76 lines
2.1 KiB
Swift
76 lines
2.1 KiB
Swift
//
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// Copyright Amazon.com Inc. or its affiliates.
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// All Rights Reserved.
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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import Foundation
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import os.log
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struct LoggingStateMachineResolver<Resolver: StateMachineResolver>: StateMachineResolver {
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typealias StateType = Resolver.StateType
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private let wrappedResolver: Resolver
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private let logger: OSLog
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private let logType: OSLogType
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static func makeDefaultLogger() -> OSLog {
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OSLog(subsystem: "StateMachineResolver", category: String(describing: StateType.self))
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}
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init(
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resolver: Resolver,
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logger: OSLog? = nil,
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level: OSLogType = .debug
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) {
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self.wrappedResolver = resolver
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self.logger = logger ?? LoggingStateMachineResolver.makeDefaultLogger()
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self.logType = level
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}
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var defaultState: StateType {
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wrappedResolver.defaultState
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}
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func resolve(
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oldState: StateType,
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byApplying event: StateMachineEvent
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) -> StateResolution<StateType> {
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let resolution = wrappedResolver.resolve(oldState: oldState, byApplying: event)
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os_log(logType, log: logger, .oldState, String(describing: oldState))
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os_log(logType, log: logger, .event, String(describing: event))
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os_log(logType, log: logger, .resolution, String(describing: resolution))
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return resolution
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}
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}
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extension StateMachineResolver {
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func logging(
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logger: OSLog? = nil,
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level: OSLogType = .debug
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) -> LoggingStateMachineResolver<Self> {
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LoggingStateMachineResolver(
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resolver: self,
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logger: logger,
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level: level
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)
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}
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}
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private extension StaticString {
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#if DEBUG
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static let oldState: StaticString = "old state: %{public}@"
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static let event: StaticString = "event: %{public}@"
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static let resolution: StaticString = "resolution: %{public}@"
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#else
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static let oldState: StaticString = "old state: %{private}@"
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static let event: StaticString = "event: %{private}@"
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static let resolution: StaticString = "resolution: %{private}@"
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#endif
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}
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