

impl Clone for Context

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for Context

fn default() -> Context

Returns the “default value” for a type.