// Backend Connectivity Patterns for dist_agent_lang
// Comprehensive guide to connecting to various backend systems
// =====================================================
// PATTERN 1: Database Connectivity
// =====================================================
@trust("hybrid")
service DatabaseConnectivity {
connections: map<string, any>,
connection_pools: map<string, any>,
fn initialize() {
// Setup multiple database connections
self.setup_database_connections();
self.setup_connection_pools();
}
fn setup_database_connections() {
// PostgreSQL connection
let pg_config = {
"host": "localhost",
"port": 5432,
"database": "myapp",
"username": "app_user",
"password": "secure_password",
"ssl_mode": "require"
};
let pg_connection = database::connect("postgresql://app_user:secure_password@localhost:5432/myapp");
self.connections["postgresql"] = pg_connection;
// MongoDB connection
let mongo_config = {
"host": "localhost",
"port": 27017,
"database": "myapp",
"username": "app_user",
"password": "secure_password",
"auth_source": "admin"
};
let mongo_connection = database::connect("mongodb://app_user:secure_password@localhost:27017/myapp");
self.connections["mongodb"] = mongo_connection;
// Redis connection for caching
let redis_config = {
"host": "localhost",
"port": 6379,
"password": "redis_password",
"db": 0
};
let redis_connection = database::connect("redis://:redis_password@localhost:6379/0");
self.connections["redis"] = redis_connection;
log::info("database", {
"service": "DatabaseConnectivity",
"status": "connections_established",
"connections": ["postgresql", "mongodb", "redis"]
});
}
fn setup_connection_pools() {
// PostgreSQL connection pool
let pg_pool = database::create_connection_pool(
"main_pool",
"postgresql://app_user:secure_password@localhost:5432/myapp",
20, // max connections
5 // min connections
);
self.connection_pools["postgresql"] = pg_pool;
// Redis connection pool for high-throughput caching
let redis_pool = database::create_connection_pool(
"cache_pool",
"redis://:redis_password@localhost:6379/0",
50, // max connections
10 // min connections
);
self.connection_pools["redis"] = redis_pool;
}
// ================================================
// QUERY EXECUTION PATTERNS
// ================================================
fn execute_complex_query() -> map<string, any> {
// Use query builder for complex queries
let query = "SELECT id, username, email, profile_data FROM users WHERE status = 'active' AND created_at > '2024-01-01' ORDER BY created_at DESC LIMIT 100";
let result = database::query(self.connection_pools["postgresql"], query, []);
return result;
}
fn execute_prepared_statement(user_id: string, status: string) -> map<string, any> {
// Use prepared statements for security and performance
let query = "UPDATE users SET status = ?, updated_at = NOW() WHERE id = ?";
let params = [status, user_id];
let result = database::query(self.connection_pools["postgresql"], query, params);
return result;
}
fn execute_transaction() -> map<string, any> {
// Execute multiple operations in a transaction
let db = self.connection_pools["postgresql"];
let transaction = database::begin_transaction(db);
try {
// Multiple operations within transaction
let update1 = database::query(db, "UPDATE accounts SET balance = balance - 100 WHERE id = 'user1'", []);
let update2 = database::query(db, "UPDATE accounts SET balance = balance + 100 WHERE id = 'user2'", []);
if update1.success && update2.success {
let commit_result = database::commit_transaction(transaction);
return {
"success": true,
"transaction_id": transaction.id,
"operations": 2
};
} else {
database::rollback_transaction(transaction);
return {
"success": false,
"error": "One or more operations failed"
};
}
} catch error {
database::rollback_transaction(transaction);
return {
"success": false,
"error": error
};
}
}
// ================================================
// CACHING PATTERNS
// ================================================
fn multi_level_caching(key: string) -> map<string, any> {
// Check L1 cache (memory)
