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Re: [netrexx-pipelines] Restart do loop from catch in pipes
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From: Jeff H. <Je...@Je...> - 2020-04-02 12:15:01
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<p>Can you do this and have it work?:</p>
<p><font face="Century Gothic"><font face="Courier New, Courier,
monospace">do </font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> loop forever</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . peekto…</font></font></p>
<p><font face="Century Gothic"><font face="Courier New, Courier,
monospace"> do </font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . process input record . . .</font></font></p>
<p><font face="Century Gothic"><font face="Courier New, Courier,
monospace"> catch </font></font><font face="Century
Gothic"><font face="Courier New, Courier, monospace">UnknownHostExceptiom</font></font></p>
<p><font face="Century Gothic"><font face="Courier New, Courier,
monospace"> </font></font><font face="Century
Gothic"><font face="Courier New, Courier, monospace">handle
problem</font></font></p>
<p><font face="Century Gothic"><font face="Courier New, Courier,
monospace"> end</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . output. . .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . readto. . .</font></font><br>
<br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">-- catch UnknownHostExceptiom</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">-- do</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">-- . . . handle problem. . .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">-- . . . output. . .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">-- . . . readto. . .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">-- . . . << here I want to head up to
forever loop to do next record>>. .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> </font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">-- catch StageError</font></font><br>
<br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">-- end /*do UnknownHostException */ </font></font><br>
<br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> catch StageError</font></font><br>
<br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> end /*do loop forever */</font></font></p>
<div class="moz-cite-prefix">On 3/31/2020 11:35 PM, ColinK wrote:<br>
</div>
<blockquote type="cite"
cite="mid:407...@im...">
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<font face="Century Gothic">I am working on creating the NetRexx
pipeline filter that mimics the VM/CMS filter HOSTBYNAME and I
have run into a problem that I am not sure how to get around
(perhaps partly because I am not very Java savvy).<br>
<br>
When a hostname is passed to the routine that cannot be resolved
an UnknownHostException is thrown. I can catch this (in fact I
have to catch it since it is a checked exception) and handle it
but how do I get back up into the main forever loop to process
the next input record? It seems that once I am in a catch
section the stage collapses. The Rexx iterate statement does not
work since it is not in the first ‘instructionlist’ section. <br>
<font face="Courier New, Courier, monospace"><br>
</font></font>
<blockquote><font face="Century Gothic"><font face="Courier New,
Courier, monospace">do </font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> loop forever</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . peekto…</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . process input record . . .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . output. . .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . readto. . .</font></font><br>
<br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> catch UnknownHostExceptiom</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> do</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . handle problem. . .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . output. . .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . readto. . .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> . . . << here I want to head up to
forever loop to do next record>>. .</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> </font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> catch StageError</font></font><br>
<br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> end /*do UnknownHostException */ </font></font><br>
<br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> catch StageError</font></font><br>
<br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace"> end /*do loop forever */</font></font><br>
</blockquote>
<font face="Century Gothic"> <br>
It would be interesting to see how a real VM/CMS system handles
the following:</font><br>
<blockquote><font face="Century Gothic"><font face="Courier New,
Courier, monospace"><font face="Century Gothic"><font
face="Courier New, Courier, monospace"> pipe "(end ?)
literal <a class="moz-txt-link-abbreviated"
href="http://www.shaw.ca;dns.google;bogus.bogus;www.google.ca"
moz-do-not-send="true">www.shaw.ca;dns.google;bogus.bogus;www.google.ca</a>
| split string /;/ | h: hostbyname | console<br>
<br>
</font></font>pipe "(end ?) literal <a
class="moz-txt-link-abbreviated"
href="http://www.shaw.ca;dns.google;bogus.bogus;www.google.ca"
moz-do-not-send="true">www.shaw.ca;dns.google;bogus.bogus;www.google.ca</a>
| split string /;/ | h: hostbyname | console ? h: | insert
,Bad: , BEFORE | console"</font></font><br>
</blockquote>
<font face="Century Gothic"><br>
Right now my grand attempt pumps out the following:<br>
</font>
<blockquote><font face="Century Gothic"><font face="Courier New,
Courier, monospace">Z:\NetRexx-3.08-GA\bin>pipe "(end ?)
literal <a class="moz-txt-link-abbreviated"
href="http://www.shaw.ca;dns.google;bogus.bogus;www.google.ca"
moz-do-not-send="true">www.shaw.ca;dns.google;bogus.bogus;www.google.ca</a>
| split string /;/ | h: hostbyname | console</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">23.6.246.208</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">8.8.4.4 8.8.8.8</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">Input record 3: Unable to determine IP address
for bogus.bogus</font></font><br>
</blockquote>
<blockquote><font face="Century Gothic"><font face="Courier New,
Courier, monospace"><font face="Century Gothic"><font
face="Courier New, Courier, monospace">Z:\NetRexx-3.08-GA\bin></font></font>pipe
"(end ?) literal <a class="moz-txt-link-abbreviated"
href="http://www.shaw.ca;dns.google;bogus.bogus;www.google.ca"
moz-do-not-send="true">www.shaw.ca;dns.google;bogus.bogus;www.google.ca</a>
| split string /;/ | h: hostbyname | console ? h: | insert
,Bad: , BEFORE | console"</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">23.6.246.208</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">8.8.4.4 8.8.8.8</font></font><br>
<font face="Century Gothic"><font face="Courier New, Courier,
monospace">Input record 3: Unable to determine IP address
for bogus.bogus</font></font><br>
</blockquote>
<font face="Century Gothic">Note that the 4th hostname does not
appear to be processed.<br>
<br>
Is there some kind of trick in handling this scenario.<br>
<br>
Thanks.<br>
Colin<br>
<br>
</font> <br>
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