APACHE SERVICEMIX TUTORIAL PDF
The good Tutorial i found is ServiceMix Tutorial. Here are 2 examples, one JBI and one OSGI, that you can use to start you first SOAP web-service and deploy it . Apache ServiceMix is a runtime container for service-oriented architecture components, web services or legacy system connectivity services. ServiceMix is the container where all the magic happens. Once you have built your bundles running camel, Apache ActiveMQ, Apache CXF etc.
|Published (Last):||23 May 2018|
|PDF File Size:||8.79 Mb|
|ePub File Size:||1.89 Mb|
|Price:||Free* [*Free Regsitration Required]|
Axel Irriger, iteratec GmbH, http: Apache ServiceMix is a runtime container for service-oriented architecture components, web services or legacy system connectivity services. It is one of the most mature, open-source implementations of an enterprise service bus and an Apache top-level project. Before directly starting to discuss what Apache ServiceMix can be used for, a general understanding of the enterprise service bus acronym should be given.
Since it is not a framework suited for everyday usage like Spring, the general context of its application is important. Apache ServiceMix is an implementation of an enterprise service bus in the Java programming language. In a typical enterprise environment, there are several applications apachf. Most probably they are from different vendors and offer very diverse interfaces.
The corporate Servidemix commonly faces two challenges these days:. In the past, these issues were tackled by proprietary product suites, which often were highly specialized and not able to cover a wide range of corporations’ needs.
Hello World with Camel and ServiceMix. part 1.
The development and adoption of web service technology is thought aapache solve these issues, as a common transport and description format now exists. Nonetheless, this needs to be provided, implemented and supported by the applications.
Also, a single call often is not sufficient, but routing and combination logic needs to be employed, as well. To simplify these tasks, Gartner came up with the idea of an infrastructure component, which uses a harmonized way of exchanging data messages and provided such reusable core functionality.
This component should not only exchange messages but also incorporate the ability to route messages from one component to another component. These requirements were bundled into the term “enterprise service bus” ESB. In contrast to enterprise application integration EAIthe ESB concept goes beyond the mere connectivity and data exchange principles and focuses on reuse.
By exposing application functionality to an ESB, new applications can be built that leverage data and services already created. These are then called “composite applications”, as they can be thought off as a meta-level, creating applications from applications, instead of components or frameworks. This functionality can also be leveraged without using an enterprise service bus, but for the typical everyday challenges, a bus greatly simplifies things, since it is prepackaged with components and standard functionality.
It describes all components, which can be found in the ESB concept, matched to Java terminology and interfaces. The JBI standard only focuses on the basic infrastructure: By not reinventing the wheel, a lot of terminology and concepts have been taken from the web services world, such as the supported message exchange patterns.
If you are already familiar with web services development and are not afraid of terminology like “in-only” or “in-out”, the basic ServiceMix messaging concepts will be quite familiar. Using the same terminology does not mean that ServiceMix delivers comparable functionality. The general idea by JBI and ServiceMix is to connect external systems to the bus by converting everything consumed externally to a NormalizedMessage.
This “container” holds the actual data, along with various properties, and the destination endpoint of the message. The job of the bus is to transport the message to its destination.
There, if it shall leave the bus, it is converted back to what is understood by the target system. Within ServiceMix, all components only operate on the NormalizedMessage, which typically contains some sort of XML data, but is not restricted to it. Nonetheless, it is possible to attach binary information to the message, too.
By this, software development gets more standardized and harmonized. Once the data is delivered to the bus, it doesn’t matter where it came from as it is some sort of parseable content already. This sufficiently simplifies development of third party components, which can be hooked into the bus, as these only operate on a NormalizedMessage, too.
This very basic principle, extensibility by open standards, was first introduced by Sun with the J2EE specifications, focusing on the interfaces instead of actual implementations.
In spite of J2EE, a substantial number of components already exist, which can be used by ServiceMix with very little effort. The ServiceMix distribution contains several components. Besides the barebone JBI bus, ServiceMix already ships with a collection of connectivity and routing components.
The most commonly used are:.
All components for external connectivity “binding components” come with prepackaged support for converting external data to and from XML. If this is not the desired behavior, you can customize it by implementing Java classes, which perform the conversion process. The principle idea of a marshaler is, that a JBI component performs a very specific task.
