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Delegation pattern using Scala. Zero boilerplate code. Delegate all members | Delegate some of members
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| trait DatabaseOperations: | |
| def createDatabase(): Unit | |
| def manageDatabase(): Unit | |
| def maintainDatabase(): Unit | |
| class CloudProvider extends DatabaseOperations: | |
| def createDatabase(): Unit = | |
| println("Cloud Provider creates the database.") | |
| def manageDatabase(): Unit = | |
| println("Cloud Provider manages the database.") | |
| def maintainDatabase(): Unit = | |
| println("Cloud Provider maintains the database.") | |
| // ITEngineer class delegates DatabaseOperations to CloudProvider | |
| class ITEngineer(cloudProvider: CloudProvider) extends DatabaseOperations: | |
| export cloudProvider.* // Delegate all methods from CloudProvider | |
| def focusOnBusinessLogic(): Unit = | |
| println("Engineer focuses on business logic and data modeling.") | |
| @main def runDelegationExample(): Unit = | |
| val cloudProvider = new CloudProvider | |
| val engineer = new ITEngineer(cloudProvider) | |
| // Engineer delegates database tasks to the Cloud Provider | |
| engineer.createDatabase() | |
| engineer.manageDatabase() | |
| engineer.maintainDatabase() | |
| // And then Engineer does his main job | |
| engineer.focusOnBusinessLogic() |
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| trait DatabaseOperations: | |
| def createDatabase(): Unit | |
| def manageDatabase(): Unit | |
| def maintainDatabase(): Unit | |
| class CloudProvider extends DatabaseOperations: | |
| def createDatabase(): Unit = | |
| println("Cloud Provider creates the database.") | |
| def manageDatabase(): Unit = | |
| println("Cloud Provider manages the database.") | |
| def maintainDatabase(): Unit = | |
| println("Cloud Provider maintains the database.") | |
| // ITEngineer class delegates DatabaseOperations to CloudProvider | |
| class ITEngineer(cloudProvider: CloudProvider): | |
| export cloudProvider.manageDatabase // Delegate only one method from CloudProvider | |
| def focusOnBusinessLogic(): Unit = | |
| println("Engineer focuses on business logic and data modeling.") | |
| @main def runDelegationExample(): Unit = | |
| val cloudProvider = new CloudProvider | |
| val engineer = new ITEngineer(cloudProvider) | |
| // Engineer delegates database tasks to the Cloud Provider | |
| engineer.createDatabase() // compile error cause createDatabase is not delegated | |
| engineer.manageDatabase() | |
| engineer.maintainDatabase() // compile error cause maintainDatabase is not delegated | |
| // And Engineer does his main job | |
| engineer.focusOnBusinessLogic() |
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