[GitHub] [beam] KevinGG commented on a change in pull request #12415: [BEAM-10603] Add the RecordingManager and associated classes.

[GitBox <gi...@apache.org>]

KevinGG commented on a change in pull request #12415:
URL: https://github.com/apache/beam/pull/12415#discussion_r473417825



##########
File path: sdks/python/apache_beam/runners/interactive/recording_manager.py
##########
@@ -0,0 +1,334 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+
+from __future__ import absolute_import
+
+import logging
+import threading
+import time
+import warnings
+
+import apache_beam as beam
+from apache_beam.runners.interactive import background_caching_job as bcj
+from apache_beam.runners.interactive import interactive_environment as ie
+from apache_beam.runners.interactive import interactive_runner as ir
+from apache_beam.runners.interactive import pipeline_fragment as pf
+from apache_beam.runners.interactive import pipeline_instrument as pi
+from apache_beam.runners.interactive import utils
+from apache_beam.runners.interactive.options.capture_limiters import CountLimiter
+from apache_beam.runners.interactive.options.capture_limiters import ProcessingTimeLimiter
+
+_LOGGER = logging.getLogger(__name__)
+
+PipelineState = beam.runners.runner.PipelineState
+
+
+class ElementStream:
+  """A stream of elements from a given PCollection."""
+  def __init__(
+      self,
+      pcoll,  # type: beam.pvalue.PCollection
+      var,  # type: str
+      cache_key,  # type: str
+      max_n,  # type: int
+      max_duration_secs  # type: float
+      ):
+    self._pcoll = pcoll
+    self._cache_key = cache_key
+    self._pipeline = pcoll.pipeline
+    self._var = var
+    self._n = max_n
+    self._duration_secs = max_duration_secs
+
+    # A small state variable that when True, indicates that no more new elements
+    # will be yielded if read() is called again.
+    self._done = False
+
+  def var(self):
+    # type: () -> str
+
+    """Returns the variable named that defined this PCollection."""
+    return self._var
+
+  def display_id(self, suffix):
+    #Any type: (str) -> str

Review comment:
       Is the `Any` some special type hint or a typo?




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