. 9, Apache ServiceMix is designed on top of the OSGI specification. Using OSGI .. aracer.mobi"/>
In that time, we'll install ServiceMix on your machine, deploy some Before we can start working with Apache ServiceMix, we have to get it installed and running . The ServiceMix Bean component provides integration with beans (POJOs) with the JBI bus to aracer.mobi">. 9, Apache ServiceMix is designed on top of the OSGI specification. Using OSGI .. aracer.mobi
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Jan 13, Apache Karaf started life as the Apache ServiceMix kernel and then . osgi: install -s mvn:aracer.mobis/ manual restart. PDF for easy Reference. Written by Deployment of ServiceMix 4 Components ServiceMix, an Apache project, has been around for a couple of years now. Apache Camel Tutorial—EIP, Routes, Components, Testing, and More. Oct 19, Enterprise Service Bus. ▫ Java Business Integration. ▫ Apache ServiceMix ESB. ▫ ServiceMix 4. Colorado Software Summit: October 19 –
ServiceMix NMR: This component, a normalized message router, handles all the routing of messages within ServiceMix and is used by all the other components. Web: ServiceMix 4 also provides a web component.
You can use this to start ServiceMix 4 embedded in a web application. An example of this is provided in the ServiceMix distribution.
This layer provides compatibility with the JBI specification, so that all the components from the previous version of ServiceMix can run on ServiceMix 4. Be sure though to use the You can use the endpoints provided by the ServiceMix NMR, but you can also use more advanced routing engines. One of those is the Camel NMR. This component allows you to run Camel based routes on ServiceMix. In short an OSGi container provides a service based in-VM platform on which you can deploy services and components dynamically.
OSGi provides strict classloasing seperation and forces you to think about the dependencies your components have. Besides that OSGi also defines a simple lifecycle model for your services and components.
This results in an environment where you can easily add and remove components and services at runtime and allows the creation of modular applications. An added advantage of using an OSGi container is that you can use many components out of the box: remote administration, a web container, configuration and preferences services, etc. Before we move on to the next part, let's have a quick look at how a message is processed by ServiceMix.
The following figure shows how a message is routed by the NMR.
In this figure you can see a number of steps being executed: The consumer creates a message exchange for a specific service and sends a request. The NMR determines the provider this exchange needs to be sent to and queus the message for delivery. The provider accepts this message and executes its business logic. After the provider has finished processing, the response message is returned to the NMR.
The NMR once again queues the message for delivery. This time to the consumer. The consumer accepts the message. After the response is accepted, the consumer sends a confirmation to the NMR. The NMR routes this confirmation to the provider, who accepts it and ends this message exchange.
Now that we've seen the architecture and how a message is handled by the NMR, we'll have a look at how to configure ServiceMix 4. Section 3 Configuration of ServiceMix 4. Let's look at two simple examples. A poller is one of the standard components that is provided by ServiceMix's file-binding-component.
If we deploy this configuration to ServiceMix, ServiceMix will start polling the inbox directory for files.
If it finds one, the file will be sent to the specified targetService. Service Addressing An important concept to understand when working with ServiceMix is that of services and endpoints. When you configure services on a component you need to tell ServiceMix how to route messages to and from that service. Apache ServiceMix console Now that we successfully installed and started Apache ServiceMix, we'll take a closer look at the console.
This is where you manage your ServiceMix instance, add and remove bundles, install optional features, Working with bundles When ServiceMix is first started, a whole set of bundles providing the core features for the product are being installed.
Let's use the command console to find out more about them The osgi:list command can be used to get a list of all bundles currently installed. An example: to look for all Camel related bundles Working with logging Many of the applications you write will have some form of log output. To look at the message in the log file, you can us the log:diplay command.
If you're only interested in the latest exception in the log file, you can use log:display-exception instead. You can also change the log level at runtime by using the log:set command. You can try these commands on your instance now by first setting the log level to DEBUG and then using grep to make sure that you can actually see the extra logging. There are a lot more commands in the shell to help you deploy, monitor, manage and troubleshoot the applications you're building with ServiceMix.
Using Camel Now that we know how to operate Apache ServiceMix through the shell console, it's time to start using it for what it is built for. Let's build our very first integration solution with a Camel route and deploy it on ServiceMix. To ensure we can keep track of which files get moved, we'll also write a message to the log file whenever we move a file. The file will get picked up and deployed by ServiceMix. In the menu bar, open "Windows" and click "Preferences" The "Preferences" window will pop-up.
Click on the "Java" plus sign and change to "Compiler". Compiler compliance level must be 5.
Check the "Use default compliance settings" box. Click on "New" button to right A pop-up appears.
The necessary build takes around three minutes. Running an Example Now you can run an example: In the Package Explorer find the Main class, which should be located in org. From the Run menu select "Run Click on "Arguments" tab: In the "Program Arguments" box enter servicemix.