🏢 Enterprise Patterns with TuskLang Java

"We don't bow to any king" - Enterprise Java Edition

TuskLang Java brings enterprise-grade patterns to configuration management, enabling microservices, distributed systems, and scalable architectures with the power of executable configuration.

🎯 Enterprise Architecture Overview

Microservices Configuration Pattern

// app.tsk - Main application configuration
[application]
name: "Enterprise TuskLang App"
version: "2.1.0"
environment: @env("APP_ENV", "development")
[services]
auth_service: {
    host: "auth-service.internal"
    port: 8081
    health_check: "/health"
    circuit_breaker: {
        failure_threshold: 5
        recovery_timeout: "30s"
    }
}
user_service: {
    host: "user-service.internal"
    port: 8082
    health_check: "/health"
    load_balancer: "round-robin"
}
payment_service: {
    host: "payment-service.internal"
    port: 8083
    health_check: "/health"
    retry_policy: {
        max_attempts: 3
        backoff: "exponential"
    }
}
[databases]
primary: {
    type: "postgresql"
    host: @env("DB_HOST", "localhost")
    port: @env("DB_PORT", "5432")
    name: @env("DB_NAME", "enterprise_app")
    user: @env("DB_USER", "app_user")
    password: @env.secure("DB_PASSWORD")
    pool_size: 20
    connection_timeout: "30s"
}
cache: {
    type: "redis"
    host: @env("REDIS_HOST", "localhost")
    port: @env("REDIS_PORT", "6379")
    password: @env.secure("REDIS_PASSWORD")
    ttl: "1h"
}
[monitoring]
metrics: {
    enabled: true
    endpoint: "/metrics"
    prometheus: true
    custom_metrics: [
        "request_duration",
        "error_rate",
        "active_connections"
    ]
}
logging: {
    level: @env("LOG_LEVEL", "INFO")
    format: "json"
    output: "stdout"
    retention: "30d"
}
[security]
jwt: {
    secret: @env.secure("JWT_SECRET")
    expiration: "24h"
    refresh_expiration: "7d"
}
oauth: {
    google: {
        client_id: @env.secure("GOOGLE_CLIENT_ID")
        client_secret: @env.secure("GOOGLE_CLIENT_SECRET")
        redirect_uri: @env("GOOGLE_REDIRECT_URI")
    }
    github: {
        client_id: @env.secure("GITHUB_CLIENT_ID")
        client_secret: @env.secure("GITHUB_CLIENT_SECRET")
        redirect_uri: @env("GITHUB_REDIRECT_URI")
    }
}

🏗️ Spring Boot Enterprise Integration

Application Configuration Class

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.tusklang.java.annotations.TuskConfig;
import java.util.Map;
import java.util.List;
@Configuration
@ConfigurationProperties(prefix = "application")
@TuskConfig
public class EnterpriseApplicationConfig {
    
    private String name;
    private String version;
    private String environment;
    
    private Map<String, ServiceConfig> services;
    private Map<String, DatabaseConfig> databases;
    private MonitoringConfig monitoring;
    private SecurityConfig security;
    
    // Getters and setters
    public String getName() { return name; }
    public void setName(String name) { this.name = name; }
    
    public String getVersion() { return version; }
    public void setVersion(String version) { this.version = version; }
    
    public String getEnvironment() { return environment; }
    public void setEnvironment(String environment) { this.environment = environment; }
    
    public Map<String, ServiceConfig> getServices() { return services; }
    public void setServices(Map<String, ServiceConfig> services) { this.services = services; }
    
    public Map<String, DatabaseConfig> getDatabases() { return databases; }
    public void setDatabases(Map<String, DatabaseConfig> databases) { this.databases = databases; }
    
    public MonitoringConfig getMonitoring() { return monitoring; }
    public void setMonitoring(MonitoringConfig monitoring) { this.monitoring = monitoring; }
    
    public SecurityConfig getSecurity() { return security; }
    public void setSecurity(SecurityConfig security) { this.security = security; }
}
@TuskConfig
public class ServiceConfig {
    private String host;
    private int port;
    private String healthCheck;
    private CircuitBreakerConfig circuitBreaker;
    private LoadBalancerConfig loadBalancer;
    private RetryPolicyConfig retryPolicy;
    
