lib/foundation/process_manager.ex

defmodule Foundation.ProcessManager do @moduledoc """ Intelligent process distribution and management. """

use GenServer require Logger

defstruct [:config, :distribution_strategy, :health_monitor]

def start_link(config) do GenServer.start_link(MODULE, config, name: MODULE) end

@impl true def init(config) do state = %MODULE{ config: config, distribution_strategy: config[:distribution] || :local, health_monitor: %{} }

{:ok, state}

end

@doc """ Start a distributed process with intelligent placement. """ def start_distributed_process(module, args, opts \ []) do GenServer.call(MODULE, {:start_process, module, args, opts}) end

@doc """ Start a process group with specified distribution strategy. """ def start_process_group(module, opts \ []) do count = Keyword.get(opts, :count, 1) strategy = Keyword.get(opts, :strategy, :distributed)

case strategy do
  :distributed ->
    start_distributed_group(module, count, opts)
  
  :local ->
    start_local_group(module, count, opts)
  
  :replicated ->
    start_replicated_group(module, opts)
end

end

@impl true def handle_call({:start_process, module, args, opts}, _from, state) do strategy = determine_distribution_strategy(module, opts, state)

result = case strategy do
  :singleton ->
    start_singleton_process(module, args, opts, state)
  
  :replicated ->
    start_replicated_process(module, args, opts, state)
  
  :partitioned ->
    start_partitioned_process(module, args, opts, state)
  
  :local ->
    start_local_process(module, args, opts, state)
end

{:reply, result, state}

end

Distribution strategy determination

defp determine_distribution_strategy(module, opts, state) do cond do Keyword.get(opts, :strategy) -> Keyword.get(opts, :strategy)

  state.distribution_strategy == :local ->
    :local
  
  singleton_process?(module) ->
    :singleton
  
  replicated_process?(module) ->
    :replicated
  
  true ->
    :partitioned
end

end

Singleton process management

defp start_singleton_process(module, args, opts, state) do name = Keyword.get(opts, :name, module)

case state.distribution_strategy do
  :horde ->
    start_horde_singleton(module, args, name, opts)
  
  :local ->
    start_local_singleton(module, args, name, opts)
end

end

defp start_horde_singleton(module, args, name, opts) do child_spec = %{ id: name, start: {module, :start_link, [args]}, restart: Keyword.get(opts, :restart, :permanent) }

case Horde.DynamicSupervisor.start_child(Foundation.DistributedSupervisor, child_spec) do
  {:ok, pid} ->
    # Register in Horde.Registry for global discovery
    case Horde.Registry.register(Foundation.ProcessRegistry, name, pid) do
      {:ok, _} -> 
        {:ok, pid}
      {:error, reason} -> 
        Logger.warning("Failed to register process #{name}: #{reason}")
        {:ok, pid}  # Still return success as process started
    end
  
  {:error, {:already_started, pid}} ->
    {:ok, pid}
  
  error ->
    error
end

end

defp start_local_singleton(module, args, name, opts) do child_spec = %{ id: name, start: {module, :start_link, [args]}, restart: Keyword.get(opts, :restart, :permanent) }

case DynamicSupervisor.start_child(Foundation.DistributedSupervisor, child_spec) do
  {:ok, pid} ->
    Registry.register(Foundation.ProcessRegistry, name, pid)
    {:ok, pid}
  
  error ->
    error
end

end

Helper functions

defp singleton_process?(module) do # Check if module defines itself as singleton function_exported?(module, :foundation_singleton, 0) and module.foundation_singleton() end

defp replicated_process?(module) do # Check if module defines itself as replicated function_exported?(module, :foundation_replicated, 0) and module.foundation_replicated() end

defp start_distributed_group(module, count, opts) do cluster_size = Foundation.Cluster.size() per_node = max(1, div(count, cluster_size))

tasks = for _i <- 1..per_node do
  Task.async(fn ->
    start_distributed_process(module, [], opts)
  end)
end

Task.await_many(tasks)

end

defp start_local_group(module, count, opts) do for _i <- 1..count do start_distributed_process(module, [], Keyword.put(opts, :strategy, :local)) end end

defp start_replicated_group(module, opts) do # Start one instance per node Foundation.Cluster.broadcast_to_all_nodes(fn -> start_distributed_process(module, [], Keyword.put(opts, :strategy, :local)) end) end

defp start_replicated_process(_module, _args, _opts, _state) do # Implementation for replicated processes {:error, :not_implemented} end

defp start_partitioned_process(_module, _args, _opts, _state) do # Implementation for partitioned processes
{:error, :not_implemented} end

defp start_local_process(module, args, opts, _state) do name = Keyword.get(opts, :name)

child_spec = if name do
  %{
    id: name,
    start: {module, :start_link, [args]},
    restart: Keyword.get(opts, :restart, :permanent)
  }
else
  %{
    id: module,
    start: {module, :start_link, [args]},
    restart: Keyword.get(opts, :restart, :permanent)
  }
end

DynamicSupervisor.start_child(Foundation.DistributedSupervisor, child_spec)

end end

==============================================================================

STEP 7: Service Mesh & Discovery

==============================================================================

lib/foundation/service_mesh.ex

defmodule Foundation.ServiceMesh do @moduledoc """ Service discovery and mesh capabilities. """

use GenServer require Logger

defstruct [:services, :health_checks, :load_balancer]

def start_link(_opts) do GenServer.start_link(MODULE, %{}, name: MODULE) end

@impl true def init(_opts) do state = %MODULE{ services: %{}, health_checks: %{}, load_balancer: Foundation.LoadBalancer.new() }

# Start periodic health checking
schedule_health_checks()

{:ok, state}

end

@doc """ Register a service in the mesh. """ def register_service(name, pid, capabilities \ []) do GenServer.call(MODULE, {:register_service, name, pid, capabilities}) end

@doc """ Discover services matching criteria. """ def discover_services(criteria) do GenServer.call(MODULE, {:discover_services, criteria}) end

