Spring-Batch-02-Split

BatchJobConfig.java

package xin.lowang.springbatch.config;

import java.util.Collections;
import java.util.List;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.core.job.builder.FlowBuilder;
import org.springframework.batch.core.job.flow.Flow;
import org.springframework.batch.core.job.flow.support.SimpleFlow;
import org.springframework.batch.core.launch.support.RunIdIncrementer;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.database.BeanPropertyItemSqlParameterSourceProvider;
import org.springframework.batch.item.database.JdbcBatchItemWriter;
import org.springframework.batch.item.file.FlatFileItemReader;
import org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper;
import org.springframework.batch.item.file.mapping.DefaultLineMapper;
import org.springframework.batch.item.file.transform.DelimitedLineTokenizer;
import org.springframework.batch.item.support.ListItemReader;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.task.SimpleAsyncTaskExecutor;

import xin.lowang.springbatch.domain.Person;
import xin.lowang.springbatch.processor.PersonItemProcessor;

@Configuration
@EnableBatchProcessing
public class BatchJobConfig {
    @Autowired
    public JobBuilderFactory jobBuilderFactory;
    @Autowired
    public StepBuilderFactory stepBuilderFactory;
    @Autowired
    public DataSource dataSource;

    @Bean
    public FlatFileItemReader reader() {
        FlatFileItemReader reader = new FlatFileItemReader<>();
        reader.setResource(new ClassPathResource("sample-data.csv"));
        reader.setLineMapper(new DefaultLineMapper() {
            {
                setFieldSetMapper(new BeanWrapperFieldSetMapper() {
                    {
                        setTargetType(Person.class);
                    }
                });
                setLineTokenizer(new DelimitedLineTokenizer() {
                    {
                        setNames(new String[] { "firstName", "lastName" });
                    }
                });
            }
        });
        return reader;
    }

    @Bean
    public PersonItemProcessor processor() {
        return new PersonItemProcessor();
    }

    @Bean
    public JdbcBatchItemWriter dbWriter() {
        JdbcBatchItemWriter writer = new JdbcBatchItemWriter();
        writer.setItemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider());
        writer.setSql("INSERT INTO people (first_name, last_name) VALUES (:firstName, :lastName)");
        writer.setDataSource(dataSource);
        return writer;
    }

    @Bean
    public PrintItemWriter printWriter() {
        return new PrintItemWriter() {
            @Override
            public void write(List items) throws Exception {
                items.stream().forEach(person -> {
                    System.out.println(person.getFirstName() + " is ok");
                });
            }
        };
    }

    @Bean
    public LogItemWriter logWriter() {
        return new LogItemWriter() {
            @Override
            public void write(List items) throws Exception {
                items.stream().forEach(person -> {log.info("person {} is ok",person); });
            }
        };
    }

    //定义step和job
    @Bean
    public Step printStep() {
        return stepBuilderFactory.get("printStep")
                .chunk(2)
                .reader(reader())
                .processor(processor())
                .writer(printWriter())
                .build();
    }

    @Bean
    public Step logStep() {
        return stepBuilderFactory
                .get("logStep")
                .chunk(2)
                .reader(new ListItemReader<>(Collections.singletonList(new Person("chenghao", "Wang"))))
                .writer(logWriter())
                .build();
    }

    @Bean
    public Job importUserJob() {
        
        Flow flow = new FlowBuilder("asyncFlow").start(logStep()).build();
        return jobBuilderFactory
                .get("importUserJob")
                .incrementer(new RunIdIncrementer())
                .flow(printStep())
                .split(new SimpleAsyncTaskExecutor()).add(flow).build().build();
                //.next(logStep())
                //.end()
                //.build();
    }

    public class PrintItemWriter implements ItemWriter {
        @Override
        public void write(List items) throws Exception {
        }
    }

    public class LogItemWriter implements ItemWriter {
        protected final Logger log = LoggerFactory.getLogger(LogItemWriter.class);

        @Override
        public void write(List items) throws Exception {
        }
    }
}