I am currently trying to write an Elasticsearch plugin (mainly for testing purposes), and I am struggling with the documentation which simply states:
These examples provide the bare bones needed to get started. For more information about how to write a plugin, we recommend looking at the plugins listed in this documentation for inspiration.
So basically, after finding a few tutorials (which kind of disagree with each other besides the maven part), see http://david.pilato.fr/blog/2016/07/27/creating-a-plugin-for-elasticsearch-5-dot-0-using-maven/ and http://jfarrell.github.io (they don't inherit the same classes).
I am actually stuck where to start, what components are available from the core elasticsearch dependency, and how should I load my plugin. (I know I can look into it by testing and retro engineering, I just wondered if anyone had good tips regarding the topic).
For now my code just looks like:
public class MyPlugin extends Plugin implements NativeScriptFactory{
//overriden methods
}
Where should I go from there?
Thank you very much!
#asttouf
I recently wrote a plugin to EL 2.3.x (https://github.com/betorcs/elastic-recurring-plugin). It was hard to find a documentation saying steps to follow to write it. I needed to google at lot to find some references.
I'm listing some projects I used as reference, i hope they can help you.
https://github.com/elastic/elasticsearch/tree/master/plugins/ingest-attachment
https://github.com/elastic/elasticsearch-mapper-attachments
https://www.elastic.co/blog/found-writing-a-plugin
http://www.flax.co.uk/blog/2016/01/27/fun-frustration-writing-plugin-elasticsearch-ontology-indexing/
EDITED
More references:
https://www.elastic.co/guide/en/elasticsearch/reference/5.0/modules-scripting-native.html
https://www.elastic.co/blog/writing-your-own-ingest-processor-for-elasticsearch
Plugin updated to support ES 5.0, check out https://github.com/betorcs/elastic-recurring-plugin/tree/5.0
Related
I'm creating some rules to SonarQube where it will analyze a Android Project and raise some Security vulnerabilityes points on code.
I've already created a custom rule by Sonar Tutorial to create my own rules following the same structure, but I had some complications. For instance, when I tryed to run the test classes, I've found some problems to identify Android Classes and validate my rule, and after some research, I solved the problem, but seems like when I put my plugin on SonarQube and run it, the problem remains with the tool not identifying Android Classes (I coudn't comprove this because coudn't find a way to debug the web tool and see why the Rule is not checking).
By this, I need to know if I'm really doing this of the right way. Analyze with custom rules a Android Project directly by SonarQube can be done just following the Sonar Tutorial? Do I need of custom configurations inside my template or any other step to do it?
If beyond the answer or the instruction, someone could provide some documentation to help me, I would be deeply grateful.
Since now, thanks for your attention!
I would like to build out a set of triggers in my database using TransactionEventHandler() functionality.
However I haven't found a working example of this for version > 3.0. I did see an example by maxdemarzi however it doesn't appear to be working in recent versions of neo4j.
If anyone has any experience with this I would really appreciate the help!
Side Note: I do realize APOC has some alpha functinality around triggers using cypher. At the moment it isn't fully fledged and I have run into some issues using it. Thus I'm looking at implementing my own plugin to handle my particular use case.
After reaching out to maxdemarzi on github he has updated his example to support neo4j v 3.1.
See the repo here: https://github.com/maxdemarzi/neo_listens
I just finished my Full version on my app. I am now looking around trying to figure out how to make my Lite version of the app. Not a whole lot is different but there are differences especially when you are playing the trivia game. How do I go about managing both of these versions in Eclipse? I looked at this guide:
http://blog.donnfelker.com/2010/08/05/howto-android-full-and-lite-versions/
But it seems like the linked tutorial is outdated based on the comments below the tutorial about adding Proguard to the code. There has to be an easy way to do this. Is the best way still to make 3 projects like the above linked tutorial says but just find away to get around the Proguard issue?
Not sure if this counts as an answer but I have positive experiences from using library projects when creating dual version Apps like free/pro, lite/paid or whatever you choose to call them.
You can separate the differences in logic either by using simple if-statements, like if(AppType.isFree(context)) where in the helper method you check if the context package is that of the free or paid version.
Or by using inheritance and interfaces to take advantage of polymorphism and dynamic binding.
