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-<div id="main"> - - <h1 class="page-title">15_Integration_Patterns</h1> - - - <section> - -<header> - -</header> - -<article> - <h1>Integration Patterns</h1> -<h2>What are Integration Patterns?</h2> -<p>Integration patterns show how to connect Baba Yaga programs with external systems, APIs, and other services while maintaining functional purity through the <code>..emit</code> and <code>..listen</code> pattern.</p> -<h2>Basic Integration Concepts</h2> -<h3>Emit and Listen Pattern</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Emit events to external systems */ -..emit "user_created" {id: 123, name: "Alice"}; -..emit "data_processed" {count: 42, success: true}; - -/* Listen for external events */ -..listen "user_created" handle_user_created; -..listen "data_processed" handle_data_processed; -</code></pre> -<h3>State Management</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Get current state from external system */ -current_state : ..listen; - -/* Process based on state */ -user_id : current_state.user_id; -user_data : current_state.user_data; - -/* Emit processed result */ -..emit "user_processed" { - id: user_id, - processed_data: transform user_data -}; -</code></pre> -<h2>API Integration</h2> -<h3>HTTP Request Pattern</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Emit HTTP requests */ -..emit { - action: "http_request", - method: "GET", - url: "https://api.example.com/users/123" -}; - -/* Emit POST request with data */ -..emit { - action: "http_request", - method: "POST", - url: "https://api.example.com/users", - data: {name: "Alice", email: "alice@example.com"} -}; -</code></pre> -<h3>API Response Handling</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Listen for API responses */ -..listen "api_response" handle_api_response; - -handle_api_response : response -> - when response.success is - true then - ..out "API call successful:"; - ..out response.data - false then - ..out "API call failed:"; - ..out response.error; -</code></pre> -<h2>Database Integration</h2> -<h3>Database Operations</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Emit database queries */ -..emit { - action: "db_query", - type: "select", - table: "users", - where: {id: 123} -}; - -/* Emit insert operation */ -..emit { - action: "db_query", - type: "insert", - table: "users", - data: {name: "Bob", email: "bob@example.com"} -}; -</code></pre> -<h3>Database Response Processing</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Process database results */ -..listen "db_result" handle_db_result; - -handle_db_result : result -> - when result.type = "select" then - users : result.data; - processed_users : map @format_user users; - ..out "Found " + t.length users + " users"; - processed_users - _ then result.data; -</code></pre> -<h2>File System Integration</h2> -<h3>File Operations</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Emit file operations */ -..emit { - action: "file_operation", - type: "read", - path: "/data/users.json" -}; - -/* Emit write operation */ -..emit { - action: "file_operation", - type: "write", - path: "/output/processed.json", - content: processed_data -}; -</code></pre> -<h3>File Processing</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Process file contents */ -..listen "file_result" handle_file_result; - -handle_file_result : result -> - when result.type = "read" then - data : parse_json result.content; - processed : transform_data data; - processed - _ then result; -</code></pre> -<h2>Event-Driven Architecture</h2> -<h3>Event Processing Pipeline</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Process incoming events */ -process_event : event -> - when event.type = "user_created" then - user : event.data; - validated_user : validate_user user; - when validated_user.valid is - true then - ..emit "user_validated" validated_user.data; - validated_user.data - false then - ..emit "validation_failed" validated_user.errors; - null - _ then event.data; -</code></pre> -<h3>Event Handlers</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Register event handlers */ -..listen "user_created" process_event; -..listen "order_placed" process_event; -..listen "payment_received" process_event; -</code></pre> -<h2>External Service Integration</h2> -<h3>Third-Party API Integration</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Integrate with external service */ -integrate_payment : order -> - payment_data : { - amount: order.total, - currency: "USD", - customer_id: order.customer_id - }; - - ..emit { - action: "external_api", - service: "stripe", - endpoint: "/payments", - method: "POST", - data: payment_data - }; - - payment_data; -</code></pre> -<h3>Service Response Handling</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Handle external service responses */ -..listen "external_api_response" handle_external_response; - -handle_external_response : response -> - when response.service = "stripe" then - when response.success is - true then - ..emit "payment_successful" response.data; - response.data - false then - ..emit "payment_failed" response.error; - null - _ then