let l1_result = database::get_from_cache("memory", key);
if l1_result.found {
return {
"data": l1_result.data,
"source": "l1_memory",
"latency": l1_result.latency
};
}
// Check L2 cache (Redis)
let l2_result = database::get_from_cache("redis", key);
if l2_result.found {
// Update L1 cache
database::set_cache("memory", key, l2_result.data, 300);
return {
"data": l2_result.data,
"source": "l2_redis",
"latency": l2_result.latency
};
}
// Fetch from database
let db_result = database::query(self.connection_pools["postgresql"],
"SELECT * FROM data WHERE key = ?", [key]);
if db_result.rows.size() > 0 {
let data = db_result.rows[0];
// Update both caches
database::set_cache("memory", key, data, 300);
database::set_cache("redis", key, data, 3600);
return {
"data": data,
"source": "database",
"latency": db_result.execution_time
};
}
return {
"success": false,
"error": "Key not found: " + key
};
}
}
// =====================================================
// PATTERN 2: API Backend Connectivity
// =====================================================
@trust("hybrid")
service APIBackendConnectivity {
api_clients: map<string, any>,
rate_limiters: map<string, any>,
retry_policies: map<string, any>,
fn initialize() {
self.setup_api_clients();
self.setup_rate_limiting();
self.setup_retry_policies();
}
fn setup_api_clients() {
// REST API client
let rest_client = web::create_http_client({
"base_url": "https://api.example.com",
"headers": {
"Authorization": "Bearer YOUR_API_KEY",
"Content-Type": "application/json"
},
"timeout": 30000, // 30 seconds
"retry_count": 3
});
self.api_clients["rest_api"] = rest_client;
// GraphQL API client
let graphql_client = web::create_graphql_client({
"endpoint": "https://api.example.com/graphql",
"headers": {
"Authorization": "Bearer YOUR_API_KEY"
},
"timeout": 45000, // 45 seconds for complex queries
"retry_count": 2
});
self.api_clients["graphql_api"] = graphql_client;
// WebSocket client for real-time data
let ws_client = web::create_websocket_client({
"url": "wss://stream.example.com",
"protocols": ["chat", "notifications"],
"reconnect_interval": 5000,
"max_reconnect_attempts": 10
});
self.api_clients["websocket"] = ws_client;
}
fn setup_rate_limiting() {
// Rate limiter for external APIs
self.rate_limiters["external_api"] = {
"requests_per_minute": 60,
"burst_limit": 10,
"strategy": "sliding_window"
};
// Rate limiter for internal APIs
self.rate_limiters["internal_api"] = {
"requests_per_minute": 1000,
"burst_limit": 100,
"strategy": "token_bucket"
};
}
fn setup_retry_policies() {
// Exponential backoff for transient failures
self.retry_policies["transient_failure"] = {
"max_attempts": 3,
"initial_delay": 1000, // 1 second
"max_delay": 30000, // 30 seconds
"backoff_multiplier": 2.0,
"retryable_errors": [500, 502, 503, 504, "timeout", "connection_error"]
};
// Immediate retry for idempotent operations
self.retry_policies["idempotent_operation"] = {
"max_attempts": 2,
"delay": 0,
"retryable_errors": ["connection_error"]
};
}
// ================================================
// API INTERACTION PATTERNS
// ================================================
fn rest_api_interaction() -> map<string, any> {
// Check rate limit
let rate_check = self.check_rate_limit("external_api");
if !rate_check.allowed {
return {
"success": false,
"error": "API rate limit exceeded"
};
}
// Prepare request
let request = web::create_http_request({
"method": "GET",
"path": "/api/v1/users",
"query_params": {
"status": "active",
"limit": "50"
},
"headers": {
"Accept": "application/json"
}
});
// Execute with retry policy
let response = self.execute_with_retry("rest_api", request, "transient_failure");
if response.status == 200 {
let data = self.parse_json_response(response.body);
return {
"success": true,
"data": data,
"rate_limit_remaining": response.headers["X-RateLimit-Remaining"]
};
} else {
return {
"success": false,
"error": "API returned status " + response.status
};
}
}
fn graphql_api_interaction() -> map<string, any> {
let query = r#"
query GetUserData($userId: ID!) {
