🌐 Distributed Systems with TuskLang Java

"We don't bow to any king" - Distributed Edition

TuskLang Java enables sophisticated distributed systems with built-in support for service discovery, load balancing, distributed caching, and fault tolerance. Build resilient microservices that communicate seamlessly across your infrastructure.

🎯 Distributed Architecture Overview

Service Mesh Configuration

import org.tusklang.java.TuskLang;
import org.tusklang.java.config.TuskConfig;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class DistributedServiceApplication {
    
    @Bean
    public TuskConfig tuskConfig() {
        TuskLang parser = new TuskLang();
        return parser.parseFile("distributed-service.tsk", TuskConfig.class);
    }
    
    public static void main(String[] args) {
        SpringApplication.run(DistributedServiceApplication.class, args);
    }
}
// Distributed service configuration
@TuskConfig
public class DistributedServiceConfig {
    private String serviceName;
    private String version;
    private ServiceMeshConfig serviceMesh;
    private LoadBalancerConfig loadBalancer;
    private CircuitBreakerConfig circuitBreaker;
    private DistributedCacheConfig cache;
    private MessageQueueConfig messageQueue;
    
    // Getters and setters
    public String getServiceName() { return serviceName; }
    public void setServiceName(String serviceName) { this.serviceName = serviceName; }
    
    public String getVersion() { return version; }
    public void setVersion(String version) { this.version = version; }
    
    public ServiceMeshConfig getServiceMesh() { return serviceMesh; }
    public void setServiceMesh(ServiceMeshConfig serviceMesh) { this.serviceMesh = serviceMesh; }
    
    public LoadBalancerConfig getLoadBalancer() { return loadBalancer; }
    public void setLoadBalancer(LoadBalancerConfig loadBalancer) { this.loadBalancer = loadBalancer; }
    
    public CircuitBreakerConfig getCircuitBreaker() { return circuitBreaker; }
    public void setCircuitBreaker(CircuitBreakerConfig circuitBreaker) { this.circuitBreaker = circuitBreaker; }
    
    public DistributedCacheConfig getCache() { return cache; }
    public void setCache(DistributedCacheConfig cache) { this.cache = cache; }
    
    public MessageQueueConfig getMessageQueue() { return messageQueue; }
    public void setMessageQueue(MessageQueueConfig messageQueue) { this.messageQueue = messageQueue; }
}
@TuskConfig
public class ServiceMeshConfig {
    private String istioUrl;
    private String namespace;
    private String serviceAccount;
    private Map<String, String> labels;
    private TrafficConfig traffic;
    
    // Getters and setters
    public String getIstioUrl() { return istioUrl; }
    public void setIstioUrl(String istioUrl) { this.istioUrl = istioUrl; }
    
    public String getNamespace() { return namespace; }
    public void setNamespace(String namespace) { this.namespace = namespace; }
    
    public String getServiceAccount() { return serviceAccount; }
    public void setServiceAccount(String serviceAccount) { this.serviceAccount = serviceAccount; }
    
    public Map<String, String> getLabels() { return labels; }
    public void setLabels(Map<String, String> labels) { this.labels = labels; }
    
    public TrafficConfig getTraffic() { return traffic; }
    public void setTraffic(TrafficConfig traffic) { this.traffic = traffic; }
}
@TuskConfig
public class TrafficConfig {
    private String routingStrategy;
    private Map<String, Double> weightDistribution;
    private RetryConfig retry;
    private TimeoutConfig timeout;
    
    // Getters and setters
    public String getRoutingStrategy() { return routingStrategy; }
    public void setRoutingStrategy(String routingStrategy) { this.routingStrategy = routingStrategy; }
    
    public Map<String, Double> getWeightDistribution() { return weightDistribution; }
    public void setWeightDistribution(Map<String, Double> weightDistribution) { this.weightDistribution = weightDistribution; }
    
    public RetryConfig getRetry() { return retry; }
    public void setRetry(RetryConfig retry) { this.retry = retry; }
    
    public TimeoutConfig getTimeout() { return timeout; }
    public void setTimeout(TimeoutConfig timeout) { this.timeout = timeout; }
}
@TuskConfig
public class RetryConfig {
    private int maxAttempts;
    private long initialDelay;
    private long maxDelay;
    private double multiplier;
    private List<String> retryableExceptions;
    
