docs: add architecture, R&D, and patent strategy docs
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>VBD Diagrams - Volatility-Based Decomposition</title>
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<style>
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:root {
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--walmart-blue: #0053e2;
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* {
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box-sizing: border-box;
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}
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body {
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font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
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background: white;
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color: var(--walmart-gray-dark);
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line-height: 1.6;
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padding: 40px;
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max-width: 1200px;
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margin: 0 auto;
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}
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h1 {
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color: var(--walmart-blue);
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border-bottom: 3px solid var(--walmart-spark);
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padding-bottom: 10px;
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margin-bottom: 40px;
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}
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h2 {
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color: var(--walmart-blue);
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margin-top: 60px;
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margin-bottom: 20px;
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}
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.diagram-container {
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background: var(--walmart-gray-light);
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border-radius: 12px;
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.diagram-note {
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font-style: italic;
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margin-top: 15px;
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}
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/* Component Roles Diagram */
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.component-diagram {
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display: flex;
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flex-direction: column;
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align-items: center;
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gap: 20px;
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.component-row {
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padding: 20px 30px;
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text-align: center;
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min-width: 180px;
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font-weight: 600;
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box-shadow: 0 2px 8px rgba(0,0,0,0.1);
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}
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.manager {
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background: var(--walmart-blue);
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color: white;
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}
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.engine {
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background: var(--walmart-spark);
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color: var(--walmart-gray-dark);
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}
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.accessor {
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background: var(--walmart-green);
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color: white;
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}
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.utility {
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background: var(--walmart-gray-mid);
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color: white;
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}
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.arrow {
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display: flex;
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flex-direction: column;
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align-items: center;
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color: var(--walmart-gray-mid);
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}
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.arrow-line {
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width: 2px;
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border-top: 10px solid var(--walmart-gray-mid);
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}
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.arrow-label {
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font-size: 0.75em;
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.horizontal-arrow {
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display: flex;
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color: var(--walmart-gray-mid);
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}
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.h-arrow-line {
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width: 40px;
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.h-arrow-head {
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border-left: 10px solid var(--walmart-gray-mid);
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}
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.side-utility {
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position: relative;
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display: flex;
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align-items: center;
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gap: 20px;
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}
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.utility-bracket {
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display: flex;
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flex-direction: column;
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align-items: center;
