♻️ Refactoring for AOJ API client (#1995) #1999
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""" WalkthroughThe changes refactor the Aizu Online Judge API client by removing its internal cache and monolithic methods, replacing them with a modular, layered client design that composes specialized clients for courses and challenges. A new generic cache class with TTL and size limits is introduced in a separate module, alongside a caching strategy class. Comprehensive tests for the cache are added. Import paths for a shared client class are updated. Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant AOJApiClient
participant CoursesClient
participant ChallengesClient
participant ContestTaskCache
participant HttpRequestClient
Client->>AOJApiClient: getContests()/getTasks()
AOJApiClient->>CoursesClient: getContests()/getTasks()
AOJApiClient->>ChallengesClient: getContests()/getTasks()
CoursesClient->>ContestTaskCache: getCachedOrFetchContests()/getCachedOrFetchTasks()
ChallengesClient->>ContestTaskCache: getCachedOrFetchContests()/getCachedOrFetchTasks()
ContestTaskCache->>Cache: get(key)
alt Cache hit
Cache-->>ContestTaskCache: cached data
else Cache miss
ContestTaskCache->>HttpRequestClient: fetchApiWithConfig()
HttpRequestClient-->>ContestTaskCache: fetched data
ContestTaskCache->>Cache: set(key, data)
end
ContestTaskCache-->>CoursesClient/ChallengesClient: data
CoursesClient/ChallengesClient-->>AOJApiClient: data
AOJApiClient-->>Client: combined data
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Actionable comments posted: 2
🔭 Outside diff range comments (1)
src/lib/clients/aizu_online_judge.ts (1)
141-151: 🛠️ Refactor suggestionUpdate constructor JSDoc to match implementation.
The JSDoc for the constructor mentions Cache parameters, but it actually takes an ApiClientConfig object. This appears to be a leftover from before the refactoring.
/** * Constructs an instance of the Aizu Online Judge client. * * @param {ApiClientConfig} [config] - Optional configuration object for the API client. - * @param {Cache<ContestsForImport>} [config.contestCache] - Configuration for the contest cache. - * @param {number} [config.contestCache.timeToLive] - Time to live for contest cache entries. - * @param {number} [config.contestCache.maxSize] - Maximum size of the contest cache. - * @param {Cache<TasksForImport>} [config.taskCache] - Configuration for the task cache. - * @param {number} [config.taskCache.timeToLive] - Time to live for task cache entries. - * @param {number} [config.taskCache.maxSize] - Maximum size of the task cache. + * @param {CacheConfig} [config.contestCache] - Configuration for the contest cache. + * @param {CacheConfig} [config.taskCache] - Configuration for the task cache. */
🧹 Nitpick comments (7)
src/lib/clients/cache.ts (5)
63-65: Document the key length restriction.The validation enforces a maximum length of 255 characters for keys, but there's no explanation for this specific limit in the documentation.
/** * Sets a new entry in the cache with the specified key and data. * If the cache size exceeds the maximum limit, the oldest entry is removed. * + * @throws {Error} If the key is empty, not a string, or longer than 255 characters. * @param key - The key associated with the data to be cached. * @param data - The data to be cached. */
126-148: Add JSDoc comments to private methods.The private methods lack JSDoc comments, unlike the public methods. Adding documentation to these methods would improve maintainability and consistency.
+/** + * Removes expired entries from the cache. + * This method is called periodically by the cleanup interval. + */ private cleanup(): void { const now = Date.now(); for (const [key, entry] of this.cache.entries()) { if (now - entry.timestamp > this.timeToLive) { this.cache.delete(key); } } } +/** + * Finds the key of the oldest entry in the cache based on timestamp. + * + * @returns The key of the oldest entry, or undefined if the cache is empty. + */ private findOldestEntry(): string | undefined { let oldestKey: string | undefined; let oldestTime = Infinity; for (const [key, entry] of this.cache.entries()) { if (entry.timestamp < oldestTime) { oldestTime = entry.timestamp; oldestKey = key; } } return oldestKey; }
168-168: Add JSDoc comment for the DEFAULT_MAX_CACHE_SIZE constant.The DEFAULT_MAX_CACHE_SIZE constant lacks a JSDoc comment, unlike the DEFAULT_CACHE_TTL constant.
