[infinispan-dev] Comments on tutorials etc.

Pete Muir pmuir at redhat.com
Tue Jan 25 06:33:19 EST 2011 

On 25 Jan 2011, at 11:09, Galder Zamarreño wrote:

> Rather than sleeping which is a bit rudimentary and might hide problems (even after 10 seconds the cluster might not be formed due to env issues), you could wait until the view contains 2 nodes. IIRC, code that this can be found in the testsuite and radargun too. I think radargun might be a better example since different cache managers run in diff processes, whereas in the testsuite they run in same process. So, the methods, IIRC, are a bit different.

Ok, I will look at that.

> Btw, interesting concept the one of using dependency:copy-dependencies, I hadn't realised of its potential. What do you use -DstripVersion for? To remove version from dependencies being copied?

Yes, it means you just end up with e.g. target/dependency/infinispan-core.jar -- actually probably not really needed in this case, originally I was building the classpath from jar files, and not with a wildcard.

> 
> On Jan 24, 2011, at 8:29 PM, Pete Muir wrote:
> 
>> Galder and I have applied all these changes. I added http://community.jboss.org/wiki/SettingupanInfinispanCluster#43_A_complete_example to handle (15). Would appreciate review by a more experienced person to make sure I have got it right!
>> 
>> Pete
>> 
>> On 18 Jan 2011, at 17:51, Manik Surtani wrote:
>> 
>>> Great feedback, Pete.  +1 to all suggestions here, I've added a few more notes inline with some of the points below.  Feel like making the changes you've suggested?
>>> 
>>> Galder, could you pls help with the Scala-related points?
>>> 
>>> Cheers
>>> Manik
>>> 
>>> 
>>> On 18 Jan 2011, at 16:17, Pete Muir wrote:
>>> 
>>>> As part of getting up to speed with infinispan, I've been running through the docs and tutorials. Some thoughts
>>>> 
>>>> 1) http://www.jboss.org/infinispan/downloads.html
>>> 
>>> +1, along with links to the Infinispan Maven wiki pages for more detailed info.  But definitely +1 for a quick-access copy-and-paste snippet.
>>> 
>>>> 2) http://www.jboss.org/infinispan/downloads.html
>>>> 
>>>> Suggest adding two code snippet for the dependency too:
>>> 
>>> +1 again.  This info is already up there, but +1 for easy to copy snippets.
>>> 
>>>> 3) http://community.jboss.org/wiki/5minutetutorialonInfinispan
>>>> 
>>>> Cache cache = manager.getCache();
>>> 
>>> There were issues with angle brackets on the wiki system, this may have been fixed now.  
>>>> 
>>>> 4) http://community.jboss.org/wiki/5minutetutorialonInfinispan
>>>> 
>>>> To make this totally fool proof, might want to indicate how people can run this, e.g. in a main method on a class. This also really highlights how "lightweight" this stuff is (no need for a big server etc.)
>>> 
>>>> 5) http://community.jboss.org/wiki/5minutetutorialonInfinispan
>>>> 
>>>> For the expiration, might want to adjust the values a bit. 60s is a long time to wait, and also setting the expiration to 60s, and the thread sleep to 60s is risking the assertion failing (it did for me). I would suggest something more like 5s expiration, 10s sleep.
>>>> 
>>>> 6) http://community.jboss.org/wiki/InstallingInfinispantutorialenvironment
>>>> 
>>>> This information is really useful, and I would suggest splitting out the groovy bit and then adding a link from the 5 min tutoiral
>>>> 
>>>> 7) http://community.jboss.org/wiki/InstallingInfinispantutorialenvironment
>>>> 
>>>> Some of the instructions on this page could be clearer if they all built as code blocks. For example, following the groovy ones, I struggled reading the first paragraph, it would have been helpful to split this up and provide code snippets to use like:
>>>> 
>>>> $> cp $INFINISPAN_HOME/infinispan-core.jar ~/.groovy/lib/
>>>> 
>>>> etc.
>>>> 
>>>> 8) http://community.jboss.org/wiki/InstallingInfinispantutorialenvironment
