Add StellaOps.Workflow engine: 14 libraries, WebService, 8 test projects
Extract product-agnostic workflow engine from Ablera.Serdica.Workflow into standalone StellaOps.Workflow.* libraries targeting net10.0. Libraries (14): - Contracts, Abstractions (compiler, decompiler, expression runtime) - Engine (execution, signaling, scheduling, projections, hosted services) - ElkSharp (generic graph layout algorithm) - Renderer.ElkSharp, Renderer.ElkJs, Renderer.Msagl, Renderer.Svg - Signaling.Redis, Signaling.OracleAq - DataStore.MongoDB, DataStore.PostgreSQL, DataStore.Oracle WebService: ASP.NET Core Minimal API with 22 endpoints Tests (8 projects, 109 tests pass): - Engine.Tests (105 pass), WebService.Tests (4 E2E pass) - Renderer.Tests, DataStore.MongoDB/Oracle/PostgreSQL.Tests - Signaling.Redis.Tests, IntegrationTests.Shared Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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using WorkflowEngine.Abstractions;
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namespace WorkflowEngine.Tutorials;
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/// <summary>
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/// Expression builder examples showing all expression types.
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/// These examples are not a runnable workflow — they demonstrate the WorkflowExpr API.
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/// </summary>
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internal static class ExpressionExamples
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{
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// ═══════════════════════════════════════════════
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// LITERALS
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// ═══════════════════════════════════════════════
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static readonly WorkflowExpressionDefinition nullExpr = WorkflowExpr.Null();
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static readonly WorkflowExpressionDefinition stringExpr = WorkflowExpr.String("hello");
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static readonly WorkflowExpressionDefinition numberExpr = WorkflowExpr.Number(42);
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static readonly WorkflowExpressionDefinition boolExpr = WorkflowExpr.Bool(true);
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// ═══════════════════════════════════════════════
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// PATH NAVIGATION
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// ═══════════════════════════════════════════════
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// Read from start request
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static readonly WorkflowExpressionDefinition fromStart = WorkflowExpr.Path("start.policyId");
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// Read from workflow state
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static readonly WorkflowExpressionDefinition fromState = WorkflowExpr.Path("state.customerName");
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// Read from task completion payload
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static readonly WorkflowExpressionDefinition fromPayload = WorkflowExpr.Path("payload.answer");
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// Read from step result (requires resultKey on the Call step)
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static readonly WorkflowExpressionDefinition fromResult = WorkflowExpr.Path("result.productInfo.lob");
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// Nested path navigation
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static readonly WorkflowExpressionDefinition nested = WorkflowExpr.Path("state.entityData.address.city");
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// ═══════════════════════════════════════════════
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// OBJECT & ARRAY CONSTRUCTION
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// ═══════════════════════════════════════════════
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static readonly WorkflowExpressionDefinition obj = WorkflowExpr.Object(
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WorkflowExpr.Prop("policyId", WorkflowExpr.Path("state.policyId")),
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WorkflowExpr.Prop("status", WorkflowExpr.String("ACTIVE")),
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WorkflowExpr.Prop("tags", WorkflowExpr.Array(
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WorkflowExpr.String("motor"),
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WorkflowExpr.String("casco"))));
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// ═══════════════════════════════════════════════
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// COMPARISONS
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// ═══════════════════════════════════════════════
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static readonly WorkflowExpressionDefinition eq = WorkflowExpr.Eq(
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WorkflowExpr.Path("state.status"), WorkflowExpr.String("APPROVED"));
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static readonly WorkflowExpressionDefinition ne = WorkflowExpr.Ne(
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WorkflowExpr.Path("state.status"), WorkflowExpr.String("REJECTED"));
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static readonly WorkflowExpressionDefinition gt = WorkflowExpr.Gt(
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WorkflowExpr.Path("state.premium"), WorkflowExpr.Number(1000));
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// ═══════════════════════════════════════════════
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// BOOLEAN LOGIC
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// ═══════════════════════════════════════════════
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static readonly WorkflowExpressionDefinition not = WorkflowExpr.Not(
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WorkflowExpr.Path("state.isRejected"));
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static readonly WorkflowExpressionDefinition and = WorkflowExpr.And(
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WorkflowExpr.Path("state.isValid"),
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WorkflowExpr.Not(WorkflowExpr.Path("state.isRejected")));
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static readonly WorkflowExpressionDefinition or = WorkflowExpr.Or(
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WorkflowExpr.Eq(WorkflowExpr.Path("state.status"), WorkflowExpr.String("APPROVED")),
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WorkflowExpr.Eq(WorkflowExpr.Path("state.status"), WorkflowExpr.String("OVERRIDE")));
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// ═══════════════════════════════════════════════
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// FUNCTION CALLS
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// ═══════════════════════════════════════════════
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// Coalesce: first non-null value
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static readonly WorkflowExpressionDefinition coalesce = WorkflowExpr.Func("coalesce",
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WorkflowExpr.Path("state.customerId"),
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WorkflowExpr.Path("start.customerId"),
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WorkflowExpr.Number(0));
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// String concatenation
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static readonly WorkflowExpressionDefinition concat = WorkflowExpr.Func("concat",
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WorkflowExpr.String("Policy #"),
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WorkflowExpr.Path("state.policyNo"));
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// Arithmetic
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static readonly WorkflowExpressionDefinition increment = WorkflowExpr.Func("add",
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WorkflowExpr.Func("coalesce",
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WorkflowExpr.Path("state.attempt"), WorkflowExpr.Number(0)),
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WorkflowExpr.Number(1));
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// Conditional value
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static readonly WorkflowExpressionDefinition conditional = WorkflowExpr.Func("if",
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WorkflowExpr.Path("state.isVip"),
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WorkflowExpr.String("VIP"),
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WorkflowExpr.String("Standard"));
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// Uppercase
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static readonly WorkflowExpressionDefinition upper = WorkflowExpr.Func("upper",
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WorkflowExpr.Path("state.annexType"));
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// Null check
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static readonly WorkflowExpressionDefinition nullCheck = WorkflowExpr.Func("isNullOrWhiteSpace",
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WorkflowExpr.Path("state.integrationId"));
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// Array length
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static readonly WorkflowExpressionDefinition length = WorkflowExpr.Func("length",
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WorkflowExpr.Path("state.documents"));
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// ═══════════════════════════════════════════════
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// COMBINING EXPRESSIONS (real-world patterns)
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// ═══════════════════════════════════════════════
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// "Use integration customer ID if present, otherwise use lookup ID"
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static readonly WorkflowExpressionDefinition resolveCustomerId = WorkflowExpr.Func("if",
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WorkflowExpr.Not(
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WorkflowExpr.Func("isNullOrWhiteSpace",
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WorkflowExpr.Path("state.integrationCustomerId"))),
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WorkflowExpr.Path("state.integrationCustomerId"),
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WorkflowExpr.Path("state.lookupCustomerId"));
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// "Should we retry? (first attempt or previous failed, and not timed out)"
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static readonly WorkflowExpressionDefinition shouldRetry = WorkflowExpr.Or(
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WorkflowExpr.Eq(WorkflowExpr.Path("state.retryAttempt"), WorkflowExpr.Number(0)),
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WorkflowExpr.And(
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WorkflowExpr.Not(WorkflowExpr.Path("state.timedOut")),
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WorkflowExpr.Path("state.integrationFailed")));
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}
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