# Com / Fujitsu / Futurity / Bp ## Overview The `com.fujitsu.futurity.bp` package sits within the **Fujitsu Futurity billing and pricing ecosystem**. The `bp` qualifier (billing/pricing) identifies this as the financial domain of the Futurity product suite — the layer responsible for rate-engineering, billing logic, pricing calculations, and associated configuration. Within this namespace, the `custom` sub-package provides a **customization layer** that extends or overrides the standard Futurity billing behavior. This pattern — separating site-specific or client-specific logic from the core product — is common in enterprise billing platforms, where a single codebase must serve multiple deployments with different rate plans, billing rules, and feature requirements. The customization architecture relies on a **constants-as-configuration** approach: configurable values (property keys, rate-plan codes, feature flags, error codes) are centralized in the `custom.constant` sub-module, and consumed by other customization logic through static references. This avoids magic strings scattered across files and gives operators a single source of truth for deployment-specific values. As of the current code index, **no source files have been collected** for this module or its children. The understanding below is derived from package structure, naming conventions, and the structural metadata available in the documentation wiki. ## Sub-module Guide ### custom The `custom` sub-package is the primary and only documented child of this module. It represents the **bespoke extension layer** — logic that deviates from or augments the standard Futurity billing/pricing behavior. **What it does:** This layer holds site-specific customizations that are likely activated conditionally (via feature flags, configuration profiles, or deployment-specific settings). The standard Futurity billing behavior would live in parent packages (e.g., `com.fujitsu.futurity.bp`), while the `custom` layer provides the deviations for particular clients or deployments. **How it relates to `constant`:** The `custom` package delegates its fixed values — configuration keys, domain literals, rate-plan identifiers — to its `constant` sub-module. This creates a two-level structure where `constant` acts as the foundational value store, and `custom` is the namespace for logic that consumes those values. #### constant The `constant` sub-module consolidates all constant definitions used across the customization layer. In a billing and pricing context, these typically include: - **Configuration property keys** — strings used to look up settings from configuration files or external property stores. - **Domain-specific literals** — fixed values such as rate-plan codes, billing-cycle identifiers, or feature-flag markers. - **Error or status codes** — constants signaling specific billing or pricing conditions. These constants are designed to be consumed by other customization components throughout the package, acting as the single source of truth for values that multiple pieces of logic reference. #### Module Relationship The relationship between `custom` and `constant` is hierarchical and foundational: ```mermaid flowchart TD A["bp (billing/pricing domain)"] --> B["custom (customization layer)"] B --> C["constant (constants/config keys)"] style A fill:#e1f5fe style B fill:#fff3e0 style C fill:#f3e5f5 ``` This forms a three-level nesting where each level refines the scope: the product family (`futurity`), the billing/pricing domain (`bp`), the customization boundary (`custom`), and finally the value definitions (`constant`). ## Key Patterns and Architecture ### Constants-as-Configuration The most prominent pattern in this module is the use of a dedicated `constant` sub-module to centralize configurable values. Rather than scattering magic strings across multiple files, the codebase uses a single module as the authoritative source for configuration keys, rate-plan codes, and feature flags. This is a common pattern in billing systems where correctness and consistency of these values is critical. ### Customization via Conditional Activation The `custom` qualifier in the package name strongly suggests that this code is not always active. It appears to be part of a **conditional activation strategy** — perhaps gated by a feature flag, a deployment configuration profile, or a client-specific toggle. Standard Futurity behavior lives in parent packages, while the `custom` layer overrides or augments it when the appropriate condition is met. ### Layered Abstraction The three-level nesting (`futurity` → `bp` → `custom`) represents a deliberate architectural boundary: - **`futurity`** — the product family level, shared across all Futurity domains. - **`bp`** — the billing/pricing domain, encapsulating financial logic specific to rates and charges. - **`custom`** — the customization boundary, separating standard from client-specific behavior. This separation allows the core product to remain stable while customization logic can evolve independently. ## Dependencies and Integration ### Package Dependencies No package dependencies were resolved for this module, likely due to the absence of indexed source files. Based on the package naming, the expected dependencies include: - **`com.fujitsu.futurity.bp`** — the parent billing/pricing package, which would provide base classes, interfaces, and shared utilities for billing logic. - **`com.fujitsu.futurity`** — the top-level product package, providing cross-domain shared types. ### Cross-Module Relationships No cross-module relationships were detected in the index. This module does not appear to export public APIs consumed by other modules, nor does it appear to be consumed by sibling modules. This suggests it is an **internal customization hook** with limited cross-module visibility — it likely operates as an isolated extension point within the broader billing system. ## Notes for Developers - **No source files indexed**: Neither this module nor its children have indexed source files (`.java` or otherwise). The code may exist in a different compilation unit, be loaded dynamically at runtime, or simply not yet be scanned by the documentation tooling. Check the build configuration and source roots to ensure this package path is included. - **Finding configuration values**: If you are looking for specific configuration keys, rate-plan codes, or feature flags, start with the `custom.constant` sub-module — though its content has not yet been indexed. - **Understanding activation logic**: The `custom` qualifier implies this code may only be active under specific deployment configurations. Review the feature-toggle or configuration activation logic in the parent `com.fujitsu.futurity.bp` package to understand when this customization layer is engaged. - **Limited cross-module visibility**: There are no known consumers of this module's output in the current index. If this module is meant to contribute behavior to the broader billing system, those integration points have not been captured in the index. - **No documented dependencies**: The absence of resolved package dependencies likely reflects indexing gaps rather than actual independence. Expect this module to depend on core `futurity.bp` infrastructure classes.