>>>> 
>>>> The location of infinispan-core jars and dependencies has changed from $INFNISPAN_HOME/modules/core to $INIFINISPAN_HOME, the tutorial needs updating
>>>> 
>>>> 9) http://community.jboss.org/wiki/Infinispaninteractivetutorial
>>>> 
>>>> When doing the below line, I get an error:
>>>> 
>>>> And now, create a cache manager indicating the file with the cache definitions.
>>>> groovy:000> manager = new DefaultCacheManager("sample-configurations.xml"
>>>> )
>>>> ===> org.infinispan.manager.DefaultCacheManager at 19cc1b@Address:
>>>> null
>>>> 
>>>> oovy:000> manager = new DefaultCacheManager("/Users/pmuir/Downloads/sample-configurations.xml")
>>>> ERROR java.io.IOException:
>>>> null
>>>>      at org.infinispan.config.InfinispanConfiguration.newInfinispanConfiguration (InfinispanConfiguration.java:264)
>>>>      at org.infinispan.config.InfinispanConfiguration.newInfinispanConfiguration (InfinispanConfiguration.java:282)
>>>>      at org.infinispan.config.InfinispanConfiguration.newInfinispanConfiguration (InfinispanConfiguration.java:136)
>>>>      at org.infinispan.manager.DefaultCacheManager.<init> (DefaultCacheManager.java:243)
>>>>      at org.infinispan.manager.DefaultCacheManager.<init> (DefaultCacheManager.java:229)
>>>>      at groovysh_evaluate.run (groovysh_evaluate:4)
>>>> 
>>>> and I don't know how to get past it, so I stopped this tutorial here.
>>> 
>>> Hmm, could be a missing schema?  Did you enable log4j TRACE level logging to see what was going on?
>>> 
>>>> 10) http://community.jboss.org/wiki/InfinispanInteractiveTutorialwithScala
>>>> 
>>>> Could do with some comments explaining what each line is doing, some of the code isn't self describing
>>>> 
>>>> e.g.
>>>> 
>>>> what does me entering val defaultCache = manager.getCache[String, String]() actually achieve?
>>>> 
>>> 
>>> Galder, care to look into this one?
>>> 
>>>> 11) http://community.jboss.org/wiki/InfinispanInteractiveTutorialwithScala
>>>> 
>>>> It might be neat to split up input and output e.g. into different snippets - make it easier to read
>>>> 
>>>> 12) http://community.jboss.org/wiki/InfinispanInteractiveTutorialwithScala
>>>> 
>>>> For "Cache with Transaction Management" I was not seeing TX semantics being obeyed, I saw the size increment as a added key-value pairs
>>> 
>>> Galder, this as well?
>>> 
>>>> 13) http://community.jboss.org/wiki/SettingupanInfinispanCluster
>>>> 
>>>> When I do gc.setTransportClass(JGroupsTransport.class.getName()); and import JGroupsTransport I get two options, one from Infinispan and one from JGroups, tutorial should saw which to import.
>>> 
>>> It should be the Infinispan one - the fully qualified classname can be seen in the next XML snippet.  Maybe the Java snippet should use the fqcn as well.
>>> 
>>> 
>>>> 14) http://community.jboss.org/wiki/SettingupanInfinispanCluster
>>>> 
>>>> The CacheManager is deprecated, I guess these needs updating to 4.2 API?
>>> 
>>> Yes.
>>> 
>>>> 
>>>> 15) http://community.jboss.org/wiki/SettingupanInfinispanCluster
>>>> 
>>>> I would suggest adding some instructions about how to do a simple test to see the cluster working, atm the tutorial seems to end in middle of something. There are hints in the comment, but nothing concrete
>>> 
>>> Perhaps starting 2 nodes using main() methods, in different terminals, and reverting back to the 5-min tutorial trying stuff on alternate instances?
>>> 
>>> Cheers
>>> Manik
>>> --
>>> Manik Surtani
>>> manik at jboss.org
>>> twitter.com/maniksurtani
>>> 
>>> Lead, Infinispan
>>> http://www.infinispan.org
>>> 
>>> 
>>> 
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>> 
>> 
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> 
> --
> Galder Zamarreño
> Sr. Software Engineer
> Infinispan, JBoss Cache
> 
> 
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