Spring-фреймворк содержит огромное количество разных технологий, но в первую очередь он знаменит своим механизмом внедрения зависимостей (Dependency Injection, DI). Одним из самых популярных способов является внедрение с помощью аннотации @Autowired. Она может располагаться над конструктором бина (или класса конфигурации), его полем, сеттером или другим методом, принимающим в качестве аргумента другой бин. В перечисленных случаях, Spring во время создания контекста подставит нужный бин в отмеченные аннотацией места.
Большинство разработчиков знают, что за обработку аннотации @Autowired отвечает некий BeanPostProcessor, который и делает всю магию внедрения. И это действительно так. За исключением одного момента. BeanPostProcessor-ы взаимодействуют с уже созданными экземплярами бинов. Т. е. в случае, когда @Autowired расположена над конструктором, BeanPostProcessor не сработает т. к. бин еще не существует.
Далее мы попробуем разобраться, как происходит внедрение зависимостей. Для этого создадим простое Spring boot-приложение из 4-х классов.
// Бин, который будем внедрять через @Autowired над конструктором
@Component
public class DependencyForConstructorInjection {}
// Бин, который будем внедрять через @Autowired над полем
@Component
public class DependencyForFieldInjection {}
// Бин, в который будем внедрять зависимости
@Component
public class DependencyOwner {
@Autowired
private DependencyForFieldInjection dependencyForFieldInjection;
private final DependencyForConstructorInjection dependencyForConstructorInjection;
@Autowired
public DependencyOwner(DependencyForConstructorInjection dep) {
this.dependencyForConstructorInjection = dep;
}
@Override
public String toString() {
return "DependencyOwner{\n" +
"\tdependencyForFieldInjection=" + dependencyForFieldInjection +
", \n\tdependencyForConstructorInjection=" + dependencyForConstructorInjection +
"\n}";
}
}
// Запускающий класс, точка входа в приложение
@SpringBootApplication
public class AutowiredDemoApplication {
public static void main(String[] args) {
ConfigurableApplicationContext ctx = SpringApplication.run(AutowiredDemoApplication.class, args);
DependencyOwner dependencyOwner = ctx.getBean(DependencyOwner.class);
System.out.println(dependencyOwner);
}
}
Наше приложение содержит три бина, два из которых являются зависимостями третьего. Причем DependencyForFieldInjection внедряется через @Autowired, а DependencyForConstructorInjection внедряется через конструктор. В главном классе мы достаем бин, куда внедрены зависимости из контекста и печатаем его в консоль. В результате работы программы должно получиться примерно следующее:
DependencyOwner{
dependencyForFieldInjection=ru.otus.autowireddemo.components.DependencyForFieldInjection@6b5894c8,
dependencyForConstructorInjection=ru.otus.autowireddemo.components.DependencyForConstructorInjection@1433046b
}
Т. е. все бины успешно созданы и связаны друг с другом, как и ожидалось.
Можно приступать к исследованию
Для начала заглянем внутрь аннотации @Autowired, скачаем и прочитаем Javadoc. Там будет примерно следующее:
Note that actual injection is performed through a BeanPostProcessor which in turn means that you cannot use @Autowired to inject references into BeanPostProcessor or BeanFactoryPostProcessor types. Please consult the javadoc for the AutowiredAnnotationBeanPostProcessor class (which, by default, checks for the presence of this annotation)
Внедрение действительно происходит с помощью BeanPostProcessor-а, и это AutowiredAnnotationBeanPostProcessor. Перейдем к его описанию:
BeanPostProcessor implementation that autowires annotated fields, setter methods, and arbitrary config methods. Such members to be injected are detected through annotations: by default, Spring's @Autowired @Value annotations
Вроде то, что нужно. Обрабатывает аннотации @Autowired и @Value (по умолчанию еще может @Inject, если она есть в проекте), но, судя по всему, как и ожидалось, работает только для внедрения, через поля, сеттеры и аргументы методов конфигураций. Постпроцессор реализует множество методов разных интерфейсов, но уже даже по названию можно догадаться, что на роль метода, который внедрит нам значения в поле, подходит postProcessProperties. Вот его код:
@Override
public PropertyValues postProcessProperties(PropertyValues pvs, Object bean, String beanName) {
InjectionMetadata metadata = findAutowiringMetadata(beanName, bean.getClass(), pvs);
try {
metadata.inject(bean, beanName, pvs);
}
catch (BeanCreationException ex) {
throw ex;
}
catch (Throwable ex) {
throw new BeanCreationException(beanName, "Injection of autowired dependencies failed", ex);
}
return pvs;
}
В том, что мы угадали, несложно убедиться экспериментально. Поставим точку останова на строку metadata.inject(bean, beanName, pvs);. Зададим ей условие beanName.equals("dependencyOwner"), чтобы сработала только для интересующего нас бина. Запустим программу в режиме отладки. В итоге видим, что если до выполнения заданной строки переменная bean в поле dependencyForFieldInjection имела значение null, то после выполнения значение уже появилось. То же самое справедливо, если внедрение будет производиться через сеттер).
