From 43d3dbafc78172030dee2545b25d4fe5a05d1eba Mon Sep 17 00:00:00 2001
From: Marco Capitani <m.capitani@nextworks.it>
Date: Wed, 10 May 2017 18:09:56 +0200
Subject: Storyboard: additions to the model

Means of distributions and other required fields.
---
 rumba/model.py | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

(limited to 'rumba/model.py')

diff --git a/rumba/model.py b/rumba/model.py
index 91f33a6..97af536 100644
--- a/rumba/model.py
+++ b/rumba/model.py
@@ -20,6 +20,7 @@
 # MA  02110-1301  USA
 
 import abc
+import random
 
 import rumba.log as log
 
@@ -572,20 +573,23 @@ class Experiment:
 # @options: Options to pass to the binary
 #
 class Client:
-    def __init__(self, ap, options=None):
+    def __init__(self, ap, duration, options=None):
         self.ap = ap
         self.options = options
+        self.duration = duration  # in seconds
 
 # Base class for server programs
 #
 # @ap: Application Process binary
+# @arrival_rate: Average requests/s to be received by this server
 # @options: Options to pass to the binary
 # @max_clients: Maximum number of clients to serve
 # @clients: Client binaries that will use this server
 # @nodes: Specific nodes to start this server on
 #
 class Server:
-    def __init__(self, ap, options=None, max_clients=None,
+    def __init__(self, ap, arrival_rate, mean_duration,
+                 options=None, max_clients=None,
                  clients=None, nodes=None):
         self.ap = ap
         self.options = options
@@ -594,6 +598,8 @@ class Server:
             clients = list()
         self.clients = clients
         self.nodes = nodes
+        self.arrival_rate = arrival_rate  # mean requests/s
+        self.mean_duration = mean_duration  # in seconds
 
     def add_client(self, client):
         self.clients.append(client)
@@ -607,6 +613,24 @@ class Server:
     def del_node(self, node):
         self.nodes.remove(node)
 
+    def get_new_clients(self, interval):
+        """
+        Returns a list of clients of size appropriate to the server's rate.
+         
+        The list's size should be a sample from Poisson(arrival_rate) over
+        interval seconds.
+        Hence, the average size should be interval * arrival_rate.
+        """
+        pass
+
+    def make_client(self):
+        """Returns a client of this server"""
+        if len(self.clients) == 0:
+            raise Exception("Server %s has empty client list," % (self,))
+        placeholder = 10  # TODO: Should be a sample from Exp(mean_duration)
+        return Client(random.choice(self.clients), placeholder)
+
+
 # Base class for ARCFIRE storyboards
 #
 # @experiment: Experiment to use as input
-- 
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