    // Getters and setters
    public int getMaxAttempts() { return maxAttempts; }
    public void setMaxAttempts(int maxAttempts) { this.maxAttempts = maxAttempts; }
    
    public long getInitialDelay() { return initialDelay; }
    public void setInitialDelay(long initialDelay) { this.initialDelay = initialDelay; }
    
    public long getMaxDelay() { return maxDelay; }
    public void setMaxDelay(long maxDelay) { this.maxDelay = maxDelay; }
    
    public double getMultiplier() { return multiplier; }
    public void setMultiplier(double multiplier) { this.multiplier = multiplier; }
    
    public List<String> getRetryableExceptions() { return retryableExceptions; }
    public void setRetryableExceptions(List<String> retryableExceptions) { this.retryableExceptions = retryableExceptions; }
}
@TuskConfig
public class TimeoutConfig {
    private long connectionTimeout;
    private long readTimeout;
    private long writeTimeout;
    private long idleTimeout;
    
    // Getters and setters
    public long getConnectionTimeout() { return connectionTimeout; }
    public void setConnectionTimeout(long connectionTimeout) { this.connectionTimeout = connectionTimeout; }
    
    public long getReadTimeout() { return readTimeout; }
    public void setReadTimeout(long readTimeout) { this.readTimeout = readTimeout; }
    
    public long getWriteTimeout() { return writeTimeout; }
    public void setWriteTimeout(long writeTimeout) { this.writeTimeout = writeTimeout; }
    
    public long getIdleTimeout() { return idleTimeout; }
    public void setIdleTimeout(long idleTimeout) { this.idleTimeout = idleTimeout; }
}
@TuskConfig
public class LoadBalancerConfig {
    private String algorithm;
    private int maxConnections;
    private boolean healthCheckEnabled;
    private String healthCheckPath;
    private int healthCheckInterval;
    
    // Getters and setters
    public String getAlgorithm() { return algorithm; }
    public void setAlgorithm(String algorithm) { this.algorithm = algorithm; }
    
    public int getMaxConnections() { return maxConnections; }
    public void setMaxConnections(int maxConnections) { this.maxConnections = maxConnections; }
    
    public boolean isHealthCheckEnabled() { return healthCheckEnabled; }
    public void setHealthCheckEnabled(boolean healthCheckEnabled) { this.healthCheckEnabled = healthCheckEnabled; }
    
    public String getHealthCheckPath() { return healthCheckPath; }
    public void setHealthCheckPath(String healthCheckPath) { this.healthCheckPath = healthCheckPath; }
    
    public int getHealthCheckInterval() { return healthCheckInterval; }
    public void setHealthCheckInterval(int healthCheckInterval) { this.healthCheckInterval = healthCheckInterval; }
}
@TuskConfig
public class DistributedCacheConfig {
    private String type;
    private List<String> nodes;
    private String clusterName;
    private int replicationFactor;
    private String partitionStrategy;
    private EvictionConfig eviction;
    
    // Getters and setters
    public String getType() { return type; }
    public void setType(String type) { this.type = type; }
    
    public List<String> getNodes() { return nodes; }
    public void setNodes(List<String> nodes) { this.nodes = nodes; }
    
    public String getClusterName() { return clusterName; }
    public void setClusterName(String clusterName) { this.clusterName = clusterName; }
    
    public int getReplicationFactor() { return replicationFactor; }
    public void setReplicationFactor(int replicationFactor) { this.replicationFactor = replicationFactor; }
    
    public String getPartitionStrategy() { return partitionStrategy; }
    public void setPartitionStrategy(String partitionStrategy) { this.partitionStrategy = partitionStrategy; }
    
    public EvictionConfig getEviction() { return eviction; }
    public void setEviction(EvictionConfig eviction) { this.eviction = eviction; }
}
@TuskConfig
public class EvictionConfig {
    private String policy;
    private int maxSize;
    private long ttl;
    private boolean lruEnabled;
    