@doc """ Get all instances of a specific service. """ def discover_service_instances(service_name) do GenServer.call(MODULE, {:discover_service_instances, service_name}) end

@impl true def handle_call({:register_service, name, pid, capabilities}, _from, state) do service = %{ name: name, pid: pid, node: Node.self(), capabilities: capabilities, registered_at: System.system_time(:second), health_status: :healthy }

# Multi-layer registration
registrations = [
  register_locally(service, state),
  register_in_process_registry(service),
  announce_via_pubsub(service)
]

case Enum.all?(registrations, &match?(:ok, &1)) do
  true ->
    new_services = Map.put(state.services, {name, pid}, service)
    new_state = %{state | services: new_services}
    {:reply, {:ok, :registered}, new_state}
  
  false ->
    {:reply, {:error, :partial_registration}, state}
end

end

@impl true def handle_call({:discover_services, criteria}, _from, state) do matching_services = state.services |> Enum.filter(fn {_key, service} -> matches_criteria?(service, criteria) end) |> Enum.map(fn {_key, service} -> service end)

{:reply, matching_services, state}

end

@impl true def handle_call({:discover_service_instances, service_name}, _from, state) do instances = state.services |> Enum.filter(fn {_key, service} -> service.name == service_name end) |> Enum.map(fn {_key, service} -> service end) |> Enum.filter(fn service -> service.health_status == :healthy end)

{:reply, instances, state}

end

@impl true def handle_info(:health_check, state) do new_state = perform_health_checks(state) schedule_health_checks() {:noreply, new_state} end

Registration helpers

defp register_locally(service, _state) do # Register in local ETS table for fast lookup :ets.insert_new(:foundation_services, {{service.name, service.pid}, service}) :ok rescue _ -> :error end

defp register_in_process_registry(service) do # Register in Foundation.ProcessRegistry (Horde or local Registry) case Registry.register(Foundation.ProcessRegistry, {:service, service.name}, service.pid) do {:ok, _} -> :ok {:error, _} -> :error end end

defp announce_via_pubsub(service) do # Announce service registration via Phoenix.PubSub Foundation.Messaging.broadcast( “foundation:services”, {:service_registered, service} ) :ok rescue _ -> :error end

Discovery helpers

defp matches_criteria?(service, criteria) do Enum.all?(criteria, fn {key, value} -> case key do :name -> service.name == value :node -> service.node == value :capabilities -> required_caps = List.wrap(value) Enum.all?(required_caps, &(&1 in service.capabilities)) :health_status -> service.health_status == value _ -> true end end) end

Health monitoring

defp schedule_health_checks() do Process.send_after(self(), :health_check, 30_000) # Every 30 seconds end

defp perform_health_checks(state) do new_services = Enum.into(state.services, %{}, fn {key, service} -> health_status = check_service_health(service) updated_service = %{service | health_status: health_status} {key, updated_service} end)

%{state | services: new_services}

end

defp check_service_health(service) do case Process.alive?(service.pid) do true -> :healthy false -> :unhealthy end end end

==============================================================================

STEP 8: Health Monitoring & Performance Optimization

==============================================================================

lib/foundation/health_monitor.ex

defmodule Foundation.HealthMonitor do @moduledoc """ Cluster health monitoring and reporting. """

use GenServer require Logger

def start_link(_opts) do GenServer.start_link(MODULE, %{}, name: MODULE) end

@impl true def init(_opts) do # Start periodic health monitoring schedule_health_check() {:ok, %{last_check: nil, health_history: []}} end

@doc """ Get current cluster health status. """ def cluster_health() do GenServer.call(MODULE, :get_health) end

@doc """ Get detailed health report. """ def detailed_health_report() do %{ cluster_status: check_cluster_status(), node_health: check_all_nodes(), service_health: check_service_health(), performance_metrics: collect_performance_metrics(), recommendations: generate_recommendations() } end

@impl true def handle_call(:get_health, _from, state) do health_report = detailed_health_report() {:reply, health_report, state} end

@impl true def handle_info(:health_check, state) do health_report = detailed_health_report()

# Log any concerning issues
if health_report.cluster_status.status != :healthy do
  Logger.warning("Cluster health issues detected: #{inspect(health_report)}")
end

# Schedule next check
schedule_health_check()

new_state = %{
  last_check: System.system_time(:second),
  health_history: [health_report | Enum.take(state.health_history, 9)]
}

{:noreply, new_state}

end

defp schedule_health_check() do Process.send_after(self(), :health_check, 60_000) # Every minute end

defp check_cluster_status() do connected_nodes = [Node.self() | Node.list()] expected_nodes = Application.get_env(:foundation, :expected_nodes, 1)

status = cond do
  length(connected_nodes) >= expected_nodes -> :healthy
  length(connected_nodes) >= div(expected_nodes, 2) -> :degraded
  true -> :critical
end

%{
  status: status,
  connected_nodes: length(connected_nodes),
  expected_nodes: expected_nodes,
  nodes: connected_nodes
}

end

defp check_all_nodes() do [Node.self() | Node.list()] |> Enum.map(&check_node_health/1) end

defp check_node_health(node) do case Node.ping(node) do :pong -> %{ node: node, status: :healthy, load: get_node_load(node), memory: get_node_memory(node) }

  :pang ->
    %{
      node: node,
      status: :unreachable,
      load: nil,
      memory: nil
    }
end

end

defp check_service_health() do Foundation.ServiceMesh.discover_services([]) |> Enum.group_by(& &1.health_status) |> Map.new(fn {status, services} -> {status, length(services)} end) end

defp collect_performance_metrics() do %{ message_throughput: measure_message_throughput(), average_latency: measure_average_latency(), error_rate: measure_error_rate(), memory_usage: :erlang.memory(:total), process_count: :erlang.system_info(:process_count) } end

defp generate_recommendations() do # Basic recommendations based on health status [] end

