remove examples gateway. (#1250)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

MultimodalQnA/multimodalqna.py

@@ -7,7 +7,7 @@ import os
 from io import BytesIO
 
 import requests
-from comps import Gateway, MegaServiceEndpoint, MicroService, ServiceOrchestrator, ServiceType
+from comps import MegaServiceEndpoint, MicroService, ServiceOrchestrator, ServiceRoleType, ServiceType
 from comps.cores.proto.api_protocol import (
     ChatCompletionRequest,
     ChatCompletionResponse,
@@ -29,7 +29,7 @@ LVM_SERVICE_HOST_IP = os.getenv("LVM_SERVICE_HOST_IP", "0.0.0.0")
 LVM_SERVICE_PORT = int(os.getenv("LVM_SERVICE_PORT", 9399))
 
 
-class MultimodalQnAService(Gateway):
+class MultimodalQnAService:
     asr_port = int(os.getenv("ASR_SERVICE_PORT", 3001))
     asr_endpoint = os.getenv("ASR_SERVICE_ENDPOINT", "http://0.0.0.0:{}/v1/audio/transcriptions".format(asr_port))
 
@@ -38,6 +38,7 @@ class MultimodalQnAService(Gateway):
         self.port = port
         self.lvm_megaservice = ServiceOrchestrator()
         self.megaservice = ServiceOrchestrator()
+        self.endpoint = str(MegaServiceEndpoint.MULTIMODAL_QNA)
 
     def add_remote_service(self):
         mm_embedding = MicroService(
@@ -74,7 +75,6 @@ class MultimodalQnAService(Gateway):
         # for lvm megaservice
         self.lvm_megaservice.add(lvm)
 
-    # this overrides _handle_message method of Gateway
     def _handle_message(self, messages):
         images = []
         audios = []
@@ -303,14 +303,17 @@ class MultimodalQnAService(Gateway):
         return ChatCompletionResponse(model="multimodalqna", choices=choices, usage=usage)
 
     def start(self):
-        super().__init__(
-            megaservice=self.megaservice,
+        self.service = MicroService(
+            self.__class__.__name__,
+            service_role=ServiceRoleType.MEGASERVICE,
             host=self.host,
             port=self.port,
-            endpoint=str(MegaServiceEndpoint.MULTIMODAL_QNA),
+            endpoint=self.endpoint,
             input_datatype=ChatCompletionRequest,
             output_datatype=ChatCompletionResponse,
         )
+        self.service.add_route(self.endpoint, self.handle_request, methods=["POST"])
+        self.service.start()
 
 
 if __name__ == "__main__":