Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
| 1 | <?php namespace RayEmitter\Example\BankAccount; |
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| 6 | final class Aggregate extends AbstractAggregate |
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| 7 | { |
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| 8 | /** |
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| 9 | * Minimum needed to open an account. |
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| 10 | * @var int|float |
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| 11 | */ |
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| 12 | const MINIMUM_TO_OPEN = 50; |
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| 13 | |||
| 14 | /** |
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| 15 | * Account Was Created Event Handle |
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| 16 | * |
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| 17 | * @param AccountWasCreated $event Event Object |
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| 18 | * @return void |
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| 19 | */ |
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| 20 | protected function applyAccountWasCreated(AccountWasCreated $event) |
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| 28 | |||
| 29 | /** |
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| 30 | * Money Deposited Event Handle |
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| 31 | * |
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| 32 | * @param MoneyDeposited $event Event Object |
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| 33 | * @return void |
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| 34 | */ |
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| 35 | View Code Duplication | protected function applyMoneyDeposited(MoneyDeposited $event) |
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| 42 | |||
| 43 | /** |
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| 44 | * Money Withdrawn Event Handle |
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| 45 | * |
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| 46 | * @param MoneyWithdrawn $event Event Object |
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| 47 | * @return void |
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| 48 | */ |
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| 49 | View Code Duplication | protected function applyMoneyWithdrawn(MoneyWithdrawn $event) |
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| 56 | |||
| 57 | /** |
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| 58 | * Create Account Command Handle |
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| 59 | * |
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| 60 | * Processes business logic for the account creation command. |
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| 61 | * @param CreateAccount $command Command object. |
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| 62 | * @return AccountWasCreated Event object. |
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| 63 | */ |
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| 64 | protected function handleCreateAccount(CreateAccount $command) |
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| 78 | |||
| 79 | /** |
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| 80 | * Deposit Money Command Handle |
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| 81 | * |
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| 82 | * Processes business logic for the deposit money command. |
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| 83 | * @param DepositMoney $command Command object. |
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| 84 | * @return MoneyDeposited Event object. |
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| 85 | */ |
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| 86 | protected function handleDepositMoney(DepositMoney $command) |
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| 99 | |||
| 100 | /** |
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| 101 | * Withdraw Money Command Handle |
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| 102 | * |
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| 103 | * Processes business logic for the withdraw money command. |
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| 104 | * @param WithdrawMoney $command Command object. |
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| 105 | * @return MoneyWithdrawn Event object. |
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| 106 | */ |
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| 107 | protected function handleWithdrawMoney(WithdrawMoney $command) |
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| 124 | } |
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| 125 |
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..