<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html lang="en-us" xml:lang="en-us"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="security" content="public" /> <meta name="Robots" content="index,follow" /> <meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' /> <meta name="DC.Type" content="reference" /> <meta name="DC.Title" content="Example: Using DataQueue classes to read entries off a data queue" /> <meta name="abstract" content="" /> <meta name="description" content="" /> <meta name="copyright" content="(C) Copyright IBM Corporation 2006" /> <meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" /> <meta name="DC.Format" content="XHTML" /> <meta name="DC.Identifier" content="dqconsumerexample" /> <meta name="DC.Language" content="en-us" /> <!-- All rights reserved. Licensed Materials Property of IBM --> <!-- US Government Users Restricted Rights --> <!-- Use, duplication or disclosure restricted by --> <!-- GSA ADP Schedule Contract with IBM Corp. --> <link rel="stylesheet" type="text/css" href="./ibmdita.css" /> <link rel="stylesheet" type="text/css" href="./ic.css" /> <title>Example: Using DataQueue classes to read entries off a data queue</title> </head> <body id="dqconsumerexample"><a name="dqconsumerexample"><!-- --></a> <!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script> <h1 class="topictitle1">Example: Using DataQueue classes to read entries off a data queue</h1> <div><p></p> <div class="section"><div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm#codedisclaimer">Code example disclaimer</a> for important legal information.</div> <pre>/////////////////////////////////////////////////////////////////////////////// // // Data Queue example. This program uses the Data Queue classes to read // entries off a data queue on the server. The entries were put on the // queue with the DQProducer example program. // // This is the consumer side of the producer/consumer example. It reads // entries off the queue and process them. // // Command syntax: // DQConsumerExample system // /////////////////////////////////////////////////////////////////////////////// import java.io.*; import java.util.*; import java.net.*; import com.ibm.as400.access.*; public class DQConsumerExample extends Object { public static void main(String[] parameters) { System.out.println( " " ); // if a system name was not specified, display help text and exit. if (parameters.length >= 1) { try { // The first parameter is the system that contains the data queue. String system = parameters[0]; // Create an AS400 object for the server that has the data queue. AS400 as400 = new AS400(system); // Build a record format for the format of the data queue entry. // This format matches the format in the DQProducer class. A // record consists of: // - a four byte number -- the customer number // - a four byte number -- the part number // - a 20 character string -- the part description // - a four byte number -- the number of parts in this order // First create the base data types. BinaryFieldDescription customerNumber = new BinaryFieldDescription(new AS400Bin4(), "CUSTOMER_NUMBER"); BinaryFieldDescription partNumber = new BinaryFieldDescription(new AS400Bin4(), "PART_NUMBER"); CharacterFieldDescription partName = new CharacterFieldDescription(new AS400Text(20, as400), "PART_NAME" BinaryFieldDescription quantity = new BinaryFieldDescription(new AS400Bin4(), "QUANTITY" // Build a record format and fill it with the base data types. RecordFormat dataFormat = new RecordFormat(); dataFormat.addFieldDescription(customerNumber); dataFormat.addFieldDescription(partNumber); dataFormat.addFieldDescription(partName); dataFormat.addFieldDescription(quantity); // Create the data queue object that represents the data queue on // the server. DataQueue dq = new DataQueue(as400, "/QSYS.LIB/JAVADEMO.LIB/PRODCONS.DTAQ"); boolean Continue = true; // Read the first entry off the queue. The timeout value is // set to -1 so this program will wait forever for an entry. System.out.println("*** Waiting for an entry for process ***"); DataQueueEntry DQData = dq.read(-1); while (Continue) { // We just read an entry off the queue. Put the data into // a record object so the program can access the fields of // the data by name. The Record object will also convert // the data from server format to Java format. Record data = dataFormat.getNewRecord(DQData.getData()); // Get two values out of the record and display them. Integer amountOrdered = (Integer) data.getField("QUANTITY"); String partOrdered = (String) data.getField("PART_NAME"); System.out.println("Need " + amountOrdered + " of " + partOrdered); System.out.println(" "); System.out.println("*** Waiting for an entry for process ***"); // Wait for the next entry. DQData = dq.read(-1); } } catch (Exception e) { // If any of the above operations failed say the data queue // operation failed and output the exception. System.out.println("Data Queue operation failed"); System.out.println(e); } } // Display help text when parameters are incorrect. else { System.out.println(""); System.out.println(""); System.out.println(""); System.out.println("Parameters are not correct. Command syntax is:"); System.out.println(""); System.out.println(" DQConsumerExample system"); System.out.println(""); System.out.println("Where"); System.out.println(""); System.out.println(" system = Server that has the data queue"); System.out.println(""); System.out.println("For example:"); System.out.println(""); System.out.println(" DQConsumerExample mySystem"); System.out.println(""); System.out.println(""); } System.exit(0); } }</pre> </div> </div> </body> </html>