Add recover method to JobOperator

Resolves #4876

Signed-off-by: Yejeong, Ham <dev@thelightway.kr>

Author: thelightway24

spring-batch-core/src/main/java/org/springframework/batch/core/launch/JobOperator.java

@@ -39,6 +39,7 @@
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
+ * @author Yejeong Ham
  * @since 2.0
  */
 @SuppressWarnings("removal")
@@ -248,6 +249,18 @@ JobExecution startNextInstance(Job job) throws JobRestartException, JobExecution
 	 */
 	JobExecution abandon(JobExecution jobExecution) throws JobExecutionAlreadyRunningException;
 
+	/**
+	 * Marks the given {@link JobExecution} as {@code FAILED} when it is stuck in a
+	 * {@code STARTED} state due to an abrupt shutdown or failure, in order to make it
+	 * restartable. This operation makes a previously non-restartable execution eligible
+	 * for restart by updating its execution context with the flag {@code recovered=true}.
+	 * @param jobExecution the {@link JobExecution} to recover
+	 * @return the {@link JobExecution} after it has been marked as recovered
+	 * @throws UnexpectedJobExecutionException if the job execution is already complete or
+	 * abandoned
+	 */
+	JobExecution recover(JobExecution jobExecution);
+
 	/**
 	 * List the {@link JobExecution JobExecutions} associated with a particular
 	 * {@link JobInstance}, in reverse order of creation (and therefore usually of

spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/CommandLineJobOperator.java

@@ -49,6 +49,7 @@
  * {@link #main(String[])} method explains the various operations and exit codes.
  *
  * @author Mahmoud Ben Hassine
+ * @author Yejeong Ham
  * @since 6.0
  */
 public class CommandLineJobOperator {
@@ -204,6 +205,29 @@ public int abandon(long jobExecutionId) {
 		}
 	}
 
+	/**
+	 * Recover the job execution with the given ID that is stuck in a {@code STARTED}
+	 * state due to an abrupt shutdown or failure, making it eligible for restart.
+	 * @param jobExecutionId the ID of the job execution to recover
+	 * @return the exit code of the recovered job execution, or JVM_EXITCODE_GENERIC_ERROR
+	 * if an error occurs
+	 */
+	public int recover(long jobExecutionId) {
+		logger.info(() -> "Recovering job execution with ID: " + jobExecutionId);
+		try {
+			JobExecution jobExecution = this.jobRepository.getJobExecution(jobExecutionId);
+			if (jobExecution == null) {
+				logger.error(() -> "No job execution found with ID: " + jobExecutionId);
+				return JVM_EXITCODE_GENERIC_ERROR;
+			}
+			JobExecution recoveredExecution = this.jobOperator.recover(jobExecution);
+			return this.exitCodeMapper.intValue(recoveredExecution.getExitStatus().getExitCode());
+		}
+		catch (Exception e) {
+			return JVM_EXITCODE_GENERIC_ERROR;
+		}
+	}
+
 	/*
 	 * Main method to operate jobs from the command line.
 	 *
@@ -287,6 +311,10 @@ public static void main(String[] args) {
 				jobExecutionId = Long.parseLong(args[2]);
 				exitCode = operator.abandon(jobExecutionId);
 				break;
+			case "recover":
+				jobExecutionId = Long.parseLong(args[2]);
+				exitCode = operator.recover(jobExecutionId);
+				break;
 			default:
 				System.err.println("Unknown operation: " + operation);
 				exitCode = JVM_EXITCODE_GENERIC_ERROR;

spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/SimpleJobOperator.java

@@ -80,6 +80,7 @@
  * @author Will Schipp
  * @author Mahmoud Ben Hassine
  * @author Andrey Litvitski
+ * @author Yejeong Ham
  * @since 2.0
  * @deprecated since 6.0 in favor of {@link TaskExecutorJobOperator}. Scheduled for
  * removal in 6.2 or later.
@@ -391,6 +392,45 @@ public JobExecution abandon(JobExecution jobExecution) throws JobExecutionAlread
 		return jobExecution;
 	}
 
+	@Override
+	public JobExecution recover(JobExecution jobExecution) {
+		Assert.notNull(jobExecution, "JobExecution must not be null");
+
+		if (jobExecution.getExecutionContext().containsKey("recovered")) {
+			if (logger.isInfoEnabled()) {
+				logger.info("already recovered job execution: " + jobExecution);
+			}
+			throw new UnexpectedJobExecutionException("JobExecution is already recovered");
+		}
+
+		BatchStatus jobStatus = jobExecution.getStatus();
+		if (jobStatus == BatchStatus.COMPLETED || jobStatus == BatchStatus.ABANDONED) {
+			throw new UnexpectedJobExecutionException(
+					"JobExecution is already complete or abandoned and therefore cannot be recovered: " + jobExecution);
+		}
+
+		if (logger.isInfoEnabled()) {
+			logger.info("Recovering job execution: " + jobExecution);
+		}
+
+		for (StepExecution stepExecution : jobExecution.getStepExecutions()) {
+			BatchStatus stepStatus = stepExecution.getStatus();
+			if (stepStatus.isRunning() || stepStatus == BatchStatus.STOPPING) {
+				stepExecution.setStatus(BatchStatus.FAILED);
+				stepExecution.setEndTime(LocalDateTime.now());
+				stepExecution.getExecutionContext().put("recovered", true);
+				jobRepository.update(stepExecution);
+			}
+		}
+
+		jobExecution.setStatus(BatchStatus.FAILED);
+		jobExecution.setEndTime(LocalDateTime.now());
+		jobExecution.getExecutionContext().put("recovered", true);
+		jobRepository.update(jobExecution);
+
+		return jobExecution;
+	}
+
 	@Override
 	@Deprecated(since = "6.0", forRemoval = true)
 	public Set<String> getJobNames() {

spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/TaskExecutorJobOperator.java

