当Kotlin通道满时执行一段代码

这并不是现成的,但相应的批处理逻辑可以使用actor轻松实现。您并不需要一个类来实现这一点(但如果愿意,可以将此代码封装在一个类中)。您可以使用以下实现作为模板:

const val MAX_SIZE = 100 // max number of data items in batch
const val MAX_TIME = 1000 // max time (in ms) to wait

val batchActor = actor<Data> {
    val batch = mutableListOf<Data>()
    var deadline = 0L // deadline for sending this batch to DB
    while (true) {
        // when deadline is reached or size is exceeded, then force batch to DB
        val remainingTime = deadline - System.currentTimeMillis()
        if (batch.isNotEmpty() && remainingTime <= 0 || batch.size >= MAX_SIZE) {
            saveToDB(batch)
            batch.clear()
            continue
        }
        // wait until items is received or timeout reached
        select<Unit> {
            // when received -> add to batch
            channel.onReceive {
                batch.add(it)
                // init deadline on first item added to batch
                if (batch.size == 1) deadline = System.currentTimeMillis() + MAX_TIME
            }
            // when timeout is reached just finish select, note: no timeout when batch is empty
            if (batch.isNotEmpty()) onTimeout(remainingTime) {}
        }
    }
}

现在你就这么做 batchActor.send(data) 当您需要向数据库发送任何内容时,actor内部的逻辑负责批处理并将结果批保存到数据库中。

通道接口声明了一个isFull属性,可以查询该属性以确定其是否已达到容量。

我看不出是否有回调函数在达到容量时自动调用函数,但您可以定期检查此isFull属性以查看它是否达到容量。