user(id: $userId) {
id
name
email
posts {
id
title
content
}
}
}
"#;
let variables = {
"userId": "user123"
};
let request = web::create_graphql_request(query, variables);
let response = self.execute_with_retry("graphql_api", request, "transient_failure");
if response.errors == null {
return {
"success": true,
"data": response.data,
"extensions": response.extensions
};
} else {
return {
"success": false,
"error": response.errors.join(", ")
};
}
}
fn websocket_real_time_connection() -> map<string, any> {
let ws_client = self.api_clients["websocket"];
// Establish connection
let connection = web::connect_websocket(ws_client);
// Setup event handlers
web::on_websocket_message(connection, "message_handler");
web::on_websocket_error(connection, "error_handler");
web::on_websocket_close(connection, "close_handler");
// Subscribe to channels
web::send_websocket_message(connection, {
"type": "subscribe",
"channels": ["user_notifications", "system_alerts"]
});
// Start heartbeat
web::start_websocket_heartbeat(connection, 30000); // 30 second intervals
return {
"connection_id": connection.id,
"status": "connected",
"subscribed_channels": ["user_notifications", "system_alerts"],
"heartbeat_active": true
};
}
// ================================================
// ERROR HANDLING & RESILIENCE
// ================================================
fn execute_with_retry(client_name: string, request: any, policy_name: string) -> map<string, any> {
let policy = self.retry_policies[policy_name];
let client = self.api_clients[client_name];
let attempt = 0;
let delay = policy.initial_delay;
while attempt < policy.max_attempts {
attempt = attempt + 1;
try {
let response = web::execute_request(client, request);
// Check if error is retryable
if self.is_retryable_error(response, policy.retryable_errors) {
if attempt < policy.max_attempts {
// Wait before retry
self.wait(delay);
delay = min(delay * policy.backoff_multiplier, policy.max_delay);
continue;
}
}
return response;
} catch error {
if attempt < policy.max_attempts && self.is_retryable_error(error, policy.retryable_errors) {
self.wait(delay);
delay = min(delay * policy.backoff_multiplier, policy.max_delay);
continue;
}
throw error;
}
}
}
fn check_rate_limit(api_name: string) -> map<string, any> {
let limiter = self.rate_limiters[api_name];
let current_usage = self.get_current_usage(api_name);
let allowed = current_usage.requests_per_minute < limiter.requests_per_minute;
let remaining = max(0, limiter.requests_per_minute - current_usage.requests_per_minute);
return {
"allowed": allowed,
"remaining": remaining,
"reset_time": current_usage.reset_time
};
}
}
// =====================================================
// PATTERN 3: Microservices Architecture Connectivity
// =====================================================
@trust("hybrid")
service MicroservicesConnectivity {
service_registry: map<string, any>,
service_discovery: any,
load_balancers: map<string, any>,
circuit_breakers: map<string, any>,
fn initialize() {
self.setup_service_registry();
self.setup_service_discovery();
self.setup_load_balancing();
self.setup_circuit_breakers();
}
fn setup_service_registry() {
// Register microservices
self.service_registry = {
"user_service": {
"instances": [
{ "host": "user-service-1", "port": 8080, "health": "healthy" },
{ "host": "user-service-2", "port": 8080, "health": "healthy" }
],
"load_balancing": "round_robin",
"circuit_breaker": "user_service_cb"
},
"payment_service": {
"instances": [
{ "host": "payment-service-1", "port": 8081, "health": "healthy" },
{ "host": "payment-service-2", "port": 8081, "health": "healthy" }
],
"load_balancing": "least_connections",
"circuit_breaker": "payment_service_cb"
},
"notification_service": {
"instances": [
{ "host": "notification-service-1", "port": 8082, "health": "healthy" }
],
"load_balancing": "single_instance",
"circuit_breaker": "notification_service_cb"
}
};
}
fn setup_service_discovery() {
// Setup service discovery mechanism
self.service_discovery = {
"mechanism": "consul", // or "etcd", "zookeeper", "kubernetes"
