我有关闭：
move |p| match Params::parse::<Value>(p) {
Ok(ref v) if v.as_str().is_some() => {
let chain = v.as_str().unwrap();
match sender.send(chain) {
Ok(_) => futures::done(Ok(Value::Null)).boxed(),
Err(err) => futures::failed(JsonRpcError::invalid_params(
format!("Node not responding: {}", err.to_string())))
.boxed(),
}
}
Ok(_) | Err(_) => {
futures::failed(JsonRpcError::invalid_params("Invalidlabel"))
.boxed()
}
};
编译因错误而失败：
the trait bound `std::sync::mpsc::Sender<&str>: std::marker::Sync` is not satisfied in `[closure@src/rpc/mod.rs:223:13: 237:14 sender:std::sync::mpsc::Sender<&str>]`
不是move关键字应该捕获并克隆Sender吗？
答案 0 :(得分：2)
BEGIN
INSERT
INTO `donut`.`myshop`
SELECT
vs.id
, vs.script_id
, 0 as my_status
, NULL as time_limit
, NULL as time_limit2
, NULL as time_limit3
, NULL as items
FROM
bread.reserve_table rt
LEFT OUTER JOIN baker.view_shops vs
ON rt.id = vs.id
WHERE
rt.start_date = CURRENT_DATE()
AND vs.start_date <> rt.start_date
ON DUPLICATE KEY UPDATE
id = values(id)
, script_id = values(script_id)
, my_status = values(my_status)
, time_limit = values(time_limit)
, time_limit2 = values(time_limit2)
, time_limit3 = values(time_limit3)
, items = values(items);
UPDATE
baker.shops s
SET
start_date = (
SELECT
start_date AS DATE
FROM
bread.reserve_table
WHERE
s.id = id LIMIT 1
)
,end_date = (
SELECT
end_date AS DATE
FROM
bread.reserve_table
WHERE
s.id = id LIMIT 1
)
,random_id = 0
,random_flg = 0
WHERE
EXISTS (
SELECT
1
FROM
bread.reserve_table
WHERE
s.id = bread.reserve_table.id
AND
bread.reserve_table.start_date =CURRENT_DATE()
AND
bread.reserve_table.start_date <> s.start_date
);
END
关键字会导致move对象移动进入闭包，即它专门用于防止借用发生。您的错误消息表明Sender不是sender，这表示实际上并未发生移动。正如@ red75prim所指出的，发生这种情况的一种方法是Sync是一个引用，这将导致它被复制到闭包中，并且反过来要求底层的sender对象为{{ 1}}。
要将mpsc Sender发送到另一个线程，您需要首先克隆它，然后将克隆移动到闭包中：
Sync