批处理框架 Spring Batch 详解

    
    
    

 
     
     
     /**
 * Batch domain object representing a job. Job is an explicit abstraction
 * representing the configuration of a job specified by a developer. It should
 * be noted that restart policy is applied to the job as a whole and not to a
 * step.
 */
public interface Job {
 
 String getName();
 
 boolean isRestartable();
 
 void execute(JobExecution execution);
 
 JobParametersIncrementer getJobParametersIncrementer();
 
 JobParametersValidator getJobParametersValidator();
 
}

    
    
    

    
    
    

 
     
     
     @Bean
public Job footballJob() {
    return this.jobBuilderFactory.get("footballJob")
                     .start(playerLoad())
                     .next(gameLoad())
                     .next(playerSummarization())
                     .end()
                     .build();
}

    
    
    

    
    
    

 
     
     
     public interface JobInstance {
 /**
  * Get unique id for this JobInstance.
  * @return instance id
  */
 public long getInstanceId();
 /**
  * Get job name.
  * @return value of 'id' attribute from <job>
  */
 public String getJobName(); 
}

    
    
    

    
    
    

 
     
     
     public interface JobExecution {
 /**
  * Get unique id for this JobExecution.
  * @return execution id
  */
 public long getExecutionId();
 /**
  * Get job name.
  * @return value of 'id' attribute from <job>
  */
 public String getJobName(); 
 /**
  * Get batch status of this execution.
  * @return batch status value.
  */
 public BatchStatus getBatchStatus();
 /**
  * Get time execution entered STARTED status. 
  * @return date (time)
  */
 public Date getStartTime();
 /**
  * Get time execution entered end status: COMPLETED, STOPPED, FAILED 
  * @return date (time)
  */
 public Date getEndTime();
 /**
  * Get execution exit status.
  * @return exit status.
  */
 public String getExitStatus();
 /**
  * Get time execution was created.
  * @return date (time)
  */
 public Date getCreateTime();
 /**
  * Get time execution was last updated updated.
  * @return date (time)
  */
 public Date getLastUpdatedTime();
 /**
  * Get job parameters for this execution.
  * @return job parameters 
  */
 public Properties getJobParameters();
 
}

    
    
    

    
    
    

 
     
     
     public enum BatchStatus {STARTING, STARTED, STOPPING, 
   STOPPED, FAILED, COMPLETED, ABANDONED }

    
    
    

    
    
    

 
     
     
     ExecutionContext ecStep = stepExecution.getExecutionContext();
ExecutionContext ecJob = jobExecution.getExecutionContext();

    
    
    

    
    
    

 
     
     
     public interface JobLauncher {
 
public JobExecution run(Job job, JobParameters jobParameters)
            throws JobExecutionAlreadyRunningException, JobRestartException,
                   JobInstanceAlreadyCompleteException, JobParametersInvalidException;
}

    
    
    

    
    
    

 
     
     
     @Bean
public JdbcPagingItemReader itemReader(DataSource dataSource, PagingQueryProvider queryProvider) {
        Map<String, Object> parameterValues = new HashMap<>();
        parameterValues.put("status", "NEW");
 
        return new JdbcPagingItemReaderBuilder<CustomerCredit>()
                                           .name("creditReader")
                                           .dataSource(dataSource)
                                           .queryProvider(queryProvider)
                                           .parameterValues(parameterValues)
                                           .rowMapper(customerCreditMapper())
                                           .pageSize(1000)
                                           .build();
}
 
@Bean
public SqlPagingQueryProviderFactoryBean queryProvider() {
        SqlPagingQueryProviderFactoryBean provider = new SqlPagingQueryProviderFactoryBean();
 
        provider.setSelectClause("select id, name, credit");
        provider.setFromClause("from customer");
        provider.setWhereClause("where status=:status");
        provider.setSortKey("id");
 
        return provider;
}

    
    
    

    
    
    

 
     
     
     private JdbcCursorItemReader<Map<String, Object>> buildItemReader(final DataSource dataSource, String tableName,
            String tenant) {
 
        JdbcCursorItemReader<Map<String, Object>> itemReader = new JdbcCursorItemReader<>();
        itemReader.setDataSource(dataSource);
        itemReader.setSql("sql here");
        itemReader.setRowMapper(new RowMapper());
        return itemReader;
    }

    
    
    

spring.batch.job.enabled=false

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