response; -</code></pre> -<h2>Real-World Integration Example</h2> -<h3>E-commerce Order Processing</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Complete order processing pipeline */ -process_order : order -> - /* Step 1: Validate order */ - validation_result : validate_order order; - when validation_result.valid is - false then - ..emit "order_invalid" validation_result.errors; - null - _ then - /* Step 2: Check inventory */ - ..emit { - action: "db_query", - type: "select", - table: "inventory", - where: {product_id: order.product_id} - }; - - /* Step 3: Process payment */ - payment_result : integrate_payment order; - - /* Step 4: Update inventory */ - ..emit { - action: "db_query", - type: "update", - table: "inventory", - where: {product_id: order.product_id}, - data: {quantity: decrement_quantity order.quantity} - }; - - /* Step 5: Send confirmation */ - ..emit { - action: "email", - to: order.customer_email, - subject: "Order Confirmed", - template: "order_confirmation", - data: order - }; - - {order_id: order.id, status: "processed"}; -</code></pre> -<h2>Error Handling in Integration</h2> -<h3>Graceful Degradation</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Handle integration failures */ -safe_api_call : api_request -> - ..emit api_request; - - /* Set timeout for response */ - timeout_result : wait_for_response 5000; - when timeout_result.timeout is - true then - ..emit "api_timeout" api_request; - {error: "API timeout", fallback: true} - _ then timeout_result.response; -</code></pre> -<h3>Retry Logic</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Retry failed operations */ -retry_operation : operation max_retries -> - attempt_operation : attempt -> - when attempt > max_retries then - ..emit "max_retries_exceeded" operation; - {error: "Max retries exceeded"} - _ then - result : operation; - when result.error is - true then - delay : power 2 attempt; /* Exponential backoff */ - ..emit "retry_attempt" {attempt: attempt, delay: delay}; - retry_operation operation max_retries - false then result; - - attempt_operation 1; -</code></pre> -<h2>Testing Integration</h2> -<h3>Mock External Services</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Test integration without real services */ -test_payment_integration : -> - /* Mock order */ - test_order : { - id: "test_123", - total: 100, - customer_id: "cust_456" - }; - - /* Test payment integration */ - result : integrate_payment test_order; - - /* Verify emitted events */ - ..assert "Payment data emitted" result.amount = 100; - ..assert "Payment data emitted" result.currency = "USD"; - - ..out "Payment integration test passed"; -</code></pre> -<h3>Integration Test Patterns</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Test complete integration flow */ -test_order_flow : -> - /* Test order */ - test_order : { - id: "test_123", - product_id: "prod_789", - quantity: 2, - customer_email: "test@example.com", - total: 50 - }; - - /* Process order */ - result : process_order test_order; - - /* Verify result */ - ..assert "Order processed successfully" result.status = "processed"; - ..assert "Order ID preserved" result.order_id = "test_123"; - - ..out "Order flow test passed"; -</code></pre> -<h2>Best Practices</h2> -<h3>Keep Integration Pure</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Good: Pure function with explicit side effects */ -process_data : data -> - transformed : transform data; - ..emit "data_processed" transformed; - transformed; - -/* Avoid: Hidden side effects */ -bad_process : data -> - ..emit "processing_started"; /* Hidden side effect */ - transform data; -</code></pre> -<h3>Use Structured Events</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Good: Structured event data */ -..emit { - type: "user_created", - timestamp: now(), - data: {id: 123, name: "Alice"}, - metadata: {source: "web_form", version: "1.0"} -}; - -/* Avoid: Unstructured events */ -..emit "user_created Alice 123"; /* Hard to parse */ -</code></pre> -<h3>Handle Errors Gracefully</h3> -<pre class="prettyprint source lang-plaintext"><code>/* Good: Explicit error handling */ -safe_integration : request -> - when request.valid is - false then - ..emit "integration_error" {request: request, error: "Invalid request"}; - null - _ then - result : call_external_service request; - when result.error is - true then - ..emit "service_error" result; - result.fallback_value - false then result.data; -</code></pre> -<h2>Next Steps</h2> -<p>Now that you understand integration patterns, explore:</p> -<ul> -<li><a href="13_Error_Handling.md">Error Handling</a> for robust error management</li> -<li><a href="14_Advanced_Combinators.md">Advanced Combinators</a> for complex integration patterns</li> -<li><a href="16_Best_Practices.md">Best Practices</a> for writing maintainable code</li> -</ul> -</article> - -</section> - -</div> - -<br class="clear"> - -<footer> - Generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 4.0.4</a> on Tue Jul 29 2025 23:15:00 GMT-0400 (Eastern Daylight Time) using the Minami theme. -</footer> - -<script>prettyPrint();</script> -<script src="scripts/linenumber.js"></script> -</body> -</html> \ No newline at end of file |