Utility functions for metrics collection

defp get_node_load(node) do case :rpc.call(node, :cpu_sup, :avg1, []) do {:badrpc, _} -> nil load -> load / 256 # Convert to percentage end rescue _ -> nil end

defp get_node_memory(node) do case :rpc.call(node, :erlang, :memory, [:total]) do {:badrpc, _} -> nil memory -> memory end rescue _ -> nil end

defp measure_message_throughput() do # Placeholder - would integrate with telemetry 0 end

defp measure_average_latency() do # Placeholder - would integrate with telemetry 0 end

defp measure_error_rate() do # Placeholder - would integrate with telemetry 0.0 end end

lib/foundation/performance_optimizer.ex

defmodule Foundation.PerformanceOptimizer do @moduledoc """ Automatic performance optimization based on cluster metrics. """

use GenServer require Logger

def start_link(_opts) do GenServer.start_link(MODULE, %{}, name: MODULE) end

@impl true def init(_opts) do schedule_optimization() {:ok, %{optimizations_applied: [], last_optimization: nil}} end

@doc """ Manually trigger performance optimization. """ def optimize_now() do GenServer.cast(MODULE, :optimize) end

@impl true def handle_cast(:optimize, state) do optimizations = analyze_and_recommend_optimizations() new_optimizations = apply_safe_optimizations(optimizations)

new_state = %{
  optimizations_applied: new_optimizations ++ state.optimizations_applied,
  last_optimization: System.system_time(:second)
}

{:noreply, new_state}

end

@impl true def handle_info(:scheduled_optimization, state) do handle_cast(:optimize, state) schedule_optimization() {:noreply, state} end

defp schedule_optimization() do Process.send_after(self(), :scheduled_optimization, 300_000) # Every 5 minutes end

defp analyze_and_recommend_optimizations() do cluster_metrics = Foundation.HealthMonitor.detailed_health_report()

optimizations = []

# Analyze Horde sync intervals
optimizations = maybe_optimize_horde_sync(cluster_metrics, optimizations)

# Analyze PubSub configuration
optimizations = maybe_optimize_pubsub(cluster_metrics, optimizations)

# Analyze process distribution
optimizations = maybe_optimize_process_distribution(cluster_metrics, optimizations)

optimizations

end

defp maybe_optimize_horde_sync(metrics, optimizations) do node_count = metrics.cluster_status.connected_nodes change_frequency = estimate_change_frequency(metrics)

optimal_interval = case {node_count, change_frequency} do
  {nodes, :high} when nodes < 10 -> 50
  {nodes, :high} when nodes < 50 -> 100
  {nodes, :medium} when nodes < 10 -> 100
  {nodes, :medium} when nodes < 50 -> 200
  {nodes, :low} -> 500
  _ -> 1000
end

current_interval = get_current_horde_sync_interval()

if current_interval != optimal_interval do
  optimization = %{
    type: :horde_sync_interval,
    current_value: current_interval,
    recommended_value: optimal_interval,
    reason: "Optimize for cluster size #{node_count} and change frequency #{change_frequency}"
  }
  [optimization | optimizations]
else
  optimizations
end

end

defp maybe_optimize_pubsub(metrics, optimizations) do # Analyze PubSub message patterns and suggest optimizations message_volume = metrics.performance_metrics.message_throughput

if message_volume > 1000 do
  optimization = %{
    type: :pubsub_compression,
    current_value: false,
    recommended_value: true,
    reason: "High message volume (#{message_volume}/sec) would benefit from compression"
  }
  [optimization | optimizations]
else
  optimizations
end

end

defp maybe_optimize_process_distribution(_metrics, optimizations) do # Analyze process distribution and suggest improvements optimizations end

defp apply_safe_optimizations(optimizations) do Enum.filter(optimizations, fn optimization -> case apply_optimization(optimization) do :ok -> Logger.info(“Applied optimization: #{optimization.type}”) true

    {:error, reason} ->
      Logger.warning("Failed to apply optimization #{optimization.type}: #{reason}")
      false
  end
end)

end

defp apply_optimization(%{type: :horde_sync_interval, recommended_value: interval}) do # This would require restarting Horde with new configuration # For now, just log the recommendation Logger.info(“Recommendation: Set Horde sync interval to #{interval}ms”) :ok end

defp apply_optimization(%{type: :pubsub_compression}) do # Enable compression for PubSub messages Logger.info(“Recommendation: Enable PubSub message compression”) :ok end

defp apply_optimization(_optimization) do {:error, :not_implemented} end

Helper functions

defp estimate_change_frequency(_metrics) do # Placeholder - would analyze actual change patterns :medium end

defp get_current_horde_sync_interval() do # Placeholder - would get actual configuration 100 end end

==============================================================================

STEP 9: Load Balancer & Utilities

==============================================================================

lib/foundation/load_balancer.ex

defmodule Foundation.LoadBalancer do @moduledoc """ Intelligent load balancing for service routing. """

defstruct [:strategy, :instance_weights, :health_status, :round_robin_index]

def new(strategy \ :round_robin) do %MODULE{ strategy: strategy, instance_weights: %{}, health_status: %{}, round_robin_index: 0 } end

def select_instance(instances, strategy \ :round_robin) do healthy_instances = Enum.filter(instances, &(&1.health_status == :healthy))

case {healthy_instances, strategy} do
  {[], _} ->
    nil
  
  {[instance], _} ->
    instance
  
  {instances, :round_robin} ->
    select_round_robin(instances)
  
  {instances, :least_connections} ->
    select_least_connections(instances)
  
  {instances, :random} ->
    Enum.random(instances)
  
  {instances, :least_latency} ->
    select_least_latency(instances)
end

end

defp select_round_robin(instances) do # Simple round-robin selection # In a real implementation, this would maintain state index = rem(:rand.uniform(1000), length(instances)) Enum.at(instances, index) end

defp select_least_connections(instances) do # Select instance with least connections # Placeholder - would track actual connections Enum.random(instances) end

defp select_least_latency(instances) do # Select instance with lowest latency # Placeholder - would track actual latencies Enum.random(instances) end end

lib/foundation/cluster.ex

defmodule Foundation.Cluster do @moduledoc """ Cluster information and utilities. """

