adding chapter 7 source code

Chapter7/multithreading/threads_casestudy.py

@@ -0,0 +1,60 @@
+#threads_casestudy.py
+from queue import Queue
+from threading import Thread
+import time
+
+from getfilelistpy import getfilelist
+import gdown
+THREAD_POOL_SIZE = 5
+
+#update the resource object as per your API key and the gdriver folder id
+resource = {
+    "api_key": "AIzaSyDYKmm85keq4bF1DpYa2bxddKrGns4z0",
+    "id": "0B8TxHW2Ci6dbckVwtTlV3RUU",
+    "fields": "files(name,id,webContentLink)",
+}
+
+class DownlaodWorker(Thread):
+
+    def __init__(self, name, queue):
+        Thread.__init__(self)
+        self.name = name
+        self.queue = queue
+
+    def run(self):
+        while True:
+            # Get the file id and name from the queue
+            item1 = self.queue.get()
+            try:
+                gdown.download( item1['webContentLink'],
+                                './files/{}'.format(item1['name']),
+                                quiet=False)
+            finally:
+                self.queue.task_done()
+
+def main():
+    def get_files(resource):
+        #global files_list
+        res = getfilelist.GetFileList(resource)
+        files_list = res['fileList'][0]
+        return files_list
+
+    start_time = time.monotonic()
+
+    files = get_files(resource)
+
+    #add files info into the queue
+    queue = Queue()
+    for item in files['files']:
+        queue.put(item)
+
+    for i in range (THREAD_POOL_SIZE):
+        worker = DownlaodWorker("Thread {}".format(i+1),queue)
+        worker.daemon = True
+        worker.start()
+
+    queue.join()
+    end_time = time.monotonic()
+    print('Time taken to download: {} seconds'.
+          format( end_time - start_time))
+main()