使用批处理数据流框架

本主题向您显示了如何使用批处理数据流 (BDS) 框架的示例。

开始之前

确定要使用的正确模式。根据您需要哪种类型的数据流来选择模式。例如,如果要从文件中读取文本,请选择 FileReaderPattern。请参阅批处理数据流框架和模式以了解模式的选集。

过程

  1. 实现模式接口:
    <codeblock>package com.ibm.websphere.samples;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.util.Properties;
    
    import com.ibm.websphere.batch.devframework.configuration.BDSFWLogger;
    import com.ibm.websphere.batch.devframework.datastreams.patternadapter.FileReaderPattern;
    
    // Implement the FileReaderPattern
    public class TransactionListStream implements FileReaderPattern {
    	private Properties properties;
    	private BDSFWLogger logger;
    
    /**
       Save properties specified in the xJCL
    */
    
    	public void initialize(Properties props) {
    // create logger
    		logger = new BDSFWLogger(props);
    		
    		if (logger.isDebugEnabled())
    			logger.debug("entering TransactionListInputStream.initialize()");
    		properties = props;
    
    	}
    
    
    // This method is where you should add the business logic of processing the read //string
    	public Object fetchRecord(BufferedReader reader) throws IOException {
    		String str = null;
    		Posting posting = null;
    		if (logger.isDebugEnabled())
    logger.debug("Entering TransactionListInputStream.fetchRecord");
    		if(reader.ready()) {
    			str = reader.readLine();
    		}
    		if(str != null) {
    			
    			posting = _generateRecord(str);
    			
    		}
    				
    		if (logger.isDebugEnabled())
    			logger.debug("Exiting TransactionListInputStream.fetchRecord with " + posting);
    		return posting;
    		
    	}
    	// Helper method that parses the read string and creates an internal object for use
     // by other parts of the code
    	private Posting _generateRecord(String str) {
    		Posting post = null;
    		String [] tokens = str.split(",", 3);
    	
    		if(tokens.length == 3) {
    			
    			String txTypeStr = tokens[0];
    			String actNoStr = tokens[1];
    			String amtStr = tokens[2];
    			
    			int txType = Integer.parseInt(txTypeStr);
    			double amt = Double.parseDouble(amtStr);
    			post = new Posting(txType,actNoStr,amt);
    			
    			
    		} else {
    			logger.error("Invalid csv string" + str);
    		}
    		if(logger.isDebugEnabled())
    			logger.debug("Loaded posting record " + post);
    		return post;
    	}
    	public void processHeader(BufferedReader reader) throws IOException {
    		// NO OP for this sample
    
    	}
    
    }
    </codeblock>
  2. 引用您在上一步中创建的类,以及 xJCL 中的支持类。

xJCL 示例

<codeblock><batch-data-streams>		
	 <bds>
          <logical-name>txlististream</logical-name>
          <props>
<prop name="IMPLCLASS" value= "com.ibm.websphere.samples.TransactionListStream"/>
            	<prop name="FILENAME" value="/opt/inputfile.txt"/>
            	<prop name="debug" value="true"/>  
          </props>
<impl-class> com.ibm.websphere.batch.devframework.datastreams.patterns.TextFileReader </impl-class>
	</bds>
</batch-data-streams>

</codeblock>

下一步做什么

安装应用程序。

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