i am new to seam,i created seam application in eclipse along with seam generated entities,but I am not able to understand flow of curd operation execution.Can any one please help me
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The problem:
I want to run Selenium Grid on AWS and would like to use their dynamic scaling. On scale down, it will just terminate an instance... which mean that a node can disappear just like that. Not the behaviour I would like, but using scripts or lifecycle hooks, I can try and make sure that any sessions on the node is not active before it is terminated.
Seems like I can hit this API to disconnect the node from the hub: http://NODE-IP:5555/selenium-server/driver/?cmd=shutDownSeleniumServer
Ideally, I need to find an API to the node directly to gather data of session activity.
Alternatives? Sessions logs?
Note:
This answer is valid only for Selenium 3.x series (3.14.1 which is as of today the last of the builds in Selenium 3 series). Selenium 4 grid architecture is a complete different one and as such this answer will not necessarily be relevant for Selenium 4 grid (Its yet to be released).
Couple of things. What you are asking for sounds like you need a sort of self healing mechanism. This is not available in the plain vanilla selenium grid flavor.
Selenium node, doesn't have the capability to track sessions that are running within it.
You need to build all of this at the Selenium Hub (which is where all this information resides in).
On a high level, you would need to do the following
Build a custom proxy by extending org.openqa.grid.selenium.proxy.DefaultRemoteProxy which would have the following capabilities:
Add an API which when used would mark the proxy as quiesced (meaning the node has been marked for maintenance and will no longer accept any new session requests)
Override getNewSession(Map<String, Object> requestedCapability) such that it first checks if a node is not quiesced and only then facilitate a new session.
Build a custom servlet which when invoked can do the following:
Given a node it can use the API built via 1.1 and mark a node as quiesced
would return back the list of nodes that don't have any sessions running in them. If you build your servlet by extending org.openqa.grid.web.servlet.RegistryBasedServlet, within your servlet you should be able to get the list of free node urls by doing something like below
List<RemoteProxy> freeProxies =
StreamSupport.stream(getRegistry().getAllProxies().spliterator(), false)
.filter(remoteProxy -> !remoteProxy.isBusy())
.collect(Collectors.toList());
List<URL> urls =
freeProxies.stream().map(RemoteProxy::getRemoteHost).collect(Collectors.toList());
Now that we have the custom Hub which is now enabled with functionality to do this cleanup, you could now first invoke the 2.1 end-point to mark nodes to be shutdown and then keep polling 2.2 end-point to retrieve all the IP and Port combinations for the nodes that are no longer supporting any test session and then invoke http://NODE-IP:5555/selenium-server/driver/?cmd=shutDownSeleniumServer on them.
That on a high level can do what you are looking for.
Some useful links which can help you get oriented on this (All of the provided links are blogs that I wrote at various points in time).
Self healing grid - https://rationaleemotions.wordpress.com/2013/01/28/building-a-self-maintaining-grid-environment/
Building a custom proxy - https://rationaleemotions.github.io/gridopadesham/CUSTOM_PROXY.html
Building a custom servlet for the hub - https://rationaleemotions.github.io/gridopadesham/CUSTOM_SERVLETS.html
I have a few Nifi process groups which I want to run integration tests on before promoting to production. The issue is that I can't seem to find any documentation on how to do so.
Data Provenance seems like a promising tool to accomplish what I want, however, over the course of the flowfile's lifecycle, data is published to/from kafka or the file system. As a result, the flowfile UUID changes so I cannot query for it using the nifi-api.
Additionally, I know that Nifi offers a TestRunner library to run tests, however, this seems to only be for processors/processor groups generated via code and not the UI.
Does anyone know of a tool, framework, or pattern for integration and unit testing nifi process groups. Ideally this would be a solution where you can programatically compare input/output of the processor/processor group without modifying the existing workflow.
With the introduction of the Apache NiFi Registry, we have seen users promote flows from a development/sandbox environment to a test/QE environment where there are existing "test harness" flows surrounding the "flow under test" so that they can send repeatable and deterministic (or an anonymized sample of real production data) through the flow and compare the results to an expected value.