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gap: 10px;
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}
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.bracket-line {
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width: 2px;
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height: 100px;
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background: var(--walmart-gray-mid);
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}
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.bracket-line::before,
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.bracket-line::after {
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content: '';
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position: absolute;
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width: 15px;
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height: 2px;
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background: var(--walmart-gray-mid);
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left: 0;
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}
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.bracket-line::before { top: 0; }
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.bracket-line::after { bottom: 0; }
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/* Communication Rules */
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.rules-grid {
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display: grid;
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grid-template-columns: repeat(4, 1fr);
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gap: 15px;
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margin-top: 30px;
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}
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.rule-card {
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background: white;
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border-radius: 8px;
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padding: 15px;
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border-left: 4px solid;
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}
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.rule-card.manager-rules { border-color: var(--walmart-blue); }
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.rule-card.engine-rules { border-color: var(--walmart-spark); }
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.rule-card.accessor-rules { border-color: var(--walmart-green); }
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.rule-card.utility-rules { border-color: var(--walmart-gray-mid); }
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.rule-card h4 {
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margin: 0 0 10px 0;
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font-size: 0.9em;
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}
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.rule-card ul {
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margin: 0;
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padding-left: 18px;
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font-size: 0.8em;
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}
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.rule-card li {
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margin-bottom: 5px;
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}
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.must-not { color: var(--walmart-red); }
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.may { color: var(--walmart-green); }
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/* Sequence Flow Diagram */
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.sequence-diagram {
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display: flex;
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flex-direction: column;
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gap: 0;
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}
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.sequence-row {
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display: grid;
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grid-template-columns: 150px 1fr 1fr 1fr 1fr;
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gap: 20px;
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padding: 15px 0;
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border-bottom: 1px dashed #ddd;
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}
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.sequence-row:last-child {
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border-bottom: none;
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}
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.sequence-header {
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font-weight: 700;
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background: white;
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padding: 10px;
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border-radius: 6px;
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text-align: center;
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font-size: 0.85em;
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}
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.sequence-header.manager { border: 2px solid var(--walmart-blue); color: var(--walmart-blue); }
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.sequence-header.engine { border: 2px solid var(--walmart-spark); color: #996600; }
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.sequence-header.accessor { border: 2px solid var(--walmart-green); color: var(--walmart-green); }
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.sequence-header.utility { border: 2px solid var(--walmart-gray-mid); color: var(--walmart-gray-mid); }
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.sequence-step {
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font-size: 0.8em;
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padding: 8px;
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background: white;
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border-radius: 4px;
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text-align: center;
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}
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.step-label {
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font-weight: 600;
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font-size: 0.75em;
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color: white;
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display: inline-block;
