Cloud Computing and Service Science by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783319949598
Publisher: Springer International Publishing

Further variants can be added, but there is a sufficient completeness of the given set to model common PaaS migration scenarios, which we have demonstrated through past case study evaluations.

The core pattern and variants guides the migration pattern selection. Architecture aspects (from the application and platform profiles) and the technical quality constraints are the initial selection criteria. The pattern selection can be seen as a variability management problem that distinguishes internal (provider-based deployment) and external (application and application access) perspectives. To make this more clear, we can look at different applications. Some applications are integrated and support core business processes and services, but many of them support utility needs, are certainly non-core applications and are independent. The latter category may be obvious candidates for direct re-deployment. For the former integrated core ones, refactoring (re-architecting or redesigning) is more appropriate.

Migration paths emerge as sequential compositions of these patterns on a source architecture, see Fig. 1. These paths are defined based on discussions with the company about their existing architecture and a high-level specification of technical and business targets. Migration paths define decision points where typically several architectural options emerge, e.g., different data storage options [7–9]. For (a subset of) these options, an experimental evaluation can be considered.

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