To accomplish this, it is created and it operates only on a NormalizedMessage. To convert data to and from the NormalizedMessage, a specialized class is used, since that is no core functionality of the component and would limit its reusability. Let’s take the file binding component as serviceix example. The core functionality is to read and write files, along with polling in intervals for new files to process.
If a file is to be read, it is the function of the file binding component to lock the file, retrieve its content and send it to the bus, as a NormalizedMessage. To actually interpret the file content, a marshaler is used. Along with these components, you can do sfrvicemix integration servicemxi provide services by wiring together existing services.
Or you can develop something entirely different, which is then published and exposed for usage within the bus itself. But before we come to that, let’s first see how ServiceMix and stuff made with it is deployed. If you want ServiceMix to work for you, the question arises, on how solutions are actually deployed. Besides deploying and running the container itself, it is also important to get your solutions deployed, too.
For this, also two deployment models exist.
The “official” deployment, defined by JBI, is the “service assembly model”. A service assembly is an archive, which essentially contains everything you need to run your solution. This also is the option of choice in order to remain portable across JBI containers.
Router Message: Apache Camel & Service Mix – grokonez
It contains a descriptor of the components the service assembly is made up and, for each of these, how they are configured “service unit”.
If this is too heavy-weight for your environment or need, you can perform a lightweight deployment, which is essentially only a XML descriptor in the standard XBean notation. For simple solutions, or in an embedded use case, this is for sure the easiest way to get up and running. To get into this, we will now take a look at how ServiceMix is being configured. The basic idea is to directly instantiate Java beans by defining XML tags.
These tags are then mapped to Java beans by the framework and populated by Spring. By this, the XML configuration, typically used by Spring does not get that polluted with bean descriptors, but gets a cleaner and more readable syntax. XBean leverages the Spring framework by providing its own ApplicationContext to enable resolution of these beans. In the example above you see a typical Spring configuration file.
At the root element, there are namespace declarations, followed by bean definitions. If you take a look at the definition in bold letters, there is an element specified, which is within the “sm” namespace.
This is a XBean definition. The XML tag “sm: If it fails to look this up, the whole instantiation process will fail.
Otherwise the typical casethis definition is switched to the actual bean during creation of the ApplicationContext. This aoache may have properties, which get set. Either way does refer to setter-methods of the corresponding Java bean. Within ServiceMix, both Spring and XBean are core frameworks for both the development and configuration of the platform.
Therefore, you won’t see any traditional bean definitions in ServiceMix, but you directly deal with somewhat “named beans”. Although this might look a bit strange at first it actually simplifies configuration, as it makes things more readable.
You can still use the traditional Spring syntax, if you like. As described earlier, ServiceMix knows two deployment scenarios for solutions: The biggest difference is the portability issues. With both approaches, you can develop services. With the lightweight mode, you directly wire together service components in a Spring-like fashion, which results in a tightly bound application at least from the perspective of the ApplicationContext.
A configuration of this style does not support hot-deployment, for instance. The JBI way of deployment configures xpache service component separately as a service unit.
All necessary service units are then packaged as a service assembly. This archive is deployed using the ServiceMix deployment service. In this case ServiceMix is not another bean, but used as a runtime servicenix.
In general, if you tend to use ServiceMix in integration-like scenarios, it’s easier to use it the standard way. The deployment overhead seems to be bigger, but the manageability is simplified and you are not bound to a specific product. We will copy a file from directory A to directory B. Although this can be also performed with other frameworks like Apache Camel, it apcahe also be done with ServiceMix.
From the general ESB point of view, this implementation scenario is only a minor one. This gets far more interesting, if you connect legacy systems to the platform and start interacting with these. But to not overcomplicate the sample here, file copy is just fine. Just make sure you keep in mind that this could also be a coupling between Siebel and SAP or some Microsoft Dynamics and a third party web service! To implement this in a lightweight mode, you would create a servicemix.
Upon deployment, ServiceMix will start the components in the order they are declared in this file. To implement this as service assemblies, you need to create a service-unit for the file component, a service-unit for the JMS component and a service assembly unit, which will bundle each of the artifacts together.
The ServiceMix file component allows both the polling of files in directories as also the creation of files in a target directory.