DIP_example

dipExample.swift

import Foundation


// 1. 적용 X
/*
class Handler {

    let fm = FilesystemManager()

    func handle(string: String) {
        fm.save(string: string)
    }
}

class FilesystemManager {

    func save(string: String) {
        // Open a file
        // Save the string in this file
        // Close the file
    }
}
*/

// 2. DIP적용
class Handler {
 
    let storage: Storage
 
    init(storage: Storage) {
        self.storage = storage
    }
 
    func handle(string: String) {
        storage.save(string: string)
    }
}
 
protocol Storage {
 
   func save(string: String)
}
 
class FilesystemManager: Storage {
 
    func save(string: String) {
        // Open a file in read-mode
        // Save the string in this file
        // Close the file
    }
}
 
class DatabaseManager: Storage {
 
    func save(string: String) {
        // Connect to the database
        // Execute the query to save the string in a table
        // Close the connection
    }
}





//테스팅

/*
 class StubStorage: Storage {

     var isSavedCalled = false

     func save(string: String) {
         isSavedCalled = true
    }
 }

 class HandlerTests {

 func test_Handle_IsSaveCalled() {
 let handler = Handler()
 let stubStorage = StubStorage()

 handler.handle(string: "test", storage: stubStorage)

 XCTAssertTrue(stubStorage.isSavedCalled)
 }
 }

*/