@doc """ Get current cluster information. """ def cluster_info() do nodes = [Node.self() | Node.list()]

%{
  nodes: length(nodes),
  node_list: nodes,
  strategy: get_clustering_strategy(),
  health: get_cluster_health(),
  processes: count_distributed_processes(),
  services: count_registered_services()
}

end

@doc """ Get cluster size. """ def size() do length([Node.self() | Node.list()]) end

@doc """ Broadcast a function to all nodes. """ def broadcast_to_all_nodes(fun) do nodes = [Node.self() | Node.list()]

tasks = Enum.map(nodes, fn node ->
  Task.async(fn ->
    if node == Node.self() do
      fun.()
    else
      :rpc.call(node, fun, [])
    end
  end)
end)

Task.await_many(tasks)

end

@doc """ Get optimal worker count for current cluster. """ def optimal_worker_count() do cluster_size = size() cores_per_node = :erlang.system_info(:schedulers_online)

cluster_size * cores_per_node

end

Helper functions

defp get_clustering_strategy() do # Would get from configuration :auto_detected end

defp get_cluster_health() do case Foundation.HealthMonitor.cluster_health() do %{cluster_status: %{status: status}} -> status _ -> :unknown end end

defp count_distributed_processes() do # Count processes managed by Foundation case Process.whereis(Foundation.DistributedSupervisor) do nil -> 0 pid -> case Supervisor.count_children(pid) do %{active: count} -> count _ -> 0 end end end

defp count_registered_services() do Foundation.ServiceMesh.discover_services([]) |> length() end end

lib/foundation/topic_manager.ex

defmodule Foundation.TopicManager do @moduledoc """ Manages PubSub topics and subscriptions. """

use GenServer

def start_link(_opts) do GenServer.start_link(MODULE, %{}, name: MODULE) end

@impl true def init(_opts) do {:ok, %{subscriptions: %{}, topic_patterns: %{}}} end

def register_subscription(topic, handler) do GenServer.cast(MODULE, {:register, topic, handler}) end

@impl true def handle_cast({:register, topic, handler}, state) do subscriptions = Map.put(state.subscriptions, {topic, handler}, true) {:noreply, %{state | subscriptions: subscriptions}} end end

==============================================================================

STEP 10: Version & Utilities

==============================================================================

lib/foundation/version.ex

defmodule Foundation.Version do @moduledoc """ Foundation version information. """

def version(), do: “2.0.0”

def foundation_info() do %{ version: version(), profile: get_current_profile(), clustering_strategy: get_clustering_strategy(), distribution_mode: get_distribution_mode(), started_at: get_start_time() } end

defp get_current_profile() do case Process.whereis(Foundation.Configuration) do nil -> :unknown pid -> case GenServer.call(pid, :get_profile) do profile when is_atom(profile) -> profile _ -> :unknown end end rescue _ -> :unknown end

defp get_clustering_strategy() do # Would get actual strategy from cluster manager :auto_detected end

defp get_distribution_mode() do # Would get actual distribution mode :horde end

defp get_start_time() do # Would track actual start time System.system_time(:second) end end

Add version function to main Foundation module

defimpl String.Chars, for: Foundation do def to_string(_), do: “Foundation v#{Foundation.Version.version()}” end

Add to Foundation module

defmodule Foundation do

… existing code …

def version(), do: Foundation.Version.version() def info(), do: Foundation.Version.foundation_info() end

==============================================================================

STEP 11: Example Usage & Getting Started

==============================================================================

Example application showing Foundation 2.0 usage:

config/config.exs

config :foundation,

profile: :auto # Will auto-detect optimal configuration

lib/my_app/application.ex

defmodule MyApp.Application do

use Application

def start(_type, _args) do

children = [

# Foundation handles all the clustering complexity

{Foundation, []},

# Your services automatically become distributed

MyApp.UserService,

MyApp.OrderService,

MyApp.Web.Endpoint

]

Supervisor.start_link(children, strategy: :one_for_one)

end

end

lib/my_app/user_service.ex

defmodule MyApp.UserService do

use GenServer

def start_link(opts) do

# Foundation makes this a distributed singleton automatically

Foundation.ProcessManager.start_distributed_process(

MODULE,

opts,

strategy: :singleton,

name: :user_service

)

end

def get_user(user_id) do

# Foundation handles service discovery and routing

Foundation.Messaging.send_message(

{:service, :user_service},

{:get_user, user_id}

)

end

# Mark as singleton process

def foundation_singleton(), do: true

end

==============================================================================

GETTING STARTED COMMANDS

==============================================================================

1. Create new project:

mix new my_distributed_app –sup

cd my_distributed_app

2. Add Foundation to mix.exs:

{:foundation, “~> 2.0”}

3. Run:

mix deps.get

mix compile

4. Start multiple nodes for development:

iex –name dev1@localhost -S mix

iex –name dev2@localhost -S mix

# Foundation automatically discovers and connects them!

5. For production, just add one line to config:

config :foundation, cluster: :kubernetes

That’s it! You now have a distributed BEAM application with:

- Automatic service discovery

- Distributed process management

- Intelligent message routing

- Health monitoring

- Performance optimization

- Zero-config development clustering# Foundation 2.0: Day 1 Implementation Guide

Start building the ecosystem-driven distribution framework today!

