Slide 1

Slide 1 text

One Share to Rule Them All Relevant Changes in RxJs 7 for Angular Applications Angular Meetup Graz, 7.9.2021 Rainer Hahnekamp https://www.youtube.com/watch?v=O0g0rWi_2Yk https://github.com/rainerhahnekamp/rxjs7-changes-in-angular

Slide 2

Slide 2 text

About Me ● Rainer Hahnekamp ANGULARarchitects.io ● Trainings and Consultancy ● > 20 Years Experience @rainerhahnekamp https://angulararchitects.io/workshops

Slide 3

Slide 3 text

Agenda ● Noteworthy Changes in RxJs 7 ○ toPromise ○ combineLatest() ○ imports ● Share & ShareConfig

Slide 4

Slide 4 text

toPromise // old version await of(1, 2).toPromise(); // c = 2 await of().toPromise(); // undefined // new version await firstValueFrom(of(1, 2)); // a = 1; await lastValueFrom(of(1, 2)); // b = 2; await firstValueFrom(of()); // error

Slide 5

Slide 5 text

combineLatest const letters$ = of(['a', 'b', 'c']); const numbers$ = of([1, 2, 3]); // old version combineLatest([letters$, numbers$]).subscribe(([letters, numbers]) => { console.log(letters); // ['a', 'b', 'c'] console.log(numbers); // [1, 2, 3] }); // new version combineLatest({ letters: letters$, numbers: numbers$ }).subscribe( ({ letters, numbers }) => { console.log(letters); // ['a', 'b', 'c'] console.log(numbers); // [1, 2, 3] } );

Slide 6

Slide 6 text

imports import { of, map, delay, first } from 'rxjs'; of(1).pipe( map((n) => n + 1), delay(100), first() );

Slide 7

Slide 7 text

No content

Slide 8

Slide 8 text

Source Backend share() Subject

Slide 9

Slide 9 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject

Slide 10

Slide 10 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject

Slide 11

Slide 11 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject

Slide 12

Slide 12 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 1

Slide 13

Slide 13 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 1

Slide 14

Slide 14 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 0

Slide 15

Slide 15 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 1 A

Slide 16

Slide 16 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 1 A

Slide 17

Slide 17 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1

Slide 18

Slide 18 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1

Slide 19

Slide 19 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1

Slide 20

Slide 20 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1

Slide 21

Slide 21 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 2

Slide 22

Slide 22 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject B Runs: 2

Slide 23

Slide 23 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject B Runs: 2

Slide 24

Slide 24 text

Source Subscriber 1 Backend B A Subscriber 2 B A Subscriber 3 B share() Subject Runs: 2

Slide 25

Slide 25 text

Source Subscriber 1 Backend B A Subscriber 2 B A Subscriber 3 B share() Subject Runs: 2

Slide 26

Slide 26 text

What if... 1. a subscriber joins too late and the source is still active?

Slide 27

Slide 27 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 0

Slide 28

Slide 28 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject ReplaySubject(1) Runs: 0

Slide 29

Slide 29 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() ReplaySubject Runs: 1 A

Slide 30

Slide 30 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() ReplaySubject Runs: 1 A

Slide 31

Slide 31 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 A

Slide 32

Slide 32 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 A

Slide 33

Slide 33 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 A

Slide 34

Slide 34 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 A

Slide 35

Slide 35 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 A A

Slide 36

Slide 36 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 A A

Slide 37

Slide 37 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject B Runs: 2 A A

Slide 38

Slide 38 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject B Runs: 2 A

Slide 39

Slide 39 text

Source Subscriber 1 Backend B A Subscriber 2 B A Subscriber 3 B share() ReplaySubject Runs: 2 A B

Slide 40

Slide 40 text

Source Subscriber 1 Backend B A Subscriber 2 B A Subscriber 3 B share() ReplaySubject Runs: 2 A B

Slide 41

Slide 41 text

What if... 1. a subscriber joins too late and the source is still active? 2. a subscriber joins too late and the source completed?

