云里雾里命令模式

还没搞明白，先把可以执行的代码扔上来

源代码https://github.com/domnikl/DesignPatternsPHP/blob/master/Behavioral/Command/README.rst

我做了一点调整，为了自己本地跑通。

 

代码结构

Command.php

Receiver.php

enableDate) {
            $str .= ' [' . date('Y-m-d') . ']';
        }
        echo "Receiver->write 
";
        $this->output[] = $str;
    }

    public function getOutput()
    {
        echo "Receiver->getOutput 
";
        return join("\n", $this->output);
    }

    /**
     * Enable receiver to display message date
     */
    public function enableDate()
    {
        echo "Receiver->enableDate 
";
        $this->enableDate = true;
    }

    /**
     * Disable receiver to display message date
     */
    public function disableDate()
    {
        echo "Receiver->disableDate 
";
        $this->enableDate = false;
    }
}

Invoker.php

setCommand 
";
        $this->command = $cmd;
    }
    /**
     * executes the command; the invoker is the same whatever is the command
     */
    public function run()
    {
        echo "Invoker->run 
";

        $this->command->execute();
    }
}

UndoableCommand.php

AddMessageDateCommand.php

__construct 
";
        $this->output = $console;
    }
    /**
     * Execute and make receiver to enable displaying messages date.
     */
    public function execute()
    {
        echo "AddMessageDateCommand->execute 
";
        // sometimes, there is no receiver and this is the command which
        // does all the work
        $this->output->enableDate();
    }
    /**
     * Undo the command and make receiver to disable displaying messages date.
     */
    public function undo()
    {
        echo "AddMessageDateCommand->undo 
";
        // sometimes, there is no receiver and this is the command which
        // does all the work
        $this->output->disableDate();
    }
}

HelloCommand.php

__construct 
";
        $this->output = $console;
    }
    /**
     * execute and output "Hello World".
     */
    public function execute()
    {
        echo "HelloCommand->execute 
";
        // sometimes, there is no receiver and this is the command which does all the work
        $this->output->write('Hello World');
    }
}

 

test.php

setCommand(new HelloCommand($receiver));
$invoker->run();
echo $receiver->getOutput();

输出结果

HelloCommand->__construct 
Invoker->setCommand 
Invoker->run 
HelloCommand->execute 
Receiver->write 
Receiver->getOutput 
Hello World