Chapter 18. Creating the HA CEP client
You must adapt your CEP client code to communicate with the HA CEP server image. Use the sample project included in the reference implementation for your client code. You can run your client code inside or outside the OpenShift environment.
Procedure
-
Download the
rhpam-7.9.1-reference-implementation.zip
product deliverable file from the Software Downloads page of the Red Hat Customer Portal. -
Extract the contents of the file and then uncompress the
rhpam-7.9.1-openshift-drools-hacep-distribution.zip
file. -
Change to the
openshift-drools-hacep-distribution/sources
directory. -
Review and modify the client code based on the sample project in the
sample-hacep-project/sample-hacep-project-client
directory. Ensure that the code fulfills the additional requirements described in Chapter 19, Requirements for HA CEP client and server code. To update the KJAR version in an implementation that uses the method described in Chapter 17, Implementing the HA CEP server with a Maven repository for updating the KJAR service, add an
UpdateKJarGAV
call to the client, similar to the following code:TopicsConfig envConfig = TopicsConfig.getDefaultTopicsConfig(); Properties props = getProperties(); try (RemoteStreamingKieSession producer = RemoteStreamingKieSession.create(props, envConfig)){ producer.updateKJarGAV("org.kie:fake-jar:0.1"); }
Ensure that a KJAR with the specified GAV is available in the Maven repository when this call is executed.
In the
sample-hacep-project/sample-hacep-project-client
directory, generate a keystore, usingpassword
as a password. Enter the following command:keytool -genkeypair -keyalg RSA -keystore src/main/resources/keystore.jks
Extract the HTTPS certificate from the OpenShift environment and add it to the keystore. Enter the following commands:
oc extract secret/my-cluster-cluster-ca-cert --keys=ca.crt --to=- > src/main/resources/ca.crt keytool -import -trustcacerts -alias root -file src/main/resources/ca.crt -keystore src/main/resources/keystore.jks -storepass password -noprompt
-
In the
src/main/resources
subdirectory of the project, open theconfiguration.properties
file and replace<bootstrap-hostname>
with the address that the route for the Kafka server provides. Build the project using the standard Maven command:
mvn clean install
Change the
sample-hacep-project-client
project directory and enter the following command to run the client:mvn exec:java -Dexec.mainClass="org.kie.hacep.sample.client.ClientProducerDemo"
This command executes the
main
method of theClientProducerDemo
class.