rohdesamuel commented on a change in pull request #11005: [BEAM-8335] Modify
the StreamingCache to subclass the CacheManager
URL: https://github.com/apache/beam/pull/11005#discussion_r391189581
##########
File path: sdks/python/apache_beam/runners/interactive/cache_manager.py
##########
@@ -167,20 +196,38 @@ def load_pcoder(self, *labels):
self._saved_pcoders[self._path(*labels)])
def read(self, *labels):
+ # Return an iterator to an empty list if it doesn't exist.
if not self.exists(*labels):
- return [], -1
+ return iter([]), -1
- source = self.source(*labels)
+ # Otherwise, return a generator to the cached PCollection.
+ source = self._source(*labels)
range_tracker = source.get_range_tracker(None, None)
- result = list(source.read(range_tracker))
+ reader = source.read(range_tracker)
version = self._latest_version(*labels)
- return result, version
+ return reader, version
+
+ def write(self, values, *labels):
+ sink = self._sink(*labels)
+ path = self._path(*labels)
+
+ init_result = sink.initialize_write()
+ writer = sink.open_writer(init_result, path)
+ for v in values:
+ writer.write(v)
+ writer.close()
def source(self, *labels):
+ return beam.io.Read(self._source(*labels))
+
+ def sink(self, labels):
+ return beam.io.Write(self._sink(*labels))
+
+ def _source(self, *labels):
return self._reader_class(
self._glob_path(*labels), coder=self.load_pcoder(*labels))._source
- def sink(self, *labels):
+ def _sink(self, *labels):
return self._writer_class(
Review comment:
Done
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