    // Getters and setters
    public String getHost() { return host; }
    public void setHost(String host) { this.host = host; }
    
    public int getPort() { return port; }
    public void setPort(int port) { this.port = port; }
    
    public String getHealthCheck() { return healthCheck; }
    public void setHealthCheck(String healthCheck) { this.healthCheck = healthCheck; }
    
    public CircuitBreakerConfig getCircuitBreaker() { return circuitBreaker; }
    public void setCircuitBreaker(CircuitBreakerConfig circuitBreaker) { this.circuitBreaker = circuitBreaker; }
    
    public LoadBalancerConfig getLoadBalancer() { return loadBalancer; }
    public void setLoadBalancer(LoadBalancerConfig loadBalancer) { this.loadBalancer = loadBalancer; }
    
    public RetryPolicyConfig getRetryPolicy() { return retryPolicy; }
    public void setRetryPolicy(RetryPolicyConfig retryPolicy) { this.retryPolicy = retryPolicy; }
}
@TuskConfig
public class CircuitBreakerConfig {
    private int failureThreshold;
    private String recoveryTimeout;
    
    // Getters and setters
    public int getFailureThreshold() { return failureThreshold; }
    public void setFailureThreshold(int failureThreshold) { this.failureThreshold = failureThreshold; }
    
    public String getRecoveryTimeout() { return recoveryTimeout; }
    public void setRecoveryTimeout(String recoveryTimeout) { this.recoveryTimeout = recoveryTimeout; }
}
@TuskConfig
public class LoadBalancerConfig {
    private String strategy;
    private List<String> instances;
    
    // Getters and setters
    public String getStrategy() { return strategy; }
    public void setStrategy(String strategy) { this.strategy = strategy; }
    
    public List<String> getInstances() { return instances; }
    public void setInstances(List<String> instances) { this.instances = instances; }
}
@TuskConfig
public class RetryPolicyConfig {
    private int maxAttempts;
    private String backoff;
    private String initialDelay;
    
    // Getters and setters
    public int getMaxAttempts() { return maxAttempts; }
    public void setMaxAttempts(int maxAttempts) { this.maxAttempts = maxAttempts; }
    
    public String getBackoff() { return backoff; }
    public void setBackoff(String backoff) { this.backoff = backoff; }
    
    public String getInitialDelay() { return initialDelay; }
    public void setInitialDelay(String initialDelay) { this.initialDelay = initialDelay; }
}

Database Configuration

@TuskConfig
public class DatabaseConfig {
    private String type;
    private String host;
    private int port;
    private String name;
    private String user;
    private String password;
    private int poolSize;
    private String connectionTimeout;
    
    // Getters and setters
    public String getType() { return type; }
    public void setType(String type) { this.type = type; }
    
    public String getHost() { return host; }
    public void setHost(String host) { this.host = host; }
    
    public int getPort() { return port; }
    public void setPort(int port) { this.port = port; }
    
    public String getName() { return name; }
    public void setName(String name) { this.name = name; }
    
    public String getUser() { return user; }
    public void setUser(String user) { this.user = user; }
    
    public String getPassword() { return password; }
    public void setPassword(String password) { this.password = password; }
    
    public int getPoolSize() { return poolSize; }
    public void setPoolSize(int poolSize) { this.poolSize = poolSize; }
    
    public String getConnectionTimeout() { return connectionTimeout; }
    public void setConnectionTimeout(String connectionTimeout) { this.connectionTimeout = connectionTimeout; }
}

🔄 Service Discovery and Load Balancing

Service Registry Configuration

// service-registry.tsk
[registry]
type: "consul"
host: @env("CONSUL_HOST", "localhost")
port: @env("CONSUL_PORT", "8500")
token: @env.secure("CONSUL_TOKEN")
[services]
auth_service: {
    name: "auth-service"
    tags: ["auth", "security", "api"]
    health_check: {
        path: "/health"
        interval: "10s"
        timeout: "5s"
        deregister_after: "1m"
    }
    load_balancer: {
        strategy: "least_connections"
        health_check: true
        retry_policy: {
            max_attempts: 3
            backoff: "exponential"
        }
    }
}
user_service: {
    name: "user-service"
    tags: ["user", "profile", "api"]
    health_check: {
        path: "/health"
        interval: "10s"
        timeout: "5s"
        deregister_after: "1m"
    }
    load_balancer: {
        strategy: "round_robin"
        health_check: true
        retry_policy: {
            max_attempts: 3
            backoff: "exponential"
        }
    }
}

Service Discovery Implementation

import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
import org.tusklang.java.annotations.TuskConfig;
@Configuration
@TuskConfig
public class ServiceDiscoveryConfig {
    
    @Bean
    @LoadBalanced
    public RestTemplate loadBalancedRestTemplate() {
        return new RestTemplate();
    }
    
