Merge pull request #59 from mgooty/master

Added example code for usage and configuration of @Scheduled annotation.

spring-all/pom.xml

@@ -118,7 +118,6 @@
             <version>${mockito.version}</version>
             <scope>test</scope>
         </dependency>
-
     </dependencies>
 
     <build>

spring-all/src/main/java/org/baeldung/scheduling/ScheduledAnnotationExample.java

@@ -0,0 +1,52 @@
+package org.baeldung.scheduling;
+
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+@Component
+public class ScheduledAnnotationExample {
+
+    @Scheduled(fixedDelay = 1000)
+    public void scheduleFixedDelayTask() {
+        System.out.println("Fixed delay task - " + System.currentTimeMillis() / 1000);
+    }
+
+    @Scheduled(fixedDelayString = "${fixedDelay.in.milliseconds}")
+    public void scheduleFixedDelayTaskUsingExpression() {
+        System.out.println("Fixed delay task - " + System.currentTimeMillis() / 1000);
+    }
+
+    @Scheduled(fixedDelay = 1000, initialDelay = 2000)
+    public void scheduleFixedDelayWithInitialDelayTask() {
+        System.out.println("Fixed delay task with one second initial delay - " + System.currentTimeMillis() / 1000);
+    }
+
+    @Scheduled(fixedRate = 1000)
+    public void scheduleFixedRateTask() {
+        System.out.println("Fixed rate task - " + System.currentTimeMillis() / 1000);
+    }
+
+    @Scheduled(fixedRateString = "${fixedRate.in.milliseconds}")
+    public void scheduleFixedRateTaskUsingExpression() {
+        System.out.println("Fixed rate task - " + System.currentTimeMillis() / 1000);
+    }
+
+    @Scheduled(fixedDelay = 1000, initialDelay = 100)
+    public void scheduleFixedRateWithInitialDelayTask() {
+        System.out.println("Fixed delay task with one second initial delay - " + System.currentTimeMillis() / 1000);
+    }
+
+    /**
+     * Scheduled task is executed at 10:15 AM on the 15th day of every month
+     */
+    @Scheduled(cron = "0 15 10 15 * ?")
+    public void scheduleTaskUsingCronExpression() {
+        System.out.println("schedule tasks using cron expressions - " + System.currentTimeMillis() / 1000);
+    }
+
+    @Scheduled(cron = "${cron.expression}")
+    public void scheduleTaskUsingExternalizedCronExpression() {
+        System.out.println("schedule tasks using externalized cron expressions - " + System.currentTimeMillis() / 1000);
+    }
+
+}

spring-all/src/main/java/org/baeldung/scheduling/SpringSchedulingConfig.java

@@ -0,0 +1,20 @@
+package org.baeldung.scheduling;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
+import org.springframework.scheduling.annotation.EnableScheduling;
+
+@Configuration
+@EnableScheduling
+@ComponentScan("com.baeldung.spring.integration")
+@PropertySource("classpath:springIntegration.properties")
+public class SpringSchedulingConfig {
+
+    @Bean
+    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
+        return new PropertySourcesPlaceholderConfigurer();
+    }
+}

spring-all/src/main/resources/springScheduled-config.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:task="http://www.springframework.org/schema/task" xmlns:context="http://www.springframework.org/schema/context"
+	xsi:schemaLocation="http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.1.xsd
+		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">
+
+	<!-- Configure the scheduler -->
+	<task:scheduler id="myScheduler" pool-size="10" />
+
+	<bean id="myscheduler" name="myscheduler"
+		class="org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler">
+	</bean>
+
+	<!-- Configure the fixedDealy, fixedRate or cron based schduled tasks -->
+	<task:scheduled-tasks scheduler="myScheduler">
+		<task:scheduled ref="beanA" method="methodA" fixed-delay="5000" initial-delay="1000" />
+		<task:scheduled ref="beanB" method="methodB" fixed-rate="5000" />
+		<task:scheduled ref="beanC" method="methodC" cron="*/5 * * * * MON-FRI" />
+	</task:scheduled-tasks>
+</beans>

spring-all/src/main/resources/springScheduled.properties

@@ -0,0 +1,3 @@
+cron.expression=0 15 10 15 * ?
+fixedRate.in.millisecons=1000
+fixedDelay.in.millisecons=1000

spring-all/src/test/java/org/baeldung/scheduling/ScheduledAnnotationExampleTest.java

@@ -0,0 +1,18 @@
+package org.baeldung.scheduling;
+
+import org.baeldung.scheduling.SpringSchedulingConfig;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.support.AnnotationConfigContextLoader;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = { SpringSchedulingConfig.class }, loader = AnnotationConfigContextLoader.class)
+public class ScheduledAnnotationExampleTest {
+
+    @Test
+    public void testScheduledAnnotation() throws InterruptedException {
+        Thread.sleep(20000);
+    }
+}