How Mule ESB Works
Mule Enterprise service bus is a lightweight Java-based Enterprise Service Bus and integration platform that allows developers and integrators to connect applications together quickly and easily, enabling them to exchange data. There are two editions of Mule ESB, Community and Enterprise. Mule Enterprise is the enterprise-class version, with additional features and capabilities that are ideal for production deployments of Mule that have requirements for performance. Mule Enterprise Service Bus Community and Enterprise are built on a common code base, so it is easy to upgrade from Mule ESB Community to Mule ESB Enterprise.
Mule ESB enables easy integration of existing systems, regardless of the different technologies that the applications use, including JMS, Web Services, JDBC, HTTP, and many more. The key advantage of an ESB is it allows different applications to communicate with each other by acting as a transit system for carrying data between applications within your enterprise or across the Internet. Mule ESB includes powerful capabilities that include.
- Service creation and hosting: The Service creation and hosting expose and host reusable services, using Mule as a lightweight service container.
- Service mediation: Service mediation shield services from message formats and protocols, separate business logic from messaging, and enable location-independent service calls.
- Message routing: Message routing route, filter, aggregate, and re-sequence messages based on content and rules.
- Data transformation. Data transformation exchange data across varying formats and transport protocols.
When you examine that how a message flows through Mule ESB, you can see that there are three layers in the architecture:
- Application layer
- Integration layer
- Transport layer
Likewise, there are three general types of tasks you can perform to configure and customize your Mule deployment.
Service Component Development: Developing or reuse existing POJOs,
services, Cloud Connectors, or spring beans that contain the business
logic and will consume, process, or enrich messages.
Service Orchestration: Configuring message processors, routers, transformers, and filters that provide the service mediation and orchestration capabilities required to allow composition of loosely coupled services using a Mule Flow. New orchestration elements can also be created and dropped into your deployment.
Integration: A key requirement of service mediation is decoupling services from the underlying protocols. Mule provides transports to allow dispatching and receiving messages on different protocol connectors. These connectors are configured in the Mule configuration and can be referenced from the orchestration layer. Mule supports many existing transports and all the popular communication protocols, but you may also develop a custom transport if you need to extend Mule to support a particular legacy or proprietary system.
Through Mule Enterprise Service Bus, we can integrate third party application like LinkedIn, Twitter, Facebook. To create a Flow we can use Mule Studio, Mule Studio is eclipsed based tool. Mule Studio has three main components: A package tree, a palette, and a canvas. The package tree contains the entire structure of your project. The palette is the source for accessing endpoints, components, transformers, and cloud connectors. A canvas is a graphical editor; you can drag and drop element on the canvas to create a flow.
- Flow Control
- Error Handling
- Cloud Component
We can use this component according to the situation. Generally, endpoints send and receive data, and are responsible for connecting to external resources and delivering messages. The Studio building blocks known as Components fall into three categories: General, Script, and Web Service. General components execute whenever a message is received. Transformers convert message payloads to formats expected by their destinations. Mule ESB provides many standard transformers
Advantages of Mule Studio:
- You can easily create Mule ESB Flows, and edit and test them quickly without a deep knowledge of Mule configuration.
- One of the main advantages of Mule Studio is that you can build Mule ESB Flows in a graphical environment.
- It is based on drag-and-drop element feature and supports two-way editing, config.xml & UI editor.
Mule ESB is most reliable open source and best integration framework with ultimate visibility and control. It can handle services and applications using different transport and messaging technologies. Mule is Java-based, but can broker relations between other platforms such as sockets or.NET using web services.
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