/** * The time-to-live (TTL) for the cache, specified in milliseconds. * This value represents 1 hour. */ const DEFAULT_CACHE_TTL = 60 * 60 * 1000; // 1 hour in milliseconds +/** + * The default maximum number of entries the cache can hold. + * This value represents 50 entries. + */ const DEFAULT_MAX_CACHE_SIZE = 50;
177-180: Consider exporting CacheConfig interface.The CacheConfig interface is used in the exported ApiClientConfig, but it's not exported itself. Exporting it would make it reusable for other modules that need to configure the Cache.
-interface CacheConfig { +export interface CacheConfig { timeToLive?: number; maxSize?: number; }
189-192: Consider moving ApiClientConfig to a more specific location.The ApiClientConfig interface is tightly coupled with API client functionality, but it's in a generic cache module. Consider moving it to a more specific client-related file.
src/test/lib/clients/cache.test.ts (2)
15-30: Add test for TTL = 0 in constructor validation.The current tests check negative TTL values, but not zero, which should also throw an error according to the implementation.
test('expects to throw error if TTL is not positive', () => { expect(() => new Cache<string>(-1)).toThrow('TTL must be positive'); expect(() => new Cache<string>(-2)).toThrow('TTL must be positive'); + expect(() => new Cache<string>(0)).toThrow('TTL must be positive'); });
191-205: Add test for health information when the cache is empty.The current test validates health information for a non-empty cache, but it would be valuable to test the edge case of an empty cache to ensure it doesn't crash.
describe('health', () => { test('expects to report correct health information', () => { const cache = new Cache<string>(); vi.setSystemTime(new Date('2023-01-01T00:00:00.000Z')); cache.set('key1', 'value1'); vi.setSystemTime(new Date('2023-01-01T00:00:01.000Z')); cache.set('key2', 'value2'); const health = cache.health; expect(health.size).toBe(2); expect(health.oldestEntry).toBe(new Date('2023-01-01T00:00:00.000Z').getTime()); }); + test('expects to handle empty cache health information', () => { + const cache = new Cache<string>(); + const health = cache.health; + expect(health.size).toBe(0); + // The behavior for oldestEntry depends on your implementation + }); });
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🔇 Additional comments (8)
src/lib/clients/cache.ts (2)
1-7: Excellent documentation for the Cache class!The initial class documentation is clear, comprehensive, and explains the purpose and behavior of the cache very well.
8-30: Well-structured class constructor with proper validation.Good job validating the input parameters and setting sensible defaults. The setup of the cleanup interval is appropriate.
src/lib/clients/aizu_online_judge.ts (2)
3-3: Good job refactoring the cache implementation.Extracting the cache implementation into a separate reusable module improves code organization and maintainability. The import statement is clean and specific.
152-163: Well-implemented cache initialization in the constructor.The constructor properly initializes the cache instances with the provided configuration, making good use of the new generic Cache class.
src/test/lib/clients/cache.test.ts (4)
4-14: Well-structured test suite with proper setup and teardown.The test suite is organized logically with good use of Vitest's testing features. The setup with fake timers is appropriate for testing time-dependent cache behavior.
97-115: Excellent test coverage for cache eviction behavior.The tests thoroughly verify that the cache properly evicts the oldest entry when the maximum size is reached.
229-246: Great test for automatic cleanup of expired entries.The test verifies an important aspect of the cache's behavior - the automatic cleanup of expired entries. This ensures the cache won't grow unbounded with expired entries.
247-259: Well-implemented test for the dispose method.The test properly verifies that the dispose method clears the cleanup interval and empties the cache, which is essential for preventing memory leaks.
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♻️ Duplicate comments (1)
src/lib/clients/cache.ts (1)
106-110: Update JSDoc comment in the dispose method.The JSDoc comment still refers to "client" which appears to be a remnant from the original implementation. This should be updated to refer to the "Cache instance" for clarity and consistency.
