Feat/idr rate aggregator

[BiasCoder]

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[Copilot]

Pull request overview

Implements the “IDR rate aggregator” Spring Boot service: fetches multiple Frankfurter API resources at startup via strategy implementations, stores an immutable snapshot in-memory, and exposes a single polymorphic REST endpoint to serve the preloaded data.

Changes:

• Added Strategy pattern fetchers for latest_idr_rates, historical_idr_usd, and supported_currencies, plus wiring via a Spring Map<String, IDRDataFetcher>.
• Added startup ApplicationRunner that loads all resources once and publishes an immutable snapshot into FinanceDataStore.
• Added REST controller endpoint GET /api/finance/data/{resourceType} and unit tests for fetchers/initializer.

Reviewed changes

Copilot reviewed 21 out of 37 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
target/test-classes/com/allobank/finance/strategy/WebClientStub.class	Compiled test artifact committed (should not be in VCS).
target/test-classes/com/allobank/finance/strategy/SupportedCurrenciesFetcherTest.class	Compiled test artifact committed (should not be in VCS).
target/test-classes/com/allobank/finance/strategy/LatestIdrRatesFetcherTest.class	Compiled test artifact committed (should not be in VCS).
target/test-classes/com/allobank/finance/strategy/HistoricalIdrUsdFetcherTest.class	Compiled test artifact committed (should not be in VCS).
target/test-classes/com/allobank/finance/runner/FinanceDataInitializerTest.class	Compiled test artifact committed (should not be in VCS).
target/classes/com/allobank/finance/strategy/SupportedCurrenciesFetcher.class	Compiled main artifact committed (should not be in VCS).
target/classes/com/allobank/finance/strategy/LatestIdrRatesFetcher.class	Compiled main artifact committed (should not be in VCS).
target/classes/com/allobank/finance/strategy/IDRDataFetcher.class	Compiled main artifact committed (should not be in VCS).
target/classes/com/allobank/finance/strategy/HistoricalIdrUsdFetcher.class	Compiled main artifact committed (should not be in VCS).
target/classes/com/allobank/finance/store/FinanceDataStore.class	Compiled main artifact committed (should not be in VCS).
target/classes/com/allobank/finance/runner/FinanceDataInitializer.class	Compiled main artifact committed (should not be in VCS).
target/classes/com/allobank/finance/exception/FinanceDataLoadException.class	Compiled main artifact committed (should not be in VCS).
target/classes/com/allobank/finance/controller/FinanceDataController.class	Compiled main artifact committed (should not be in VCS).
target/classes/com/allobank/finance/config/FrankfurterClientFactoryBean.class	Compiled main artifact committed (should not be in VCS).
target/classes/com/allobank/finance/config/FetcherStrategyConfig.class	Compiled main artifact committed (should not be in VCS).
target/classes/com/allobank/finance/AlloBankApplication.class	Compiled main artifact committed (should not be in VCS).
target/classes/application.yml	Generated build output committed (should not be in VCS).
src/test/java/com/allobank/finance/strategy/WebClientStub.java	Adds WebClient stub to test URL building and JSON handling.
src/test/java/com/allobank/finance/strategy/SupportedCurrenciesFetcherTest.java	Unit test for currencies fetcher sorting/shape.
src/test/java/com/allobank/finance/strategy/LatestIdrRatesFetcherTest.java	Unit test for latest rates + personalized spread calculation.
src/test/java/com/allobank/finance/strategy/HistoricalIdrUsdFetcherTest.java	Unit test for historical fetcher ordering/URL parameters.
src/test/java/com/allobank/finance/runner/FinanceDataInitializerTest.java	Validates startup runner loads all strategies and store immutability.
src/main/resources/application.yml	Adds Frankfurter client configuration (base URL/timeouts).
src/main/java/com/allobank/finance/strategy/SupportedCurrenciesFetcher.java	Fetches /currencies and transforms to sorted rows.
src/main/java/com/allobank/finance/strategy/LatestIdrRatesFetcher.java	Fetches /latest?base=IDR, computes USD_BuySpread_IDR, adds metadata.
src/main/java/com/allobank/finance/strategy/IDRDataFetcher.java	Introduces strategy interface for polymorphic data resources.
src/main/java/com/allobank/finance/strategy/HistoricalIdrUsdFetcher.java	Fetches historical range and transforms into sorted date rows.
src/main/java/com/allobank/finance/store/FinanceDataStore.java	Thread-safe in-memory store with defensive immutability snapshotting.
src/main/java/com/allobank/finance/runner/FinanceDataInitializer.java	ApplicationRunner that loads each strategy once and publishes to store.
src/main/java/com/allobank/finance/exception/FinanceDataLoadException.java	Custom runtime exception for startup/data load failures.
src/main/java/com/allobank/finance/controller/FinanceDataController.java	Polymorphic endpoint serving immutable preloaded data.
src/main/java/com/allobank/finance/config/FrankfurterClientFactoryBean.java	FactoryBean producing configured WebClient (timeouts/base URL/headers).
src/main/java/com/allobank/finance/config/FetcherStrategyConfig.java	Wires fetcher implementations into idrDataFetcherMap.
src/main/java/com/allobank/finance/AlloBankApplication.java	Adds Spring Boot application entrypoint.
pom.xml	Adds Spring Boot WebFlux + test dependencies and build plugin.
README.md	Updates docs, usage, and architecture notes.
.vscode/settings.json	Adds VS Code workspace settings.

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