    // Getters and setters
    public String getPolicy() { return policy; }
    public void setPolicy(String policy) { this.policy = policy; }
    
    public int getMaxSize() { return maxSize; }
    public void setMaxSize(int maxSize) { this.maxSize = maxSize; }
    
    public long getTtl() { return ttl; }
    public void setTtl(long ttl) { this.ttl = ttl; }
    
    public boolean isLruEnabled() { return lruEnabled; }
    public void setLruEnabled(boolean lruEnabled) { this.lruEnabled = lruEnabled; }
}
@TuskConfig
public class MessageQueueConfig {
    private String broker;
    private List<String> brokers;
    private String topic;
    private String groupId;
    private int partitions;
    private int replicationFactor;
    private RetentionConfig retention;
    
    // Getters and setters
    public String getBroker() { return broker; }
    public void setBroker(String broker) { this.broker = broker; }
    
    public List<String> getBrokers() { return brokers; }
    public void setBrokers(List<String> brokers) { this.brokers = brokers; }
    
    public String getTopic() { return topic; }
    public void setTopic(String topic) { this.topic = topic; }
    
    public String getGroupId() { return groupId; }
    public void setGroupId(String groupId) { this.groupId = groupId; }
    
    public int getPartitions() { return partitions; }
    public void setPartitions(int partitions) { this.partitions = partitions; }
    
    public int getReplicationFactor() { return replicationFactor; }
    public void setReplicationFactor(int replicationFactor) { this.replicationFactor = replicationFactor; }
    
    public RetentionConfig getRetention() { return retention; }
    public void setRetention(RetentionConfig retention) { this.retention = retention; }
}
@TuskConfig
public class RetentionConfig {
    private long timeMs;
    private long sizeBytes;
    private String cleanupPolicy;
    
    // Getters and setters
    public long getTimeMs() { return timeMs; }
    public void setTimeMs(long timeMs) { this.timeMs = timeMs; }
    
    public long getSizeBytes() { return sizeBytes; }
    public void setSizeBytes(long sizeBytes) { this.sizeBytes = sizeBytes; }
    
    public String getCleanupPolicy() { return cleanupPolicy; }
    public void setCleanupPolicy(String cleanupPolicy) { this.cleanupPolicy = cleanupPolicy; }
}

🏗️ Distributed TuskLang Configuration

distributed-service.tsk

Distributed Service Configuration
[service]
name: "user-service"
version: "2.1.0"
environment: @env("ENVIRONMENT", "production")
[service_mesh]
istio_url: @env("ISTIO_URL", "http://istiod:15010")
namespace: @env("NAMESPACE", "user-services")
service_account: "user-service-account"
labels {
    app: "user-service"
    version: "2.1.0"
    team: "identity"
}
[traffic]
routing_strategy: "weighted"
weight_distribution {
    v1: 0.8
    v2: 0.2
}
[retry]
max_attempts: 3
initial_delay: 1000
max_delay: 10000
multiplier: 2.0
retryable_exceptions: [
    "java.net.SocketTimeoutException",
    "java.net.ConnectException",
    "org.springframework.web.client.ResourceAccessException"
]
[timeout]
connection_timeout: 5000
read_timeout: 10000
write_timeout: 10000
idle_timeout: 30000
[load_balancer]
algorithm: "round_robin"
max_connections: 1000
health_check_enabled: true
health_check_path: "/health"
health_check_interval: 30
[circuit_breaker]
failure_threshold: 5
recovery_timeout: 60000
expected_response_time: 2000
enabled: true
[distributed_cache]
type: "hazelcast"
nodes: [
    "cache-node-1:5701",
    "cache-node-2:5701",
    "cache-node-3:5701"
]
cluster_name: "user-service-cache"
replication_factor: 2
partition_strategy: "consistent_hash"
[eviction]
policy: "lru"
max_size: 10000
ttl: 3600000
lru_enabled: true
[message_queue]
broker: "kafka"
brokers: [
    "kafka-1:9092",
    "kafka-2:9092",
    "kafka-3:9092"
]
topic: "user-events"
group_id: "user-service-group"
partitions: 6
replication_factor: 3
[retention]
time_ms: 604800000
size_bytes: 1073741824
cleanup_policy: "delete"
Dynamic distributed configuration
[monitoring]
active_connections: @query("SELECT COUNT(*) FROM connections WHERE status = 'active'")
cache_hit_rate: @metrics("cache_hit_rate_percent", 85)
message_lag: @metrics("kafka_consumer_lag", 0)
service_health: @http("GET", "http://health-check/user-service")
cluster_size: @query("SELECT COUNT(*) FROM cluster_members WHERE status = 'active'")