/** * Disposes of resources used by the cache instance. * * This method clears the interval used for cleanup and clears the cache. - * It should be called when the client is no longer needed to prevent memory leaks. + * It should be called when the cache instance is no longer needed to prevent memory leaks. */
🧹 Nitpick comments (2)
src/lib/clients/cache.ts (2)
151-163: Consider optimizing the findOldestEntry method.While the current implementation works well, for very large caches, you might want to consider maintaining a separate data structure (like a min-heap) to track entry age more efficiently. However, given the default max size of 50, the current implementation is perfectly adequate.
1-212: Consider adding a 'has' method to check for key existence.The current implementation doesn't provide a way to check if a key exists in the cache without potentially removing expired entries. Adding a
hasmethod that checks existence without side effects could be useful./** * Checks if a key exists in the cache without removing expired entries. * * @param key - The key to check. * @returns True if the key exists in the cache, false otherwise. */ has(key: string): boolean { return this.cache.has(key); }
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🔇 Additional comments (7)
src/lib/clients/cache.ts (7)
1-7: Clean and comprehensive JSDoc for the Cache class.The documentation clearly explains the purpose and functionality of the Cache class, including its automatic cache invalidation and eviction policies. This helps users understand how to use the class effectively.
18-30: Constructor validation looks good.The constructor properly validates that both timeToLive and maxSize are positive values, which prevents potential issues with invalid configurations. The initialization of the cleanup interval is also appropriate.
48-57: Good handling of empty cache case in the health getter.The implementation correctly handles the case when the cache is empty by returning 0 for both size and oldestEntry, preventing the potential issue of returning Infinity for oldestEntry.
68-82: The set method implementation is solid.The method properly validates the key, handles cache eviction when size limit is reached, and updates entries with the current timestamp. The key validation checks for empty strings, non-string values, and excessively long keys, which is a good security practice.
90-103: The get method effectively handles expired entries.The implementation correctly removes entries that have exceeded their TTL when accessed, which helps maintain cache integrity. The method returns undefined for both missing and expired entries, which is a clean design.
136-144: Efficient cleanup implementation.The cleanup method effectively removes expired entries by iterating through the cache and comparing timestamps against the TTL. This implementation is clean and straightforward.
189-211: Well-designed interfaces for cache configuration.The CacheConfig and ApiClientConfig interfaces provide a clean way to configure caching behavior with optional parameters. This design makes the cache system flexible and easy to customize for different use cases.
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Actionable comments posted: 1
🧹 Nitpick comments (3)
src/lib/clients/http_client.ts (2)
32-47: Consider aligning error message content with the existing implementation.While the error handling is thorough, there's an inconsistency in error reporting between the new and old implementations. The new implementation includes the full URL in the error message (line 40), but refers to just the endpoint in the catch block (line 45), while the old implementation consistently refers to the endpoint.
- throw new Error(`${errorMessage}. Response validation failed for ${url}`); + throw new Error(`${errorMessage}. Response validation failed for ${endpoint}`);
115-120: Consider updating theFetchAPIConfigtype to match the new implementation.The
FetchAPIConfigtype still includes thebaseApiUrlproperty, but the newHttpRequestClient.fetchApiWithConfigmethod doesn't use it directly in its config parameter, instead using the base URL from the constructor. This could lead to confusion.export type FetchAPIConfig<T> = { - baseApiUrl: string; endpoint: string; errorMessage: string; validateResponse?: (data: T) => boolean; };src/lib/clients/cache_strategy.ts (1)
43-47: Consider using structured logging instead of console statements.The class uses
console.logfor logging cache hits, which might not be suitable for a production environment. Consider implementing a configurable logging mechanism that can be adjusted based on the environment.
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src/lib/clients/cache_strategy.ts (2)
src/lib/clients/cache.ts (1)
Cache(8-164)src/lib/types/contest.ts (1)
ContestsForImport(21-21)
src/lib/clients/http_client.ts (1)
src/lib/types/contest.ts (1)
ContestsForImport(21-21)
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🔇 Additional comments (5)
src/lib/clients/http_client.ts (3)
5-48: Well-structured HTTP client implementation.The introduction of
HttpRequestClientprovides a more modular approach to making API requests with a configurable base URL. The implementation cleanly handles URL construction, error handling, and response validation.