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padding: 2px 8px;
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border-radius: 10px;
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margin-bottom: 5px;
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}
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.step-label.s1 { background: var(--walmart-blue); }
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.step-label.s2 { background: var(--walmart-spark); color: var(--walmart-gray-dark); }
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.step-label.s3 { background: var(--walmart-green); }
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.step-label.s4 { background: var(--walmart-gray-mid); }
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.step-label.s5 { background: var(--walmart-blue); }
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/* Volatility Axes Diagram */
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.volatility-grid {
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display: grid;
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grid-template-columns: repeat(2, 1fr);
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gap: 25px;
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}
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.volatility-card {
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background: white;
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border-radius: 12px;
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padding: 25px;
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box-shadow: 0 2px 8px rgba(0,0,0,0.08);
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}
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.volatility-card h3 {
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margin: 0 0 15px 0;
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display: flex;
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align-items: center;
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gap: 10px;
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}
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.volatility-icon {
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width: 40px;
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height: 40px;
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border-radius: 8px;
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display: flex;
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align-items: center;
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justify-content: center;
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font-size: 1.2em;
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}
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.func-icon { background: var(--walmart-blue-light); }
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.nonfunc-icon { background: #fff3cd; }
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.cross-icon { background: #e8e8e8; }
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.env-icon { background: #d4edda; }
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.volatility-card p {
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margin: 0 0 15px 0;
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font-size: 0.9em;
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color: var(--walmart-gray-mid);
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}
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.examples-list {
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background: var(--walmart-gray-light);
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padding: 12px 15px;
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border-radius: 6px;
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font-size: 0.85em;
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}
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.examples-list strong {
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color: var(--walmart-gray-dark);
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}
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.handled-by {
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margin-top: 12px;
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font-size: 0.8em;
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padding: 8px 12px;
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border-radius: 20px;
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display: inline-block;
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}
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.handled-by.by-engine { background: var(--walmart-spark); color: var(--walmart-gray-dark); }
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.handled-by.by-accessor { background: var(--walmart-green); color: white; }
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.handled-by.by-utility { background: var(--walmart-gray-mid); color: white; }
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.handled-by.by-manager { background: var(--walmart-blue); color: white; }
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/* Legend */
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.legend {
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display: flex;
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gap: 20px;
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justify-content: center;
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margin-top: 30px;
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flex-wrap: wrap;
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}
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.legend-item {
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display: flex;
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align-items: center;
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||||
gap: 8px;
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font-size: 0.85em;
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}
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.legend-color {
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width: 20px;
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height: 20px;
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border-radius: 4px;
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}
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.footer {
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margin-top: 60px;
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padding-top: 20px;
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border-top: 1px solid #ddd;
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text-align: center;
