# Eo

## Overview

`Eo` appears to be a small package boundary for web-facing integration fixtures rather than a heavy business-logic subsystem. The available evidence suggests that this area is responsible for wiring together framework configuration, page-flow entry points, and presentation artifacts such as JSP views and XML descriptors.

At this level, the most important thing is not internal computation but stable naming and resolution. External configuration appears to refer to classes in this package by exact name, so the package functions as a contract surface between the web framework and the view layer.

## Sub-module Guide

### `web`

The documented child module is `eo.web`, which is described as a small web-integration layer. It appears to provide the concrete example of how this package boundary is used in practice.

Within that child area, the key fixture is `webview`, centered on the `ACA001SF` page component. The child documentation identifies two main pieces of that fixture:

- `ACA001SFBean` - a simple data carrier exposing a `value` property for the view layer
- `ACA001SFLogic` - an execution hook with an empty `execute()` method

These pieces work together through configuration rather than direct code coupling. The logic class is the framework entry point named by XML, while the bean is the state object that JSP or related presentation files consume. The child module also mentions a second `ACA001SFLogic` variant in `xml-unresolved-fqn`, which appears to exist to exercise alternate class-resolution behavior.

In other words, `eo.web` is the broader integration boundary, and `webview` is the concrete fixture that shows how that boundary is expected to behave. The parent package defines the area; the child supplies the page-level pieces that the surrounding web stack binds together.

## Key Patterns and Architecture

### Configuration-first wiring

This area appears to be organized around external configuration rather than direct Java-to-Java calls:

1. XML config names a logic class.
2. The framework instantiates the class and calls `execute()`.
3. JSP or similar view artifacts consume the bean state.

This pattern makes the module useful as a fixture for framework integration, especially where the important behavior is selection by name rather than computation inside methods.

### Thin logic and thin data objects

The documented classes are intentionally minimal:

- `ACA001SFLogic` contains an empty `execute()` method
- `ACA001SFBean` exposes only a simple property surface

That structure indicates that the technical focus is on binding and resolution, not on algorithmic work. The module appears to verify that the web stack can locate the right class, create the right objects, and hand control to the correct view path.

### Dual-source resolution scenario

The duplicate logic class mentioned in `xml-unresolved-fqn` suggests a deliberate resolution test. One source tree appears to represent the normal fixture, and the alternate tree appears to represent a case where XML lookup does not resolve the fully qualified name in the same way. This makes the area useful for validating classpath and configuration edge cases as well as ordinary page flow.

### Module interaction diagram

```mermaid
flowchart TD
Eo["Eo"] --> EoWeb["eo.web"]
EoWeb --> Webview["webview"]
Webview --> ACA001SF["ACA001SF"]
ACA001SF --> Bean["ACA001SFBean"]
ACA001SF --> LogicMain["ACA001SFLogic full-fixture-codebase"]
ACA001SF --> LogicAlt["ACA001SFLogic xml-unresolved-fqn"]
LogicMain --> ConfigAndViews["XML configs and JSP views"]
LogicAlt --> ConfigAndViews
Bean --> ConfigAndViews
```

## Dependencies and Integration

The evidence for this module shows no resolved package dependencies and no indexed source symbols beyond the documented child page. That points to a very light internal structure and a strong reliance on external integration points.

### External integration surfaces

Based on the child documentation, the main integrations are:

- XML configuration files that name `ACA001SFLogic` and `ACA001SFBean`
- JSP pages that consume `ACA001SFBean`
- framework mechanisms that invoke `execute()` on the configured logic class

The child page specifically references these consumers or related artifacts:

- [WEBGAMEN_FULL_ACA001.xml](full-fixture-codebase/src/java/eo/web/webview/ACA001SF/ACA001SFBean.java)
- [faces-config.xml](full-fixture-codebase/src/java/eo/web/webview/ACA001SF/ACA001SFBean.java)
- [WEBGAMEN_ACA001010PJP.xml](full-fixture-codebase/src/java/eo/web/webview/ACA001SF/ACA001SFBean.java)
- [x33S_ACA001.xml](full-fixture-codebase/src/java/eo/web/webview/ACA001SF/ACA001SFBean.java)
- [FULL_ACA001010PJP.jsp](full-fixture-codebase/src/java/eo/web/webview/ACA001SF/ACA001SFBean.java)
- [external-refs.xml](full-fixture-codebase/src/java/eo/web/webview/ACA001SF/ACA001SFLogic.java)

These links show that the package is meant to be consumed by exact class name, so packaging and naming stability matter more here than internal complexity.

## Notes for Developers

- Treat `Eo` as a contract boundary. Renaming or relocating classes may break XML or JSP references even if compilation still succeeds.
- `ACA001SFBean` is currently minimal and read-focused. If additional state is needed, verify how the surrounding framework expects beans to be populated before adding behavior.
- `ACA001SFLogic` is empty in the documented fixture. That usually means the framework or configuration carries the real behavior, so inspect the XML and view files before assuming the class should contain logic.
- Because the child documentation includes an alternate `xml-unresolved-fqn` variant, be careful when debugging resolution issues. One source tree may be intended to model normal behavior while the other exists specifically to demonstrate lookup failure or ambiguity.
- When extending this area, prefer keeping the API surface stable and explicit. The surrounding system appears to depend on predictable names rather than on complex class relationships.