50-58: Good interface design for API clients.The
TasksApiClientinterface provides a clear contract for API clients with appropriate generic type parameters, which will make implementing and testing clients easier.
60-62: Appropriately marked deprecated class.Properly marking the
ContestSiteApiClientas deprecated with the@deprecatedJSDoc tag helps users understand that they should migrate to the new implementation.src/lib/clients/cache_strategy.ts (2)
1-20: Good separation of concerns for caching strategy.The
ContestTaskCacheclass effectively separates caching logic from data fetching, taking advantage of the genericCacheclass. The constructor cleanly accepts separate caches for different data types.
62-80: Convenience methods improve readability.The
getCachedOrFetchContestsandgetCachedOrFetchTasksmethods provide a nice abstraction over the generic method, making the client code more readable and type-safe.
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Actionable comments posted: 3
🔭 Outside diff range comments (1)
src/lib/clients/http_client.ts (1)
84-102:⚠️ Potential issue
ContestSiteApiClient.fetchApiWithConfignow accepts an optionalbaseApiUrlbut still requires it
baseApiUrlwas made optional to deprecate the class, yetnew URL(...)
is invoked unconditionally. Passingundefinedwill throw a
TypeErrorat runtime.
Either keep the parameter mandatory or provide a fallback/error guard:if (!baseApiUrl) { throw new Error('baseApiUrl is required when using ContestSiteApiClient'); }
♻️ Duplicate comments (1)
src/lib/clients/aizu_online_judge.ts (1)
467-507: Same logging concern as above applies to challenge-contest metrics; consider replacingconsole.logwith an injectable logger or removing it entirely.
🧹 Nitpick comments (3)
src/lib/clients/cache.ts (1)
22-30: Prefer using the instance propertythis.timeToLivefor clarityInside the constructor you validate
timeToLiveand pass it to
setInterval().
Because the parameter name shadows the class property generated by the
parameter-property syntax, readers may wonder which value is being used.
Switching tothis.timeToLiveremoves any ambiguity and keeps the body
consistent with the rest of the class.-if (timeToLive <= 0) { +if (this.timeToLive <= 0) { throw new Error('TTL must be positive'); } ... -this.cleanupInterval = setInterval(() => this.cleanup(), timeToLive); +this.cleanupInterval = setInterval(() => this.cleanup(), this.timeToLive);src/lib/clients/http_client.ts (1)
46-56:fetchApiWithConfigswallows original error detailsWrapping the caught error in a new
Errorstring-interpolates the
original object, which frequently yields[object Object], losing the
stack trace and message. Preserve the original error ascause
(ES2022) or append its message explicitly:} catch (error) { - throw new Error(`Failed to fetch from ${endpoint}: ${error}`); + throw new Error(`Failed to fetch from ${endpoint}: ${error instanceof Error ? error.message : String(error)}`, { cause: error as Error }); }src/lib/clients/aizu_online_judge.ts (1)
377-381: Avoidconsole.login library codeLogging inside a reusable client leaks implementation details and
creates noisy stdout for consumers. Prefer injecting a logger or
wrapping calls behind a debug flag.-console.log(`Found AOJ course: ${coursesForContest.length} contests.`); +// this.logger?.debug(`Found AOJ course: ${coursesForContest.length} contests.`);
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🧹 Nitpick comments (2)
src/lib/clients/aizu_online_judge.ts (2)
377-378: Consistent use of debug loggingThe code now consistently uses console.debug for logging counts, which is an improvement over the previous implementation. Consider using a structured logging library in the future for more advanced log filtering and formatting capabilities.
Also applies to: 399-400, 466-469, 506-507
483-491: Minor duplication in API fetch logicThere's some duplication between the API fetching logic in AojCoursesApiClient.getTasks and AojChallengesApiClient.getTasks. Consider extracting common patterns to the base class if this pattern continues to repeat in future implementations.
