236 lines
8.8 KiB
HTML
236 lines
8.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<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))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: Using KeyedDataQueue classes to read entries off a data queue" />
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<meta name="abstract" content="" />
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<meta name="description" content="" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Identifier" content="dqkeyedconsumerexample" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: Using KeyedDataQueue classes to read entries off a data queue</title>
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</head>
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<body id="dqkeyedconsumerexample"><a name="dqkeyedconsumerexample"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: Using KeyedDataQueue classes to read entries off a data queue</h1>
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<div><p></p>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm#codedisclaimer">Code
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example disclaimer</a> for important legal information.</div>
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<pre>///////////////////////////////////////////////////////////////////////////////
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//
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// Keyed Data Queue example. This program uses the KeyedDataQueue classes to
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// read entries off a data queue on the server. The entries were put on the
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// queue with the DQKeyedProducer example program.
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//
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// The key is a number and the data is a unicode string. This program
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// shows one way to convert the byte array to a Java int and to read
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// a byte array and convert it into a Java string.
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//
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// This is the consumer side of the producer/consumer example. It reads
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// entries off the queue and process them.
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//
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// Command syntax:
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// DQKeyedConsumer system
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//
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///////////////////////////////////////////////////////////////////////////////
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import java.io.*;
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import java.util.*;
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import java.net.*;
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import com.ibm.as400.access.*;
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public class DQKeyedConsumer extends Object
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{
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public static void main(String[] parameters)
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{
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System.out.println( " " );
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// if a system name was not specified, display help text and exit.
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if (parameters.length >= 1)
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{
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// The first parameter is the system that contains the data queue.
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String system = parameters[0];
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// Create byte arrays for the priority boundries:
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// 100 + = high priority
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// 50 - 100 = medium priority
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// 0 - 49 = low priority
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byte [] key0 = new byte[4];
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key0[0] = 0;
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key0[1] = 0;
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key0[2] = 0;
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key0[3] = 0;
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byte [] key50 = new byte[4];
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key50[0] = (byte) (50 >>> 24);
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key50[1] = (byte) (50 >>> 16);
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key50[2] = (byte) (50 >>> 8);
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key50[3] = (byte) (50);
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byte [] key100 = new byte[4];
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key100[0] = (byte) (100 >>> 24);
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key100[1] = (byte) (100 >>> 16);
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key100[2] = (byte) (100 >>> 8);
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key100[3] = (byte) (100);
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try
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{
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// Create an AS400 object for the server that has the data queue.
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AS400 as400 = new AS400(system);
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// Create the data queue object that represents the data queue
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// on the server.
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QSYSObjectPathName name = new QSYSObjectPathName("JAVADEMO",
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"PRODCON2",
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"DTAQ");
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KeyedDataQueue dq = new KeyedDataQueue(as400, name.getPath());
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KeyedDataQueueEntry DQData = null;
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try
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{
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boolean Continue = true;
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// Go until the user ends us.
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while (Continue)
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{
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// Look for a high priority item on the queue. If one is
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// found process that item. Note the peek method does not
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// remove the item if one is found. Also note the timeout
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// is 0. If an item is not found we get control back with
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// a null data queue entry.
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DQData = dq.read(key100, 0, "GE");
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if (DQData != null)
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{
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processEntry(DQData);
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}
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// else no high priority item was found. Look for a medium
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// priority item.
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else
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{
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DQData = dq.read(key50, 0, "GE");
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if (DQData != null)
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{
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processEntry(DQData);
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}
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// else no medium priority item was found, look for a low
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// priority item.
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else
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{
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DQData = dq.read(key0, 0, "GE");
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if (DQData != null)
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{
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processEntry(DQData);
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}
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else
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{
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System.out.println("Nothing to process, will check again in 30 seconds");
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Thread.sleep(30000);
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}
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}
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}
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}
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}
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catch (Exception e)
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{
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// If any of the above operations failed say the data queue
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// operation failed and output the exception.
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System.out.println("Could not read from the data queue.");
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System.out.println(e);
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};
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}
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catch (Exception e)
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{
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// If any of the above operations failed say the data queue
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// operation failed and output the exception.
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System.out.println("Data Queue operation failed");
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System.out.println(e);
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}
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}
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// Display help text when parameters are incorrect.
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else
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{
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System.out.println("");
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System.out.println("");
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System.out.println("");
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System.out.println("Parameters are not correct. Command syntax is:");
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System.out.println("");
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System.out.println(" DQKeyedConsumer system");
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System.out.println("");
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System.out.println("Where");
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System.out.println("");
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System.out.println(" system = Server that has the data queue");
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System.out.println("");
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System.out.println("For example:");
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System.out.println("");
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System.out.println("");
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System.out.println(" DQKeyedConsumer mySystem");
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System.out.println("");
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System.out.println("");
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}
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System.exit(0);
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}
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static void processEntry(KeyedDataQueueEntry DQData)
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{
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try
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{
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// The data is a string. Get the string out of the data queue entry.
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// In the data queue entry the data is a byte array so convert the
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// entry from a byte array into a string.
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String message = new String(DQData.getData(), "UnicodeBig");
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// The key is a byte array. Get the key out of the data queue entry
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// and convert it into a number.
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byte [] keyData = DQData.getKey();
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int keyValue = ((keyData[0] & 0xFF) << 24) +
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((keyData[1] & 0xFF) << 16) +
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((keyData[2] & 0xFF) << 8) +
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(keyData[3] & 0xFF);
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// Output the entry.
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System.out.println("Priority: " + keyValue + " message: " + message);
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}
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catch (Exception e)
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{
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// If any of the above operations failed say the data queue operation
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// failed and output the exception.
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System.out.println("Could not read from the data queue");
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System.out.println(e);
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}
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}
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}</pre>
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</div>
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</div>
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</body>
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</html>
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