🔄 Service Discovery and Registration

Service Registry Configuration

import org.tusklang.java.TuskLang;
import org.tusklang.java.config.TuskConfig;
@TuskConfig
public class ServiceRegistryConfig {
    private String registryType;
    private String registryUrl;
    private String serviceName;
    private String serviceId;
    private int port;
    private String healthCheckUrl;
    private Map<String, String> metadata;
    private HeartbeatConfig heartbeat;
    
    // Getters and setters
    public String getRegistryType() { return registryType; }
    public void setRegistryType(String registryType) { this.registryType = registryType; }
    
    public String getRegistryUrl() { return registryUrl; }
    public void setRegistryUrl(String registryUrl) { this.registryUrl = registryUrl; }
    
    public String getServiceName() { return serviceName; }
    public void setServiceName(String serviceName) { this.serviceName = serviceName; }
    
    public String getServiceId() { return serviceId; }
    public void setServiceId(String serviceId) { this.serviceId = serviceId; }
    
    public int getPort() { return port; }
    public void setPort(int port) { this.port = port; }
    
    public String getHealthCheckUrl() { return healthCheckUrl; }
    public void setHealthCheckUrl(String healthCheckUrl) { this.healthCheckUrl = healthCheckUrl; }
    
    public Map<String, String> getMetadata() { return metadata; }
    public void setMetadata(Map<String, String> metadata) { this.metadata = metadata; }
    
    public HeartbeatConfig getHeartbeat() { return heartbeat; }
    public void setHeartbeat(HeartbeatConfig heartbeat) { this.heartbeat = heartbeat; }
}
@TuskConfig
public class HeartbeatConfig {
    private int interval;
    private int timeout;
    private boolean enabled;
    private String path;
    
    // Getters and setters
    public int getInterval() { return interval; }
    public void setInterval(int interval) { this.interval = interval; }
    
    public int getTimeout() { return timeout; }
    public void setTimeout(int timeout) { this.timeout = timeout; }
    
    public boolean isEnabled() { return enabled; }
    public void setEnabled(boolean enabled) { this.enabled = enabled; }
    
    public String getPath() { return path; }
    public void setPath(String path) { this.path = path; }
}

service-registry.tsk

[registry]
type: "consul"
url: @env("CONSUL_URL", "http://consul:8500")
service_name: "user-service"
service_id: @env("HOSTNAME", "user-service-1")
port: 8080
health_check_url: "http://localhost:8080/health"
[metadata]
version: "2.1.0"
environment: @env("ENVIRONMENT", "production")
team: "identity"
data_center: @env("DATACENTER", "us-east-1")
instance_type: @env("INSTANCE_TYPE", "t3.medium")
[heartbeat]
interval: 30
timeout: 10
enabled: true
path: "/heartbeat"
Service discovery monitoring
[monitoring]
registered_services: @query("SELECT COUNT(*) FROM services WHERE status = 'passing'")
service_instances: @query("SELECT COUNT(*) FROM service_instances WHERE healthy = true")
registry_health: @http("GET", "http://consul:8500/v1/status/leader")