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src/lib/clients/aizu_online_judge.ts (5)
src/lib/clients/cache.ts (2)
Cache(8-188)size(37-39)src/lib/types/contest.ts (2)
ContestsForImport(21-21)ContestForImport(13-19)src/lib/clients/cache_strategy.ts (1)
ContestTaskCache(10-81)src/lib/clients/http_client.ts (2)
HttpRequestClient(21-61)TasksApiClient(10-13)src/lib/constants/urls.ts (1)
AOJ_API_BASE_URL(9-9)
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🔇 Additional comments (8)
src/lib/clients/aizu_online_judge.ts (8)
1-10: Well-structured imports with clear organizationThe imports have been updated to properly support the new modular architecture, with a clear separation between client components, caching mechanisms, and API constants.
33-70: Strong typing improvements for challenge parametersThe addition of strongly-typed parameters for challenge contests enhances type safety and code self-documentation. The use of mapped types to associate contest types with their corresponding rounds is particularly elegant.
132-163: Good refactoring to a layered client designThe client has been properly refactored to use composition instead of direct implementation. The constructor now correctly initializes caches and specialized clients, maintaining a clean separation of concerns.
173-198: Improved concurrency handling for contest retrievalThe getContests method effectively delegates to specialized clients while maintaining robust error handling through Promise.allSettled. This approach correctly handles failures in individual API calls without breaking the entire operation.
216-241: Consistent implementation pattern between getContests and getTasksThe getTasks method follows the same robust pattern as getContests, providing consistency in the codebase. The error handling and result processing are well implemented.
244-346: Excellent abstract base class implementationThe abstract base class provides a solid foundation with appropriate abstractions. The protected utility methods for endpoint building and data mapping promote code reuse while maintaining encapsulation.
The JSDoc comments are comprehensive and include examples, which is excellent for maintainability.
348-425: Well-implemented courses API clientThe AojCoursesApiClient correctly implements the abstract base class, with proper caching and error handling. The getCourseName method is well preserved from the previous implementation.
427-513: Comprehensive challenges API client implementationThe AojChallengesApiClient handles the more complex scenario of parameterized requests correctly. The caching strategy with dynamic cache keys based on contest type and round is well designed.
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🧹 Nitpick comments (4)
src/lib/clients/aizu_online_judge.ts (4)
71-74: Consider improving type safety for API responseThe
largeClproperty is typed asRecord<string, unknown>, which is very generic. If the structure of this object is known, consider creating a more specific type to improve type safety and code clarity.- readonly largeCl: Record<string, unknown>; + readonly largeCl: { + // Add specific properties here based on the actual structure + };
363-383: Consider extracting common pattern from fetch methodsThe
getContestsandgetTasksmethods in both specialized clients follow a similar pattern of using the cache strategy and making API requests. Consider extracting this pattern to a protected method in the base class to reduce duplication.// In AojTasksApiClientBase +protected async fetchWithCache<T>( + cacheKey: string, + fetchFn: () => Promise<T>, + isTasks: boolean +): Promise<T> { + return isTasks + ? await this.cache.getCachedOrFetchTasks(cacheKey, fetchFn) + : await this.cache.getCachedOrFetchContests(cacheKey, fetchFn); +}
476-512: Consider using a shared method for fetching challenge dataThe
getTasksmethod inAojChallengesApiClientduplicates some of the logic fromgetContests, such as generating the cache key and fetching from the API. Consider extracting a shared method to handle these common operations.+private async fetchChallengeData<T>( + params: ChallengeParams, + isTasks: boolean, + mapFn: (data: AOJChallengeContestAPI) => T +): Promise<T> { + const { contestType, round } = params; + const cacheKey = this.getCacheKey(contestType, round); + const contestTypeLabel = this.getContestTypeLabel(contestType); + + const fetchFunction = async () => { + const results = await this.httpClient.fetchApiWithConfig<AOJChallengeContestAPI>({ + endpoint: this.buildEndpoint(['challenges', 'cl', contestType, round]), + errorMessage: `Failed to fetch ${contestTypeLabel} ${round} ${isTasks ? 'tasks' : 'contests'} from AOJ API`, + validateResponse: (data) => + 'contests' in data && Array.isArray(data.contests) && data.contests.length > 0, + }); + + return mapFn(results); + }; + + return isTasks + ? await this.cache.getCachedOrFetchTasks(cacheKey, fetchFunction) + : await this.cache.getCachedOrFetchContests(cacheKey, fetchFunction); +}