ОК. С этим все ясно, а что с конструкторами?
Среди содержимого AutowiredAnnotationBeanPostProcessor можно обнаружить любопытный метод determineCandidateConstructors, который очень похож на то, что могло бы определять конструктор(ы), необходимые для создания бина. Сам метод публичный, пришел из интерфейса SmartInstantiationAwareBeanPostProcessor и внутри класса не вызывается. Просто отдает наружу массив конструкторов:
public Constructor<?>[] determineCandidateConstructors(Class<?> beanClass, final String beanName)
Это значит, что его использует кто-то извне. Поставим точку останова с тем же условием, что и ранее, на последнюю строку метода, запустим приложение под отладчиком, дождемся, когда выполнение программы остановится на нашей точке, и сделаем шаг вперед. Мы оказались в методе determineConstructorsFromBeanPostProcessors, класса AbstractAutowireCapableBeanFactory:
protected Constructor<?>[] determineConstructorsFromBeanPostProcessors(@Nullable Class<?> beanClass, String beanName)
throws BeansException {
if (beanClass != null && hasInstantiationAwareBeanPostProcessors()) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof SmartInstantiationAwareBeanPostProcessor) {
SmartInstantiationAwareBeanPostProcessor ibp = (SmartInstantiationAwareBeanPostProcessor) bp;
Constructor<?>[] ctors = ibp.determineCandidateConstructors(beanClass, beanName);
if (ctors != null) {
return ctors;
}
}
}
}
return null;
}
По сути, BeanFactory перед созданием бина прогоняет все имеющиеся SmartInstantiationAwareBeanPostProcessor и вызывает у них determineCandidateConstructors, пока один из них не вернет массив конструкторов. Сам полученный массив используется в методе createBeanInstance того же класса для создания бина:
Constructor<?>[] ctors = determineConstructorsFromBeanPostProcessors(beanClass, beanName);
if (ctors != null || mbd.getResolvedAutowireMode() == AUTOWIRE_CONSTRUCTOR ||
mbd.hasConstructorArgumentValues() || !ObjectUtils.isEmpty(args)) {
return autowireConstructor(beanName, mbd, ctors, args);
}
Внутренности autowireConstructor(beanName, mbd, ctors, args) и есть конечная точка наших изысканий:
protected BeanWrapper autowireConstructor(String beanName, RootBeanDefinition mbd, @Nullable Constructor<?>[] ctors,
@Nullable Object[] explicitArgs) {
return new ConstructorResolver(this).autowireConstructor(beanName, mbd, ctors, explicitArgs);
}
Все вместе
Если дальше опускаться по стеку вызовов, можно составить полную картину происходящего.
- При создании контекста вызывается метод refresh класса AbstractApplicationContext.
- Внутри происходит вызов this.finishBeanFactoryInitialization(beanFactory);.
