[英]Spring boot batch scheduler run once
I started to learn Spring Boot Batch in version 2.1.4 我开始在2.1.4版本中学习Spring Boot Batch
I want to run my job in scheduler and this job runs only once. 我想在调度程序中运行我的工作,而该工作仅运行一次。 I mean ItemProcessor and ItemWriter run only once. 我的意思是ItemProcessor和ItemWriter仅运行一次。 ItemReader runs every time. ItemReader每次都会运行。 anyone have an idea what I did wrong. 任何人都知道我做错了什么。 In the future, I want to change scheduler to Java WatchService and pass filePath to the job but now parameter for filePath is like a string in the function parameter. 将来,我想将调度程序更改为Java WatchService,并将filePath传递给作业,但现在filePath的参数就像function参数中的字符串一样。 This is my code: 这是我的代码:
This is my reader: 这是我的读者:
@Component
public class UserReaderImpl {
@StepScope
public ItemReader<UserCsvStructure> read(String filepath) {
FlatFileItemReader<UserCsvStructure> reader = new FlatFileItemReader();
reader.setLinesToSkip(1);
reader.setResource(new FileSystemResource(filepath));
reader.setLineMapper(new DefaultLineMapper<UserCsvStructure>() {
{
setLineTokenizer(new DelimitedLineTokenizer() {
{
setNames(new String[]{"firstName","lastName","email"});
}
});
setFieldSetMapper(new BeanWrapperFieldSetMapper<UserCsvStructure>() {
{
setTargetType(UserCsvStructure.class);
}
});
}
});
return reader;
}
}
This in my ItemProcessor 这在我的ItemProcessor中
@StepScope
@Component
public class UserProcessorImpl implements ItemProcessor<UserCsvStructure, User> {
@Override
public User process(UserCsvStructure userCsvStructure) throws Exception {
return User.builder()
.email(userCsvStructure.getEmail())
.firstName(userCsvStructure.getFirstName())
.lastName(userCsvStructure.getLastName())
.build();
}
}
This is my ItemWriter 这是我的ItemWriter
@Component
@StepScope
public class UserWriterImpl implements ItemWriter<User>{
@Autowired
private UserRepository userRepository;
@Override
public void write(List<? extends User> list) throws Exception {
System.out.println(list);
userRepository.saveAll(list);
}
}
And this is my configuration 这是我的配置
@Component
public class UserBatchCsvConfig {
@Autowired
public JobBuilderFactory jobBuilderFactory;
@Autowired
public StepBuilderFactory stepBuilderFactory;
@Autowired
private UserReaderImpl userReader;
@Autowired
private UserWriterImpl userWriter;
@Autowired
private UserProcessorImpl userProcessor;
public Job csvFileToDatabaseJob(UserJobCompletionNotificationListener listener, String fileName) {
return jobBuilderFactory.get("userCsvProcess")
.incrementer(new RunIdIncrementer())
.listener(listener)
.flow(csvFileToDatabaseStep(fileName))
.end()
.build();
}
private Step csvFileToDatabaseStep(String fileName) {
return stepBuilderFactory.get("userCsvProcess")
.<UserCsvStructure, User>chunk(1)
.reader(userReader.read(fileName))
.processor(userProcessor)
.writer(userWriter)
.build();
}
}
Last class is my scheduler: 最后一课是我的调度程序:
@Component
public class UserCsvProcessor {
@Autowired
private JobLauncher jobLauncher;
@Autowired
private UserBatchCsvConfig job;
@Autowired
private UserJobCompletionNotificationListener userJobCompletionNotificationListener;
@Scheduled(fixedDelay = 10000)
public void runJob() throws Exception {
jobLauncher.run(job.csvFileToDatabaseJob(userJobCompletionNotificationListener, "C:\\Users\\Anik\\Desktop\\angular\\test.csv"), new JobParameters());
}
}
I know what should I add in my code In UserCsvProcessor class I need to change my scheduled function to: 我知道我应该在代码中添加些什么在UserCsvProcessor类中,我需要将计划的函数更改为:
@Scheduled(fixedDelay = 10000)
public void runJob() throws Exception {
JobParameters params = new JobParametersBuilder()
.addString("JobID", String.valueOf(System.currentTimeMillis()))
.toJobParameters();
jobLauncher.run(job.csvFileToDatabaseJob(userJobCompletionNotificationListener, "C:\\Users\\Anik\\Desktop\\angular\\test.csv"), params);
}
If someone has other idea or better idea just add an answer 如果有人有其他想法或更好的想法,只需添加答案
With the configuration you have in @Scheduled annotation you are indicating to be executed every 10 seconds. 使用@Scheduled批注中的配置时,表示每10秒执行一次。 So, when your first execution is completed it will wait 10 seconds and then execute it again and so on. 因此,当您的第一次执行完成时,它将等待10秒钟,然后再次执行,依此类推。
@Scheduled(fixedDelay = 10000)
If you want to execute it once (I guess it is once a day) you can use cron expression in your @Scheduled annotation. 如果要执行一次(我想每天执行一次),则可以在@Scheduled批注中使用cron表达式。 Check the example below where the cron expression indicates that the method should be executed every day at 10:15 am 检查下面的示例,其中cron表达式指示该方法应每天在上午10:15执行。
@Scheduled(cron = "0 15 10 * * *")
If you want to run it once a month/year you can handle the cron expression to do that. 如果您想每月/每年运行一次,则可以处理cron表达式来执行此操作。 Additionally, you can read that expression from the configuration file using something like the following: 此外,您可以使用以下类似内容从配置文件中读取该表达式:
@Scheduled(cron = "${cron.expression}")
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