🔗 Inter-Service Communication

API Gateway Configuration

import org.tusklang.java.TuskLang;
import org.tusklang.java.config.TuskConfig;
@TuskConfig
public class ApiGatewayConfig {
    private String gatewayUrl;
    private String serviceName;
    private RouteConfig routes;
    private RateLimitConfig rateLimit;
    private AuthConfig auth;
    private CorsConfig cors;
    
    // Getters and setters
    public String getGatewayUrl() { return gatewayUrl; }
    public void setGatewayUrl(String gatewayUrl) { this.gatewayUrl = gatewayUrl; }
    
    public String getServiceName() { return serviceName; }
    public void setServiceName(String serviceName) { this.serviceName = serviceName; }
    
    public RouteConfig getRoutes() { return routes; }
    public void setRoutes(RouteConfig routes) { this.routes = routes; }
    
    public RateLimitConfig getRateLimit() { return rateLimit; }
    public void setRateLimit(RateLimitConfig rateLimit) { this.rateLimit = rateLimit; }
    
    public AuthConfig getAuth() { return auth; }
    public void setAuth(AuthConfig auth) { this.auth = auth; }
    
    public CorsConfig getCors() { return cors; }
    public void setCors(CorsConfig cors) { this.cors = cors; }
}
@TuskConfig
public class RouteConfig {
    private String path;
    private String serviceId;
    private String method;
    private int timeout;
    private boolean stripPrefix;
    private Map<String, String> headers;
    
    // Getters and setters
    public String getPath() { return path; }
    public void setPath(String path) { this.path = path; }
    
    public String getServiceId() { return serviceId; }
    public void setServiceId(String serviceId) { this.serviceId = serviceId; }
    
    public String getMethod() { return method; }
    public void setMethod(String method) { this.method = method; }
    
    public int getTimeout() { return timeout; }
    public void setTimeout(int timeout) { this.timeout = timeout; }
    
    public boolean isStripPrefix() { return stripPrefix; }
    public void setStripPrefix(boolean stripPrefix) { this.stripPrefix = stripPrefix; }
    
    public Map<String, String> getHeaders() { return headers; }
    public void setHeaders(Map<String, String> headers) { this.headers = headers; }
}
@TuskConfig
public class AuthConfig {
    private boolean enabled;
    private String type;
    private String secret;
    private String issuer;
    private List<String> requiredScopes;
    
    // Getters and setters
    public boolean isEnabled() { return enabled; }
    public void setEnabled(boolean enabled) { this.enabled = enabled; }
    
    public String getType() { return type; }
    public void setType(String type) { this.type = type; }
    
    public String getSecret() { return secret; }
    public void setSecret(String secret) { this.secret = secret; }
    
    public String getIssuer() { return issuer; }
    public void setIssuer(String issuer) { this.issuer = issuer; }
    
    public List<String> getRequiredScopes() { return requiredScopes; }
    public void setRequiredScopes(List<String> requiredScopes) { this.requiredScopes = requiredScopes; }
}
@TuskConfig
public class CorsConfig {
    private boolean enabled;
    private List<String> allowedOrigins;
    private List<String> allowedMethods;
    private List<String> allowedHeaders;
    private boolean allowCredentials;
    
