Help with "Getting Started with Data Sources"

[Ty Flowers]

Hi All, 

I am kind of a noob in working with Google Charts, so please bear with me. :) I am trying to create a performance representation using Google Charts with live external data populating a .csv file. In doing so, I have created an Apache Webserver on CentOS 7 and am following this reference from the Google Developers page:

https://developers.google.com/chart/interactive/docs/dev/dsl_get_started

I was successful in configuring the Webserver and have created the associating directories; as well as, copied the lib's per the above reference. As I follow the process, I keep running into a road block when I come to item #9, "~ copy visualization-datasource-1.0.2.jar and visualization-datasource-examples.jar". The reference states that these files should be included in the data source download, which I cloned from git, https://github.com/google/google-visualization-java.git. I looked through all of the directories in this folder and did not find the visualization-datasource-1.0.2.jar and visualization-datasource-examples.jar files. I was able to find the "visualization-datasource-1.0.2.jar from an external source and placed it within the /myWebApp/WEB-INF/lib directory. I tried to bring up the the test browser page pointing to the "getting_started.html" page placed in "/myWebApp" directory and less the visualization-datasource-examples.jar file, and I get a "requested resource not available"..?  

So all of that said, I have a couple question in support of seeking assistance; 

1. Is there an updated library that I need to navigate to that has the visualization-datasouces and visualization-datasource-examples jar files?

2. Is there an easier way to create a webapp to host my live data to present to google charts? 

Any assistance is greatly appreciated. Thank you!

Respectfully, 

Ty Flowers 

[Sergey Grabkovsky]

Hi Ty,

The Java DataSource library is primarily intended to be used as an example of how you should structure your datasource library, as well as some utilities to help you along. Generally, you should build it from source and modify it as you need to. I would think the source for the examples and the library would be more useful than the jar, since the example jar would simply serve some JSON, and that's all you would be able to see.

To answer your questions directly:

1. No, we aren't hosting the jar files anywhere, but it should be fairly trivial (and more useful) to build them from source.

2. My personally preferred way of doing this is to make a Google spreadsheet, and just write some JavaScript that fetches it. Here's the documentation and some examples for doing that.

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Sergey Grabkovsky | SWE  | gra...@google.com

[Ty Flowers]

Hi Sergey, 

Thanks for the response. I was racking my brain, seriously, trying to find that .jar. LOL! With regard to creating a google spreadsheet and writing fetches to the data with java, can this be done with live data? For example, I want to create a real-time graphical output for top, using guages to display stuff like %mem and %cpu used. Can I redirect the "top" output from my system to my google spreadsheet then use java to fetch the data? I'll take a look at the link you gave me and see what I a can whip up... I haven't coded anything in decades so this task I've been given is becoming quite the adventure. Ha! Thanks again for your help!

Respectfully, 

Ty

[Sergey Grabkovsky]

So this wouldn't be trivial by any means, but it can certainly be done, although it's debatable how 'live' it would be.  There would probably be a delay of at least a few seconds between what your computer is actually doing and what the graph is showing, of course depending on how often you update the spreadsheet.

It might be easier to just write a server to do this, as you originally intended, but it could be pretty simple. You'd first have to figure out how to programmatically get the cpu and memory stats in the language of your choice, and then you would have a server that returns them when a request is sent to it. This would reduce the amount of indirection and minimize the delay, showing you actually live information. You could get around without the datasource library, though. But you would still have to implement the same interface. Here the a documentation page for how to implement a data source yourself.

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