    @Bean
    public ServiceRegistry serviceRegistry(DiscoveryClient discoveryClient) {
        return new ServiceRegistry(discoveryClient);
    }
}
@Component
public class ServiceRegistry {
    
    private final DiscoveryClient discoveryClient;
    private final Map<String, ServiceConfig> serviceConfigs;
    
    public ServiceRegistry(DiscoveryClient discoveryClient, 
                          Map<String, ServiceConfig> serviceConfigs) {
        this.discoveryClient = discoveryClient;
        this.serviceConfigs = serviceConfigs;
    }
    
    public ServiceInstance getServiceInstance(String serviceName) {
        List<ServiceInstance> instances = discoveryClient.getInstances(serviceName);
        
        if (instances.isEmpty()) {
            throw new ServiceNotFoundException("No instances found for service: " + serviceName);
        }
        
        ServiceConfig config = serviceConfigs.get(serviceName);
        if (config != null && config.getLoadBalancer() != null) {
            return selectInstance(instances, config.getLoadBalancer());
        }
        
        // Default to round-robin
        return instances.get(0);
    }
    
    private ServiceInstance selectInstance(List<ServiceInstance> instances, 
                                         LoadBalancerConfig config) {
        switch (config.getStrategy()) {
            case "round_robin":
                return roundRobinSelect(instances);
            case "least_connections":
                return leastConnectionsSelect(instances);
            case "random":
                return randomSelect(instances);
            default:
                return instances.get(0);
        }
    }
    
    private ServiceInstance roundRobinSelect(List<ServiceInstance> instances) {
        // Implementation for round-robin selection
        return instances.get(0);
    }
    
    private ServiceInstance leastConnectionsSelect(List<ServiceInstance> instances) {
        // Implementation for least connections selection
        return instances.get(0);
    }
    
    private ServiceInstance randomSelect(List<ServiceInstance> instances) {
        // Implementation for random selection
        return instances.get(0);
    }
}

🔒 Security and Authentication

JWT Configuration

// security.tsk
[jwt]
secret: @env.secure("JWT_SECRET")
algorithm: "HS256"
expiration: "24h"
refresh_expiration: "7d"
issuer: @env("JWT_ISSUER", "enterprise-app")
audience: @env("JWT_AUDIENCE", "enterprise-users")
[oauth]
providers: {
    google: {
        client_id: @env.secure("GOOGLE_CLIENT_ID")
        client_secret: @env.secure("GOOGLE_CLIENT_SECRET")
        redirect_uri: @env("GOOGLE_REDIRECT_URI")
        scopes: ["openid", "email", "profile"]
        authorization_endpoint: "https://accounts.google.com/o/oauth2/auth"
        token_endpoint: "https://oauth2.googleapis.com/token"
        userinfo_endpoint: "https://www.googleapis.com/oauth2/v3/userinfo"
    }
    
    github: {
        client_id: @env.secure("GITHUB_CLIENT_ID")
        client_secret: @env.secure("GITHUB_CLIENT_SECRET")
        redirect_uri: @env("GITHUB_REDIRECT_URI")
        scopes: ["read:user", "user:email"]
        authorization_endpoint: "https://github.com/login/oauth/authorize"
        token_endpoint: "https://github.com/login/oauth/access_token"
        userinfo_endpoint: "https://api.github.com/user"
    }
}
[saml]
idp: {
    entity_id: @env("SAML_IDP_ENTITY_ID")
    sso_url: @env("SAML_IDP_SSO_URL")
    certificate: @file.read("saml/idp-certificate.pem")
    name_id_format: "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
}
sp: {
    entity_id: @env("SAML_SP_ENTITY_ID")
    acs_url: @env("SAML_SP_ACS_URL")
    certificate: @file.read("saml/sp-certificate.pem")
    private_key: @file.read("saml/sp-private-key.pem")
}

Security Configuration Implementation

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.tusklang.java.annotations.TuskConfig;
@Configuration
@EnableWebSecurity
@TuskConfig
public class SecurityConfig {
    
    private final JwtConfig jwtConfig;
    private final OAuthConfig oauthConfig;
    private final SamlConfig samlConfig;
    
    public SecurityConfig(JwtConfig jwtConfig, OAuthConfig oauthConfig, SamlConfig samlConfig) {
        this.jwtConfig = jwtConfig;
        this.oauthConfig = oauthConfig;
        this.samlConfig = samlConfig;
    }
    