Slide 42

Slide 42 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 1 A Default Behaviour on completed source

Slide 43

Slide 43 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 1 A Default Behaviour on completed source

Slide 44

Slide 44 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 Default Behaviour on completed source

Slide 45

Slide 45 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 Default Behaviour on completed source

Slide 46

Slide 46 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 Default Behaviour on completed source

Slide 47

Slide 47 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 Default Behaviour on completed source

Slide 48

Slide 48 text

Source Subscriber 1 Backend Runs: 1 A Subscriber 2 A Subscriber 3 share() Subject Default Behaviour on completed source

Slide 49

Slide 49 text

Source Subscriber 1 Backend Runs: 1 A Subscriber 2 A Subscriber 3 share() Subject Default Behaviour on completed source

Slide 50

Slide 50 text

Source Subscriber 1 Backend Runs: 1 A Subscriber 2 A Subscriber 3 share() Subject Default Behaviour on completed source

Slide 51

Slide 51 text

Source Subscriber 1 Backend Runs: 1 A Subscriber 2 A Subscriber 3 share() Subject Default Behaviour on completed source

Slide 52

Slide 52 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 1 A A Default Behaviour on completed source

Slide 53

Slide 53 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 2 B A A Default Behaviour on completed source

Slide 54

Slide 54 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 2 B A A Default Behaviour on completed source

Slide 55

Slide 55 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 2 B A A Default Behaviour on completed source

Slide 56

Slide 56 text

No content

Slide 57

Slide 57 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 share({ resetOnComplete: false })

Slide 58

Slide 58 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 share({ resetOnComplete: false })

Slide 59

Slide 59 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 share({ resetOnComplete: false })

Slide 60

Slide 60 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 share({ resetOnComplete: false })

Slide 61

Slide 61 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 share({ resetOnComplete: false })

Slide 62

Slide 62 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 share({ resetOnComplete: false })

Slide 63

Slide 63 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 share({ connector: new ReplaySubject(), resetOnComplete: false }) A

Slide 64

Slide 64 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 share({ connector: new ReplaySubject(), resetOnComplete: false }) A A

Slide 65

Slide 65 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 share({ connector: new ReplaySubject(), resetOnComplete: false }) A A

Slide 66

Slide 66 text

What if... 1. a subscriber joins too late and the source is still active? 2. a subscriber joins too late and the source completed? 3. a subscriber joins and everyone else has unsubscribed?

Slide 67

Slide 67 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 1 A Default Behaviour on unsubscribed

Slide 68

Slide 68 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 1 A Default Behaviour on unsubscribed

Slide 69

Slide 69 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 Default Behaviour on unsubscribed

Slide 70

Slide 70 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 Default Behaviour on unsubscribed

Slide 71

Slide 71 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 Default Behaviour on unsubscribed

Slide 72

Slide 72 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 Default Behaviour on unsubscribed

Slide 73

Slide 73 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 Default Behaviour on unsubscribed

Slide 74

Slide 74 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Runs: 1 Default Behaviour on unsubscribed

Slide 75

Slide 75 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() Subject Default Behaviour on unsubscribed

Slide 76

Slide 76 text

Source Subscriber 1 Backend Runs: 1 A Subscriber 2 A Subscriber 3 share() Subject Default Behaviour on unsubscribed

Slide 77

Slide 77 text

Source Subscriber 1 Backend Runs: 1 A Subscriber 2 A Subscriber 3 share() Subject Default Behaviour on unsubscribed

Slide 78

Slide 78 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 1 A A Default Behaviour on unsubscribed

Slide 79

Slide 79 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 2 B A A Default Behaviour on unsubscribed

Slide 80

Slide 80 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 2 B A A Default Behaviour on unsubscribed

Slide 81

Slide 81 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() Subject Runs: 2 B A A Default Behaviour on unsubscribed

Slide 82

Slide 82 text

No content

Slide 83

Slide 83 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 share({ connector: new ReplaySubject(), resetOnComplete: false, resetOnRefCountZero: false }) A

Slide 84

Slide 84 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 A share({ connector: new ReplaySubject(), resetOnComplete: false, resetOnRefCountZero: false })

Slide 85

Slide 85 text

Source Subscriber 1 Backend A Subscriber 2 A Subscriber 3 share() ReplaySubject Runs: 1 A share({ connector: new ReplaySubject(), resetOnComplete: false, resetOnRefCountZero: false })

Slide 86

Slide 86 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() ReplaySubject Runs: 1 A A A share({ connector: new ReplaySubject(), resetOnComplete: false, resetOnRefCountZero: false })

Slide 87

Slide 87 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() ReplaySubject Runs: 1 A A A A share({ connector: new ReplaySubject(), resetOnComplete: false, resetOnRefCountZero: false })

Slide 88

Slide 88 text

Source Subscriber 1 Backend Subscriber 2 Subscriber 3 share() ReplaySubject Runs: 1 A A A A share({ connector: new ReplaySubject(), resetOnComplete: false, resetOnRefCountZero: false })

Slide 89

Slide 89 text

What if... 1. a subscriber joins too late and the source is still active? 2. a subscriber joins too late and the source completed? 3. a subscriber joins and everyone else has unsubscribed? 4. the source emits an error?

Slide 90

Slide 90 text

Summary ● Try to use share for all multicasting operations ● toPromise deprecated ● combinateLatest with object notation ● import ☹ statements changed