structure saas with tools

.venv/lib/python3.10/site-packages/google/adk/agents/parallel_agent.py

@@ -0,0 +1,96 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Parallel agent implementation."""
+
+from __future__ import annotations
+
+import asyncio
+from typing import AsyncGenerator
+
+from typing_extensions import override
+
+from ..agents.invocation_context import InvocationContext
+from ..events.event import Event
+from .base_agent import BaseAgent
+
+
+def _set_branch_for_current_agent(
+    current_agent: BaseAgent, invocation_context: InvocationContext
+):
+  invocation_context.branch = (
+      f"{invocation_context.branch}.{current_agent.name}"
+      if invocation_context.branch
+      else current_agent.name
+  )
+
+
+async def _merge_agent_run(
+    agent_runs: list[AsyncGenerator[Event, None]],
+) -> AsyncGenerator[Event, None]:
+  """Merges the agent run event generator.
+
+  This implementation guarantees for each agent, it won't move on until the
+  generated event is processed by upstream runner.
+
+  Args:
+      agent_runs: A list of async generators that yield events from each agent.
+
+  Yields:
+      Event: The next event from the merged generator.
+  """
+  tasks = [
+      asyncio.create_task(events_for_one_agent.__anext__())
+      for events_for_one_agent in agent_runs
+  ]
+  pending_tasks = set(tasks)
+
+  while pending_tasks:
+    done, pending_tasks = await asyncio.wait(
+        pending_tasks, return_when=asyncio.FIRST_COMPLETED
+    )
+    for task in done:
+      try:
+        yield task.result()
+
+        # Find the generator that produced this event and move it on.
+        for i, original_task in enumerate(tasks):
+          if task == original_task:
+            new_task = asyncio.create_task(agent_runs[i].__anext__())
+            tasks[i] = new_task
+            pending_tasks.add(new_task)
+            break  # stop iterating once found
+
+      except StopAsyncIteration:
+        continue
+
+
+class ParallelAgent(BaseAgent):
+  """A shell agent that run its sub-agents in parallel in isolated manner.
+
+  This approach is beneficial for scenarios requiring multiple perspectives or
+  attempts on a single task, such as:
+
+  - Running different algorithms simultaneously.
+  - Generating multiple responses for review by a subsequent evaluation agent.
+  """
+
+  @override
+  async def _run_async_impl(
+      self, ctx: InvocationContext
+  ) -> AsyncGenerator[Event, None]:
+    _set_branch_for_current_agent(self, ctx)
+    agent_runs = [agent.run_async(ctx) for agent in self.sub_agents]
+    async for event in _merge_agent_run(agent_runs):
+      yield event