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BrianSemiglia/CombineCacheMap 0.5.1
Caching for Combine publishers.
⭐️ 3
🕓 3 weeks ago
iOS macOS watchOS tvOS
.package(url: "https://github.com/BrianSemiglia/CombineCacheMap.git", from: "0.5.1")

CombineCacheMap

// Cache/memoize the output of `Combine.Publishers`.

map { (x: Codable) -> Codable in ... } 🪄 map(cache: .memory()) { ... }
map { (x: Any)     -> Codable in ... } 🪄 map(cache: .memory(), id: \.keyPath) { ... }

Caching

// Maps are executed once per unique `incoming`, replayed when not.

events.map(cache: .memory()) { incoming in
    expensiveOperation(incoming)
}

events.flatMap(cache: .disk(id: "foo")) { incoming in
    Just(expensiveOperation(incoming))
}

Conditional Caching

// Caching When
events.map(cache: .memory()) { incoming in
    Cachable
        .Value { expensiveOperation(incoming) }
        .cachingWhen { outputsOnceComplete in true }
}

// Caching Until
events.flatMap(cache: .disk(id: "foo")) { incoming in
    expensivePublisher(incoming)
        .cachingUntil { outputsOnceComplete in Date() + hours(1) }
}

// Caching When Operation Exceeds Duration
events.flatMap(cache: .disk(id: "foo")) { incoming in
    expensivePublisher(incoming)
        .cachingWhenExceeding(duration: seconds(1))
}

// Caching with Policy (for more granular control)
events.flatMap(cache: .memory()) { incoming in
    expensivePublisher(incoming)
        .cachingWithPolicy { (computeDuration, outputsOnceComplete) in
            myCondition || computeDuration > 10 
                ? Span.always 
                : Span.until(Date() + hours(1))
        }
}

// Replace Errors with Uncached
events.flatMap(cache: .disk(id: "foo")) { incoming in
    // Errors are not cached. Replacements are also not cached.
    expensivePublisher(incoming)
        .replacingErrorsWithUncached { error in Just(replacement) }
}

Installation

CombineCacheMap is available as a Swift Package and a Cocoapod.

Author

[email protected]

License

CombineCacheMap is available under the MIT license. See the LICENSE file for more info.

GitHub

link
Stars: 3
Last commit: 2 weeks ago
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