add context refreshed event sample

ipipman · ipipman · commit 269f19072f8b · 2021-09-21T18:24:56.000+08:00
diff --git a/springboot-source-code-analysis/(5)监听器设计模式.md b/springboot-source-code-analysis/(5)监听器设计模式.md
@@ -4,6 +4,8 @@
 
 <img src="https://tva1.sinaimg.cn/large/008i3skNly1gt3lkgk29nj31l60l0ju9.jpg" alt="image-20210803144505140" align="left" width="800" />
 
+
+
 - 系统消息由广播器（Multicaster）发布出去，发布的内容统称为事件（Event），对关键事件产生订阅的是监听器（Listener）；
 
 
diff --git a/springboot-source-code-analysis/pom.xml b/springboot-source-code-analysis/pom.xml
@@ -30,6 +30,12 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/listener/ApplicationContextContainer.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/listener/ApplicationContextContainer.java
@@ -0,0 +1,45 @@
+package com.example.springboot.source.code.analysis.listener;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationListener;
+import org.springframework.context.event.ContextRefreshedEvent;
+import org.springframework.core.annotation.Order;
+import org.springframework.lang.Nullable;
+import org.springframework.stereotype.Component;
+
+/**
+ * Created by ipipman on 2021/9/21.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.listener
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021/9/21 5:49 下午
+ */
+@Component
+@Order(1)
+public class ApplicationContextContainer implements ApplicationListener<ContextRefreshedEvent> {
+
+    private ApplicationContext applicationContext;
+
+    private static ApplicationContextContainer applicationContextContainer;
+
+    @Override
+    public void onApplicationEvent(@Nullable ContextRefreshedEvent event) {
+        if (event != null && applicationContext == null) {
+            synchronized (ApplicationContextContainer.class) {
+                if (applicationContext == null) {
+                    applicationContext = event.getApplicationContext();
+                }
+            }
+        }
+        applicationContextContainer = this;
+    }
+
+    public static ApplicationContextContainer getInstance() {
+        return applicationContextContainer;
+    }
+
+    public <T> T getBean(Class<T> clazz) {
+        return applicationContext.getBean(clazz);
+    }
+}
diff --git a/springboot-source-code-analysis/src/test/java/com/example/springboot/source/code/analysis/SpringbootSourceCodeAnalysisApplicationTests.java b/springboot-source-code-analysis/src/test/java/com/example/springboot/source/code/analysis/SpringbootSourceCodeAnalysisApplicationTests.java
@@ -2,27 +2,40 @@
 
 import com.example.springboot.source.code.analysis.event.RainListener;
 import com.example.springboot.source.code.analysis.event.WeatherRunListener;
+import com.example.springboot.source.code.analysis.listener.ApplicationContextContainer;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
-@SpringBootTest
-class SpringbootSourceCodeAnalysisApplicationTests {
+@SpringBootTest(classes = SpringbootSourceCodeAnalysisApplication.class)
+@RunWith(SpringJUnit4ClassRunner.class)
+public class SpringbootSourceCodeAnalysisApplicationTests {
 
     // 引入事件监听器
     @Autowired
     private WeatherRunListener weatherRunListener;
 
     // 测试事件监听器
     @Test
-    public void testEvent(){
+    public void testEvent() {
         weatherRunListener.addListener(new RainListener());
         weatherRunListener.snow();
         weatherRunListener.rain();
     }
 
+    // 测试ContextRefreshEvent事件
     @Test
-    void contextLoads() {
+    public void testContextRefreshEvent() {
+        WeatherRunListener weatherRunListener = ApplicationContextContainer.getInstance().getBean(WeatherRunListener.class);
+        weatherRunListener.snow();
+        weatherRunListener.rain();
+    }
+
+
+    @Test
+    public void contextLoads() {
     }
 
 