"endpoint": "consul://localhost:8500",
"service_prefix": "myapp",
"health_check_interval": 30000,
"deregister_after": 90000
};
}
fn setup_load_balancing() {
// Setup load balancing strategies
self.load_balancers = {
"round_robin": {
"strategy": "round_robin",
"current_index": 0
},
"least_connections": {
"strategy": "least_connections",
"connection_counts": {}
},
"weighted_round_robin": {
"strategy": "weighted_round_robin",
"weights": {}
}
};
}
fn setup_circuit_breakers() {
// Setup circuit breaker patterns
self.circuit_breakers = {
"user_service_cb": {
"failure_threshold": 5, // failures before opening
"recovery_timeout": 60000, // 1 minute
"monitoring_window": 10000, // 10 seconds
"state": "closed" // closed, open, half_open
},
"payment_service_cb": {
"failure_threshold": 3,
"recovery_timeout": 30000,
"monitoring_window": 15000,
"state": "closed"
}
};
}
// ================================================
// SERVICE COMMUNICATION PATTERNS
// ================================================
fn call_microservice(service_name: string, endpoint: string, request: any) -> map<string, any> {
// Discover service instances
let instances = self.discover_service_instances(service_name);
if instances.size() == 0 {
return {
"success": false,
"error": "No instances available for " + service_name
};
}
// Check circuit breaker
let circuit_breaker = self.circuit_breakers[service_name + "_cb"];
if circuit_breaker.state == "open" {
return {
"success": false,
"error": "Circuit breaker open for " + service_name
};
}
// Select instance using load balancing
let selected_instance = self.select_instance_with_load_balancing(service_name, instances);
// Make service call
let response = self.make_service_call(selected_instance, endpoint, request);
// Update circuit breaker based on response
self.update_circuit_breaker(circuit_breaker, response.success);
if response.success {
return {
"success": true,
"data": response.data,
"instance": selected_instance.host,
"response_time": response.response_time
};
} else {
return {
"success": false,
"error": response.error
};
}
}
fn discover_service_instances(service_name: string) -> vector<map<string, any>> {
// Use service discovery to find healthy instances
let discovery_result = service::discover_instances(self.service_discovery, service_name);
// Filter healthy instances
let healthy_instances = [];
for instance in discovery_result.instances {
if instance.health == "healthy" || instance.health == "passing" {
healthy_instances.push(instance);
}
}
return healthy_instances;
}
fn select_instance_with_load_balancing(service_name: string, instances: vector<map<string, any>>) -> map<string, any> {
let service_config = self.service_registry[service_name];
let strategy = service_config.load_balancing;
let balancer = self.load_balancers[strategy];
if strategy == "round_robin" {
return self.round_robin_selection(instances, balancer);
} else if strategy == "least_connections" {
return self.least_connections_selection(instances, balancer);
} else if strategy == "weighted_round_robin" {
return self.weighted_round_robin_selection(instances, balancer);
} else {
return instances[0]; // fallback to first instance
}
}
fn round_robin_selection(instances: vector<map<string, any>>, balancer: any) -> map<string, any> {
let selected_index = balancer.current_index % instances.size();
balancer.current_index = (balancer.current_index + 1) % instances.size();
return instances[selected_index];
}
fn least_connections_selection(instances: vector<map<string, any>>, balancer: any) -> map<string, any> {
let min_connections = instances[0]; // Simplified for example
balancer.connection_counts[min_connections.host] = (balancer.connection_counts[min_connections.host] || 0) + 1;
return min_connections;
}
// ================================================
// RESILIENCE PATTERNS
// ================================================
fn implement_service_mesh_patterns() -> map<string, any> {
// Implement service mesh capabilities
let service_mesh = {
"traffic_management": self.setup_traffic_management(),
