我正在尝试找出按顺序组合不同类型的observable的最佳方法，然后比较结果。看看zip和combineLatest，我觉得它们不合适。我该怎么办？
@Test
public void shouldInsertRecord(){
BidsEntity bid = new BidsEntity(/* omitted */);
Observable<Integer> count1 = bidsRepository.getBid(bid.getUserId(), bid.getListingId()).count();
Observable<Boolean> insert = bidsRepository.insertBid(bid);
Observable<Integer> count2 = bidsRepository.getBid(bid.getUserId(), bid.getListingId()).count();
//run count1, run insert, run count2 in that order
//assert that count2 is greater than count1
}
答案 0 :(得分：0)
不是顺序（又称阻塞）是ReactiveX的重点。
看看你的例子，我认为只要插入一个Bid就有一个可以发出值的observable是合理的。然后你订阅那个observable并在一个观察者中做你想做的任何事情。
您已经拥有适合它的设置。让class ViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
collectionView?.delegate = self
collectionView?.contentInset = UIEdgeInsets(top: 0, left: 15, bottom: 0, right: 15)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let x: CGFloat = 50 + CGFloat(arc4random_uniform(50)) // or 128.0, doesn't matter
return CGSize(width: x, height: 28)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 15, left: 0, bottom: 15, right: 0)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat
{
return 15
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 50
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
return collectionView.dequeueReusableCell(withReuseIdentifier: "aaa", for: indexPath)
}
override func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
返回每当添加新Bid时发出的observable，并用单个观察者替换bidsRepository.getBid(...)个变量。