f7c396b0fd
(NEW) Illustrative classes:
- App: simulates a production application
- BusinessOperation<T>: abstraction over any operation that can
potentially fail
- FindCustomer <: BusinessOperation<String>: illustrative
operation that can throw an error
- Retry <: BusinessOperation<T>: transparently implements the
retry mechanism
- Several "business" exceptions:
- BusinessException: top-level
- CustomerNotFoundException: can be ignored
- DatabaseNotAvailableException: fatal error
(NEW) .puml and .png for UML
38 lines
1.0 KiB
Plaintext
38 lines
1.0 KiB
Plaintext
@startuml
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package com.iluwatar.retry {
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class App {
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- LOG : Logger {static}
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- op : BusinessOperation<String> {static}
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+ App()
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- errorNoRetry() {static}
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- errorWithRetry() {static}
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+ main(args : String[]) {static}
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- noErrors() {static}
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}
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interface BusinessOperation<T> {
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+ perform() : T {abstract}
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}
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class FindCustomer {
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- customerId : String
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- errors : Deque<BusinessException>
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+ FindCustomer(customerId : String, errors : BusinessException[])
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+ perform() : String
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}
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class Retry<T> {
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- attempts : AtomicInteger
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- delay : long
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- errors : List<Exception>
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- maxAttempts : int
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- op : BusinessOperation<T>
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- test : Predicate<Exception>
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+ Retry<T>(op : BusinessOperation<T>, maxAttempts : int, delay : long, ignoreTests : Predicate<Exception>[])
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+ attempts() : int
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+ errors() : List<Exception>
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+ perform() : T
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}
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}
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Retry --> "-op" BusinessOperation
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App --> "-op" BusinessOperation
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FindCustomer ..|> BusinessOperation
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Retry ..|> BusinessOperation
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@enduml |