536-538: Consider simplifying the getContestTypeLabel methodThe
getContestTypeLabelmethod simply converts the contest type to uppercase. Since this is a simple operation used in only a few places, consider inlining it instead of having a separate method.-private getContestTypeLabel(contestType: ChallengeContestType): string { - return contestType.toUpperCase(); -} // Then replace calls with: const contestTypeLabel = contestType.toUpperCase();
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src/lib/clients/aizu_online_judge.ts (5)
src/lib/clients/cache.ts (3)
ApiClientConfig(232-235)Cache(8-188)size(37-39)src/lib/types/contest.ts (2)
ContestsForImport(21-21)ContestForImport(13-19)src/lib/clients/cache_strategy.ts (1)
ContestTaskCache(10-81)src/lib/clients/http_client.ts (2)
HttpRequestClient(21-61)TasksApiClient(10-13)src/lib/constants/urls.ts (1)
AOJ_API_BASE_URL(9-9)
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🔇 Additional comments (13)
src/lib/clients/aizu_online_judge.ts (13)
1-4: Good refactoring of importsThe imports have been properly updated to reflect the new modular architecture, replacing the direct use of
ContestSiteApiClientwith the more specializedHttpRequestClientand introducing the new caching components.
9-10: Good use of constantsMoving the base URL to a constants file improves maintainability by centralizing configuration values.
33-42: Well-structured type definitions with proper documentationThe new type definitions for challenge parameters are well-organized and thoroughly documented with JSDoc comments. The use of type mapping in
ChallengeRoundMapto associate contest types with their specific round types is a good application of TypeScript's type system.Also applies to: 49-70
132-135: Good implementation of composition patternTransitioning from inheritance to composition by using specialized client classes is a solid architectural improvement that enhances separation of concerns and modularity.
143-163: Well-structured constructor with clear dependency initializationThe constructor properly initializes and injects dependencies into the specialized clients. This approach improves testability and follows dependency injection principles.
173-198: Effective use of Promise.allSettled for parallel fetchingThe method appropriately uses
Promise.allSettledto fetch contests from multiple sources concurrently, handling errors at both the individual promise level and the overall method level.
216-241: Consistent implementation of getTasks with good error handlingThe implementation of
getTasksfollows the same pattern asgetContests, maintaining consistency in the codebase while providing proper error handling at multiple levels.
244-271: Well-designed abstract base class with comprehensive documentationThe
AojTasksApiClientBaseabstract class is well-documented with clear examples and provides a solid foundation for the concrete implementations. The use of a generic type parameter for the API method parameters is a good practice.
282-306: Robust URL endpoint construction with security validationThe
buildEndpointmethod includes thorough validation of URL segments to prevent potential security issues. The use of regular expressions to validate segments and the encoding of segments are good security practices.
320-328: Clear mapping functions with well-documented limitationsThe mapping functions are concise and include comments explaining the limitations where data is not available from the API. The
mapToTaskfunction handles the mapping of problem IDs to task IDs appropriately.Also applies to: 337-345
377-377: Consistent logging with descriptive messagesThe use of
console.debugfor logging found contests and tasks is consistent across the different client implementations, which is good for maintainability. The messages include the count of items found, making them useful for debugging.Also applies to: 399-399, 467-467, 506-506
441-474: Well-implemented challenge contest fetching with proper cachingThe
getContestsmethod inAojChallengesApiClientcorrectly handles the challenge parameters, generates appropriate cache keys, and uses the cache strategy effectively.
522-527: Good cache key generationThe
getCacheKeymethod creates meaningful and unique cache keys by combining the contest type and round, ensuring that cache entries are properly separated.
close #1995
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