248 lines
8.6 KiB
HTML
248 lines
8.6 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="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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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: Listing spooled files asynchronously (using listeners)" />
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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.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="npexamplelistsplfasynch" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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: Listing spooled files asynchronously (using listeners)</title>
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</head>
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<body id="npexamplelistsplfasynch"><a name="npexamplelistsplfasynch"><!-- --></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: Listing spooled files asynchronously (using listeners)</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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// Example that shows listing all spooled files on a server asynchronously using
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// the PrintObjectListListener interface to get feedback as the list is being built.
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// Listing asynchronously allows the caller to start processing the list objects
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// before the entire list is built for a faster perceived response time
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// for the user.
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//
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/////////////////////////////////////////////////////////////////////////
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import com.ibm.as400.access.AS400;
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import com.ibm.as400.access.SpooledFileList;
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import com.ibm.as400.access.SpooledFile;
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import com.ibm.as400.access.ExtendedIllegalStateException;
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import com.ibm.as400.access.PrintObjectListListener;
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import com.ibm.as400.access.PrintObjectListEvent;
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public class NPExampleListSplfAsynch extends Object implements PrintObjectListListener
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{
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private AS400 system_;
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private boolean fListError;
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private boolean fListClosed;
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private boolean fListCompleted;
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private Exception listException;
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private int listObjectCount;
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public NPExampleListSplfAsynch(AS400 system)
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{
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system_ = system;
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}
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// list all spooled files on the server asynchronously using a listener
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public void listSpooledFiles()
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{
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fListError = false;
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fListClosed = false;
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fListCompleted = false;
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listException = null;
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listObjectCount = 0;
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try
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{
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String strSpooledFileName;
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boolean fCompleted = false;
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int listed = 0, size;
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if( system_ == null )
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{
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system_ = new AS400();
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}
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System.out.println(" Now receiving all spooled files Asynchronously using a listener");
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SpooledFileList splfList = new SpooledFileList(system_);
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// set filters, all users, on all queues
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splfList.setUserFilter("*ALL");
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splfList.setQueueFilter("/QSYS.LIB/%ALL%.LIB/%ALL%.OUTQ");
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// add the listener.
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splfList.addPrintObjectListListener(this);
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// open the list, openAsynchronously returns immediately
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splfList.openAsynchronously();
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do
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{
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// wait for the list to have at least 25 objects or to be done
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waitForWakeUp();
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fCompleted = splfList.isCompleted();
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size = splfList.size();
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// output the names of all objects added to the list
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// since we last woke up
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while (listed < size)
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{
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if (fListError)
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{
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System.out.println(" Exception on list - " + listException);
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break;
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}
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if (fListClosed)
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{
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System.out.println(" The list was closed before it completed!");
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break;
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}
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SpooledFile splf = (SpooledFile)splfList.getObject(listed++);
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if (splf != null)
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{
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// output this spooled file name
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strSpooledFileName = splf.getStringAttribute(SpooledFile.ATTR_SPOOLFILE);
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System.out.println(" spooled file = " + strSpooledFileName);
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}
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}
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} while (!fCompleted);
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// clean up after we are done with the list
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splfList.close();
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splfList.removePrintObjectListListener(this);
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}
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catch( ExtendedIllegalStateException e )
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{
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System.out.println(" The list was closed before it completed!");
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}
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catch( Exception e )
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{
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// ...handle any other exceptions...
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e.printStackTrace();
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}
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}
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// This is where the foreground thread waits to be awaken by the
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// the background thread when the list is updated or it ends.
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private synchronized void waitForWakeUp() throws InterruptedException
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{
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// don''t go back to sleep if the listener says the list is done
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if (!fListCompleted)
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{
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wait();
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}
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}
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// The following methods implement the PrintObjectListListener interface
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// This method is invoked when the list is closed.
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public void listClosed(PrintObjectListEvent event)
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{
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System.out.println("*****The list was closed*****");
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fListClosed = true;
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synchronized(this)
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{
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// Set flag to indicate that the list has
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// completed and wake up foreground thread.
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fListCompleted = true;
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notifyAll();
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}
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}
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// This method is invoked when the list is completed.
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public void listCompleted(PrintObjectListEvent event)
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{
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System.out.println("*****The list has completed*****");
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synchronized (this)
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{
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// Set flag to indicate that the list has
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// completed and wake up foreground thread.
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fListCompleted = true;
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notifyAll();
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}
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}
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// This method is invoked if an error occurs while retrieving
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// the list.
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public void listErrorOccurred(PrintObjectListEvent event)
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{
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System.out.println("*****The list had an error*****");
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fListError = true;
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listException = event.getException();
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synchronized(this)
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{
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// Set flag to indicate that the list has
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// completed and wake up foreground thread.
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fListCompleted = true;
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notifyAll();
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}
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}
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// This method is invoked when the list is opened.
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public void listOpened(PrintObjectListEvent event)
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{
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System.out.println("*****The list was opened*****");
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listObjectCount = 0;
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}
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// This method is invoked when an object is added to the list.
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public void listObjectAdded(PrintObjectListEvent event)
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{
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// every 25 objects we'll wake up the foreground
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// thread to get the latest objects...
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if( (++listObjectCount % 25) == 0 )
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{
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System.out.println("*****25 more objects added to the list*****");
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synchronized (this)
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{
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// wake up foreground thread
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notifyAll();
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}
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}
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}
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public static void main( String args[] )
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{
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NPExampleListSplfAsynch list = new NPExampleListSplfAsynch(new AS400());
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try{
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list.listSpooledFiles();
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}
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catch( Exception e )
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{
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e.printStackTrace();
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}
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System.exit(0);
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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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