    // Getters and setters
    public boolean isEnabled() { return enabled; }
    public void setEnabled(boolean enabled) { this.enabled = enabled; }
    
    public List<String> getAllowedOrigins() { return allowedOrigins; }
    public void setAllowedOrigins(List<String> allowedOrigins) { this.allowedOrigins = allowedOrigins; }
    
    public List<String> getAllowedMethods() { return allowedMethods; }
    public void setAllowedMethods(List<String> allowedMethods) { this.allowedMethods = allowedMethods; }
    
    public List<String> getAllowedHeaders() { return allowedHeaders; }
    public void setAllowedHeaders(List<String> allowedHeaders) { this.allowedHeaders = allowedHeaders; }
    
    public boolean isAllowCredentials() { return allowCredentials; }
    public void setAllowCredentials(boolean allowCredentials) { this.allowCredentials = allowCredentials; }
}

api-gateway.tsk

[gateway]
url: @env("GATEWAY_URL", "http://gateway:8080")
service_name: "user-service"
[routes]
user_api {
    path: "/api/users"
    service_id: "user-service"
    method: "GET"
    timeout: 10000
    strip_prefix: false
    headers {
        "X-Service-Version": "2.1.0"
        "X-Request-ID": @env("REQUEST_ID")
    }
}
user_management {
    path: "/api/users/*"
    service_id: "user-service"
    method: "POST,PUT,DELETE"
    timeout: 15000
    strip_prefix: false
}
[rate_limit]
enabled: true
requests_per_minute: 1000
burst_limit: 100
[auth]
enabled: true
type: "jwt"
secret: @env.secure("JWT_SECRET")
issuer: "api-gateway"
required_scopes: [
    "read:users",
    "write:users"
]
[cors]
enabled: true
allowed_origins: [
    "https://app.example.com",
    "https://admin.example.com"
]
allowed_methods: ["GET", "POST", "PUT", "DELETE", "OPTIONS"]
allowed_headers: ["Content-Type", "Authorization", "X-Request-ID"]
allow_credentials: true
Gateway monitoring
[monitoring]
active_routes: @query("SELECT COUNT(*) FROM routes WHERE status = 'active'")
request_count: @metrics("gateway_requests_total", 0)
response_time: @metrics("gateway_response_time_ms", 0)
error_rate: @metrics("gateway_error_rate_percent", 0)

📊 Distributed Data Management

Distributed Database Configuration

import org.tusklang.java.TuskLang;
import org.tusklang.java.config.TuskConfig;
@TuskConfig
public class DistributedDatabaseConfig {
    private String type;
    private List<String> nodes;
    private String clusterName;
    private ReplicationConfig replication;
    private ShardingConfig sharding;
    private ConsistencyConfig consistency;
    
    // Getters and setters
    public String getType() { return type; }
    public void setType(String type) { this.type = type; }
    
    public List<String> getNodes() { return nodes; }
    public void setNodes(List<String> nodes) { this.nodes = nodes; }
    
    public String getClusterName() { return clusterName; }
    public void setClusterName(String clusterName) { this.clusterName = clusterName; }
    
    public ReplicationConfig getReplication() { return replication; }
    public void setReplication(ReplicationConfig replication) { this.replication = replication; }
    
    public ShardingConfig getSharding() { return sharding; }
    public void setSharding(ShardingConfig sharding) { this.sharding = sharding; }
    
    public ConsistencyConfig getConsistency() { return consistency; }
    public void setConsistency(ConsistencyConfig consistency) { this.consistency = consistency; }
}
@TuskConfig
public class ReplicationConfig {
    private String strategy;
    private int factor;
    private boolean syncReplication;
    private String quorum;
    
    // Getters and setters
    public String getStrategy() { return strategy; }
    public void setStrategy(String strategy) { this.strategy = strategy; }
    
    public int getFactor() { return factor; }
    public void setFactor(int factor) { this.factor = factor; }
    
    public boolean isSyncReplication() { return syncReplication; }
    public void setSyncReplication(boolean syncReplication) { this.syncReplication = syncReplication; }
    
    public String getQuorum() { return quorum; }
    public void setQuorum(String quorum) { this.quorum = quorum; }
}
@TuskConfig
public class ShardingConfig {
    private String strategy;
    private String shardKey;
    private int numberOfShards;
    private Map<String, String> shardMapping;
    
