AsyncFlow-Sim · GioeleB00 · Sep 2, 2025 · Sep 2, 2025
diff --git a/docs/api/components.md b/docs/api/components.md
@@ -17,7 +17,7 @@ These classes are Pydantic models with strict validation and are the
 from asyncflow.components import (
     Client,
     Server,
-    ServerResources,
+    NodesResources,
     LoadBalancer,
     Endpoint,
     Edge,
@@ -32,7 +32,7 @@ from asyncflow.enums import Distribution
 
 ```python
 from asyncflow.components import (
-    Client, Server, ServerResources, LoadBalancer, Endpoint, Edge
+    Client, Server, NodesResources, LoadBalancer, Endpoint, Edge
 )
 
 # Nodes
@@ -49,7 +49,7 @@ endpoint = Endpoint(
 
 server = Server(
     id="srv-1",
-    server_resources=ServerResources(cpu_cores=2, ram_mb=2048),
+    server_resources=NodesResources(cpu_cores=2, ram_mb=2048),
     endpoints=[endpoint],
 )
 
@@ -103,18 +103,18 @@ Client(id: str)
 
 ---
 
-### `ServerResources`
+### `NodesResources`
 
 ```python
-ServerResources(
+NodesResources(
     cpu_cores: int = 1,          # ≥ 1 NOW MUST BE FIXED TO ONE
     ram_mb: int = 1024,          # ≥ 256
     db_connection_pool: int | None = None,
 )
 ```
 
 * Server capacity knobs used by the runtime (CPU tokens, RAM reservoir, optional DB pool).
-* You may pass a **dict** instead of `ServerResources`; Pydantic will coerce it.
+* You may pass a **dict** instead of `NodesResources`; Pydantic will coerce it.
 
 **Bounds & defaults**
 
@@ -166,7 +166,7 @@ Each step is a dict with **exactly one** operation:
 ```python
 Server(
     id: str,
-    server_resources: ServerResources | dict,
+    server_resources: NodesResources | dict,
     endpoints: list[Endpoint],
 )
 ```
@@ -234,7 +234,7 @@ Edge(
 ## Type coercion & enums
 
 * You may pass strings for enums (`kind`, `distribution`, etc.); they will be validated against the allowed values.
-* For `ServerResources` and `Edge.latency` you can pass dictionaries; Pydantic will coerce them to typed models.
+* For `NodesResources` and `Edge.latency` you can pass dictionaries; Pydantic will coerce them to typed models.
 * If you prefer, you can import and use the enums:
 
   ```python

diff --git a/docs/index.md b/docs/index.md
@@ -14,7 +14,7 @@ AsyncFlow is a discrete-event simulator for Python async backends (FastAPI/Uvico
 ## Public API (stable surface)
 
 * **[High-Level API](api/high-level.md)** — The two entry points you’ll use most: `AsyncFlow` (builder) and `SimulationRunner` (orchestrator).
-* **[Components](api/components.md)** — Public Pydantic models for topology: `Client`, `Server`, `Endpoint`, `Edge`, `LoadBalancer`, `ServerResources`.
+* **[Components](api/components.md)** — Public Pydantic models for topology: `Client`, `Server`, `Endpoint`, `Edge`, `LoadBalancer`, `NodesResources`.
 * **[Workload](api/workload.md)** — Traffic inputs: `RqsGenerator` and `RVConfig` (random variables).
 * **[Settings](api/settings.md)** — Global controls: `SimulationSettings` (duration, sampling cadence, metrics).
 * **[Enums](api/enums.md)** — Optional importable enums: distributions, step kinds/ops, metric names, node/edge types, LB algorithms.