@@ -51,6 +51,7 @@
  * @author Lucas Ward
  * @author Will Schipp
  * @author Mahmoud Ben Hassine
+ * @author Yejeong Ham
  * @since 6.0
  */
 @SuppressWarnings("removal")
@@ -119,4 +120,10 @@ public JobExecution abandon(JobExecution jobExecution) throws JobExecutionAlread
 		return super.abandon(jobExecution);
 	}
 
+	@Override
+	public JobExecution recover(JobExecution jobExecution) {
+		Assert.notNull(jobExecution, "JobExecution must not be null");
+		return super.recover(jobExecution);
+	}
+
 }

spring-batch-core/src/test/java/org/springframework/batch/core/launch/support/CommandLineJobOperatorTests.java

@@ -35,6 +35,7 @@
  * Tests for {@link CommandLineJobOperator}.
  *
  * @author Mahmoud Ben Hassine
+ * @author Yejeong Ham
  */
 class CommandLineJobOperatorTests {
 
@@ -133,4 +134,18 @@ void abandon() throws Exception {
 		Mockito.verify(jobOperator).abandon(jobExecution);
 	}
 
+	@Test
+	void recover() {
+		// given
+		long jobExecutionId = 1;
+		JobExecution jobExecution = mock();
+
+		// when
+		Mockito.when(jobRepository.getJobExecution(jobExecutionId)).thenReturn(jobExecution);
+		this.commandLineJobOperator.recover(jobExecutionId);
+
+		// then
+		Mockito.verify(jobOperator).recover(jobExecution);
+	}
+
 }

spring-batch-core/src/test/java/org/springframework/batch/core/launch/support/TaskExecutorJobOperatorTests.java

@@ -32,6 +32,7 @@
 import org.springframework.batch.core.job.JobExecution;
 import org.springframework.batch.core.job.JobExecutionException;
 import org.springframework.batch.core.job.JobInstance;
+import org.springframework.batch.core.job.UnexpectedJobExecutionException;
 import org.springframework.batch.core.job.parameters.JobParameters;
 import org.springframework.batch.core.job.parameters.JobParametersIncrementer;
 import org.springframework.batch.core.step.Step;
@@ -69,7 +70,7 @@
  * @author Will Schipp
  * @author Mahmoud Ben Hassine
  * @author Jinwoo Bae
- *
+ * @author Yejeong Ham
  */
 @SuppressWarnings("removal")
 class TaskExecutorJobOperatorTests {
@@ -427,6 +428,52 @@ void testAbortNonStopping() {
 		assertThrows(JobExecutionAlreadyRunningException.class, () -> jobOperator.abandon(123L));
 	}
 
+	@Test
+	void testRecover() {
+		JobInstance jobInstance = new JobInstance(123L, job.getName());
+		JobExecution jobExecution = new JobExecution(jobInstance, 111L, jobParameters);
+		jobExecution.setStatus(BatchStatus.STARTED);
+		jobExecution.createStepExecution("step1").setStatus(BatchStatus.STARTED);
+		when(jobRepository.getJobExecution(111L)).thenReturn(jobExecution);
+		when(jobRepository.getLastJobExecution(jobInstance)).thenReturn(jobExecution);
+		JobExecution recover = jobOperator.recover(jobExecution);
+		assertEquals(BatchStatus.FAILED, recover.getStatus());
+		assertTrue(recover.getExecutionContext().containsKey("recovered"));
+	}
+
+	@Test
+	void testRecoverStepStopping() {
+		JobInstance jobInstance = new JobInstance(123L, job.getName());
+		JobExecution jobExecution = new JobExecution(jobInstance, 111L, jobParameters);
+		jobExecution.setStatus(BatchStatus.STARTED);
+		jobExecution.createStepExecution("step1").setStatus(BatchStatus.STOPPING);
+		when(jobRepository.getJobExecution(111L)).thenReturn(jobExecution);
+		when(jobRepository.getLastJobExecution(jobInstance)).thenReturn(jobExecution);
+		JobExecution recover = jobOperator.recover(jobExecution);
+		assertEquals(BatchStatus.FAILED, recover.getStatus());
+		assertTrue(recover.getExecutionContext().containsKey("recovered"));
+	}
+
+	@Test
+	void testRecoverJobAbandon() {
+		JobInstance jobInstance = new JobInstance(123L, job.getName());
+		JobExecution jobExecution = new JobExecution(jobInstance, 111L, jobParameters);
+		jobExecution.setStatus(BatchStatus.ABANDONED);
+		when(jobRepository.getJobExecution(111L)).thenReturn(jobExecution);
+		when(jobRepository.getLastJobExecution(jobInstance)).thenReturn(jobExecution);
+		assertThrows(UnexpectedJobExecutionException.class, () -> jobOperator.recover(jobExecution));
+	}
+
+	@Test
+	void testRecoverJobCompleted() {
+		JobInstance jobInstance = new JobInstance(123L, job.getName());
+		JobExecution jobExecution = new JobExecution(jobInstance, 111L, jobParameters);
+		jobExecution.setStatus(BatchStatus.COMPLETED);
+		when(jobRepository.getJobExecution(111L)).thenReturn(jobExecution);
+		when(jobRepository.getLastJobExecution(jobInstance)).thenReturn(jobExecution);
+		assertThrows(UnexpectedJobExecutionException.class, () -> jobOperator.recover(jobExecution));
+	}
+
 	static class MockJob extends AbstractJob {
 
 		private TaskletStep taskletStep;