==============================================================================

STEP 1: Project Setup

==============================================================================

mix.exs

defmodule Foundation.MixProject do use Mix.Project

def project do [ app: :foundation, version: “2.0.0”, elixir: “~> 1.15”, start_permanent: Mix.env() == :prod, deps: deps(), package: package(), description: “Ecosystem-driven distributed BEAM framework” ] end

def application do [ extra_applications: [:logger], mod: {Foundation.Application, []} ] end

defp deps do [ # Core clustering {:libcluster, “> 3.3”}, {:mdns_lite, “> 0.8”},

  # Process distribution
  {:horde, "~> 0.9"},
  
  # Messaging
  {:phoenix_pubsub, "~> 2.1"},
  
  # Caching (optional)
  {:nebulex, "~> 2.5", optional: true},
  
  # Observability
  {:telemetry, "~> 1.2"},
  {:telemetry_metrics, "~> 0.6"},
  
  # Advanced features (optional)
  {:partisan, "~> 5.0", optional: true},
  
  # Development
  {:credo, "~> 1.7", only: [:dev, :test]},
  {:dialyxir, "~> 1.4", only: [:dev, :test]},
  {:ex_doc, "~> 0.29", only: :dev},
  
  # Testing
  {:mox, "~> 1.0", only: :test},
  {:excoveralls, "~> 0.18", only: :test}
]

end

defp package do [ maintainers: [“Your Name”], licenses: [“MIT”], links: %{“GitHub” => “https://github.com/yourorg/foundation”} ] end end

==============================================================================

STEP 2: Application Structure

==============================================================================

lib/foundation.ex

defmodule Foundation do @moduledoc """ Foundation 2.0: Ecosystem-driven distributed BEAM framework

Provides zero-config development clustering and one-line production deployment by intelligently orchestrating best-in-class Elixir ecosystem tools.

Quick Start

  # Zero config development
  {:foundation, "~> 2.0"}
  
  # One line production  
  config :foundation, cluster: :kubernetes
  
  # Advanced configuration
  config :foundation, 
    profile: :enterprise,
    clusters: %{...}

"""

@doc """ Starts Foundation with intelligent configuration detection. """ def start_cluster(opts \ []) do config = Foundation.Configuration.resolve_configuration(opts) Foundation.Supervisor.start_cluster(config) end

@doc """ Sends a message intelligently across local/distributed boundaries. """ defdelegate send_message(target, message, opts \ []), to: Foundation.Messaging

@doc """ Starts a distributed process with intelligent placement. """ defdelegate start_process(module, args, opts \ []), to: Foundation.ProcessManager

@doc """ Gets current cluster information. """ defdelegate cluster_info(), to: Foundation.Cluster

@doc """ Registers a service in the service mesh. """ defdelegate register_service(name, pid, capabilities \ []), to: Foundation.ServiceMesh

@doc """ Discovers services matching criteria. """ defdelegate discover_services(criteria), to: Foundation.ServiceMesh end

lib/foundation/application.ex

defmodule Foundation.Application do use Application require Logger

@impl true def start(_type, _args) do Logger.info(“Starting Foundation 2.0…”)

# Detect optimal configuration
config = Foundation.Configuration.detect_and_resolve()
Logger.info("Foundation profile: #{config.profile}")

children = [
  # Core configuration
  {Foundation.Configuration, config},
  
  # Environment detection and optimization
  Foundation.EnvironmentDetector,
  
  # Clustering (strategy depends on environment)
  {Foundation.ClusterSupervisor, config.clustering},
  
  # Messaging (Phoenix.PubSub with intelligent config)
  {Foundation.PubSubSupervisor, config.messaging},
  
  # Process distribution (Horde or local depending on profile)
  {Foundation.ProcessSupervisor, config.processes},
  
  # Service mesh and discovery
  Foundation.ServiceMesh,
  
  # Health monitoring
  Foundation.HealthMonitor,
  
  # Performance optimization
  Foundation.PerformanceOptimizer
]

opts = [strategy: :one_for_one, name: Foundation.Supervisor]
Supervisor.start_link(children, opts)

end end

==============================================================================

STEP 3: Environment Detection & Configuration

==============================================================================

lib/foundation/environment_detector.ex

defmodule Foundation.EnvironmentDetector do @moduledoc """ Intelligent environment detection for optimal tool selection. """

use GenServer require Logger

def start_link(opts) do GenServer.start_link(MODULE, opts, name: MODULE) end

@impl true def init(_opts) do environment = detect_environment() infrastructure = detect_infrastructure() scale = detect_scale()

config = %{
  environment: environment,
  infrastructure: infrastructure,
  scale: scale,
  detected_at: System.system_time(:second)
}

Logger.info("Environment detected: #{inspect(config)}")
{:ok, config}

end

def get_detected_config() do GenServer.call(MODULE, :get_config) end

@impl true def handle_call(:get_config, _from, state) do {:reply, state, state} end

Environment detection logic

defp detect_environment() do cond do System.get_env(“MIX_ENV”) == “dev” -> :development kubernetes_environment?() -> :kubernetes docker_environment?() -> :containerized cloud_environment?() -> :cloud true -> :production end end

defp detect_infrastructure() do cond do kubernetes_available?() -> :kubernetes consul_available?() -> :consul
dns_srv_available?() -> :dns aws_environment?() -> :aws gcp_environment?() -> :gcp true -> :static end end

defp detect_scale() do expected_nodes = System.get_env(“FOUNDATION_EXPECTED_NODES”, “1”) |> String.to_integer()

cond do
  expected_nodes == 1 -> :single_node
  expected_nodes <= 10 -> :small_cluster
  expected_nodes <= 100 -> :medium_cluster  
  expected_nodes <= 1000 -> :large_cluster
  true -> :massive_cluster
end

end

Detection helpers

defp kubernetes_environment?() do System.get_env(“KUBERNETES_SERVICE_HOST”) != nil end

defp docker_environment?() do File.exists?("/.dockerenv") end

defp cloud_environment?() do aws_environment?() or gcp_environment?() or azure_environment?() end

defp kubernetes_available?() do kubernetes_environment?() and File.exists?("/var/run/secrets/kubernetes.io") end

defp consul_available?() do System.get_env(“CONSUL_HTTP_ADDR”) != nil end

defp dns_srv_available?() do # Check if DNS SRV records are configured System.get_env(“FOUNDATION_DNS_SRV”) != nil end

defp aws_environment?() do System.get_env(“AWS_REGION”) != nil end

defp gcp_environment?() do System.get_env(“GOOGLE_CLOUD_PROJECT”) != nil
end

defp azure_environment?() do System.get_env(“AZURE_SUBSCRIPTION_ID”) != nil end end

lib/foundation/configuration.ex

defmodule Foundation.Configuration do @moduledoc """ Smart configuration resolution based on environment detection. """

use GenServer

defstruct [ :profile, :clustering, :messaging, :processes, :caching, :features ]

def start_link(config) do GenServer.start_link(MODULE, config, name: MODULE) end

@impl true def init(config) do {:ok, config} end

def detect_and_resolve() do detected = Foundation.EnvironmentDetector.get_detected_config() user_config = Application.get_all_env(:foundation)

resolve_configuration(detected, user_config)

end

def resolve_configuration(detected \ nil, user_config \ []) do detected = detected || %{environment: :production, infrastructure: :static, scale: :small_cluster}