    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
            .csrf(csrf -> csrf.disable())
            .sessionManagement(session -> 
                session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
            .authorizeHttpRequests(authz -> authz
                .requestMatchers("/public/**").permitAll()
                .requestMatchers("/health/**").permitAll()
                .requestMatchers("/metrics/**").hasRole("ADMIN")
                .anyRequest().authenticated()
            )
            .addFilterBefore(jwtAuthenticationFilter(), 
                           UsernamePasswordAuthenticationFilter.class)
            .oauth2Login(oauth2 -> oauth2
                .clientRegistrationRepository(clientRegistrationRepository())
                .userInfoEndpoint(userInfo -> userInfo
                    .userService(oauth2UserService())
                )
            );
        
        return http.build();
    }
    
    @Bean
    public JwtAuthenticationFilter jwtAuthenticationFilter() {
        return new JwtAuthenticationFilter(jwtConfig);
    }
    
    @Bean
    public ClientRegistrationRepository clientRegistrationRepository() {
        return new InMemoryClientRegistrationRepository(
            googleClientRegistration(),
            githubClientRegistration()
        );
    }
    
    private ClientRegistration googleClientRegistration() {
        OAuthConfig.Google google = oauthConfig.getProviders().get("google");
        return ClientRegistration.withRegistrationId("google")
            .clientId(google.getClientId())
            .clientSecret(google.getClientSecret())
            .redirectUri(google.getRedirectUri())
            .scope(google.getScopes().toArray(new String[0]))
            .authorizationUri(google.getAuthorizationEndpoint())
            .tokenUri(google.getTokenEndpoint())
            .userInfoUri(google.getUserinfoEndpoint())
            .userNameAttributeName("sub")
            .clientName("Google")
            .build();
    }
    
    private ClientRegistration githubClientRegistration() {
        OAuthConfig.Github github = oauthConfig.getProviders().get("github");
        return ClientRegistration.withRegistrationId("github")
            .clientId(github.getClientId())
            .clientSecret(github.getClientSecret())
            .redirectUri(github.getRedirectUri())
            .scope(github.getScopes().toArray(new String[0]))
            .authorizationUri(github.getAuthorizationEndpoint())
            .tokenUri(github.getTokenEndpoint())
            .userInfoUri(github.getUserinfoEndpoint())
            .userNameAttributeName("login")
            .clientName("GitHub")
            .build();
    }
}

📊 Monitoring and Observability

Metrics Configuration

// monitoring.tsk
[metrics]
enabled: true
endpoint: "/metrics"
prometheus: true
custom_metrics: [
    "request_duration",
    "error_rate", 
    "active_connections",
    "cache_hit_rate",
    "database_queries_per_second"
]
[distributed_tracing]
enabled: true
sampling_rate: 0.1
exporter: "jaeger"
endpoint: @env("JAEGER_ENDPOINT", "http://localhost:14268/api/traces")
[health_checks]
liveness: {
    path: "/health/live"
    timeout: "5s"
    initial_delay: "30s"
    period: "10s"
}
readiness: {
    path: "/health/ready"
    timeout: "5s"
    initial_delay: "5s"
    period: "5s"
}
startup: {
    path: "/health/startup"
    timeout: "5s"
    initial_delay: "0s"
    period: "10s"
}
[logging]
level: @env("LOG_LEVEL", "INFO")
format: "json"
output: "stdout"
retention: "30d"
correlation_id: true
user_context: true
[alerts]
rules: [
    {
        name: "high_error_rate"
        condition: "error_rate > 0.05"
        duration: "5m"
        severity: "critical"
        notification: {
            email: ["admin@company.com"]
            slack: "#alerts"
            pagerduty: "PAGERDUTY_KEY"
        }
    },
    {
        name: "high_response_time"
        condition: "p95_response_time > 1000ms"
        duration: "5m"
        severity: "warning"
        notification: {
            email: ["dev@company.com"]
            slack: "#performance"
        }
    }
]

Monitoring Implementation

import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Timer;
import io.micrometer.core.instrument.Counter;
import org.springframework.stereotype.Component;
import org.tusklang.java.annotations.TuskConfig;
@Component
@TuskConfig
public class MetricsService {
    
    private final MeterRegistry meterRegistry;
    private final Map<String, Timer> timers;
    private final Map<String, Counter> counters;
    
    public MetricsService(MeterRegistry meterRegistry) {
        this.meterRegistry = meterRegistry;
        this.timers = new ConcurrentHashMap<>();
        this.counters = new ConcurrentHashMap<>();
    }
    
    public Timer.Sample startTimer(String name) {
        Timer timer = timers.computeIfAbsent(name, 
            k -> Timer.builder(name).register(meterRegistry));
        return Timer.start(meterRegistry);
    }
    
    public void stopTimer(Timer.Sample sample, String name) {
        Timer timer = timers.get(name);
        if (timer != null) {
            sample.stop(timer);
        }
    }
    
