Merge pull request #8911 from jdevera/python_client_lazy_threadpool_init

[Python client] Lazily initialize thread pool in API client

Author: HugoMario

modules/swagger-codegen/src/main/resources/python/api_client.mustache

@@ -60,7 +60,7 @@ class ApiClient(object):
             configuration = Configuration()
         self.configuration = configuration
 
-        self.pool = ThreadPool()
+        self._pool = None  # Use the pool property to lazily initialize the ThreadPool.
         self.rest_client = rest.RESTClientObject(configuration)
         self.default_headers = {}
         if header_name is not None:
@@ -70,8 +70,15 @@ class ApiClient(object):
         self.user_agent = '{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}Swagger-Codegen/{{{packageVersion}}}/python{{/httpUserAgent}}'
 
     def __del__(self):
-        self.pool.close()
-        self.pool.join()
+        if self._pool is not None:
+            self._pool.close()
+            self._pool.join()
+
+    @property
+    def pool(self):
+        if self._pool is None:
+            self._pool = ThreadPool()
+        return self._pool
 
     @property
     def user_agent(self):

samples/client/petstore/python-asyncio/petstore_api/api_client.py

@@ -66,7 +66,7 @@ def __init__(self, configuration=None, header_name=None, header_value=None,
             configuration = Configuration()
         self.configuration = configuration
 
-        self.pool = ThreadPool()
+        self._pool = None  # Use the pool property to lazily initialize the ThreadPool.
         self.rest_client = rest.RESTClientObject(configuration)
         self.default_headers = {}
         if header_name is not None:
@@ -76,8 +76,15 @@ def __init__(self, configuration=None, header_name=None, header_value=None,
         self.user_agent = 'Swagger-Codegen/1.0.0/python'
 
     def __del__(self):
-        self.pool.close()
-        self.pool.join()
+        if self._pool is not None:
+            self._pool.close()
+            self._pool.join()
+
+    @property
+    def pool(self):
+        if self._pool is None:
+            self._pool = ThreadPool()
+        return self._pool
 
     @property
     def user_agent(self):

samples/client/petstore/python-tornado/petstore_api/api_client.py

@@ -67,7 +67,7 @@ def __init__(self, configuration=None, header_name=None, header_value=None,
             configuration = Configuration()
         self.configuration = configuration
 
-        self.pool = ThreadPool()
+        self._pool = None  # Use the pool property to lazily initialize the ThreadPool.
         self.rest_client = rest.RESTClientObject(configuration)
         self.default_headers = {}
         if header_name is not None:
@@ -77,8 +77,15 @@ def __init__(self, configuration=None, header_name=None, header_value=None,
         self.user_agent = 'Swagger-Codegen/1.0.0/python'
 
     def __del__(self):
-        self.pool.close()
-        self.pool.join()
+        if self._pool is not None:
+            self._pool.close()
+            self._pool.join()
+
+    @property
+    def pool(self):
+        if self._pool is None:
+            self._pool = ThreadPool()
+        return self._pool
 
     @property
     def user_agent(self):

samples/client/petstore/python/petstore_api/api_client.py

@@ -66,7 +66,7 @@ def __init__(self, configuration=None, header_name=None, header_value=None,
             configuration = Configuration()
         self.configuration = configuration
 
-        self.pool = ThreadPool()
+        self._pool = None  # Use the pool property to lazily initialize the ThreadPool.
         self.rest_client = rest.RESTClientObject(configuration)
         self.default_headers = {}
         if header_name is not None:
@@ -76,8 +76,15 @@ def __init__(self, configuration=None, header_name=None, header_value=None,
         self.user_agent = 'Swagger-Codegen/1.0.0/python'
 
     def __del__(self):
-        self.pool.close()
-        self.pool.join()
+        if self._pool is not None:
+            self._pool.close()
+            self._pool.join()
+
+    @property
+    def pool(self):
+        if self._pool is None:
+            self._pool = ThreadPool()
+        return self._pool
 
     @property
     def user_agent(self):