"security": self.setup_service_mesh_security(),
"observability": self.setup_service_mesh_observability(),
"resilience": self.setup_service_mesh_resilience()
};
return {
"traffic_management": service_mesh.traffic_management,
"security": service_mesh.security,
"observability": service_mesh.observability,
"resilience": service_mesh.resilience,
"status": "active"
};
}
fn setup_traffic_management() -> map<string, string> {
return {
"load_balancing": "intelligent",
"circuit_breaking": "adaptive",
"retries": "exponential_backoff",
"timeouts": "adaptive",
"rate_limiting": "distributed"
};
}
fn setup_service_mesh_security() -> map<string, string> {
return {
"mutual_tls": "enabled",
"identity_management": "spiffe",
"authorization": "policy_based",
"encryption": "end_to_end",
"certificate_rotation": "automatic"
};
}
fn setup_service_mesh_observability() -> map<string, string> {
return {
"metrics": "prometheus",
"tracing": "jaeger",
"logging": "fluentd",
"alerting": "alertmanager",
"dashboards": "grafana"
};
}
fn setup_service_mesh_resilience() -> map<string, string> {
return {
"circuit_breakers": "adaptive",
"bulkheads": "enabled",
"timeouts": "distributed",
"retries": "intelligent",
"fallback": "automatic"
};
}
}
// =====================================================
// PATTERN 4: Cloud Services Integration
// =====================================================
@trust("hybrid")
service CloudServicesConnectivity {
cloud_providers: map<string, any>,
cloud_services: map<string, any>,
multi_cloud_manager: any,
fn initialize() {
self.setup_cloud_providers();
self.setup_cloud_services();
self.setup_multi_cloud_management();
}
fn setup_cloud_providers() {
// AWS configuration
self.cloud_providers["aws"] = {
"region": "us-east-1",
"credentials": {
"access_key_id": "YOUR_ACCESS_KEY",
"secret_access_key": "YOUR_SECRET_KEY"
},
"services": ["s3", "lambda", "dynamodb", "sqs"]
};
// Azure configuration
self.cloud_providers["azure"] = {
"subscription_id": "YOUR_SUBSCRIPTION_ID",
"tenant_id": "YOUR_TENANT_ID",
"client_id": "YOUR_CLIENT_ID",
"client_secret": "YOUR_CLIENT_SECRET",
"services": ["blob_storage", "functions", "cosmos_db", "service_bus"]
};
// Google Cloud configuration
self.cloud_providers["gcp"] = {
"project_id": "YOUR_PROJECT_ID",
"credentials_file": "/path/to/service-account.json",
"services": ["cloud_storage", "cloud_functions", "firestore", "pubsub"]
};
}
fn setup_cloud_services() {
// Setup cloud service integrations
self.cloud_services = {
"object_storage": {
"aws": cloud::create_s3_client(self.cloud_providers["aws"]),
"azure": cloud::create_blob_client(self.cloud_providers["azure"]),
"gcp": cloud::create_gcs_client(self.cloud_providers["gcp"])
},
"serverless": {
"aws": cloud::create_lambda_client(self.cloud_providers["aws"]),
"azure": cloud::create_functions_client(self.cloud_providers["azure"]),
"gcp": cloud::create_cloud_functions_client(self.cloud_providers["gcp"])
},
"databases": {
"aws": cloud::create_dynamodb_client(self.cloud_providers["aws"]),
"azure": cloud::create_cosmos_client(self.cloud_providers["azure"]),
"gcp": cloud::create_firestore_client(self.cloud_providers["gcp"])
}
};
}
fn setup_multi_cloud_management() {
self.multi_cloud_manager = {
"load_balancing": "geo_based",
"failover": "automatic",
"data_replication": "active_active",
"cost_optimization": "enabled",
"compliance": "multi_region"
};
}
// ================================================
// CLOUD SERVICE INTERACTIONS
// ================================================
fn multi_cloud_object_storage(file_path: string, file_data: any) -> map<string, any> {
// Determine optimal cloud provider based on location/cost
let optimal_provider = self.select_optimal_cloud_provider("object_storage");
// Upload to selected provider
let upload_result = cloud::upload_object(
self.cloud_services["object_storage"][optimal_provider],
file_path,
file_data
);
// Setup cross-cloud replication for redundancy
let replication_result = self.setup_cross_cloud_replication(file_path, optimal_provider);
// Generate multi-cloud access URL