    public void incrementCounter(String name) {
        Counter counter = counters.computeIfAbsent(name,
            k -> Counter.builder(name).register(meterRegistry));
        counter.increment();
    }
    
    public void incrementCounter(String name, double amount) {
        Counter counter = counters.computeIfAbsent(name,
            k -> Counter.builder(name).register(meterRegistry));
        counter.increment(amount);
    }
    
    public void recordGauge(String name, double value) {
        meterRegistry.gauge(name, value);
    }
}
@Component
public class HealthIndicator implements org.springframework.boot.actuate.health.HealthIndicator {
    
    private final DatabaseHealthChecker databaseHealthChecker;
    private final ServiceHealthChecker serviceHealthChecker;
    
    public HealthIndicator(DatabaseHealthChecker databaseHealthChecker,
                          ServiceHealthChecker serviceHealthChecker) {
        this.databaseHealthChecker = databaseHealthChecker;
        this.serviceHealthChecker = serviceHealthChecker;
    }
    
    @Override
    public Health health() {
        try {
            // Check database health
            boolean dbHealthy = databaseHealthChecker.isHealthy();
            
            // Check service dependencies
            boolean servicesHealthy = serviceHealthChecker.areHealthy();
            
            if (dbHealthy && servicesHealthy) {
                return Health.up()
                    .withDetail("database", "UP")
                    .withDetail("services", "UP")
                    .build();
            } else {
                return Health.down()
                    .withDetail("database", dbHealthy ? "UP" : "DOWN")
                    .withDetail("services", servicesHealthy ? "UP" : "DOWN")
                    .build();
            }
        } catch (Exception e) {
            return Health.down()
                .withException(e)
                .build();
        }
    }
}

🚀 Deployment and DevOps

Kubernetes Configuration

deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: enterprise-tusklang-app
  labels:
    app: enterprise-tusklang-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: enterprise-tusklang-app
  template:
    metadata:
      labels:
        app: enterprise-tusklang-app
    spec:
      containers:
      - name: app
        image: enterprise-tusklang-app:latest
        ports:
        - containerPort: 8080
        env:
        - name: APP_ENV
          value: "production"
        - name: DB_HOST
          valueFrom:
            secretKeyRef:
              name: db-secret
              key: host
        - name: DB_PASSWORD
          valueFrom:
            secretKeyRef:
              name: db-secret
              key: password
        - name: JWT_SECRET
          valueFrom:
            secretKeyRef:
              name: jwt-secret
              key: secret
        volumeMounts:
        - name: config-volume
          mountPath: /app/config
        livenessProbe:
          httpGet:
            path: /health/live
            port: 8080
          initialDelaySeconds: 30
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /health/ready
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 5
      volumes:
      - name: config-volume
        configMap:
          name: app-config

Docker Configuration

Dockerfile
FROM openjdk:17-jdk-slim
WORKDIR /app
Copy application JAR
COPY target/enterprise-tusklang-app.jar app.jar
Copy TuskLang configuration
COPY config/ config/
Create non-root user
RUN groupadd -r appuser && useradd -r -g appuser appuser
USER appuser
Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD curl -f http://localhost:8080/health/live || exit 1
Expose port
EXPOSE 8080
Run application
ENTRYPOINT ["java", "-jar", "app.jar"]

🔧 Best Practices

1. Configuration Management

- Use environment-specific configuration files - Implement configuration validation - Use secure environment variables for sensitive data - Implement configuration hot-reloading

2. Service Communication

- Implement circuit breakers for resilience - Use retry policies with exponential backoff - Implement proper timeout handling - Use health checks for service discovery

3. Security

- Use JWT for stateless authentication - Implement OAuth2 for third-party authentication - Use SAML for enterprise SSO - Implement proper CORS policies

4. Monitoring

- Use distributed tracing for request tracking - Implement comprehensive health checks - Use structured logging with correlation IDs - Set up proper alerting rules

5. Performance

- Use connection pooling for databases - Implement caching strategies - Use load balancing for horizontal scaling - Monitor and optimize response times

🎯 Summary

TuskLang Java enterprise patterns provide:

- Microservices Architecture: Service discovery, load balancing, and circuit breakers - Security Integration: JWT, OAuth2, and SAML support - Monitoring & Observability: Metrics, tracing, and health checks - DevOps Integration: Kubernetes and Docker support - Enterprise Features: High availability, scalability, and resilience

The combination of TuskLang's executable configuration with Java's enterprise capabilities creates a powerful platform for building scalable, maintainable, and secure applications.

"We don't bow to any king" - Build enterprise applications that scale with confidence!