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tome/content/node.166d5baa-74b2-498c-b2cf-a15ddf4df6a0.yml
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tome/content/node.166d5baa-74b2-498c-b2cf-a15ddf4df6a0.yml
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uuid:
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- value: 166d5baa-74b2-498c-b2cf-a15ddf4df6a0
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langcode:
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- value: en
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type:
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revision_timestamp:
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target_uuid: b8966985-d4b2-42a7-a319-2e94ccfbb849
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title:
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- value: |
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The Decorator design pattern
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created:
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- value: '2022-12-08T00:00:00+00:00'
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changed:
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path:
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- alias: /daily/2022/12/08/the-decorator-design-pattern
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langcode: en
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body:
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- value: |
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<p>Decorator is a structural design pattern that allows you to add extra functionality, such as if you want to add caching or logging to a service, without changing the original class.</p>
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<p>As long as a class implements an Interface, it can be decorated.</p>
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<p>For example, if I have this PHP interface:</p>
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<pre><code class="language-php">interface DoesSomething
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{
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public function doSomething(): void;
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}
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</code></pre>
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<p>I could have this class that does something:</p>
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<pre><code class="language-php">final class FirstClass implements DoesSomething
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{
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public function doSomething(): void
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{
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// Does something.
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}
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}
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</code></pre>
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<p>If I need to do something else, like caching or logging the result, I can decorate it.</p>
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<p>To do this, I need another class that implements the same interface and inject the original version.</p>
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<pre><code class="language-php">final class SecondClass implements DoesSomething
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{
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public function __constuct(
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private DoesSomething $originalClass
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) {}
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public function doSomething()
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{
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// Do something else before.
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$this->originalClass->doSomething();
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// Do something else afterwards.
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}
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}
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</code></pre>
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<p>Within the new class, the methods can be overridden, extra functionality can be added, and the original method can be run to execute the original functionality.</p>
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<p>As the two classes implement the same interface, I can swap between different versions and decorate multiple times if needed.</p>
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<p>This a pattern that I used recently to extend a service that retrieved some data from an API and saved it to a file, to change some arguments and do more work with it.</p>
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<p>The original class was unchanged, the new class was minimal and easy to understand as it only had a single responsibility, and if I needed to switch back to the original version, I could easily do that.</p>
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format: full_html
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processed: |
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<p>Decorator is a structural design pattern that allows you to add extra functionality, such as if you want to add caching or logging to a service, without changing the original class.</p>
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<p>As long as a class implements an Interface, it can be decorated.</p>
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<p>For example, if I have this PHP interface:</p>
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<pre><code class="language-php">interface DoesSomething
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{
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public function doSomething(): void;
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}
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</code></pre>
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<p>I could have this class that does something:</p>
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<pre><code class="language-php">final class FirstClass implements DoesSomething
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{
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public function doSomething(): void
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{
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// Does something.
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}
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}
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</code></pre>
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<p>If I need to do something else, like caching or logging the result, I can decorate it.</p>
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<p>To do this, I need another class that implements the same interface and inject the original version.</p>
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<pre><code class="language-php">final class SecondClass implements DoesSomething
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{
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public function __constuct(
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private DoesSomething $originalClass
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) {}
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public function doSomething()
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{
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// Do something else before.
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$this->originalClass->doSomething();
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// Do something else afterwards.
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}
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}
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</code></pre>
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<p>Within the new class, the methods can be overridden, extra functionality can be added, and the original method can be run to execute the original functionality.</p>
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<p>As the two classes implement the same interface, I can swap between different versions and decorate multiple times if needed.</p>
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<p>This a pattern that I used recently to extend a service that retrieved some data from an API and saved it to a file, to change some arguments and do more work with it.</p>
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|
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<p>The original class was unchanged, the new class was minimal and easy to understand as it only had a single responsibility, and if I needed to switch back to the original version, I could easily do that.</p>
|
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|
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summary: null
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field_daily_email_cta: { }
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