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Commit7ba8cde

Browse files
wjanaszekSikora00
authored andcommitted
feat: check out book
1 parentbe8b306 commit7ba8cde

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9 files changed

+202
-0
lines changed

9 files changed

+202
-0
lines changed
Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,12 @@
1+
import{BookId,PatronId}from'@library/lending/domain';
2+
import{Result}from'@library/shared/domain';
3+
import{Command}from'@nestjs-architects/typed-cqrs';
4+
5+
exportclassCheckOutBookCommandextendsCommand<Result>{
6+
constructor(
7+
publicreadonlypatronId:PatronId,
8+
publicreadonlybookId:BookId
9+
){
10+
super();
11+
}
12+
}
Lines changed: 81 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,81 @@
1+
import{BookRepository,PatronRepository}from'@library/lending/application';
2+
import{
3+
Book,
4+
BookCheckedOut,
5+
BookCheckOutFailed,
6+
BookId,
7+
Patron,
8+
PatronId,
9+
}from'@library/lending/domain';
10+
import{InvalidArgumentException,Result}from'@library/shared/domain';
11+
import{IInferredCommandHandler}from'@nestjs-architects/typed-cqrs';
12+
import{CommandHandler}from'@nestjs/cqrs';
13+
import{match}from'fp-ts/Either';
14+
import{pipe}from'fp-ts/function';
15+
import{getOrElseW}from'fp-ts/Option';
16+
import{CheckOutBookCommand}from'./check-out-book.command';
17+
18+
@CommandHandler(CheckOutBookCommand)
19+
exportclassCheckOutBookHandler
20+
implementsIInferredCommandHandler<CheckOutBookCommand>
21+
{
22+
constructor(
23+
privatereadonlybookRepository:BookRepository,
24+
privatereadonlypatronRepository:PatronRepository
25+
){}
26+
27+
asyncexecute(command:CheckOutBookCommand):Promise<Result>{
28+
constbook=awaitthis.findBook(command.bookId);
29+
constpatron=awaitthis.findPatron(command.patronId);
30+
constresult=patron.checkoutBook(book);
31+
returnpipe(
32+
result,
33+
match<BookCheckOutFailed,BookCheckedOut,Promise<Result>>(
34+
this.publishOnFail.bind(this),
35+
this.publishOnSuccess.bind(this)
36+
)
37+
);
38+
}
39+
40+
privatefindBook(id:BookId):Promise<Book>{
41+
returnthis.bookRepository.findById(id).then((result)=>
42+
pipe(
43+
result,
44+
getOrElseW(()=>{
45+
thrownewInvalidArgumentException(
46+
`Cannot find available book with Id:${id}`
47+
);
48+
})
49+
)
50+
);
51+
}
52+
53+
privatefindPatron(patronId:PatronId):Promise<Patron>{
54+
returnthis.patronRepository.findById(patronId).then((result)=>
55+
pipe(
56+
result,
57+
getOrElseW(()=>{
58+
thrownewInvalidArgumentException(
59+
`Patron with given Id does not exists:${patronId}`
60+
);
61+
})
62+
)
63+
);
64+
}
65+
66+
privateasyncpublishOnFail(
67+
bookCheckOutFailed:BookCheckOutFailed
68+
):Promise<Result.Rejection>{
69+
awaitthis.patronRepository.publish(bookCheckOutFailed);
70+
71+
returnResult.Rejection;
72+
}
73+
74+
privateasyncpublishOnSuccess(
75+
bookCheckedOut:BookCheckedOut
76+
):Promise<Result.Success>{
77+
awaitthis.patronRepository.publish(bookCheckedOut);
78+
79+
returnResult.Success;
80+
}
81+
}