diff --git a/docs/internals/runtime-and-resources.md b/docs/internals/runtime-and-resources.md
@@ -88,7 +88,7 @@ AsyncFlow mirrors that physical constraint through the **Resource layer**, which
 
 | Responsibility        | Implementation detail                                                                                                                                                                                            |
 | --------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| **Discover capacity** | Walks the *validated* `TopologyGraph.nodes.servers`, reading `cpu_cores` and `ram_mb` from each `ServerResources` spec.                                                                                          |
+| **Discover capacity** | Walks the *validated* `TopologyGraph.nodes.servers`, reading `cpu_cores` and `ram_mb` from each `NodesResources` spec.                                                                                          |
 | **Mint containers**   | Calls `build_containers(env, spec)` which returns<br>`{"CPU": simpy.Container(init=cpu_cores), "RAM": simpy.Container(init=ram_mb)}` — the containers start **full** so a server can immediately consume tokens. |
 | **Registry map**      | Stores them in a private dict `_by_server: dict[str, ServerContainers]`.                                                                                                                                         |
 | **Public API**        | `registry[server_id] → ServerContainers` (raises `KeyError` if the ID is unknown).                                                                                                                               |

diff --git a/docs/internals/simulation-input.md b/docs/internals/simulation-input.md
@@ -114,15 +114,15 @@ class Client(BaseModel):
     # validator: type must equal SystemNodes.CLIENT
 ```
 
-#### `ServerResources`
+#### `NodesResources`
 
 ```python
-class ServerResources(BaseModel):
-    cpu_cores: PositiveInt = Field(ServerResourcesDefaults.CPU_CORES,
-                                   ge=ServerResourcesDefaults.MINIMUM_CPU_CORES)
-    db_connection_pool: PositiveInt | None = Field(ServerResourcesDefaults.DB_CONNECTION_POOL)
-    ram_mb: PositiveInt = Field(ServerResourcesDefaults.RAM_MB,
-                                ge=ServerResourcesDefaults.MINIMUM_RAM_MB)
+class NodesResources(BaseModel):
+    cpu_cores: PositiveInt = Field(NodesResourcesDefaults.CPU_CORES,
+                                   ge=NodesResourcesDefaults.MINIMUM_CPU_CORES)
+    db_connection_pool: PositiveInt | None = Field(NodesResourcesDefaults.DB_CONNECTION_POOL)
+    ram_mb: PositiveInt = Field(NodesResourcesDefaults.RAM_MB,
+                                ge=NodesResourcesDefaults.MINIMUM_RAM_MB)
 ```
 
 Each attribute maps directly to a SimPy primitive (core tokens, RAM container, optional DB pool).
@@ -164,7 +164,7 @@ Canonical lowercase names avoid accidental duplicates by case.
 class Server(BaseModel):
     id: str
     type: SystemNodes = SystemNodes.SERVER
-    server_resources: ServerResources
+    server_resources: NodesResources
     endpoints: list[Endpoint]
     # validator: type must equal SystemNodes.SERVER
 ```
@@ -302,7 +302,7 @@ class SimulationSettings(BaseModel):
 ### Nodes
 
 * `Client.type == client`, `Server.type == server`, `LoadBalancer.type == load_balancer` (enforced).
-* `ServerResources` obey lower bounds: `cpu_cores ≥ 1`, `ram_mb ≥ 256`.
+* `NodesResources` obey lower bounds: `cpu_cores ≥ 1`, `ram_mb ≥ 256`.
 * `TopologyNodes` contains **unique ids** across `client`, `servers[]`, and (optional) `load_balancer`. Duplicates → `ValueError`.
 * `TopologyNodes` forbids unknown fields (`extra="forbid"`).
 

diff --git a/src/asyncflow/components/__init__.py b/src/asyncflow/components/__init__.py
@@ -7,8 +7,8 @@
 from asyncflow.schemas.topology.nodes import (
     Client,
     LoadBalancer,
+    NodesResources,
     Server,
-    ServerResources,
 )
 
 __all__ = [
@@ -17,8 +17,8 @@
     "Endpoint",
     "EventInjection",
     "LoadBalancer",
+    "NodesResources",
     "Server",
-    "ServerResources",
     ]
 
 
diff --git a/src/asyncflow/config/constants.py b/src/asyncflow/config/constants.py
@@ -117,7 +117,7 @@ class StepOperation(StrEnum):
 # CONSTANTS FOR THE RESOURCES OF A SERVER
 # ======================================================================
 
