adding chapter 7 source code

Chapter7/multiprocessing/processes_casestudy.py

@@ -0,0 +1,55 @@
+#processes_casestudy.py
+
+import time
+from multiprocessing import Process, JoinableQueue
+from getfilelistpy import getfilelist
+import gdown
+
+PROCESSES_POOL_SIZE = 5
+
+#update the resource object as per your API key and the gdriver folder id
+resource = {
+    "api_key": "AIzaSyDYKmm85keqnk4bDpYa2bxddKrGns4z0",
+    "id": "0B8TxHW2Ci6dbckVweTRtV3RUU",
+    "fields": "files(name,id,webContentLink)",
+}
+
+def mydownloader( queue):
+    while True:
+        # Get the file id and name from the queue
+        item1 =  queue.get()
+        try:
+            gdown.download(item1['webContentLink'],
+                           './files/{}'.format(item1['name']),
+                           quiet=False)
+        finally:
+            queue.task_done()
+
+
+def get_files(resource):
+    res = getfilelist.GetFileList(resource)
+    files_list = res['fileList'][0]
+    return files_list
+
+def main ():
+
+    files = get_files(resource)
+    #add files info into the queue
+    myqueue = JoinableQueue()
+    for item in files['files']:
+        myqueue.put(item)
+
+    processes = []
+    for id in range(PROCESSES_POOL_SIZE):
+        p = Process(target=mydownloader,
+                    args=(myqueue,))
+        p.daemon = True
+        p.start()
+
+    start_time = time.monotonic()
+    myqueue.join()
+    total_exec_time = time.monotonic() - start_time
+
+    print(f'Time taken to download: {total_exec_time:.2f} seconds')
+
+main()