Question

如何基于Single的值产生条件流？例如，在以下示例中，如果getNextAction（nodeId）导致空操作，则我希望链结束，否则继续执行。每个方法都返回Single，而不是Observable。显然，过滤器仅适用于Observables。

          getNextAction(nodeId)
           .flatMap(action -> {
               if (action.isEmpty()) {
                   sendResponse("");
               }
               return Single.just(action);
           })
           //.filter(action -> !action.isEmpty())
           .flatMap(action -> prepareAction(action, nodeId)
            .subscribe(response -> sendResponse(transform(response)));

Answer 1

一种方法可能是：

Sub foo() Dim Source As Workbook Dim wsTarget As Worksheet, wsSource As Worksheet Dim sourceRange As Range Dim targetLastRow As Long, sourceFirstRow As Long Set Source = ThisWorkbook ' ### MODIFY AS NEEDED Set wsSource = Source.Worksheets("Sheet1") '#Source.Worksheets("SUMMARY DATA SHEET") Set sourceRange = wsSource.Range("A8:A18") sourceFirstRow = sourceRange.Find("*", After:=wsSource.Range("A8")).Row Set sourceRange = wsSource.Range("A" & sourceFirstRow & ":A18") Set wsTarget = ThisWorkbook.Worksheets("Sheet2") targetLastRow = wsTarget.Cells(Rows.Count, 2).End(xlUp).Row + 1 wsTarget.Range("B" & targetLastRow).Resize(sourceRange.Rows.Count, 1).Value = _ sourceRange.Value wsTarget.Range("D" & targetLastRow).Resize(sourceRange.Rows.Count, 1).Value = _ sourceRange.Offset(, 3).Value 'etc... End Sub由flatMap转换成getNextAction()
检查操作以立即完成流，或编写一组要完成的操作（例如，准备操作并发送响应）

可能看起来像这样：

Completable

（以上假设getNextAction(nodeId) .flatMapCompletable(action -> { if(action.isEmpty()) { return Completable.complete(); } else { return Completable.fromAction(() -> { // prepareAction()... // sendResponse()... }); } }) .subscribe( () -> System.out.println("## onComplete()"), error -> System.out.println("## onError(" + error.getMessage() + ")") );返回了getNextAction()）

如果没有别的，我希望它能激发一些思想。

基于Single的条件流

1 个答案: