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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.jboss.org/browse/SWITCHYARD" style="color: #3b73af; text-decoration: none">SwitchYard</a> / <a href="https://issues.jboss.org/browse/SWITCHYARD-2285" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-newfeature-e57a2e81-ab7b-47ef-bc25-150f3b4f3c2b" height="16" width="16" border="0" align="absmiddle" alt="Feature Request" style="vertical-align: text-bottom" /></a> <a href="https://issues.jboss.org/browse/SWITCHYARD-2285" style="color: #3b73af; text-decoration: none">SWITCHYARD-2285</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.jboss.org/browse/SWITCHYARD-2285" style="color: #3b73af; text-decoration: none">Provide two-way communication with a referenced services in Rules</a> </span>
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Affects Versions:
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2.0
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Unassigned
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Components:
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component-rules
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Created:
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26/Aug/14 10:54 AM
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="trohovsky" id="email_trohovsky" href="https://issues.jboss.org/secure/ViewProfile.jspa?name=trohovsky" style="color:#3b73af;; color: #3b73af; text-decoration: none">Tomas Rohovsky</a>
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Public (Everyone can see)
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Current implementation of reference invocation is based on a channel. A channel is one-way communication mechanism. I am not sure how much is it a valid use-case to have two-way communication in Drools, but two-way communication would be nice.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">(04:11:20 PM) errantepiphany: trohovsk: Drools Channels are indeed one-way. We have a SwitchYard Service Channel that invokes SwitchYard service references. It's just there as a convenience.<br /> (04:11:25 PM) errantepiphany: trohovsk: If you want to do anything fancier in Drools, you should probably create a helper class, or a drools function, or similar, that executes the service reference.<br /> (04:11:55 PM) kcbabo: errantepiphany: agree - part of this is using functionality that makes sense for a given implementation type<br /> (04:12:20 PM) kcbabo: errantepiphany: we shouldn't force a round peg into a square hole for some of these use cases<br /> (04:13:31 PM) errantepiphany: kcbabo: we could create a static function that could be imported by drl code that wanted to use it. They would just have to use "import function" in their drl: <a href="http://goo.gl/NrmNCc" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://goo.gl/NrmNCc</a><br /> (04:15:07 PM) errantepiphany: kcbabo: that could be a way of in-out vs. just in-only meps from drl.<br /> (04:17:04 PM) kcbabo: errantepiphany: possible - functions appear to require compilation as part of building the knowledge package<br /> (04:17:27 PM) kcbabo: errantepiphany: so class path would have to be managed in that case<br /> (04:17:43 PM) kcbabo: errantepiphany: actually, the timing of the compilation is an assumption on my part<br /> (04:17:59 PM) kcbabo: errantepiphany: I guess it could happen at runtime as well, but the same consideration applies<br /> (04:18:22 PM) errantepiphany: kcbabo: True. And really, creating a function isn't that hard to do in regular code. and people could just reuse the SwitchYardServiceInvoker (which both our Channel and WorkItemHandler impls reuse).<br /> (04:18:36 PM) kcbabo: errantepiphany: I guess the idea would be that the function returns the body of the out message<br /> (04:18:46 PM) errantepiphany: yup<br /> (04:18:49 PM) kcbabo: errantepiphany: which could grow into asking for context properties as well<br /> (04:19:06 PM) kcbabo: I don't think we could make an assumption on which parts are actually inserted as facts<br /> (04:19:08 PM) errantepiphany: kcbabo: or the function could return the Exchange<br /> (04:19:24 PM) kcbabo: so that's something that the user would have to do in their RHS code once they get the result<br /> (04:19:34 PM) errantepiphany: kcbabo: or we just stay out of making assumptions, and people write their own functions… <img class="emoticon" src="https://issues.jboss.org/images/icons/emoticons/wink.gif" height="16" width="16" align="absmiddle" alt="" border="0" /><br /> (04:19:43 PM) kcbabo: right <img class="emoticon" src="https://issues.jboss.org/images/icons/emoticons/smile.gif" height="16" width="16" align="absmiddle" alt="" border="0" /><br /> (04:20:08 PM) errantepiphany: kcbabo: That's the problem with creating this stuff for specific use-cases. They make sense for some people, but not everyone. And assumptions are dangerous.<br /> (04:20:31 PM) kcbabo: errantepiphany: agreed</p>
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