‎libs/lending/application/src/lib/lending-application.module.ts‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2,6 +2,7 @@ import { DynamicModule, Module, ModuleMetadata } from '@nestjs/common';
22
import{CqrsModule}from'@nestjs/cqrs';
33
import{BookPlacedOnHoldEventHandler}from'./book-placed-on-hold.event-handler';
44
import{CancelHoldHandler}from'./cancel-hold/cancel-hold.handler';
5+
import{CheckOutBookHandler}from'./check-out/check-out-book.handler';
56
import{LendingFacade}from'./lending.facade';
67
import{PlaceOnHoldHandler}from'./place-on-hold/place-on-hold.handler';
78
import{DuplicateHoldEventHandler}from'./duplicate-hold.event.handler';
@@ -14,6 +15,7 @@ import { CreateAvailableBookOnInstanceAddedEventHandler } from './create-availab
1415
BookHoldCanceledEventHandler,
1516
BookPlacedOnHoldEventHandler,
1617
CancelHoldHandler,
18+
CheckOutBookHandler,
1719
CreateAvailableBookOnInstanceAddedEventHandler,
1820
DuplicateHoldEventHandler,
1921
LendingFacade,

‎libs/lending/domain/src/index.ts‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2,6 +2,8 @@ export * from './lib/book/available-book';
22
export*from'./lib/book/book';
33
export*from'./lib/book/book-on-hold';
44
export*from'./lib/book/book-duplicate-hold-found.event';
5+
export*from'./lib/events/book-check-out-failed';
6+
export*from'./lib/events/book-checked-out';
57
export*from'./lib/events/book-hold-canceled';
68
export*from'./lib/events/book-hold-canceling-failed';
79
export*from'./lib/events/book-hold-failed';
Lines changed: 17 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,17 @@
1+
import{PatronId}from'../value-objects/patron-id';
2+
import{Rejection}from'../policies/placing-on-hold-policy';
3+
import{PatronEvent}from'./patron-event';
4+
5+
exportclassBookCheckOutFailedimplementsPatronEvent{
6+
privateconstructor(
7+
publicreadonlyreason:string,
8+
publicreadonlypatronId:PatronId
9+
){}
10+
11+
staticbookCheckOutFailedBecause(
12+
rejection:Rejection,
13+
patronId:PatronId
14+
):BookCheckOutFailed{
15+
returnnewBookCheckOutFailed(rejection.reason,patronId);
16+
}
17+
}
Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,6 @@
1+
import{PatronId}from'../value-objects/patron-id';
2+
import{PatronEvent}from'./patron-event';
3+
4+
exportclassBookCheckedOutimplementsPatronEvent{
5+
constructor(publicreadonlypatronId:PatronId){}
6+
}

‎libs/lending/domain/src/lib/factories/patron.factory.ts‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,5 @@
11
import{Patron}from'../patron';
2+
import{allCheckingOutPolicies}from'../policies/checking-out.policy';
23
import{allCurrentPolicies}from'../policies/placing-on-hold-policy';
34
import{BookId}from'../value-objects/book-id';
45
import{Hold}from'../value-objects/hold';
@@ -15,6 +16,7 @@ export class PatronFactory {
1516
patronHolds:Set<[BookId,LibraryBranchId]>
1617
):Patron{
1718
returnnewPatron(
19+
allCheckingOutPolicies,
1820
newPatronHolds(
1921
newSet(
2022
[...patronHolds].map(

