Can anyone give me a sample source code where i can use restful jax-rs web service as an interface to message broker using active mq. The requirement is traffic comes to application through jax-rs webservice and the message is transferred to active mq which is processed asynchronously and the consumer on active mq inserts data into db. Can anyone please provide sample code, that would be great
The question is very fuzzy. There are multiple concerns to take into account when doing this kind of interfaces as jax-rs is a http interface (synchronous, non transcational, non persistent, non guaranteed delivery) while activemq (jms) is the other way around, asynchronous, transactional and persistent.
I suggest you take a look at Apache Camel which is a lightweight integration framework that works really good with ActiveMQ. It supports JAX-RS as well. There are multiple code examples over at the Camel website and connecting rest with activemq is rather easy given you have your case fully designed.
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I want to consume Salesforce Outbound Message using Spring and process them sequentially and persist the data in MySQL database. Also I have to send a success response back to Salesforce after processing. I have the WSDL from Salesforce.Could any one provide me an approach on which Spring framework to use. Any examples or links would help me great.
Since you gave WSDL, that means you work with SOAP WebService.
For this purpose Spring Integration provides WeService Adapters support: http://docs.spring.io/spring-integration/docs/4.3.7.RELEASE/reference/html/ws.html
What you need is called WebService Inbound Gateway and here is some sample: https://github.com/spring-projects/spring-integration-samples/tree/master/basic/ws-inbound-gateway
For storing data into RDBMS you need JDBC adapters: http://docs.spring.io/spring-integration/docs/4.3.7.RELEASE/reference/html/jdbc.html
And here is a sample: https://github.com/spring-projects/spring-integration-samples/tree/master/basic/jdbc
I am new to apache kafka and apache spark. I want to integrate the kafka with my angularjs code. Basically I want to make sure that, when a user click on any link or searches anything on my website, then the those searches and clicks should be triggered as an event and send it to the kafka data pipe for the use of analytics.
My question is how can I integrate frontend code which is in angular.js to apache kafka?
Can I send the searches and click stream data directly to apache spark using kafka pipeline or do I need to send those data to kafka and apache spark will do polling to kafka server and receive the data in batches?
I don't think (just cannot find at glance) there is Kafka client for front-end JavaScript. I cannot actually imagine stable setup when millions of producers (each client's browser) writing to the same Kafka topic.
What you need to do in Angular, is to call your server side function to log your events in Kafka.
Server side code may be written in a bunch of languages, including JavaScript for node.js.
Please take a look for available clients at Kafka Documentation
Update 2019: There are several projects implementing REST over HTTP(s) proxy for producer and consumer interfaces. For example Kafka Rest project (source). Never tried these by myself though.
Could anybody explain how Apache Camel is able to behave as a routing and mediation engine on a JAXRS API?
As far I've being reading about I've not been able to figure out what's it for?
You can consider Apache Camel as a great integration framework. It doesn't provide functionality itself, but it makes easy to glue multiple services and protocols together.
Apache Camel can expose a REST endpoint using the CXFRS component. This means it listens for a REST call on certain endpoint (URL). On invocation it doesn't invoke the implementing bean (service) itself, but executes a defined mediation route (invoke a route with its Exchange object).
It is very useful when you need to integrate multiple services or translate the call to other protocols. You can implement a REST service by a bean itself and it's ok until the bean provides some functionality or data itself. For integration you often need more flexibility to integrate multiple sources and protocols. Then Apache Camel can be much more practical tool.
I am still struggling with undertsanding some of Camel's main features and limitations.
My objective is to implement a demo application that can migrate camel endpoints. To achieve this everyone suggested that I should use the camel load-balancer pattern with the failover construct.
To achieve this objective people have suggested Fuse and ActiveMQ. Some have even suggested JBoss, but I am lost.
I understand that Camel needs the an implementation of a JMS server. To achieve this I can use ActiveMQ - a free implementation of a JMS server.
However camel also provies the jms-component. What is this? Is this a client implementation of JMS? If so, should I not be using an ActiveMQ client for JMS? Could someone provide a working example?
With ActiveMQ and JMS understood I can then try to find out why people suggest Fuse. I want my implementation to be as simple as possible. Why do I need Fuse? The Camel+ActiveMQ combination has the load balancer pattern with the failover mechanism right?
I am lost in this sea of new technologies, if someone could give a direction I would be thankful.
Camel provides two components. The first is the jms component, which is a generic API for working against JMS servers. The other is the activemq component, which uses the activemq API for working with activemq message brokers. The activemq component is the default component within things like servicemix/fuse, using an internal broker (not a networked/external broker).
If you are connecting to activemq, you can use either the activemq component or the jms component. The jms component will not start up a broker automatically, you would need to do this yourself.
Fusesource == JBoss Fuse == Apache ServiceMix + some addons. For argument sake, i'm going to refer to all three of these as ServiceMix.
ServiceMix is an enterprise service bus, you can lookup the term on wikipedia if you're not familiar with the concept. It uses Apache Camel to define routes between your components, implementing a number of integration patterns as you so need. ServiceMix deploys by default with Apache CXF, for JAX-RS and JAX-WS services and Apache ActiveMQ, a JMS message broker. Using Camel, you can tell service mix that when a REST API is called, do a series of steps, each step decoupled from the one before it.
JBoss Fuse (the enterprisey, costs money edition) comes with some additional components around fail over. Some of these are present in servicemix (namely, you can run servicemix in a hot stand by mode, waiting for the primary to go down). The Camel load balancer pattern doesn't really mean anything around replication, except that a message coming from one endpoint can be delivered to any of a set of a N endpoints. http://camel.apache.org/load-balancer.html
On the flipside, take a look at ServiceMix's failover http://servicemix.apache.org/docs/4.4.x/users-guide/failover.html
I think based on your question you're referring to system failure failover (needing to work against a new instance), and not a Camel Loadbalancer component (which is likely where the confusion is coming from, on the community side and your side).
start by reading these...Camel In Action, ActiveMQ In Action
in CXF is it possible to publish and subscribe Multiple Web Services one JMS queue ?
It is possible.
The behavior depend of the jms agent and configuration you use. But, if you want to do asynchronous WS over a broker this ability can be necessary.
You can look here asynchronous-client-http-transport for more information on this.
The multi-ws on one queue can be usefull for some case of failover service or reporting.
If its become too complex you can look at camel camel examples page, to control finer patterns.