Android flutter Dio锁的巧妙实现方法示例
作者：linversion
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正文
看Dio库源码的时候，发现其拦截器管理的逻辑处用到了一个Lock，这个Lock巧妙地利用了Completer和Future的机制来实现，记录一下。
/// Add lock/unlock API for interceptors.
class Lock {
Future? _lock;
late Completer _completer;
/// 标识拦截器是否被上锁
bool get locked => _lock != null;
/// Lock the interceptor.
///
///一旦请求/响应拦截器被锁，后续传入的请求/响应拦截器将被添加到队列中，它们将不会
///继续，直到拦截器解锁
void lock() {
if (!locked) {
_completer = Completer();
_lock = _completer.future;
}
}
/// Unlock the interceptor. please refer to [lock()]
void unlock() {
if (locked) {
//调用complete()
_completer.complete();
_lock = null;
}
}
/// Clean the interceptor queue.
void clear([String msg = 'cancelled']) {
if (locked) {
//complete[future] with an error
_completer.completeError(msg);
_lock = null;
}
}
/// If the interceptor is locked, the incoming request/response task
/// will enter a queue.
///
/// [callback] the function will return a `Future`
/// @nodoc
Future? enqueue(EnqueueCallback callback) {
if (locked) {
// we use a future as a queue
return _lock!.then((d) => callback());
}
return null;
}
}以上就是Android flutter Dio锁的巧妙实现方法示例的详细内容，更多关于Android flutter Dio锁的资料请关注脚本之家其它相关文章！