From d6fdd519c2ff1006d00a5f1951d7bc7829e346ee Mon Sep 17 00:00:00 2001
From: haerong22 <haerong22@naver.com>
Date: Sat, 18 Jun 2022 16:59:01 +0900
Subject: [PATCH] #11 spring batch: FlowJob api

---
 .../basic/flow/FlowJobConfiguration.java      | 76 +++++++++++++++++++
 .../basic/step/JobStepConfiguration.java      |  2 +-
 2 files changed, 77 insertions(+), 1 deletion(-)
 create mode 100644 spring-batch/basic/src/main/java/io/springbatch/basic/flow/FlowJobConfiguration.java

diff --git a/spring-batch/basic/src/main/java/io/springbatch/basic/flow/FlowJobConfiguration.java b/spring-batch/basic/src/main/java/io/springbatch/basic/flow/FlowJobConfiguration.java
new file mode 100644
index 00000000..2ffc810a
--- /dev/null
+++ b/spring-batch/basic/src/main/java/io/springbatch/basic/flow/FlowJobConfiguration.java
@@ -0,0 +1,76 @@
+package io.springbatch.basic.flow;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.batch.core.Job;
+import org.springframework.batch.core.Step;
+import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
+import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
+import org.springframework.batch.core.launch.support.RunIdIncrementer;
+import org.springframework.batch.repeat.RepeatStatus;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@RequiredArgsConstructor
+public class FlowJobConfiguration {
+
+    private final JobBuilderFactory jobBuilderFactory;
+    private final StepBuilderFactory stepBuilderFactory;
+
+    /*
+        FlowJob
+
+        - SimpleJob : 순차적 흐름 / FlowJob : 조건적 흐름
+        - Step 을 순차적으로만 구성하는 것이 아닌 특정한 상태에 따라 흐름을 전환하도록 구성
+            - Step 이 실패 하더라도 Job 은 실패로 끝나지 않도록 해야 하는 경우
+            - Step 이 성공 했을 때 다음에 실행해야 할 Step 을 구분해서 실행해야 하는 경우
+            - 특정 Step 은 전혀 실행되지 않게 구성해야 하는 경우
+        - Flow 와 Job 의 흐름을 구성하는데만 관여하고 실제 비즈니스 로직은 Step 에서 이루어진다.
+        - 내부적으로 SimpleFlow 객체를 포함하고 있으며 Job 실행 시 호출
+        - JobBuilderFactory -> JobBuilder -> JobFlowBuilder -> FlowBuilder -> FlowJob
+     */
+    @Bean
+    public Job batchJob() {
+        return jobBuilderFactory.get("batchJob")
+                .incrementer(new RunIdIncrementer())
+                .start(step1())
+                .on("COMPLETED")                // Step 의 실행 결과로 돌려받는 종료상태(ExitStatus) 를 캐치하여 매칭, TransitionBuilder 반환
+                .to(step3())                           // 다음으로 이동할 Step 지정
+                .from(step1())                         // 이전 단계에서 정의한 Step 의 Flow 를 추가적으로 정의
+                .on("FAILED")
+                .to(step2())                           // Step1 이 실패할 경우 Step2 실행
+                .end()                                 // build() 앞에 위치하면 FlowBuilder 를 종료하고 SimpleFlow 객체 생성
+                .build();                              // FlowJob 생성하고 flow 필드에 SimpleFlow 저장
+    }
+
+    @Bean
+    public Step step1() {
+        return stepBuilderFactory.get("step1")
+                .tasklet((contribution, chunkContext) -> {
+                    System.out.println("step1 was executed");
+                    throw new RuntimeException("step1 was failed");
+//                    return RepeatStatus.FINISHED;
+                })
+                .build();
+    }
+
+    @Bean
+    public Step step2() {
+        return stepBuilderFactory.get("step2")
+                .tasklet((contribution, chunkContext) -> {
+                    System.out.println("step2 was executed");
+                    return RepeatStatus.FINISHED;
+                })
+                .build();
+    }
+
+    @Bean
+    public Step step3() {
+        return stepBuilderFactory.get("step3")
+                .tasklet((contribution, chunkContext) -> {
+                    System.out.println("step3 was executed");
+                    return RepeatStatus.FINISHED;
+                })
+                .build();
+    }
+}
diff --git a/spring-batch/basic/src/main/java/io/springbatch/basic/step/JobStepConfiguration.java b/spring-batch/basic/src/main/java/io/springbatch/basic/step/JobStepConfiguration.java
index c3ce6b6b..d8ad3478 100644
--- a/spring-batch/basic/src/main/java/io/springbatch/basic/step/JobStepConfiguration.java
+++ b/spring-batch/basic/src/main/java/io/springbatch/basic/step/JobStepConfiguration.java
@@ -14,7 +14,7 @@ import org.springframework.batch.repeat.RepeatStatus;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
-@Configuration
+//@Configuration
 @RequiredArgsConstructor
 public class JobStepConfiguration {