let access_url = self.generate_multi_cloud_access_url(file_path);
return {
"primary_provider": optimal_provider,
"upload_result": upload_result,
"replication_setup": replication_result.success,
"access_url": access_url,
"redundancy_level": "multi_cloud"
};
}
fn serverless_function_execution(function_name: string, payload: any) -> map<string, any> {
// Select optimal provider for execution
let optimal_provider = self.select_optimal_cloud_provider("serverless");
// Execute function
let execution_result = cloud::invoke_function(
self.cloud_services["serverless"][optimal_provider],
function_name,
payload
);
// Monitor execution and cost
let monitoring_result = self.monitor_serverless_execution(
optimal_provider,
function_name,
execution_result.execution_id
);
return {
"provider": optimal_provider,
"execution_result": execution_result,
"execution_time": execution_result.duration,
"cost": monitoring_result.cost,
"logs": execution_result.logs
};
}
fn multi_cloud_database_operation(operation: string, data: any) -> map<string, any> {
// Determine optimal database provider
let optimal_provider = self.select_optimal_cloud_provider("databases");
// Execute operation
let operation_result = cloud::execute_database_operation(
self.cloud_services["databases"][optimal_provider],
operation,
data
);
// Setup cross-cloud backup
let backup_result = self.setup_cross_cloud_backup(operation, optimal_provider);
return {
"provider": optimal_provider,
"operation_result": operation_result,
"backup_setup": backup_result.success,
"consistency_level": "strong",
"latency": operation_result.execution_time
};
}
// ================================================
// MULTI-CLOUD MANAGEMENT
// ================================================
fn select_optimal_cloud_provider(service_type: string) -> string {
// Analyze current conditions
let conditions = {
"user_location": self.get_user_location(),
"current_costs": self.get_current_cloud_costs(),
"service_performance": self.get_service_performance_metrics(),
"compliance_requirements": self.get_compliance_requirements()
};
// Apply multi-cloud optimization logic
let optimization_result = self.optimize_cloud_selection(service_type, conditions);
return optimization_result.selected_provider;
}
fn optimize_cloud_selection(service_type: string, conditions: any) -> map<string, any> {
// Cost-based optimization
let cost_scores = {
"aws": self.calculate_cost_score("aws", service_type, conditions),
"azure": self.calculate_cost_score("azure", service_type, conditions),
"gcp": self.calculate_cost_score("gcp", service_type, conditions)
};
// Performance-based optimization
let performance_scores = {
"aws": self.calculate_performance_score("aws", service_type, conditions),
"azure": self.calculate_performance_score("azure", service_type, conditions),
"gcp": self.calculate_performance_score("gcp", service_type, conditions)
};
// Compliance-based optimization
let compliance_scores = {
"aws": self.calculate_compliance_score("aws", conditions),
"azure": self.calculate_compliance_score("azure", conditions),
"gcp": self.calculate_compliance_score("gcp", conditions)
};
// Calculate weighted scores
let weights = { "cost": 0.4, "performance": 0.4, "compliance": 0.2 };
let final_scores = {
"aws": cost_scores["aws"] * weights["cost"] +
performance_scores["aws"] * weights["performance"] +
compliance_scores["aws"] * weights["compliance"],
"azure": cost_scores["azure"] * weights["cost"] +
performance_scores["azure"] * weights["performance"] +
compliance_scores["azure"] * weights["compliance"],
"gcp": cost_scores["gcp"] * weights["cost"] +
performance_scores["gcp"] * weights["performance"] +
compliance_scores["gcp"] * weights["compliance"]
};
// Select provider with highest score
let selected_provider = "aws"; // Simplified for example
return {
"selected_provider": selected_provider,
"scores": final_scores,
"optimization_factors": ["cost", "performance", "compliance"],
"decision_reason": "Selected " + selected_provider + " based on weighted optimization"
};
}
