Abstract factory code examples of PHP design patterns (3)

Time:2021-3-4

objective

The advantage over the simple factory pattern is that you can create an object by subclassing it in different ways.

For a simple example, this abstract class might just be an interface.

This pattern is a “real” design pattern because it realizes the “dependency inversion” of “d” in the s.o.l.i.d principle.

This means that the factory method pattern depends on the abstract class, not the concrete class. This is an advantage over simple factory mode and static factory mode.

UML diagram

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code

  • Logger.php
  • StdoutLogger.php
  • FileLogger.php
filePath = $filePath;
    }
    public function log(string $message)
    {
        file_put_contents($this->filePath, $message . PHP_EOL, FILE_APPEND);
    }
}
  • LoggerFactory.php
  • StdoutLoggerFactory.php
  • FileLoggerFactory.php
filePath = $filePath;
    }
    public function createLogger(): Logger
    {
        return new FileLogger($this->filePath);
    }
}

test

  • Tests/FactoryMethodTest.php
createLogger();
        $this->assertInstanceOf(StdoutLogger::class, $logger);
    }
    public function testCanCreateFileLogging()
    {
        $loggerFactory = new FileLoggerFactory(sys_get_temp_dir());
        $logger = $loggerFactory->createLogger();
        $this->assertInstanceOf(FileLogger::class, $logger);
    }
}

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