https://code.google.com/archive/p/json-simple/
<https://code.google.com/archive/p/json-simple/>
import org.json.simple.JSONObject;
void main() {
String yourString;
String key;
JSONObject j = yourString;
Redis.put(key,j);
}
—
Henry Hottelet
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> On May 16, 2016, at 4:11 AM, Daniela S <daniela_4...@gmx.at> wrote:
>
> Henry,
>
> thank you for your help. I did not use any github link for my project. I
> tried to build the project on my own, with the help of some books and
> available code parts from the Internet. I try to explain what I am doing:
>
> 1. I have generated random JSON data with a JSON data generator from the
> Internet
> the JSON data looks as follows:
> {"timestamp": "nowTimestamp()",
> "ID1": "integer(1,1000)",
> "ID2": "integer(1,100)",
> "command": "random('START','END')"
> }
> The JSON generator simulates a data stream, sending the data to a specific
> Kafka topic as String
>
> 2. I would like to have a KafkaSpout to fetch the data from the Kafka topic.
>
> 3. Then I would like to store all the events containing "START" into Redis
> and to delete all the events containing "END" from Redis. The key should be a
> combination of ID1 and ID2.
>
> 4. In the next step I would like to pull all the entries stored in Redis and
> to add a specific value for every entry (this values is located in a database
> and I have to look it up for every entry). Then I would like to use these
> values to build a sum over all entries. This should be repeated every minute,
> as there might have been new start or end events. I thought I could use a
> sliding window for that.
>
> But unfortunately I have no idea how to proceed with the JSON String, I
> receive from Kafka. I already read a lot about the possibility to store JSON
> Strings in Redis, but I have no idea how to build the key with both IDs and
> how to access the fields in the JSON String.
>
> Hope you can help me.
>
> Thank you so much in advance!
>
> Regards,
> Daniela
>
>
>
> Gesendet: Sonntag, 15. Mai 2016 um 22:07 Uhr
> Von: "Henry Hottelet" <hotte...@gmail.com>
> An: user@storm.apache.org
> Betreff: Re: Aw: Re: Split Kafka JSON String
> Daniella,
>
> I am curious about your architecture with Kafka and storm. Can you send the
> github link you used for that project?
>
> I would like to be able to see your example. I use IntelliJ.
>
> Henry
>
> Sent from my iPad
>
> On May 15, 2016, at 2:14 PM, Daniela S <daniela_4...@gmx.at
> <x-msg://7/daniela_4...@gmx.at>> wrote:
>
> Hi,
>
> thank you very much for your answers. But unfortunately I do not have a JSON
> object yet, I only have a String, containing a JSON object. I receive the
> Strings from Kafka but I do not know how to get the information out of the
> String.
>
> example: {"timestamp": 1463335828342, "ID":570,"command":"START"}
>
> I would like to extract the three fields out of the String. Then I would like
> to store it into Redis.
> Afterwards I would like to pull all the stored (active) devices out of Redis
> and to build a sum over all the devices every minute. For building the sum I
> have to add another value for every device. I would like to use Redis as a
> kind of cache.
>
> Regards,
> Daniela
>
> Gesendet: Sonntag, 15. Mai 2016 um 20:06 Uhr
> Von: "Henry Hottelet" <hotte...@gmail.com <x-msg://7/hotte...@gmail.com>>
> An: user@storm.apache.org <x-msg://7/user@storm.apache.org>
> Betreff: Re: Split Kafka JSON String
> Try using intellij plug in that converts json to pojo classes
>
> On May 15, 2016 2:04 PM, "Nathan Leung" <ncle...@gmail.com <>> wrote:
> Easiest way is to map your job to a pojo and use Jackson or gson to convert
> the json.
>
> On May 15, 2016 1:48 PM, "Daniela S" <daniela_4...@gmx.at <>> wrote:
> Hi
>
> I am receiving Strings of JSON from Kafka. I would like to split the string
> to get each field from the JSON object to store it into Redis.
> How can I split the string and assign the parts to variables?
>
> Thank you in advance.
>
> Regards,
> Daniela
