Repository: proxystore/aeris

Issue:
Create simple Globus Compute launcher

Hints from issue comments:

Solution patch:
diff --git a/aeris/launcher/executor.py b/aeris/launcher/executor.py
new file mode 100644
index 0000000..fa62e67
--- /dev/null
+++ b/aeris/launcher/executor.py
@@ -0,0 +1,95 @@
+from __future__ import annotations
+
+import dataclasses
+import logging
+import sys
+from concurrent.futures import Executor
+from concurrent.futures import Future
+from types import TracebackType
+from typing import Any
+from typing import Generic
+from typing import TypeVar
+
+if sys.version_info >= (3, 11):  # pragma: >=3.11 cover
+    from typing import Self
+else:  # pragma: <3.11 cover
+    from typing_extensions import Self
+
+from aeris.agent import Agent
+from aeris.behavior import Behavior
+from aeris.exchange import Exchange
+from aeris.handle import Handle
+from aeris.identifier import AgentIdentifier
+
+logger = logging.getLogger(__name__)
+
+BehaviorT = TypeVar('BehaviorT', bound=Behavior)
+
+
+@dataclasses.dataclass
+class _RunningAgent(Generic[BehaviorT]):
+    agent: Agent[BehaviorT]
+    future: Future[None]
+
+
+class ExecutorLauncher:
+    """Launcher that wraps a [`concurrent.futures.Executor`][concurrent.futures.Executor].
+
+    Args:
+        exchange: Exchange used for communication.
+        executor: Executor used for launching agents. Note that this class
+            takes ownership of the `executor`.
+    """  # noqa: E501
+
+    def __init__(self, exchange: Exchange, executor: Executor) -> None:
+        self._exchange = exchange
+        self._executor = executor
+        self._agents: dict[AgentIdentifier, _RunningAgent[Any]] = {}
+
+    def __enter__(self) -> Self:
+        return self
+
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        exc_traceback: TracebackType | None,
+    ) -> None:
+        self.close()
+
+    def __repr__(self) -> str:
+        return (
+            f'{type(self).__name__}'
+            f'(exchange={self._exchange!r}, executor={self._executor!r})'
+        )
+
+    def __str__(self) -> str:
+        name = type(self).__name__
+        return (
+            f'{name}'
+            f'<{self._exchange}; {self._executor}; {len(self._agents)} agents>'
+        )
+
+    def close(self) -> None:
+        """Close the launcher and shutdown agents."""
+        logger.debug('%r waiting for all agents to shutdown', self)
+        self._executor.shutdown(wait=True)
+        logger.info('%r is closed', self)
+
+    def launch(self, behavior: Behavior) -> Handle:
+        """Launch a new agent with a specified behavior.
+
+        Args:
+            behavior: Behavior the agent should implement.
+
+        Returns:
+            Mailbox used to communicate with agent.
+        """
+        aid = self._exchange.register_agent()
+
+        agent = Agent(behavior, aid=aid, exchange=self._exchange)
+        future = self._executor.submit(agent)
+        self._agents[aid] = _RunningAgent(agent, future)
+        logger.info('%r launched %r', self, agent)
+
+        return self._exchange.create_handle(aid)


Test patch:
diff --git a/tests/launcher/executor_test.py b/tests/launcher/executor_test.py
new file mode 100644
index 0000000..11b8b07
--- /dev/null
+++ b/tests/launcher/executor_test.py
@@ -0,0 +1,50 @@
+from __future__ import annotations
+
+import threading
+import time
+from concurrent.futures import ThreadPoolExecutor
+
+from aeris.behavior import loop
+from aeris.exchange.thread import ThreadExchange
+from aeris.launcher import Launcher
+from aeris.launcher.executor import ExecutorLauncher
+from testing.constant import TEST_LOOP_SLEEP
+
+
+class SimpleBehavior:
+    def __init__(self) -> None:
+        self.steps = 0
+
+    def setup(self) -> None:
+        pass
+
+    def shutdown(self) -> None:
+        assert self.steps > 0
+
+    @loop
+    def count(self, shutdown: threading.Event) -> None:
+        while not shutdown.is_set():
+            self.steps += 1
+            time.sleep(TEST_LOOP_SLEEP)
+
+
+def test_launch_agents() -> None:
+    behavior = SimpleBehavior()
+    exchange = ThreadExchange()
+    executor = ThreadPoolExecutor(max_workers=2)
+
+    with ExecutorLauncher(exchange, executor) as launcher:
+        assert isinstance(launcher, Launcher)
+        assert isinstance(repr(launcher), str)
+        assert isinstance(str(launcher), str)
+
+        handle1 = launcher.launch(behavior)
+        handle2 = launcher.launch(behavior)
+
+        time.sleep(5 * TEST_LOOP_SLEEP)
+
+        handle1.shutdown()
+        handle2.shutdown()
+
+        handle1.close()
+        handle2.close()