CSIT-1104: Trending: Speed-up plots generation

Change-Id: Ia3916523d4fc9e05ec864af2a858a03dea46c73c
Signed-off-by: Tibor Frank <tifrank@cisco.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/resources/tools/presentation/utils.py b/resources/tools/presentation/utils.py
index ab86bafdd7..f32019dc2e 100644
--- a/resources/tools/presentation/utils.py
+++ b/resources/tools/presentation/utils.py
@@ -14,6 +14,7 @@
 """General purpose utilities.
 """
 
+import multiprocessing
 import subprocess
 import numpy as np
 import pandas as pd
@@ -271,3 +272,43 @@ def archive_input_data(spec):
                                 str(err))
 
     logging.info("    Done.")
+
+
+class Worker(multiprocessing.Process):
+    """Worker class used to process tasks in separate parallel processes.
+    """
+
+    def __init__(self, work_queue, data_queue, func):
+        """Initialization.
+
+        :param work_queue: Queue with items to process.
+        :param data_queue: Shared memory between processes. Queue which keeps
+            the result data. This data is then read by the main process and used
+            in further processing.
+        :param func: Function which is executed by the worker.
+        :type work_queue: multiprocessing.JoinableQueue
+        :type data_queue: multiprocessing.Manager().Queue()
+        :type func: Callable object
+        """
+        super(Worker, self).__init__()
+        self._work_queue = work_queue
+        self._data_queue = data_queue
+        self._func = func
+
+    def run(self):
+        """Method representing the process's activity.
+        """
+
+        while True:
+            try:
+                self.process(self._work_queue.get())
+            finally:
+                self._work_queue.task_done()
+
+    def process(self, item_to_process):
+        """Method executed by the runner.
+
+        :param item_to_process: Data to be processed by the function.
+        :type item_to_process: tuple
+        """
+        self._func(self.pid, self._data_queue, *item_to_process)