Fragment Bundle Limiting in OSGi Host Applications
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Solution Overview
Problem
The current OSGi specification does not allow for limiting the number of fragment bundles that can be added to a host bundle, leading to issues such as indistinguishable trial and licensed versions, increased development complexity, inconsistent configurations during version updates, and resource limitations on image forming apparatuses.
Innovation Solution
An information processing apparatus that includes a framework to manage applications based on a manifest, with an installing unit that limits the number of extension applications installed to match the maximum number specified in the host application's manifest, thereby controlling the number of fragment bundles that can be added to a host bundle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the number of fragment bundles is limited to match the maximum number specified in the host application's manifest, then configuration consistency during updates is maintained and development scale is stabilized, but the flexibility and adaptability of the application platform is reduced
Solution Approach 1:
The patent changes the parameter of fragment bundle quantity from unlimited to limited by introducing a maximum number specification in the manifest file. This parameter change enables the system to maintain configuration consistency while still allowing flexibility within the defined limit, resolving the contradiction between stability and adaptability.
2Reliability
If the number of fragment bundles is limited, then trial and licensed versions can be distinguished and resource usage is controlled, but the extensibility and customization capability of the host application is reduced
Solution Approach 1:
The patent applies preliminary action by pre-specifying the maximum number of fragment bundles in the host application's manifest file before deployment. This advance configuration enables version discrimination between trial and licensed versions while maintaining controlled extensibility, as the limit is set beforehand but still allows customization within that boundary.
3Adaptability or versatility
If fragment bundles can be added without limitation, then the application can be highly customized and extended, but inconsistent configurations occur during version updates and development complexity increases
Solution Approach 1:
The patent implements feedback by having the framework check whether the number of installed fragment bundles exceeds the maximum number specified in the manifest. This feedback mechanism prevents inconsistent configurations during updates and controls development complexity while still allowing customization within the defined limits, resolving the contradiction between adaptability and complexity.
Data Source
AI summary
An information processing apparatus performs installation when a number of the extension applications that are installed to extend the host application is less than or equal to a maximum number of the extension applications that can be held by the host application as described in a manifest of the host application, during installation of an extension application that extends a host application.