- Который, в свою очередь, вызывает beanFactory.preInstantiateSingletons();. (beanFactory = DefaultListableBeanFactory)
- DefaultListableBeanFactory вызывает цепочку методов предка (AbstractAutowireCapableBeanFactory):
- getBean ->
- doGetBean ->
- getSingleton ->
- createBean ->
- doCreateBean ->
- createBeanInstance.
- Что делает createBeanInstance, и что будет после него, мы уже знаем).
Итоги
Мы узнали, как происходит внедрение зависимостей для вариантов внедрения через конструктор и через поле/сеттер. Нужно отметить, что все бины в приложении были синглтонами. Для остальных скоупов местами процесс будет отличаться. Как минимум, будут работать другие участки кода). Если вы хотите продолжить изучение жизненного цикла бинов самостоятельно, рекомендуем обратить внимание на метод doCreateBean в классе AbstractAutowireCapableBeanFactory. Успехов!)
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<div class="post-info__author">Александр</div>
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<div class="post-info__time">21.10.20 в 15:11</div>
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<h1 class="blog__h1">Внедрение зависимостей в Spring. Погружение</h1>
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<a href="/nest/java/" class="post-info__blog" title="Java" >Java</a> →
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Теги: spring, внедрение зависимостей
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<p>Spring-фреймворк содержит огромное количество разных технологий, но в первую очередь он знаменит своим механизмом внедрения зависимостей (Dependency Injection, DI). Одним из самых популярных способов является внедрение с помощью аннотации <codeinline>@Autowired</codeinline>. <cut>Она может располагаться над конструктором бина (или класса конфигурации), его полем, сеттером или другим методом, принимающим в качестве аргумента другой бин. В перечисленных случаях, Spring во время создания контекста подставит нужный бин в отмеченные аннотацией места. </cut></p>
<p>Большинство разработчиков знают, что за обработку аннотации <codeinline>@Autowired</codeinline> отвечает некий <codeinline>BeanPostProcessor</codeinline>, который и делает всю магию внедрения. И это действительно так. За исключением одного момента. <codeinline>BeanPostProcessor</codeinline>-ы взаимодействуют с уже созданными экземплярами бинов. Т. е. в случае, когда <codeinline>@Autowired</codeinline> расположена над конструктором, <codeinline>BeanPostProcessor</codeinline> не сработает т. к. бин еще не существует. </p>
<p>Далее мы попробуем разобраться, как происходит внедрение зависимостей. Для этого создадим простое Spring boot-приложение из 4-х классов.</p>
<pre><div class="codehilite"><pre><span></span>// Бин, который будем внедрять через <span class="ni">@Autowired</span> над конструктором
<span class="ni">@Component</span>
public class DependencyForConstructorInjection {}
// Бин, который будем внедрять через <span class="ni">@Autowired</span> над полем
<span class="ni">@Component</span>
public class DependencyForFieldInjection {}
// Бин, в который будем внедрять зависимости
<span class="ni">@Component</span>
public class DependencyOwner {
<span class="ni">@Autowired</span>
private DependencyForFieldInjection dependencyForFieldInjection;
private final DependencyForConstructorInjection dependencyForConstructorInjection;
<span class="ni">@Autowired</span>
public DependencyOwner(DependencyForConstructorInjection dep) {
this.dependencyForConstructorInjection = dep;
}
<span class="ni">@Override</span>
public String toString() {
return "DependencyOwner{\n" +
"\tdependencyForFieldInjection=" + dependencyForFieldInjection +
", \n\tdependencyForConstructorInjection=" + dependencyForConstructorInjection +
"\n}";
}
}
// Запускающий класс, точка входа в приложение
<span class="ni">@SpringBootApplication</span>