# Determine profile
profile = determine_profile(detected, user_config)

# Get base configuration for profile  
base_config = get_profile_config(profile)

# Override with user configuration
final_config = merge_user_config(base_config, user_config)

struct(__MODULE__, final_config)

end

defp determine_profile(detected, user_config) do case Keyword.get(user_config, :profile, :auto) do :auto -> auto_determine_profile(detected) explicit_profile -> explicit_profile end end

defp auto_determine_profile(%{environment: :development}), do: :development defp auto_determine_profile(%{scale: :single_node}), do: :development defp auto_determine_profile(%{scale: scale}) when scale in [:small_cluster, :medium_cluster], do: :production defp auto_determine_profile(%{scale: scale}) when scale in [:large_cluster, :massive_cluster], do: :enterprise defp auto_determine_profile(_), do: :production

defp get_profile_config(:development) do %{ profile: :development, clustering: %{ strategy: Foundation.Strategies.MdnsLite, config: [ service_name: “foundation-dev”, auto_connect: true, discovery_interval: 1000 ] }, messaging: %{ adapter: Phoenix.PubSub.PG2, name: Foundation.PubSub, local_only: true }, processes: %{ distribution: :local, supervisor: DynamicSupervisor, registry: Registry }, caching: %{ adapter: :ets, local_only: true }, features: [:hot_reload_coordination, :distributed_debugging, :development_dashboard] } end

defp get_profile_config(:production) do %{ profile: :production, clustering: %{ strategy: Foundation.ClusterManager.auto_detect_strategy(), config: Foundation.ClusterManager.auto_detect_config() }, messaging: %{ adapter: Phoenix.PubSub.PG2, name: Foundation.PubSub, compression: true }, processes: %{ distribution: :horde, supervisor: Horde.DynamicSupervisor, registry: Horde.Registry, sync_interval: 100 }, caching: %{ adapter: :nebulex_distributed, replication: :async }, features: [:health_monitoring, :performance_metrics, :automatic_scaling] } end

defp get_profile_config(:enterprise) do %{ profile: :enterprise, clustering: %{ multi_cluster: true, strategy: Foundation.ClusterManager.auto_detect_strategy(), federation: :enabled }, messaging: %{ adapter: Phoenix.PubSub.PG2, name: Foundation.PubSub, federated: true, compression: true }, processes: %{ distribution: :horde_multi_cluster, supervisor: Horde.DynamicSupervisor, registry: Horde.Registry, global_distribution: true }, caching: %{ adapter: :nebulex_federated, multi_tier: true }, features: [:multi_cluster_management, :advanced_observability, :disaster_recovery] } end

defp merge_user_config(base_config, user_config) do # Deep merge user configuration over base configuration Enum.reduce(user_config, base_config, fn {key, value}, acc -> case key do :cluster when is_atom(value) -> # Handle shorthand cluster configuration clustering_config = resolve_cluster_shorthand(value) Map.put(acc, :clustering, clustering_config)

    :clusters when is_map(value) ->
      # Handle multi-cluster configuration
      Map.put(acc, :clustering, Map.put(acc.clustering, :multi_cluster_config, value))
    
    _ ->
      Map.put(acc, key, value)
  end
end)

end

defp resolve_cluster_shorthand(:kubernetes) do %{ strategy: Cluster.Strategy.Kubernetes, config: [ mode: :hostname, kubernetes_node_basename: Application.get_env(:foundation, :node_basename, “foundation”), kubernetes_selector: Application.get_env(:foundation, :kubernetes_selector, “app=foundation”) ] } end

defp resolve_cluster_shorthand(:consul) do %{ strategy: Cluster.Strategy.Consul, config: [ service_name: Application.get_env(:foundation, :service_name, “foundation”) ] } end

defp resolve_cluster_shorthand(:dns) do %{ strategy: Cluster.Strategy.DNS, config: [ service: Application.get_env(:foundation, :dns_service, “foundation”), application_name: Application.get_env(:foundation, :application_name, “foundation”) ] } end

defp resolve_cluster_shorthand(:gossip) do %{ strategy: Cluster.Strategy.Gossip, config: [ multicast_addr: “230.1.1.251”, multicast_ttl: 1, secret: Application.get_env(:foundation, :gossip_secret, “foundation-secret”) ] } end end

==============================================================================

STEP 4: Clustering Management

==============================================================================

lib/foundation/cluster_supervisor.ex

defmodule Foundation.ClusterSupervisor do @moduledoc """ Manages clustering using libcluster with intelligent strategy selection. """

use Supervisor

def start_link(clustering_config) do Supervisor.start_link(MODULE, clustering_config, name: MODULE) end

@impl true def init(clustering_config) do children = case clustering_config do %{multi_cluster: true} -> # Multi-cluster setup setup_multi_cluster(clustering_config)

  %{strategy: strategy, config: config} ->
    # Single cluster setup
    setup_single_cluster(strategy, config)
  
  _ ->
    # No clustering (single node)
    []
end

Supervisor.init(children, strategy: :one_for_one)

end

defp setup_single_cluster(strategy, config) do topologies = [ foundation: [ strategy: strategy, config: config, connect: {:net_kernel, :connect_node, []}, disconnect: {:erlang, :disconnect_node, []}, list_nodes: {:erlang, :nodes, [:connected]} ] ]

