本文整理汇总了TypeScript中rx.Observable.defer方法的典型用法代码示例。如果您正苦于以下问题：TypeScript Observable.defer方法的具体用法？TypeScript Observable.defer怎么用？TypeScript Observable.defer使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类rx.Observable的用法示例。
在下文中一共展示了Observable.defer方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: newConnection
/**
* Create a new instance of RxConnection, which wraps the amqplib Connection obj.
*
* @param url URL to AMQP host. eg: amqp://localhost/
* @param options Custom AMQP options
* @returns {RxConnection}
*/
public static newConnection(url: string, options?: any): Rx.Observable<RxConnection> {
// Doing it like this to make it a cold observable. When starting with the promise directly, the node application
// stays open as AmqpLib connects straight away, and not when you subscribe to the stream.
return Rx.Observable
.defer(() => AmqpLib.connect(url, options))
.flatMap<RxConnection>((conn: Connection): any => {
// Disposable observable to close connection
const connectionDisposer = Rx.Disposable.create(() => conn.close().catch(err => Rx.Observable.throw(err)));
// New RxConnection stream
const sourceConnection = Rx.Observable.of(new RxConnection(conn));
// Stream of close events from connection
const closeEvents = Rx.Observable.fromEvent(conn, 'close');
// Stream of Errors from error connection event
const errorEvents = Rx.Observable.fromEvent(conn, 'error')
.flatMap((error: any) => Rx.Observable.throw(error));
// Stream of open connections, that will emit RxConnection until a close event
const connection = Rx.Observable
.merge(sourceConnection, errorEvents)
.takeUntil(closeEvents);
// Return the disposable connection resource
return Rx.Observable.using(
() => connectionDisposer,
() => connection
)
});
}