![]() ![]() You can even put this as a default consumer class name in the Beanstalk wrapper in case PARAM1 is not void contextInitialized(ServletContextEvent arg0) Then check the class name such as KinesisApplication so the full name will be. Open the containing class and check the package name, say “”. Take note of the full name of the class that has the run method. Anyway, you probably get the idea with the “run” method: it will start a Worker which in turn will process the Kinesis messages as you implemented the IRecordProcessor.processRecords method. Therefore the easiest implementation is simply to call “run” from “main” but you may have different needs for local execution. When you run it from Beanstalk “run” will be executed first. When you test the KCL app locally then the main method will be executed first. I’ve put mine in the same place as the main method – the “run” method is really nothing else than the KCL application entry point from the Beanstalk wrapper’s point of view. You can put the run method anywhere – or even change its name and the wrapper app implementation will need to follow. In my case I had to pass in a string parameter to the “run” method so I modified the Reflection code to look for a “run” method which accept a single string argument:įinal Class consumerClass = (Class) Class.forName(consumerClassName) įinal Method runMethod = consumerClass.getMethod("run", String.class) Note that you of course change the body of the Kinesis wrapper as you wish. So you’ll need to have a public method called “run” in the KCL app that the wrapper can call upon. ![]() KinesisWorkerServletInitiator.java will look for this method and execute it through Reflection.The class name refers to a class in the Kinesis application that includes a public parameterless method called “run”.PARAM1 is supposed to be a fully qualified class name.It will look for a value in a query parameter called “PARAM1”.The overridden contextInitialized method will be executed automatically upon application start.It is very short and has the following characteristics: ![]() The Source Packages folder includes a single Java file called KinesisWorkerServletInitiator.java. As this particular Apache dependency wasn’t by default available in the Beanstalk KCL wrapper I had to add it to its POM file. Example: in my case one dependency of my KCL app was commons-collections4-4.0.jar. In case your KCL app has some external dependencies on its own then those will need to be part of the wrapper app as well. The wrapper will have all the basic dependencies to run an Amazon app such as the AWS SDK, Jackson, various Apache packages etc. war file will be placed in the “target” folder as expected. If you’re using something else or prefer to run Maven from the command prompt then here’s the mvn command to execute: NetBeans will load the dependencies in the POM file automatically. You’ll see the following folders after opening the project: I personally use NetBeans so the snapshots will show that environment. Once you have cloned it onto your computer you can open with a Java IDE such as NetBeans or Eclipse. zip file and unpack it like you would do with any compressed. zip file that contains the project – you can even rename a. war file extension will be familiar to you. If you’ve done any web-based Java development then the. The wrapper is a very thin Java Maven web application which can be deployed as a. You’ll need to wrap it within a special Kinesis Beanstalk worker wrapper. You cannot simply deploy a KCL application as it is. One possibility is to deploy it on Amazon Elastic Beanstalk. The starting point for this post is that you have a KCL application and want to host it somewhere. If you are developing an application that is meant to process messages from Amazon Kinesis and you don’t know what I mean by a Kinesis app then check out the Amazon documentation on the Kinesis Client Library (KCL) here. This means that you have a method that starts a Worker object in the. library. Suppose that you have a Java Amazon Kinesis application which handles messages from the Amazon message queue handler Kinesis. ![]()
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