[
  {Cluster.Supervisor, [topologies, [name: Foundation.ClusterManager]]},
  Foundation.ClusterHealth
]

end

defp setup_multi_cluster(clustering_config) do # Multi-cluster setup - more complex [ {Foundation.Federation, clustering_config}, Foundation.ClusterHealth ] end end

lib/foundation/cluster_manager.ex

defmodule Foundation.ClusterManager do @moduledoc """ Intelligent clustering strategy detection and management. """

def auto_detect_strategy() do cond do kubernetes_available?() -> Cluster.Strategy.Kubernetes consul_available?() -> Cluster.Strategy.Consul dns_srv_available?() -> Cluster.Strategy.DNS development_mode?() -> Foundation.Strategies.MdnsLite true -> Cluster.Strategy.Epmd end end

def auto_detect_config() do strategy = auto_detect_strategy()

case strategy do
  Cluster.Strategy.Kubernetes ->
    [
      mode: :hostname,
      kubernetes_node_basename: get_node_basename(),
      kubernetes_selector: get_kubernetes_selector()
    ]
  
  Cluster.Strategy.Consul ->
    [
      service_name: get_service_name()
    ]
  
  Cluster.Strategy.DNS ->
    [
      service: get_dns_service(),
      application_name: get_application_name()
    ]
  
  Foundation.Strategies.MdnsLite ->
    [
      service_name: "foundation-dev",
      auto_connect: true
    ]
  
  Cluster.Strategy.Epmd ->
    [
      hosts: get_static_hosts()
    ]
end

end

Helper functions for configuration detection

defp kubernetes_available?() do System.get_env(“KUBERNETES_SERVICE_HOST”) != nil and File.exists?("/var/run/secrets/kubernetes.io/serviceaccount/token") end

defp consul_available?() do System.get_env(“CONSUL_HTTP_ADDR”) != nil end

defp dns_srv_available?() do System.get_env(“FOUNDATION_DNS_SERVICE”) != nil end

defp development_mode?() do System.get_env(“MIX_ENV”) == “dev” end

defp get_node_basename() do System.get_env(“FOUNDATION_NODE_BASENAME”) || Application.get_env(:foundation, :node_basename, “foundation”) end

defp get_kubernetes_selector() do System.get_env(“FOUNDATION_K8S_SELECTOR”) || Application.get_env(:foundation, :kubernetes_selector, “app=foundation”) end

defp get_service_name() do System.get_env(“FOUNDATION_SERVICE_NAME”) || Application.get_env(:foundation, :service_name, “foundation”) end

defp get_dns_service() do System.get_env(“FOUNDATION_DNS_SERVICE”) || Application.get_env(:foundation, :dns_service, “foundation”) end

defp get_application_name() do System.get_env(“FOUNDATION_APP_NAME”) || Application.get_env(:foundation, :application_name, “foundation”) end

defp get_static_hosts() do case System.get_env(“FOUNDATION_STATIC_HOSTS”) do nil -> [] hosts_str -> hosts_str |> String.split(",") |> Enum.map(&String.to_atom/1) end end end

lib/foundation/strategies/mdns_lite.ex

defmodule Foundation.Strategies.MdnsLite do @moduledoc """ Development clustering strategy using mdns_lite for zero-config local clustering. """

@behaviour Cluster.Strategy use GenServer require Logger

def start_link(opts) do GenServer.start_link(MODULE, opts, name: MODULE) end

@impl true def init(opts) do service_name = Keyword.get(opts, :service_name, “foundation-dev”) auto_connect = Keyword.get(opts, :auto_connect, true) discovery_interval = Keyword.get(opts, :discovery_interval, 5000)

# Configure mdns_lite service
configure_mdns_service(service_name)

# Start service discovery if auto_connect is enabled
if auto_connect do
  schedule_discovery(discovery_interval)
end

state = %{
  service_name: service_name,
  auto_connect: auto_connect,
  discovery_interval: discovery_interval,
  discovered_nodes: MapSet.new()
}

Logger.info("Foundation mDNS strategy started for service: #{service_name}")
{:ok, state}

end

@impl true
def handle_info(:discover_nodes, state) do new_nodes = discover_foundation_nodes(state.service_name)

# Connect to newly discovered nodes
Enum.each(new_nodes, fn node ->
  unless node in state.discovered_nodes or node == Node.self() do
    Logger.info("Connecting to discovered Foundation node: #{node}")
    Node.connect(node)
  end
end)

# Schedule next discovery
schedule_discovery(state.discovery_interval)

new_state = %{state | discovered_nodes: MapSet.union(state.discovered_nodes, new_nodes)}
{:noreply, new_state}

end

defp configure_mdns_service(service_name) do # Get the current node’s distribution port distribution_port = get_distribution_port()

# Add Foundation service to mDNS
MdnsLite.add_mdns_service(%{
  id: :foundation_cluster,
  protocol: service_name,
  transport: "tcp",
  port: distribution_port,
  txt_payload: [
    "node=#{Node.self()}",
    "foundation_version=#{Foundation.version()}",
    "started_at=#{System.system_time(:second)}"
  ]
})

end

defp discover_foundation_nodes(service_name) do # Query mDNS for Foundation services case MdnsLite.query("_#{service_name}._tcp.local") do {:ok, services} -> services |> Enum.map(&extract_node_from_service/1) |> Enum.filter(& &1) |> MapSet.new()

  _ ->
    MapSet.new()
end

end

defp extract_node_from_service(service) do # Extract node name from mDNS service record case service do %{txt_payload: txt_records} -> txt_records |> Enum.find_value(fn record -> case String.split(record, “=”, parts: 2) do [“node”, node_name] -> String.to_atom(node_name) _ -> nil end end)

  _ -> nil
end

end

defp get_distribution_port() do # Get the port that the current node is listening on for distribution case :inet.port(:erlang.get_cookie()) do {:ok, port} -> port _ -> 4369 # Default EPMD port end end

defp schedule_discovery(interval) do Process.send_after(self(), :discover_nodes, interval) end end

==============================================================================

STEP 5: Messaging Layer (Phoenix.PubSub Integration)