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color: var(--walmart-gray-mid);
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font-size: 0.85em;
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}
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</style>
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</head>
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<body>
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<h1>📐 Volatility-Based Decomposition Diagrams</h1>
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<p>Visual reference for the VBD whitepaper by William Christopher Anderson</p>
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<!-- DIAGRAM 1: Component Roles -->
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<h2>1. Component Roles & Communication Rules</h2>
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<div class="diagram-container">
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<div class="component-diagram" style="position: relative;">
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<!-- SVG just for the curved arrow -->
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<svg width="500" height="100%" style="position: absolute; top: 0; right: -60px; pointer-events: none; z-index: 0;">
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<defs>
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||||
<marker id="arrowhead-blue" markerWidth="10" markerHeight="7" refX="9" refY="3.5" orient="auto">
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<polygon points="0 0, 10 3.5, 0 7" fill="#0053e2" />
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</marker>
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</defs>
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<!-- Manager to Resource Accessor (curved arrow on the right side) -->
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<path d="M 100 40 C 180 40, 180 260, 110 315" stroke="#0053e2" stroke-width="2" fill="none" stroke-dasharray="5,3" marker-end="url(#arrowhead-blue)" />
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<text x="170" y="175" fill="#0053e2" font-size="11" font-style="italic">may</text>
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<text x="170" y="188" fill="#0053e2" font-size="11" font-style="italic">invoke</text>
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</svg>
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<!-- Component boxes stacked with inline arrows -->
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<div style="display: flex; flex-direction: column; align-items: center; position: relative; z-index: 1;">
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<!-- Manager -->
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<div class="component-box manager">
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📋 MANAGER<br>
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<small style="font-weight:400">Orchestration & Intent</small>
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</div>
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<!-- Arrow: Manager to Engine -->
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<div class="arrow">
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<div class="arrow-line"></div>
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<div class="arrow-head"></div>
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<span class="arrow-label">invokes</span>
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</div>
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||||
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<!-- Engine -->
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<div class="component-box engine">
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⚙️ ENGINE<br>
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<small style="font-weight:400">Business Rules & Logic</small>
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</div>
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||||
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||||
<!-- Arrow: Engine to Resource Accessor -->
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||||
<div class="arrow">
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<div class="arrow-line"></div>
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||||
<div class="arrow-head"></div>
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||||
<span class="arrow-label">may call</span>
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||||
</div>
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||||
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||||
<!-- Resource Accessor -->
|
||||
<div class="component-box accessor">
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||||
🔌 RESOURCE ACCESSOR<br>
|
||||
<small style="font-weight:400">Data, Services & Infrastructure</small>
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||||
</div>
|
||||
</div>
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||||
|
||||
<!-- Side: Utilities -->
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||||
<div style="margin-top: 30px; display: flex; flex-direction: column; align-items: center;">
|
||||
<div class="component-box utility">
|
||||
🔧 UTILITIES<br>
|
||||
<small style="font-weight:400">Logging, Monitoring, Security</small>
|
||||
</div>
|
||||
<span style="font-size: 0.85em; color: var(--walmart-gray-mid); margin-top: 8px;">Cross-cutting • Used by all layers</span>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<!-- Communication Rules -->
|
||||
<div class="rules-grid">
|
||||
<div class="rule-card manager-rules">
|
||||
<h4>📋 Managers</h4>
|
||||
<ul>
|
||||
<li class="must-not">MUST NOT compute</li>
|
||||
<li class="must-not">MUST NOT share state</li>
|
||||
<li class="may">MAY invoke Engines</li>
|
||||
<li class="may">MAY invoke Resource Accessors</li>
|
||||
<li class="may">MAY queue to Managers</li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="rule-card engine-rules">
|
||||
<h4>⚙️ Engines</h4>
|
||||
<ul>
|
||||
<li class="must-not">MUST NOT call Engines</li>
|
||||
<li class="must-not">MUST NOT use queues</li>
|
||||
<li class="may">MAY call Resource Accessors</li>
|
||||
<li>Unaware of workflow</li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="rule-card accessor-rules">
|
||||
<h4>🔌 Resource Accessors</h4>
|
||||
<ul>
|
||||
<li class="must-not">MUST NOT call Engines</li>
|
||||
<li class="must-not">MUST NOT call Resource Accessors</li>
|
||||
<li class="must-not">MUST NOT use queues</li>
|
||||
<li>No business logic</li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="rule-card utility-rules">
|
||||
