Enum OverflowStrategy 

pub enum OverflowStrategy {
    Block,
    DropOldest,
    DropNewest,
    Reject,
}

溢出处理策略

• Block：阻塞等待（async，直到队列有空间）
• DropOldest：丢弃最旧消息后插入新的
• DropNewest：丢弃新消息（返回 Ok，不插入）
• Reject：拒绝（返回 Err）

Variants

Block

阻塞等待（async，直到队列有空间）

DropOldest

丢弃最旧消息后插入新的

DropNewest

丢弃新消息（返回 Ok，不插入）

Reject

拒绝（返回 Err）

Trait Implementations

impl Clone for OverflowStrategy

fn clone(&self) -> OverflowStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for OverflowStrategy

impl Debug for OverflowStrategy

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

Formats the value using the given formatter.

impl Eq for OverflowStrategy

impl PartialEq for OverflowStrategy

fn eq(&self, other: &OverflowStrategy) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for OverflowStrategy