‎libs/lending/domain/src/lib/patron.ts‎

Lines changed: 29 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1,13 +1,17 @@
11
import{Either,isLeft,left,right}from'fp-ts/lib/Either';
22
import{getLeft,isNone,none,Option}from'fp-ts/lib/Option';
33
import{AvailableBook}from'./book/available-book';
4+
import{Book}from'./book/book';
45
import{BookOnHold}from'./book/book-on-hold';
6+
import{BookCheckOutFailed}from'./events/book-check-out-failed';
7+
import{BookCheckedOut}from'./events/book-checked-out';
58
import{BookHoldCancelingFailed}from'./events/book-hold-canceled';
69
import{BookHoldCanceled}from'./events/book-hold-canceling-failed';
710
import{BookHoldFailed}from'./events/book-hold-failed';
811
import{BookPlacedOnHold}from'./events/book-placed-on-hold';
912
import{BookPlacedOnHoldEvents}from'./events/book-placed-on-hold-events';
1013
import{MaximumNumberOhHoldsReached}from'./events/maximum-number-on-holds-reached';
14+
import{CheckingOutPolicy}from'./policies/checking-out.policy';
1115
import{
1216
PlacingOnHoldPolicy,
1317
Rejection,
@@ -18,6 +22,7 @@ import { PatronInformation } from './value-objects/patron-information';
1822

1923
exportclassPatron{
2024
constructor(
25+
privatereadonlycheckingOutPolicies:Set<CheckingOutPolicy>,
2126
privatereadonlypatronHolds:PatronHolds,
2227
privatereadonlyplacingOnHoldPolicies:Set<PlacingOnHoldPolicy>,
2328
privatereadonlypatronInformation:PatronInformation
@@ -38,6 +43,30 @@ export class Patron {
3843
returnleft(newBookHoldCancelingFailed(this.patronInformation.patronId));
3944
}
4045

46+
checkoutBook(
47+
book:Book
48+
):Either<BookCheckOutFailed,BookCheckedOut>{
49+
constrejection=this.patronCanCheckout(book);
50+
51+
if(!isNone(rejection)){
52+
returnleft(
53+
BookCheckOutFailed.bookCheckOutFailedBecause(
54+
rejection.value,
55+
this.patronInformation.patronId
56+
)
57+
);
58+
}
59+
60+
returnright(newBookCheckedOut(this.patronInformation.patronId));
61+
}
62+
63+
privatepatronCanCheckout(book:Book):Option<Rejection>{
64+
constrejection=[...this.checkingOutPolicies]
65+
.map((policy)=>policy(book,this.patronInformation.patronId))
66+
.find(isLeft);
67+
returnrejection ?getLeft(rejection) :none;
68+
}
69+
4170
isRegular():boolean{
4271
returnthis.patronInformation.isRegular();
4372
}
Lines changed: 51 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,51 @@
1+
import{Either,left,right}from'fp-ts/Either';
2+
import{Book}from'../book/book';
3+
import{BookOnHold}from'../book/book-on-hold';
4+
import{PatronId}from'../value-objects/patron-id';
5+
6+
exportinterfaceCheckingOutPolicy{
7+
(book:Book,patronId:PatronId):Either<Rejection,Allowance>;
8+
}
9+
10+
exportconstbookIsOnHold:CheckingOutPolicy=(
11+
toCheckout:Book,
12+
_:PatronId
13+
)=>{
14+
if(!(toCheckoutinstanceofBookOnHold)){
15+
returnleft(
16+
Rejection.withReason(
17+
'Cannot checkout book which is not on hold'
18+
)
19+
);
20+
}
21+
returnright(newAllowance());
22+
};
23+
24+
exportconstbookIsOnHoldByThePatron:CheckingOutPolicy=(
25+
toCheckout:Book,
26+
patronId:PatronId
27+
)=>{
28+
if(toCheckoutinstanceofBookOnHold&&!toCheckout.by(patronId)){
29+
returnleft(
30+
Rejection.withReason(
31+
'Cannot checkout book which is on hold by different patron'
32+
)
33+
);
34+
}
35+
returnright(newAllowance());
36+
};
37+
38+
exportconstallCheckingOutPolicies:Set<CheckingOutPolicy>=newSet([
39+
bookIsOnHold,
40+
bookIsOnHoldByThePatron,
41+
]);
42+
43+
exportclassAllowance{}
44+
45+
exportclassRejection{
46+
privateconstructor(publicreadonlyreason:string){}
47+
48+
staticwithReason(reason:string):Rejection{
49+
returnnewRejection(reason);
50+
}
51+
}

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