public class AutowiredDemoApplication {
public static void main(String[] args) {
ConfigurableApplicationContext ctx = SpringApplication.run(AutowiredDemoApplication.class, args);
DependencyOwner dependencyOwner = ctx.getBean(DependencyOwner.class);
System.out.println(dependencyOwner);
}
}
</pre></div>
</pre>
<p>Наше приложение содержит три бина, два из которых являются зависимостями третьего. Причем <codeinline>DependencyForFieldInjection</codeinline> внедряется через <codeinline>@Autowired</codeinline>, а <codeinline>DependencyForConstructorInjection</codeinline> внедряется через конструктор. В главном классе мы достаем бин, куда внедрены зависимости из контекста и печатаем его в консоль. В результате работы программы должно получиться примерно следующее:</p>
<pre><div class="codehilite"><pre><span></span>DependencyOwner{
dependencyForFieldInjection=ru.otus.autowireddemo.components.DependencyForFieldInjection@6b5894c8,
dependencyForConstructorInjection=ru.otus.autowireddemo.components.DependencyForConstructorInjection@1433046b
}
</pre></div>
</pre>
<p>Т. е. все бины успешно созданы и связаны друг с другом, как и ожидалось. </p>
<h3>Можно приступать к исследованию</h3>
<p>Для начала заглянем внутрь аннотации <codeinline>@Autowired</codeinline>, скачаем и прочитаем Javadoc. Там будет примерно следующее:</p>
<blockquote>
<p>Note that actual injection is performed through a BeanPostProcessor which in turn means that you cannot use @Autowired to inject references into BeanPostProcessor or BeanFactoryPostProcessor types. Please consult the javadoc for the AutowiredAnnotationBeanPostProcessor class (which, by default, checks for the presence of this annotation)</p>
</blockquote>
<p>Внедрение действительно происходит с помощью <codeinline>BeanPostProcessor</codeinline>-а, и это <codeinline>AutowiredAnnotationBeanPostProcessor</codeinline>. Перейдем к его описанию:</p>
<blockquote>
<p>BeanPostProcessor implementation that autowires annotated fields, setter methods, and arbitrary config methods. Such members to be injected are detected through annotations: by default, Spring's @Autowired @Value annotations</p>
</blockquote>
<p>Вроде то, что нужно. Обрабатывает аннотации <codeinline>@Autowired</codeinline> и <codeinline>@Value</codeinline> (по умолчанию еще может <codeinline>@Inject</codeinline>, если она есть в проекте), но, судя по всему, как и ожидалось, работает только для внедрения, через поля, сеттеры и аргументы методов конфигураций. Постпроцессор реализует множество методов разных интерфейсов, но уже даже по названию можно догадаться, что на роль метода, который внедрит нам значения в поле, подходит <codeinline>postProcessProperties</codeinline>. Вот его код:</p>
<pre><div class="codehilite"><pre><span></span><span class="ni">@Override</span>
public PropertyValues postProcessProperties(PropertyValues pvs, Object bean, String beanName) {
InjectionMetadata metadata = findAutowiringMetadata(beanName, bean.getClass(), pvs);
try {
metadata.inject(bean, beanName, pvs);
}
catch (BeanCreationException ex) {
throw ex;
}
catch (Throwable ex) {
throw new BeanCreationException(beanName, "Injection of autowired dependencies failed", ex);
}
return pvs;
}
</pre></div>
</pre>
<p>В том, что мы угадали, несложно убедиться экспериментально. Поставим точку останова на строку <codeinline>metadata.inject(bean, beanName, pvs);</codeinline>. Зададим ей условие <codeinline>beanName.equals("dependencyOwner")</codeinline>, чтобы сработала только для интересующего нас бина. Запустим программу в режиме отладки. В итоге видим, что если до выполнения заданной строки переменная <codeinline>bean</codeinline> в поле <codeinline>dependencyForFieldInjection</codeinline> имела значение <codeinline>null</codeinline>, то после выполнения значение уже появилось. То же самое справедливо, если внедрение будет производиться через сеттер).</p>
