Merge pull request #207 from pyiron/universal_executor

Universal executor

pympipool/__init__.py

@@ -1,15 +1,58 @@
+import os
 from ._version import get_versions
 from pympipool.mpi.executor import PyMPIExecutor
 
 try:  # The PyFluxExecutor requires flux-core to be installed.
     from pympipool.flux.executor import PyFluxExecutor
+
+    flux_installed = "FLUX_URI" in os.environ
 except ImportError:
+    flux_installed = False
     pass
 
 try:  # The PySlurmExecutor requires the srun command to be available.
     from pympipool.slurm.executor import PySlurmExecutor
+
+    slurm_installed = True
 except ImportError:
+    slurm_installed = False
     pass
 
+
 __version__ = get_versions()["version"]
 del get_versions
+
+
+class Executor:
+    def __new__(
+        cls,
+        max_workers=1,
+        cores_per_worker=1,
+        init_function=None,
+        cwd=None,
+        sleep_interval=0.1,
+    ):
+        if flux_installed:
+            return PyFluxExecutor(
+                max_workers=max_workers,
+                cores_per_worker=cores_per_worker,
+                init_function=init_function,
+                cwd=cwd,
+                sleep_interval=sleep_interval,
+            )
+        elif slurm_installed:
+            return PySlurmExecutor(
+                max_workers=max_workers,
+                cores_per_worker=cores_per_worker,
+                init_function=init_function,
+                cwd=cwd,
+                sleep_interval=sleep_interval,
+            )
+        else:
+            return PyMPIExecutor(
+                max_workers=max_workers,
+                cores_per_worker=cores_per_worker,
+                init_function=init_function,
+                cwd=cwd,
+                sleep_interval=sleep_interval,
+            )