90 lines
4.4 KiB
HTML
90 lines
4.4 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 name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: Wait up to two hours to receive data from data queue" />
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<meta name="abstract" content="This example shows a program waiting up to two hours to receive an entry from a data queue." />
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<meta name="description" content="This example shows a program waiting up to two hours to receive an entry from a data queue." />
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<meta name="DC.subject" content="data queue, example, data queue, using" />
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<meta name="keywords" content="data queue, example, data queue, using" />
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<meta name="DC.Relation" scheme="URI" content="explq.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Identifier" content="dqex1" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: Wait up to two hours to receive data from data queue</title>
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</head>
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<body id="dqex1"><a name="dqex1"><!-- --></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: Wait up to two hours to receive data from data queue</h1>
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<div><p>This example shows a program waiting up to two hours to receive
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an entry from a data queue.</p>
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<div class="section"><p>In the following example, program B specifies to wait up to two
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hours (7200 seconds) to receive an entry from the data queue. Program A sends
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an entry to data queue DTAQ1 in library QGPL. If program A sends an entry
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within two hours, program B receives the entries from this data queue. Processing
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begins immediately. If two hours elapse without procedure A sending an entry,
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program B processes the time-out condition because the field length returned
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is 0. Program B continues receiving entries until this time-out condition
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occurs. The programs are written in CL; however, either program could be written
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in any high-level language.</p>
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</div>
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<div class="section"><p>The data queue is created with the following command: </p>
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<pre>CRTDTAQ DTAQ(QGPL/DTAQ1) MAXLEN(80)</pre>
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</div>
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<div class="section"><p>In this example, all data queue entries are 80 bytes long.</p>
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</div>
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<div class="section"><p>In program A, the following statements relate to the data queue:
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</p>
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<pre>PGM
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DCL &FLDLEN *DEC LEN(5 0) VALUE(80)
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DCL &FIELD *CHAR LEN(80)
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.
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.(determine data to be sent to the queue)
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.
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CALL QSNDDTAQ PARM(DTAQ1 QGPL &FLDLEN &FIELD)
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.
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.
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.</pre>
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</div>
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<div class="section"><p>In program B, the following statements relate to the data queue:
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</p>
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<pre> PGM
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DCL &FLDLEN *DEC LEN(5 0) VALUE(80)
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DCL &FIELD *CHAR LEN(80)
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DCL &WAIT *DEC LEN(5 0) VALUE(7200) /* 2 hours */
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.
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.
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.
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LOOP: CALL QRCVDTAQ PARM(DTAQ1 QGPL &FLDLEN &FIELD &WAIT)
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IF (&FLDLEN *NE 0) DO /* Entry received */
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.
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. (process data from data queue)
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.
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GOTO LOOP /* Get next entry from data queue */
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ENDDO
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.
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. (no entries received for 2 hours; process time-out condition)
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.</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="explq.htm" title="This includes examples of three methods for processing data queue files.">Examples: Use a data queue</a></div>
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</div>
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</div>
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</body>
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</html>
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