<h3>ОК. С этим все ясно, а что с конструкторами?</h3>
<p>Среди содержимого <codeinline>AutowiredAnnotationBeanPostProcessor</codeinline> можно обнаружить любопытный метод <codeinline>determineCandidateConstructors</codeinline>, который очень похож на то, что могло бы определять конструктор(ы), необходимые для создания бина. Сам метод публичный, пришел из интерфейса <codeinline>SmartInstantiationAwareBeanPostProcessor</codeinline> и внутри класса не вызывается. Просто отдает наружу массив конструкторов:</p>
<pre><div class="codehilite"><pre><span></span>public Constructor<?>[] determineCandidateConstructors(Class<?> beanClass, final String beanName)
</pre></div>
</pre>
<p>Это значит, что его использует кто-то извне. Поставим точку останова с тем же условием, что и ранее, на последнюю строку метода, запустим приложение под отладчиком, дождемся, когда выполнение программы остановится на нашей точке, и сделаем шаг вперед. Мы оказались в методе <codeinline>determineConstructorsFromBeanPostProcessors</codeinline>, класса <codeinline>AbstractAutowireCapableBeanFactory</codeinline>:</p>
<pre><div class="codehilite"><pre><span></span>protected Constructor<?>[] determineConstructorsFromBeanPostProcessors(@Nullable Class<?> beanClass, String beanName)
throws BeansException {
if (beanClass != null && hasInstantiationAwareBeanPostProcessors()) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof SmartInstantiationAwareBeanPostProcessor) {
SmartInstantiationAwareBeanPostProcessor ibp = (SmartInstantiationAwareBeanPostProcessor) bp;
Constructor<?>[] ctors = ibp.determineCandidateConstructors(beanClass, beanName);
if (ctors != null) {
return ctors;
}
}
}
}
return null;
}
</pre></div>
</pre>
<p>По сути, <codeinline>BeanFactory</codeinline> перед созданием бина прогоняет все имеющиеся <codeinline>SmartInstantiationAwareBeanPostProcessor</codeinline> и вызывает у них <codeinline>determineCandidateConstructors</codeinline>, пока один из них не вернет массив конструкторов. Сам полученный массив используется в методе <codeinline>createBeanInstance</codeinline> того же класса для создания бина:</p>
<pre><div class="codehilite"><pre><span></span>Constructor<?>[] ctors = determineConstructorsFromBeanPostProcessors(beanClass, beanName);
if (ctors != null || mbd.getResolvedAutowireMode() == AUTOWIRE_CONSTRUCTOR ||
mbd.hasConstructorArgumentValues() || !ObjectUtils.isEmpty(args)) {
return autowireConstructor(beanName, mbd, ctors, args);
}
</pre></div>
</pre>
<p>Внутренности <codeinline>autowireConstructor(beanName, mbd, ctors, args)</codeinline> и есть конечная точка наших изысканий:</p>
<pre><div class="codehilite"><pre><span></span>protected BeanWrapper autowireConstructor(String beanName, RootBeanDefinition mbd, <span class="ni">@Nullable</span> Constructor<?>[] ctors,
<span class="ni">@Nullable</span> Object[] explicitArgs) {
return new ConstructorResolver(this).autowireConstructor(beanName, mbd, ctors, explicitArgs);
}
</pre></div>
</pre>
<h3>Все вместе</h3>
<p>Если дальше опускаться по стеку вызовов, можно составить полную картину происходящего.</p>
<ol>
<li>При создании контекста вызывается метод <codeinline>refresh</codeinline> класса <codeinline>AbstractApplicationContext</codeinline>.</li>
<li>Внутри происходит вызов <codeinline>this.finishBeanFactoryInitialization(beanFactory);</codeinline>.</li>
<li>Который, в свою очередь, вызывает <codeinline>beanFactory.preInstantiateSingletons();</codeinline>. (<codeinline>beanFactory</codeinline> = <codeinline>DefaultListableBeanFactory</codeinline>)</li>
<li><codeinline>DefaultListableBeanFactory</codeinline> вызывает цепочку методов предка (<codeinline>AbstractAutowireCapableBeanFactory</codeinline>): </li>
<li><codeinline>getBean -></codeinline> </li>
<li><codeinline>doGetBean -></codeinline> </li>
<li><codeinline>getSingleton -></codeinline></li>
<li><codeinline>createBean -></codeinline></li>
