various-demo | Everything from hello world | Build Tool library
kandi X-RAY | various-demo Summary
kandi X-RAY | various-demo Summary
Everything from hello world.
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Top functions reviewed by kandi - BETA
- Starts the given method .
- Writes the object .
- Loads a serializer for the given class .
- Reads an object .
- Flush the http request .
- Initialize the serializer files .
- Opens the transport .
- Guess a TJSON Protocol factory from a byte array .
- Deserialize a field .
- Reads an event .
various-demo Key Features
various-demo Examples and Code Snippets
Community Discussions
Trending Discussions on various-demo
QUESTION
I am trying to do geofence monitoring/analytics using KSQLDB. I want to get a message whenever a vehicle ENTERS/LEAVES a geofence. Taking inspiration from the [https://github.com/gschmutz/various-demos/tree/master/kafka-geofencing] I have created a UDF named as GEOFENCE, below is the code for the same.
Below is my query to perform join on geofence stream and live vehicle position stream
...ANSWER
Answered 2020-Jun-16 at 11:55Would it be correct to say that the join_live_pos_geofence_status_1 stream can have rows that go from INSIDE -> OUTSIDE and then from OUTSIDE -> INSIDE for some key value?
And what you're wanting to do is to output LEAVING and ENTERING events for these transitions?
You can likely do what you want using a custom UDAF. Custom UDAFs take and input and calculate an output, via some intermediate state. For example, an AVG udaf would take some numbers as input, its intermediate state would be the number of inputs and the sum of inputs, and the output would be count/sum.
In your case, the input would be the current state, e.g. either INSIDE or OUTSIDE. The UDAF would need to store the last two states in its intermediate state, and then the output state can be calculated from this. E.g.
QUESTION
I am implementing a KSQL UDF which will detect whether a given (lat, lon) pair lies within a geofence (many lat-lon pairs forming a polygon) or not. I have taken inspiration from this project (https://github.com/gschmutz/various-demos/tree/master/kafka-geofencing) and written my own JAVA Class (see below) with limited functionality that I require.
...ANSWER
Answered 2020-Mar-26 at 14:53There were 2 issues in this: 1. I was using mvn clean install but doing mvn clean package did the right export of the uber-jar. 2. Some of the dependencies listed in pom.xml were signed jars so they were throwing Java Security Exception when this UDF jar was uploaded into ksql-server. Following the solution present on the below mentioned links helped me in resolving this issue as well. [What is the maven-shade-plugin used for, and why would you want to relocate Java packages? [http://zhentao-li.blogspot.com/2012/06/maven-shade-plugin-invalid-signature.html]
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install various-demo
You can use various-demo like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the various-demo component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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