As you point out, there is a TestRunner class and a whole testing framework provided for unit tests. While it can be difficult to manually translate a UI-constructed flow to the programmatic construction, you could also create something like a translator to accept a flow template or flow.xml.gz file and convert it into something processable by the test framework.
Maybe plumber will help you with flow testing.
We also wanted to test whole NiFi flows, not just single processor, so we created this library and decided to open-source it.
Simple example in Scala:
// read flow previously exported from NiFi
val template = TemplateDeserializer.deserialize(this.getClass.getClassLoader.getResourceAsStream("exported-flow.xml"))
val flow = NifiTemplateFlowFactory(template).create()
// enqueue some data to any processor
flow.enqueueByName("csv row,12,another value,true", "CsvParserProcessor")
// run entire flow once
flow.run(1)
// get the results from any processor
val records = flow.resultsFromProcessorRelation("LastProcessorInFlow","successRelation")
records should have size 1
This library is still under development so improvements and ideas are welcomed! :)
I have a requirement in hand where I need to change the Mule Flow Threading Behavior at runtime without the need of bouncing the whole Mule Container. I figured out few different ways to achieve this, but none of them are working.
I tried accessing the Mule Context Registry and from there I was trying to do a lookup of "FlowConstructLifecycleManager" Object so that I can tap in there and access the threading profile of the object and reset those values, then stop and start the flow programmatically in order to get the change applied in the flow. I am stuck in this approach as I was unable to get hold of the FlowConstructLifecycleManager Object neither from the Mule Spring Registry nor from the Transient Registry. I was able to get hold of the Flow object though which has a direct reference to that FlowConstructLifecycleManager Object. But, unfortunately, they made this object as protected and didn't expose any method for us to access this object.
Since I was unable to access this FlowConstructLifecycleManager directly from Mule implemented Flow class, I decided to extend this Flow class and just add another public method to it so that I can access FlowConstructLifecycleManager object from Flow object programmatically. But, I am stuck in this approach as well as even if I am putting my version of the same Flow class packaged and dropped in lib/user folder of the container, it is still not picking up my version of the class, and loading the original version instead.
It would be of great help if I can get any pointer on the approach of solving either my first or second problem.
Thanks in advance,
Ananya
In our company, we are building a dashboard from where we should be able to start/stop any flow or change the processing power of any flow by increasing/ decreasing the active threads for a flow or changing the pollen polling frequency. All of these should be done at runtime without any server downtime.
Anyway, I made it working finally. I had to patch up the mule-core jar and expose few objects so that I can get to the thread profile object and tweak the values at runtime and stop/ start the flow to reflect the changes to take effect. I know this is little bit messy and but it works.
Thanks,
Ananya
I have a process diagram that directs flow on the basis of threshold variables. For example, for variable x,y; if x<50 I am directed to service task 1 , if y<40 to service task 2, or if x>50 && y>40 to some task..
As intuition tells, I am using compare checks on sequence flow to determine next task.
x,y are input by user but 50, 40 (Let's call these numbers {n}) is a part of process definition(PD).
Now, for a fixed {n} I have deployed a process diagram and it runs successfully.
What should I do if my {n} can vary for different process instances? Is there a way to maintain the same version of process definition but which takes {n} dynamically?
I read about BPMN Model API here. But, I can't seem to figure out how to use it to edit my PD dynamically? Do I need to redeploy it each time on Tomcat or how does it work?
If you change a process model with the model API you have to redeploy it to actually use it. If you want to have a process definition with variable {n} values you can also use a variable for it and set it during the start of the process instance either using the Java API, REST API or the Tasklist.
Hi I am working on jBPM 6.2.0.
I need to send a Velocity Template Email Notification, upon Human Task creation. Do I need to write a separate Email Notiification Handler ? And how do I make sure it gets called in task Creation.
Please Note: Performance is an issue for us, we need to complete execution of each task in less than 1 sec.
Tech Stack:
jBPM 6.2.0.Final
Oracle 11g
Java 1.7
Any help is appreciated.