<h4>🔧 Utilities</h4>
|
||||
<ul>
|
||||
<li class="must-not">MUST NOT coordinate</li>
|
||||
<li class="must-not">MUST NOT enforce policy</li>
|
||||
<li>Domain-agnostic</li>
|
||||
<li>Shared capabilities</li>
|
||||
</ul>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="legend">
|
||||
<div class="legend-item"><div class="legend-color" style="background: var(--walmart-blue)"></div> Manager (Stable)</div>
|
||||
<div class="legend-item"><div class="legend-color" style="background: var(--walmart-spark)"></div> Engine (High Volatility)</div>
|
||||
<div class="legend-item"><div class="legend-color" style="background: var(--walmart-green)"></div> Resource Accessor (Resources & Integration)</div>
|
||||
<div class="legend-item"><div class="legend-color" style="background: var(--walmart-gray-mid)"></div> Utility (Cross-cutting)</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<!-- DIAGRAM 2: Sequence Flow -->
|
||||
<h2>2. Core Use Case Flow Example</h2>
|
||||
<div class="diagram-container">
|
||||
<p style="margin-bottom: 20px;"><strong>Example:</strong> Order Processing Core Use Case</p>
|
||||
|
||||
<div class="sequence-diagram">
|
||||
<div class="sequence-row">
|
||||
<div></div>
|
||||
<div class="sequence-header manager">Order Manager</div>
|
||||
<div class="sequence-header engine">Pricing Engine</div>
|
||||
<div class="sequence-header accessor">Order Resource Accessor</div>
|
||||
<div class="sequence-header utility">Logging Utility</div>
|
||||
</div>
|
||||
|
||||
<div class="sequence-row">
|
||||
<div style="font-size: 0.85em; text-align: right; padding-right: 10px;">① Request</div>
|
||||
<div class="sequence-step">
|
||||
<span class="step-label s1">RECEIVE</span><br>
|
||||
Receives order request, begins orchestration
|
||||
</div>
|
||||
<div></div>
|
||||
<div></div>
|
||||
<div class="sequence-step">
|
||||
<span class="step-label s4">LOG</span><br>
|
||||
Correlation ID assigned
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="sequence-row">
|
||||
<div style="font-size: 0.85em; text-align: right; padding-right: 10px;">② Price</div>
|
||||
<div class="sequence-step">
|
||||
<span class="step-label s1">INVOKE</span><br>
|
||||
Calls Pricing Engine
|
||||
</div>
|
||||
<div class="sequence-step">
|
||||
<span class="step-label s2">CALCULATE</span><br>
|
||||
Applies rules, tiers, promotions
|
||||
</div>
|
||||
<div></div>
|
||||
<div></div>
|
||||
</div>
|
||||
|
||||
<div class="sequence-row">
|
||||
<div style="font-size: 0.85em; text-align: right; padding-right: 10px;">③ Persist</div>
|
||||
<div class="sequence-step">
|
||||
<span class="step-label s1">INVOKE</span><br>
|
||||
Calls Repository
|
||||
</div>
|
||||
<div></div>
|
||||
<div class="sequence-step">
|
||||
<span class="step-label s3">STORE</span><br>
|
||||
Persists order to database
|
||||
</div>
|
||||
<div></div>
|
||||
</div>
|
||||
|
||||
<div class="sequence-row">
|
||||
<div style="font-size: 0.85em; text-align: right; padding-right: 10px;">④ Complete</div>
|
||||
<div class="sequence-step">
|
||||
<span class="step-label s1">RETURN</span><br>
|
||||
Returns confirmation
|
||||
</div>
|
||||
<div></div>
|
||||
<div></div>
|
||||
<div class="sequence-step">
|
||||
<span class="step-label s4">LOG</span><br>
|
||||
Completion logged
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<p class="diagram-note">Note: Manager coordinates but never computes. Engine calculates but is unaware of workflow. Accessor persists but has no business logic. Utilities are invoked orthogonally by all layers.</p>
|
||||
</div>
|
||||
|
||||
<!-- DIAGRAM 3: Volatility Axes -->
|
||||
<h2>3. The Four Volatility Axes</h2>
|
||||
<div class="diagram-container">
|
||||
<div class="volatility-grid">
|
||||
<div class="volatility-card">
|
||||
<h3>
|
||||
<span class="volatility-icon func-icon">📊</span>
|
||||
Functional Volatility
|
||||
</h3>
|
||||
<p>Changes to system behavior driven by business needs, user feedback, or regulations.</p>
|
||||
<div class="examples-list">
|
||||
<strong>Examples:</strong> New features, modified workflows, removed functionality, policy changes
|
||||
</div>
|
||||
<span class="handled-by by-manager">📋 Managers</span>
|
||||
<span class="handled-by by-engine" style="margin-left: 8px;">⚙️ Engines</span>
|
||||
<span class="handled-by by-accessor" style="margin-left: 8px;">🔌 Resource Accessors</span>
|
||||
</div>
|
||||
|
||||
<div class="volatility-card">
|
||||
<h3>
|
||||
<span class="volatility-icon nonfunc-icon">⚡</span>
|
||||
Non-Functional Volatility
|
||||
</h3>
|
||||
<p>Changes to system qualities like performance, scalability, reliability, security.</p>
|
||||
<div class="examples-list">
|
||||
<strong>Examples:</strong> Infrastructure upgrades, scaling requirements, SLA changes
|
||||
</div>
|
||||
<span class="handled-by" style="background: var(--walmart-gray-light); color: var(--walmart-gray-dark); border: 1px solid #ccc;">✨ Systemic benefit of VBD</span>
|
||||
</div>
|
||||
|
||||
<div class="volatility-card">
|
||||
<h3>
|
||||
<span class="volatility-icon cross-icon">🔗</span>
|
||||
Cross-Cutting Volatility
|
||||
</h3>
|
||||
<p>Changes to concerns that span multiple components: logging, auth, monitoring.</p>
|
||||
<div class="examples-list">
|
||||
<strong>Examples:</strong> New observability requirements, auth protocol changes, audit logging
|
||||
</div>
|
||||
<span class="handled-by by-utility">🔧 Utilities</span>
|
||||
</div>
|
||||
|
||||
<div class="volatility-card">
|
||||
<h3>
|
||||
<span class="volatility-icon env-icon">🌍</span>
|
||||
Environmental & Infrastructure Volatility
|
||||
</h3>
|
||||
<p>Changes to databases, external systems, vendors, deployment platforms, and third-party integrations.</p>
|
||||
<div class="examples-list">
|
||||
<strong>Examples:</strong> Database migrations, vendor swaps, API versioning, cloud platform changes, protocol updates
|
||||
</div>
|
||||
<span class="handled-by by-accessor">🔌 Resource Accessors</span>
|
||||
<span class="handled-by" style="background: var(--walmart-gray-light); color: var(--walmart-gray-dark); border: 1px solid #ccc; margin-left: 8px;">✨ Systemic benefit of VBD</span>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<p class="diagram-note">By aligning component boundaries with these volatility axes, changes are localized and predictable. The Manager layer remains stable because it only expresses intent—it doesn't implement volatile logic.</p>
|
||||
</div>
|
||||
|
||||
<div class="footer">
|
||||
<p>Generated for: <strong>Volatility-Based Decomposition (VBD) in Software Architecture</strong></p>
|
||||
<p>Author: William Christopher Anderson • February 2026</p>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user