<li><codeinline>doCreateBean -></codeinline></li>
<li><codeinline>createBeanInstance</codeinline>.</li>
<li>Что делает <codeinline>createBeanInstance</codeinline>, и что будет после него, мы уже знаем).</li>
</ol>
<h3>Итоги</h3>
<p>Мы узнали, как происходит внедрение зависимостей для вариантов внедрения через конструктор и через поле/сеттер. Нужно отметить, что все бины в приложении были синглтонами. Для остальных скоупов местами процесс будет отличаться. Как минимум, будут работать другие участки кода). Если вы хотите продолжить изучение жизненного цикла бинов самостоятельно, рекомендуем обратить внимание на метод <codeinline>doCreateBean</codeinline> в классе <codeinline>AbstractAutowireCapableBeanFactory</codeinline>. Успехов!)</p>
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data-modal-hide-remove-class="hide-top,hide-transparent"
data-modal-hide-add-class="hide-transparent"
data-modal-loading="true"
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<form>
<p class="new-log-reg__popup-title">
Ваш телефон уже привязан к<br/>другой учетной записи
</p>
<p class="new-log-reg__popup-text">
Ваш телефон <b><nobr class="js-phone-duplicate-phone"></nobr></b> уже
привязан к учетной записи <b><nobr class="js-phone-duplicate-acc"></nobr></b>.
Выберите учетную запись, с которой желаете продолжить работу.
Мы привяжем к ней телефон.
</p>
<input class="js-dod-phone-dup-modal-phone" type="hidden" value="" name="phone">
<div class="dod-phone-dup-modal__loader-container">
<div class="js-loader-content">
<div class="new-input-line">
<button
class="new-button new-button_md new-button_full new-button_one-line
new-button_blue-inverse js-stats js-dod-phone-dup-modal-submit"
type="submit"
data-value="1"
data-event="Register;double_tel_ok"
>
Текущий аккаунт <nobr class="js-phone-duplicate-self-acc"></nobr>
</button>
</div>
<div class="new-input-line">
<button
class="new-button new-button_md new-button_full new-button_one-line
new-button_blue js-stats js-dod-phone-dup-modal-submit"
type="submit"
data-value="0"
data-event="Register;double_tel_ok"
>
Войти в аккаунт <nobr class="js-phone-duplicate-acc"></nobr>
</button>
</div>
<div class="new-input-line js-error hide">
<span class="new-input-line__error new-log-reg__popup-error js-error-text"></span>
</div>
</div>
<div
class="js-loader loader loader_absolute-center loader_md ic ic-loader"
style="display: none;"
></div>
</div>
</form>
</div>
</div>
</div>
<div class="modal-container hide" data-modal-id="teacher-enrollment">
<div class="modal-wrapper modal-wrapper_dark js-modal-wrapper" data-no-wrapper-close="true">
<div class="modal new-log-reg__popup">
<form class="new-log-reg__popup-body js-email-terms-update js-form-in-modal"
action="/teacher/request/"
data-modal="teacher-enrollment">
<div class="modal__close new-ic new-ic-close-inverse new-log-reg__popup-close js-close-modal"></div>
<div class="new-log-reg__popup-title">
Заполните номер телефона
</div>
<div class="new-log-reg__popup-text new-log-reg__popup-text_slim">
Для отправки заявки в преподаватели заполните номер телефона
</div>
<div class="new-input-line new-input-line_slim new-input-line_relative">
<input type="text"
class="new-input new-input_full js-placeholder js-input
js-required
"
maxlength="255"
name="phone"
autocomplete="off"
data-js-mask="phone"
required
placeholder="Телефон"
/>
<div class="new-input-error new-input-error_bottom js-validation-error hide "></div>
<div class="new-input-error new-input-error_info new-input-error_bottom hide"></div>
</div>
<div class="new-input-line js-error hide">
<span class="new-input-line__error new-log-reg__popup-error js-text"></span>
</div>
<div class="new-input-line">
<button class="new-button new-button_md new-button_full new-button_blue"
type="submit">Отправить
</button>
</div>
</form>
</div>
</div>
</div>
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