From 0da637d1f970c9ef5c3c6cf4f217ad5922bb3d49 Mon Sep 17 00:00:00 2001
From: Tino M Thomas <tinoymthms@gmail.com>
Date: Wed, 13 Jun 2018 22:51:53 +0300
Subject: [PATCH] Spring shutdown callback methodologies - BAEL 1831

---
 .../ShutdownHookApplication.java              | 14 +++++++++++
 .../baeldung/shutdownhooks/beans/Bean1.java   | 14 +++++++++++
 .../baeldung/shutdownhooks/beans/Bean2.java   | 14 +++++++++++
 .../baeldung/shutdownhooks/beans/Bean3.java   |  8 ++++++
 .../config/ExampleServletContextListener.java | 18 +++++++++++++
 .../config/ShutdownHookConfiguration.java     | 25 +++++++++++++++++++
 6 files changed, 93 insertions(+)
 create mode 100644 spring-boot/src/main/java/com/baeldung/shutdownhooks/ShutdownHookApplication.java
 create mode 100644 spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean1.java
 create mode 100644 spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean2.java
 create mode 100644 spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean3.java
 create mode 100644 spring-boot/src/main/java/com/baeldung/shutdownhooks/config/ExampleServletContextListener.java
 create mode 100644 spring-boot/src/main/java/com/baeldung/shutdownhooks/config/ShutdownHookConfiguration.java

diff --git a/spring-boot/src/main/java/com/baeldung/shutdownhooks/ShutdownHookApplication.java b/spring-boot/src/main/java/com/baeldung/shutdownhooks/ShutdownHookApplication.java
new file mode 100644
index 0000000000..7cce34a06c
--- /dev/null
+++ b/spring-boot/src/main/java/com/baeldung/shutdownhooks/ShutdownHookApplication.java
@@ -0,0 +1,14 @@
+package com.baeldung.shutdownhooks;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+@EnableAutoConfiguration
+public class ShutdownHookApplication {
+
+    public static void main(String args[]) {
+        SpringApplication.run(ShutdownHookApplication.class, args);
+    }
+}
diff --git a/spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean1.java b/spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean1.java
new file mode 100644
index 0000000000..e85b9395d3
--- /dev/null
+++ b/spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean1.java
@@ -0,0 +1,14 @@
+package com.baeldung.shutdownhooks.beans;
+
+import javax.annotation.PreDestroy;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class Bean1 {
+
+    @PreDestroy
+    public void destroy() {
+        System.out.println("Shutdown triggered using @PreDestroy.");
+    }
+}
diff --git a/spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean2.java b/spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean2.java
new file mode 100644
index 0000000000..e85d12e791
--- /dev/null
+++ b/spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean2.java
@@ -0,0 +1,14 @@
+package com.baeldung.shutdownhooks.beans;
+
+import org.springframework.beans.factory.DisposableBean;
+import org.springframework.stereotype.Component;
+
+@Component
+public class Bean2 implements DisposableBean {
+
+    @Override
+    public void destroy() throws Exception {
+        System.out.println("Shutdown triggered using DisposableBean.");
+    }
+
+}
diff --git a/spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean3.java b/spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean3.java
new file mode 100644
index 0000000000..bed1d50ee7
--- /dev/null
+++ b/spring-boot/src/main/java/com/baeldung/shutdownhooks/beans/Bean3.java
@@ -0,0 +1,8 @@
+package com.baeldung.shutdownhooks.beans;
+
+public class Bean3 {
+
+    public void destroy() {
+        System.out.println("Shutdown triggered using bean destroy method.");
+    }
+}
diff --git a/spring-boot/src/main/java/com/baeldung/shutdownhooks/config/ExampleServletContextListener.java b/spring-boot/src/main/java/com/baeldung/shutdownhooks/config/ExampleServletContextListener.java
new file mode 100644
index 0000000000..07d729cb83
--- /dev/null
+++ b/spring-boot/src/main/java/com/baeldung/shutdownhooks/config/ExampleServletContextListener.java
@@ -0,0 +1,18 @@
+package com.baeldung.shutdownhooks.config;
+
+import javax.servlet.ServletContextEvent;
+import javax.servlet.ServletContextListener;
+
+public class ExampleServletContextListener implements ServletContextListener {
+
+    @Override
+    public void contextDestroyed(ServletContextEvent event) {
+        System.out.println("Shutdown triggered using ServletContextListener.");
+    }
+
+    @Override
+    public void contextInitialized(ServletContextEvent event) {
+        // Triggers when context initializes
+    }
+
+}
diff --git a/spring-boot/src/main/java/com/baeldung/shutdownhooks/config/ShutdownHookConfiguration.java b/spring-boot/src/main/java/com/baeldung/shutdownhooks/config/ShutdownHookConfiguration.java
new file mode 100644
index 0000000000..2d0712e19b
--- /dev/null
+++ b/spring-boot/src/main/java/com/baeldung/shutdownhooks/config/ShutdownHookConfiguration.java
@@ -0,0 +1,25 @@
+package com.baeldung.shutdownhooks.config;
+
+import javax.servlet.ServletContextListener;
+
+import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import com.baeldung.shutdownhooks.beans.Bean3;
+
+@Configuration
+public class ShutdownHookConfiguration {
+
+    @Bean(destroyMethod = "destroy")
+    public Bean3 initializeBean3() {
+        return new Bean3();
+    }
+
+    @Bean
+    ServletListenerRegistrationBean<ServletContextListener> servletListener() {
+        ServletListenerRegistrationBean<ServletContextListener> srb = new ServletListenerRegistrationBean<>();
+        srb.setListener(new ExampleServletContextListener());
+        return srb;
+    }
+}