For example the menu activity in your lib might invoke a getGameActivity, which depending on sub class (free or paid) returns the appropriate version of the game and where most of the logic is in the abstract lib GameActivity class.
And about ProGuard, if you are not very afraid of reverse engineering, it's not really necessary to bother with it.
Currently we are studying the Java based tool which is primarily Reporting tool.It was developed in 2000/2001 period and uses many open source libraries like Apache Avalon/Mx4J.Adaptor/edu.Oswego(java concurrent package) etc. Tool uses jdk 1.3.1 and goal is to upgrade to jdk 1.5.We have also been asked to remove these 'outdated' packages and replace by standard Java packages if possible.
Unfortunately we have the code available for study but lacks any documentation and really difficult to track the flow(Total number of classes written might be more than 1000) during debugging.
Whats the best way to understand this kind of tool? Any graphical tool to see the relationship between the classes?
Thanks,
SR
You could try some of the Source Code Analyzer plugins to eclipse. Tools like DIVER or X-Ray might be useful.
That's a common problem (unfortunately), and again unfortunately there is no easy solution.
There are many tools to help you (see below), but these are only helpers, they will not solve the problem for you.
I have found that a systematic approach is best. There is a good article on this:
Swallowing an elephant in 10 easy steps , about understanding a large, undocumented system. It's about Perl, but the ideas are independent of language.
Some tools that might help:
Step through interesting parts in a debugger (e.g. Eclipses debugger)
Use Eclipse's "Call hierarchy" and "find references" to understand which part of the code uses what
Run tests with simple input data, understand what they produce
Write javadocs into the code documenting what you found, possibly correcting existing docs
Use tools to visualize class dependencies. I have unsed JDepend with some success; there are many others.
Eclipse (and newer version of NetBeans and perhaps IntelliJ) have wonderful tools for analyzing large codebases:
Call hierarchy (CTRL + ALT + H) - you see the hierarchies of calls to/from a given method
Type hierarcy (F4) - you see the whole inheritance structure
Data hierarchy
Right click on item > References
many different search options
Any graphical tool to see the relationship between the classes?
If you want to see the relationship between classes you could try Green UML . It creates a nice UML class diagram out of your repository. It works on Eclipse.
I hope that helps.
You can do it easily in NetBeans.
Select the method signature and press ALT+F7 (or alternately right click and then click "Find Usages") this would show you from where a particular method is being called.
Second option is little hectic but may give some results. Configure log4j for your project and try to give the proper logging code in each method.
I often read about dependency injection and I did research on google and I understand in theory what it can do and how it works, but I'd like to see an actual code base using it (Java/guice would be preferred).
Can anyone point me to an open source project, where I can see, how it's really used? I think browsing the code and seeing the whole setup shows me more than the ususal snippets in the introduction articles you find around the web. Thanks in advance!
The Wave Protocol Server is my favourite example app.
I struggled a bit with this exact issue. It's so abstract and simple I was always worried I was "doing it wrong".
I've had been using it in the main project which has dependencies on other projects because the Guice module which sets the bindings was part of the main project.
I finally realized the libraries should be supplying the Modules themselves. At that point you can depend only on an instance of a Module (not a specific one), and the interfaces that are bound by it.
Taking it one step better, you can use the new ServiceLoader mechanism in Java 6 to automatically locate and install all Guice modules available on the classpath. Then you can swap in dependencies just by changing class path (db-real.jar vs. db-mock.jar).
I understand you're in Java-land, but in the .NET space the are several open-source apps written using an inversion of control container. Check out CodeCampServer, in which the UI module doesn't have a reference to the dependency resolution module. There is an HttpModule that does the work. (an HttpModule is just a external library you can plug in that handles events in ASP.NET, in CodeCampServer the UI project loads this DependencyRegistrarModule at run time, without any compile time reference to it.)
I think dependency injection has a way of disappearing from view if used properly, it will be just a way of initializing/wiring your application -- if it looks more fancy than that you are probably looking at extra features of the framework at hand, and not at the bare-bones dependency injection.
Edit: I'd recommend actually starting to use it instead of trying to find examples, and then come back and post questions here if you can't get stuff to work like you'd think it should :-)