    // Getters and setters
    public String getStrategy() { return strategy; }
    public void setStrategy(String strategy) { this.strategy = strategy; }
    
    public String getShardKey() { return shardKey; }
    public void setShardKey(String shardKey) { this.shardKey = shardKey; }
    
    public int getNumberOfShards() { return numberOfShards; }
    public void setNumberOfShards(int numberOfShards) { this.numberOfShards = numberOfShards; }
    
    public Map<String, String> getShardMapping() { return shardMapping; }
    public void setShardMapping(Map<String, String> shardMapping) { this.shardMapping = shardMapping; }
}
@TuskConfig
public class ConsistencyConfig {
    private String level;
    private boolean readFromReplicas;
    private String writeConcern;
    private String readPreference;
    
    // Getters and setters
    public String getLevel() { return level; }
    public void setLevel(String level) { this.level = level; }
    
    public boolean isReadFromReplicas() { return readFromReplicas; }
    public void setReadFromReplicas(boolean readFromReplicas) { this.readFromReplicas = readFromReplicas; }
    
    public String getWriteConcern() { return writeConcern; }
    public void setWriteConcern(String writeConcern) { this.writeConcern = writeConcern; }
    
    public String getReadPreference() { return readPreference; }
    public void setReadPreference(String readPreference) { this.readPreference = readPreference; }
}

distributed-database.tsk

[database]
type: "mongodb"
nodes: [
    "mongo-1:27017",
    "mongo-2:27017",
    "mongo-3:27017"
]
cluster_name: "user-service-cluster"
[replication]
strategy: "replica_set"
factor: 3
sync_replication: true
quorum: "majority"
[sharding]
strategy: "hash"
shard_key: "user_id"
number_of_shards: 6
shard_mapping {
    "shard-0": "mongo-shard-1:27017"
    "shard-1": "mongo-shard-2:27017"
    "shard-2": "mongo-shard-3:27017"
}
[consistency]
level: "eventual"
read_from_replicas: true
write_concern: "majority"
read_preference: "nearest"
Distributed database monitoring
[monitoring]
cluster_health: @query("SELECT status FROM cluster_health WHERE cluster_name = 'user-service-cluster'")
replication_lag: @metrics("replication_lag_ms", 0)
shard_distribution: @query("SELECT shard_name, COUNT(*) FROM users GROUP BY shard_name")
consistency_level: @metrics("consistency_level_percent", 99.9)

🔄 Event Sourcing and CQRS

Event Store Configuration

import org.tusklang.java.TuskLang;
import org.tusklang.java.config.TuskConfig;
@TuskConfig
public class EventStoreConfig {
    private String type;
    private String connectionString;
    private String database;
    private String collection;
    private SnapshotConfig snapshot;
    private ProjectionConfig projection;
    
    // Getters and setters
    public String getType() { return type; }
    public void setType(String type) { this.type = type; }
    
    public String getConnectionString() { return connectionString; }
    public void setConnectionString(String connectionString) { this.connectionString = connectionString; }
    
    public String getDatabase() { return database; }
    public void setDatabase(String database) { this.database = database; }
    
    public String getCollection() { return collection; }
    public void setCollection(String collection) { this.collection = collection; }
    
    public SnapshotConfig getSnapshot() { return snapshot; }
    public void setSnapshot(SnapshotConfig snapshot) { this.snapshot = snapshot; }
    
    public ProjectionConfig getProjection() { return projection; }
    public void setProjection(ProjectionConfig projection) { this.projection = projection; }
}
@TuskConfig
public class SnapshotConfig {
    private boolean enabled;
    private int interval;
    private String storage;
    private CompressionConfig compression;
    
    // Getters and setters
    public boolean isEnabled() { return enabled; }
    public void setEnabled(boolean enabled) { this.enabled = enabled; }
    
    public int getInterval() { return interval; }
    public void setInterval(int interval) { this.interval = interval; }
    
    public String getStorage() { return storage; }
    public void setStorage(String storage) { this.storage = storage; }
    
    public CompressionConfig getCompression() { return compression; }
    public void setCompression(CompressionConfig compression) { this.compression = compression; }
}
@TuskConfig
public class CompressionConfig {
    private boolean enabled;
    private String algorithm;
    private int level;
    
