Я работаю над весенним пакетным проектом, в котором я читаю список студентов, обрабатываю его и пишу.
Пока я сохранил его простым, а обработка просто возвращает студента и пишет только распечатки it.
Я ожидал, что каждый раз при выполнении шага я увижу вывод, но я вижу его только один раз, когда шаг выполняется в первый раз. Ниже приведен вывод
2020-04-03 01:33:16.153 INFO 14710 --- [ main] o.s.batch.core.job.SimpleStepHandler : Executing step: [xxxx]
[Student{id=1, name='ABC'}]
as
[Student{id=2, name='DEF'}]
as
[Student{id=3, name='GHI'}]
as
2020-04-03 01:33:16.187 INFO 14710 --- [ main] o.s.batch.core.step.AbstractStep : Step: [xxxx] executed in 33ms
2020-04-03 01:33:16.190 INFO 14710 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : Job: [SimpleJob: [name=readStudents]] completed with the following parameters: [{}] and the following status: [COMPLETED] in 52ms
job triggered
2020-04-03 01:33:17.011 INFO 14710 --- [ scheduling-1] o.s.b.c.l.support.SimpleJobLauncher : Job: [SimpleJob: [name=readStudents]] launched with the following parameters: [{time=1585857797003}]
2020-04-03 01:33:17.017 INFO 14710 --- [ scheduling-1] o.s.batch.core.job.SimpleStepHandler : Executing step: [xxxx]
2020-04-03 01:33:17.022 INFO 14710 --- [ scheduling-1] o.s.batch.core.step.AbstractStep : Step: [xxxx] executed in 4ms
2020-04-03 01:33:17.024 INFO 14710 --- [ scheduling-1] o.s.b.c.l.support.SimpleJobLauncher : Job: [SimpleJob: [name=readStudents]] completed with the following parameters: [{time=1585857797003}] and the following status: [COMPLETED] in 11ms
Также я замечаю, что впервые в работе нет параметров, а после этого есть параметры. Принимая во внимание, что я предоставляю параметры задания каждый раз, когда запускаю задание.
Файл конфигурации
@EnableBatchProcessing
public class Config {
private JobRunner jobRunner;
public Config(JobRunner jobRunner){
this.jobRunner = jobRunner;
}
@Scheduled(cron = "* * * * * *")
public void scheduleJob() throws JobParametersInvalidException, JobExecutionAlreadyRunningException, JobRestartException, JobInstanceAlreadyCompleteException {
System.out.println("job triggered");
jobRunner.runJob();
}
}
@Configuration
public class JobConfig {
@Bean
public Job job(JobBuilderFactory jobBuilderFactory,
StepBuilderFactory stepBuilderFactory,
ItemReader<Student> reader,
ItemProcessor<Student, Student> processor,
ItemWriter<Student> writer) {
Step step = stepBuilderFactory.get("xxxx")
.<Student, Student>chunk(1)
.reader(reader)
.processor(processor)
.writer(writer)
.build();
return jobBuilderFactory
.get("readStudents")
.start(step)
.build();
}
@Bean
public ItemReader<Student> reader() {
return new InMemoryStudentReader();
}
}
Файл запуска задания
public class JobRunner {
private Job job;
private JobLauncher simpleJobLauncher;
@Autowired
public JobRunner(Job job, JobLauncher jobLauncher) {
this.simpleJobLauncher = jobLauncher;
this.job = job;
}
public void runJob() throws JobParametersInvalidException, JobExecutionAlreadyRunningException, JobRestartException, JobInstanceAlreadyCompleteException {
JobParameters jobParameters =
new JobParametersBuilder()
.addLong("time",System.currentTimeMillis()).toJobParameters();
simpleJobLauncher.run(job, jobParameters);
}
}
В памяти устройства чтения
public class InMemoryStudentReader implements ItemReader<Student> {
private int nextStudentIndex;
private List<Student> studentData;
public InMemoryStudentReader() {
initialize();
}
private void initialize() {
Student s1 = new Student(1, "ABC");
Student s2 = new Student(2, "DEF");
Student s3 = new Student(3, "GHI");
studentData = Collections.unmodifiableList(Arrays.asList(s1, s2,s3));
nextStudentIndex = 0;
}
@Override
public Student read() throws Exception {
Student nextStudent = null;
if (nextStudentIndex < studentData.size()) {
nextStudent = studentData.get(nextStudentIndex);
nextStudentIndex++;
}
return nextStudent;
}
}