==============================================================================

lib/foundation/pubsub_supervisor.ex

defmodule Foundation.PubSubSupervisor do @moduledoc """ Manages Phoenix.PubSub with intelligent configuration. """

use Supervisor

def start_link(messaging_config) do Supervisor.start_link(MODULE, messaging_config, name: MODULE) end

@impl true def init(messaging_config) do children = [ # Phoenix.PubSub with configuration based on profile {Phoenix.PubSub, build_pubsub_config(messaging_config)},

  # Foundation messaging manager
  {Foundation.Messaging, messaging_config},
  
  # Topic manager for intelligent routing
  Foundation.TopicManager
]

Supervisor.init(children, strategy: :one_for_one)

end

defp build_pubsub_config(messaging_config) do base_config = [ name: messaging_config.name, adapter: messaging_config.adapter ]

# Add additional configuration based on profile
case messaging_config do
  %{compression: true} ->
    Keyword.put(base_config, :compression, true)
  
  %{federated: true} ->
    # Configuration for federated PubSub across clusters
    Keyword.merge(base_config, [
      adapter: Phoenix.PubSub.Redis,
      redis_host: System.get_env("REDIS_HOST", "localhost")
    ])
  
  _ ->
    base_config
end

end end

lib/foundation/messaging.ex

defmodule Foundation.Messaging do @moduledoc """ Intelligent message routing across local and distributed boundaries. """

use GenServer require Logger

def start_link(config) do GenServer.start_link(MODULE, config, name: MODULE) end

@impl true def init(config) do {:ok, config} end

@doc """ Send a message intelligently based on target type. """ def send_message(target, message, opts \ []) do GenServer.call(MODULE, {:send_message, target, message, opts}) end

@doc """ Subscribe to a topic with optional pattern matching. """ def subscribe(topic, handler \ self()) do Phoenix.PubSub.subscribe(Foundation.PubSub, topic) Foundation.TopicManager.register_subscription(topic, handler) end

@doc """ Broadcast a message to a topic. """ def broadcast(topic, message, opts \ []) do case Keyword.get(opts, :compression, false) do true -> compressed_message = compress_message(message) Phoenix.PubSub.broadcast(Foundation.PubSub, topic, compressed_message)

  false ->
    Phoenix.PubSub.broadcast(Foundation.PubSub, topic, message)
end

end

@impl true def handle_call({:send_message, target, message, opts}, _from, state) do result = case resolve_target(target) do {:local, pid} -> send(pid, message) :ok

  {:remote, node, name} -> 
    send_remote_message(node, name, message, opts)
  
  {:service, service_name} -> 
    route_to_service(service_name, message, opts)
  
  {:broadcast, topic} -> 
    broadcast(topic, message, opts)
  
  {:error, reason} -> 
    {:error, reason}
end

{:reply, result, state}

end

Target resolution logic

defp resolve_target(target) do case target do pid when is_pid(pid) -> {:local, pid}

  {node, name} when is_atom(node) and is_atom(name) ->
    {:remote, node, name}
  
  {:service, service_name} ->
    {:service, service_name}
  
  {:broadcast, topic} ->
    {:broadcast, topic}
  
  {:via, registry, key} ->
    case registry.whereis_name(key) do
      pid when is_pid(pid) -> {:local, pid}
      :undefined -> {:error, :process_not_found}
    end
  
  _ ->
    {:error, :invalid_target}
end

end

defp send_remote_message(node, name, message, opts) do case Node.ping(node) do :pong -> GenServer.cast({name, node}, message) :ok

  :pang ->
    Logger.warning("Failed to reach node #{node}")
    {:error, :node_unreachable}
end

end

defp route_to_service(service_name, message, opts) do case Foundation.ServiceMesh.discover_service_instances(service_name) do [] -> {:error, :service_not_found}

  [instance] ->
    send_message(instance.pid, message, opts)
  
  instances ->
    # Load balance between instances
    strategy = Keyword.get(opts, :load_balance, :round_robin)
    instance = Foundation.LoadBalancer.select_instance(instances, strategy)
    send_message(instance.pid, message, opts)
end

end

defp compress_message(message) do compressed = :zlib.compress(:erlang.term_to_binary(message)) {:foundation_compressed, compressed} end end

==============================================================================

STEP 6: Process Management (Horde Integration)

==============================================================================

lib/foundation/process_supervisor.ex

defmodule Foundation.ProcessSupervisor do @moduledoc """ Manages process distribution using Horde or local supervisors. """

use Supervisor

def start_link(process_config) do Supervisor.start_link(MODULE, process_config, name: MODULE) end

@impl true def init(process_config) do children = case process_config.distribution do :horde -> setup_horde_supervision(process_config)

  :horde_multi_cluster ->
    setup_multi_cluster_horde(process_config)
  
  :local ->
    setup_local_supervision(process_config)
end

Supervisor.init(children, strategy: :one_for_one)

end

defp setup_horde_supervision(config) do [ # Horde.Registry for distributed process registry {Horde.Registry, keys: :unique, name: Foundation.ProcessRegistry, members: :auto },

  # Horde.DynamicSupervisor for distributed process supervision
  {Horde.DynamicSupervisor,
    name: Foundation.DistributedSupervisor,
    strategy: :one_for_one,
    members: :auto,
    delta_crdt_options: [sync_interval: config[:sync_interval] || 100]
  },
  
  # Foundation process manager
  {Foundation.ProcessManager, config}
]

end

defp setup_local_supervision(_config) do [ # Local registry {Registry, keys: :unique, name: Foundation.ProcessRegistry},

  # Local dynamic supervisor
  {DynamicSupervisor, name: Foundation.DistributedSupervisor, strategy: :one_for_one},
  
  # Foundation process manager  
  {Foundation.ProcessManager, %{distribution: :local}}
]

end

defp setup_multi_cluster_horde(config) do # Multi-cluster Horde setup - more complex configuration setup_horde_supervision(config) ++ [ Foundation.MultiClusterCoordinator ] end end