8.9. Multi-Device Broker ( Specialized Cloud Mechanisms Unit 3 chapter 1)

8.9. Multi-Device Broker


An individual cloud service may need to be accessed by a range of cloud service consumers differentiated by their hosting hardware devices and/or communication requirements. To overcome incompatibilities between a cloud service and a disparate cloud service consumer, mapping logic needs to be created to transform (or convert) information that is exchanged at runtime.
The multi-device broker mechanism is used to facilitate runtime data transformation so as to make a cloud service accessible to a wider range of cloud service consumer programs and devices (Figure 8.35).

Figure 8.35. A multi-device broker contains the mapping logic necessary to transform data exchanges between a cloud service and different types of cloud service consumer devices. This scenario depicts the multi-device broker as a cloud service with its own API. This mechanism can also be implemented as a service agent that intercepts messages at runtime to perform necessary transformations.
Multi-device brokers commonly exist as gateways or incorporate gateway components, such as:
• XML Gateway – transmits and validates XML data
• Cloud Storage Gateway – transforms cloud storage protocols and encodes storage devices to facilitate data transfer and storage
• Mobile Device Gateway – transforms the communication protocols used by mobile devices into protocols that are compatible with a cloud service
The levels at which transformation logic can be created include:
• transport protocols
• messaging protocols
• storage device protocols
• data schemas/data models
For example, a multi-device broker may contain mapping logic that coverts both transport and messaging protocols for a cloud service consumer accessing a cloud service with a mobile device.

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