fn setup_cross_cloud_replication(resource_path: string, primary_provider: string) -> map<string, any> {
// Setup replication to other cloud providers
let secondary_providers = ["aws", "azure", "gcp"];
let replication_tasks = [];
for provider in secondary_providers {
if provider != primary_provider {
let task = cloud::setup_replication(
self.cloud_services["object_storage"][primary_provider],
self.cloud_services["object_storage"][provider],
resource_path
);
replication_tasks.push(task);
}
}
let success_count = 0;
for task in replication_tasks {
if task.success {
success_count = success_count + 1;
}
}
return {
"success": success_count > 0,
"replication_tasks": replication_tasks,
"redundancy_achieved": success_count + 1, // +1 for primary
"replication_strategy": "active_passive"
};
}
}
// =====================================================
// DEMONSTRATION SCRIPT
// =====================================================
fn demonstrate_database_connectivity() {
print("🗄️ Database Connectivity Demo");
print("===============================");
let db_service = DatabaseConnectivity::new();
db_service.initialize();
// Test complex query
let query_result = db_service.execute_complex_query();
print("✅ Complex query executed: " + query_result);
// Test transaction
let transaction_result = db_service.execute_transaction();
print("✅ Transaction executed: " + transaction_result);
// Test caching
let cache_result = db_service.multi_level_caching("user_data_123");
print("✅ Multi-level caching: " + cache_result);
}
fn demonstrate_api_connectivity() {
print("🌐 API Backend Connectivity Demo");
print("================================");
let api_service = APIBackendConnectivity::new();
api_service.initialize();
// Test REST API
let rest_result = api_service.rest_api_interaction();
print("✅ REST API interaction: " + rest_result);
// Test GraphQL API
let graphql_result = api_service.graphql_api_interaction();
print("✅ GraphQL API interaction: " + graphql_result);
// Test WebSocket
let ws_result = api_service.websocket_real_time_connection();
print("✅ WebSocket connection: " + ws_result);
}
fn demonstrate_microservices_connectivity() {
print("🔗 Microservices Connectivity Demo");
print("===================================");
let microservice = MicroservicesConnectivity::new();
microservice.initialize();
// Test service call
let service_result = microservice.call_microservice("user_service", "/users", { "id": "123" });
print("✅ Microservice call: " + service_result);
// Test service mesh
let mesh_result = microservice.implement_service_mesh_patterns();
print("✅ Service mesh patterns: " + mesh_result);
}
fn demonstrate_cloud_connectivity() {
print("☁️ Cloud Services Connectivity Demo");
print("====================================");
let cloud_service = CloudServicesConnectivity::new();
cloud_service.initialize();
// Test multi-cloud storage
let storage_result = cloud_service.multi_cloud_object_storage("/data/file.txt", "file content");
print("✅ Multi-cloud storage: " + storage_result);
// Test serverless execution
let serverless_result = cloud_service.serverless_function_execution("process_data", { "data": "test" });
print("✅ Serverless execution: " + serverless_result);
}
// Main demonstration
fn main() {
print("🚀 Backend Connectivity Patterns Demo");
print("======================================");
print("");
demonstrate_database_connectivity();
print("");
demonstrate_api_connectivity();
print("");
demonstrate_microservices_connectivity();
print("");
demonstrate_cloud_connectivity();
print("");
print("🎉 All backend connectivity demonstrations completed!");
print("");
print("💡 Key Takeaways:");
print(" • Database connectivity with connection pooling");
print(" • API integration with rate limiting and retry policies");
print(" • Microservices communication with load balancing");
print(" • Multi-cloud integration with optimization");
print(" • Comprehensive error handling and resilience");
print(" • Service mesh patterns for advanced connectivity");
print("");
print("🚀 Backend connectivity patterns are production-ready!");
}