-class ServerResourcesDefaults:
+class NodesResourcesDefaults:
     """Resources available for a single server"""
 
     CPU_CORES = 1

diff --git a/src/asyncflow/resources/server_containers.py b/src/asyncflow/resources/server_containers.py
@@ -12,7 +12,7 @@
 import simpy
 
 from asyncflow.config.constants import ServerResourceName
-from asyncflow.schemas.topology.nodes import ServerResources
+from asyncflow.schemas.topology.nodes import NodesResources
 
 # ==============================================================
 # DICT FOR THE REGISTRY TO INITIALIZE RESOURCES FOR EACH SERVER
@@ -33,12 +33,12 @@ class ServerContainers(TypedDict):
 # Central funcrion to initialize  the dictionary with ram and cpu container
 def build_containers(
     env: simpy.Environment,
-    spec: ServerResources,
+    spec: NodesResources,
     ) -> ServerContainers:
     """
     Construct and return a mapping of SimPy Containers for a server's CPU and RAM.
 
-    Given a SimPy environment and a validated ServerResources spec, this function
+    Given a SimPy environment and a validated NodesResources spec, this function
     initializes one simpy.Container for CPU (with capacity equal to cpu_cores)
     and one for RAM (with capacity equal to ram_mb), then returns them in a
     ServerContainers TypedDict keyed by "CPU" and "RAM".
@@ -47,7 +47,7 @@ def build_containers(
     ----------
     env : simpy.Environment
         The simulation environment in which the Containers will be created.
-    spec : ServerResources
+    spec : NodesResources
         A Pydantic model instance defining the server's cpu_cores and ram_mb.
 
     Returns

diff --git a/src/asyncflow/runtime/actors/server.py b/src/asyncflow/runtime/actors/server.py
@@ -196,7 +196,7 @@ def _handle_request( # noqa: PLR0915, PLR0912, C901
 
         for step in selected_endpoint.steps:
 
-            if step.kind in EndpointStepCPU:
+            if isinstance(step.kind, EndpointStepCPU):
                 # with the boolean we avoid redundant operation of asking
                 # the core multiple time on a given step
                 # for example if we have two consecutive cpu bound step
@@ -232,7 +232,7 @@ def _handle_request( # noqa: PLR0915, PLR0912, C901
 
             # since the object is of an Enum class we check if the step.kind
             # is one member of enum
-            elif step.kind in EndpointStepIO:
+            elif isinstance(step.kind, EndpointStepIO):
                 # define the io time
                 io_time = step.step_operation[StepOperation.IO_WAITING_TIME]
 
@@ -244,7 +244,7 @@ def _handle_request( # noqa: PLR0915, PLR0912, C901
                     if not is_in_io_queue:
                         is_in_io_queue = True
                         self._el_io_queue_len += 1
-                
+
                 # here is a sage check: the first step should always
                 # be a cpu bound (parsing of the request), if an user
                 # start with a I/O this allow to don't break the flux
@@ -305,6 +305,21 @@ def _dispatcher(self) -> Generator[simpy.Event, None, None]:
         The main dispatcher loop. It pulls requests from the inbox and
         spawns a new '_handle_request' process for each one.
         """
+        # we assume in the current model that there is a one
+        # to one correspondence between cpu cores and workers
+        # before entering in the loop in the current implementation
+        # we reserve the ram necessary to run the processes
+        if self.server_config.ram_per_process:
+            processes_ram = (
+                self.server_config.ram_per_process *
+                self.server_config.server_resources.cpu_cores
+            )
+
+            yield self.server_resources[
+                ServerResourceName.RAM.value
+                ].get(processes_ram)
+
+
         while True:
             # Wait for a request to arrive in the server's inbox
             raw_state = yield self.server_box.get()