    // Getters and setters
    public boolean isEnabled() { return enabled; }
    public void setEnabled(boolean enabled) { this.enabled = enabled; }
    
    public String getAlgorithm() { return algorithm; }
    public void setAlgorithm(String algorithm) { this.algorithm = algorithm; }
    
    public int getLevel() { return level; }
    public void setLevel(int level) { this.level = level; }
}
@TuskConfig
public class ProjectionConfig {
    private boolean enabled;
    private String type;
    private String database;
    private String collection;
    private Map<String, String> handlers;
    
    // Getters and setters
    public boolean isEnabled() { return enabled; }
    public void setEnabled(boolean enabled) { this.enabled = enabled; }
    
    public String getType() { return type; }
    public void setType(String type) { this.type = type; }
    
    public String getDatabase() { return database; }
    public void setDatabase(String database) { this.database = database; }
    
    public String getCollection() { return collection; }
    public void setCollection(String collection) { this.collection = collection; }
    
    public Map<String, String> getHandlers() { return handlers; }
    public void setHandlers(Map<String, String> handlers) { this.handlers = handlers; }
}

event-store.tsk

[event_store]
type: "mongodb"
connection_string: @env("EVENT_STORE_CONNECTION", "mongodb://eventstore:27017")
database: "eventstore"
collection: "events"
[snapshot]
enabled: true
interval: 1000
storage: "mongodb"
[compression]
enabled: true
algorithm: "gzip"
level: 6
[projection]
enabled: true
type: "mongodb"
database: "projections"
collection: "user_projections"
handlers {
    "UserCreated": "com.example.projections.UserCreatedHandler"
    "UserUpdated": "com.example.projections.UserUpdatedHandler"
    "UserDeleted": "com.example.projections.UserDeletedHandler"
}
Event sourcing monitoring
[monitoring]
event_count: @query("SELECT COUNT(*) FROM events WHERE aggregate_type = 'User'")
snapshot_count: @query("SELECT COUNT(*) FROM snapshots WHERE aggregate_type = 'User'")
projection_lag: @metrics("projection_lag_events", 0)
event_size_avg: @metrics("event_size_bytes", 0)

🎯 Best Practices

1. Service Discovery

- Use consistent naming conventions - Implement health checks - Configure proper timeouts - Use metadata for service identification

2. Load Balancing

- Choose appropriate algorithms - Monitor backend health - Implement circuit breakers - Use connection pooling

3. Distributed Caching

- Use consistent hashing - Implement cache invalidation - Monitor cache hit rates - Configure proper TTL

4. Message Queues

- Use appropriate partitioning - Configure replication - Implement dead letter queues - Monitor consumer lag

5. Event Sourcing

- Use snapshots for performance - Implement proper projections - Handle event versioning - Monitor event store performance

🔧 Troubleshooting

Common Issues

1. Service Discovery Failures - Check registry connectivity - Verify service registration - Review health check configuration - Check network connectivity

2. Load Balancing Issues - Monitor backend health - Check connection limits - Review timeout settings - Verify load balancer configuration

3. Cache Inconsistencies - Check replication status - Monitor network latency - Review eviction policies - Verify cluster membership

4. Message Queue Problems - Monitor consumer lag - Check partition distribution - Review retention policies - Verify broker connectivity

Debug Commands

Check service discovery
curl -X GET http://consul:8500/v1/catalog/services
Test load balancer
curl -X GET http://loadbalancer/health
Check cache cluster
java -jar cache-admin.jar --cluster-status
Monitor message queue
kafka-consumer-groups.sh --bootstrap-server kafka:9092 --describe --group user-service-group

🚀 Next Steps

1. Implement service mesh for traffic management 2. Set up distributed caching for performance 3. Configure message queues for async communication 4. Implement event sourcing for data consistency 5. Monitor distributed systems for reliability

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