[Findit] Pass changed files info to Fracas, 2 face design.

appengine/findit/crash/scorers/aggregated_scorer.py

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Uses aggregators to aggregator results from different scorers."""
+
+from crash.scorer import aggregators
+
+
+class AggregatedScorer(object):
+
+  def __init__(self, scorers,
+               score_aggregator=aggregators.Multiplier(),
+               reasons_aggregator=aggregators.IdentityAggregator(),

[stgao, 2016/07/15 23:25:28]

Can we move this default value to function ``Score`` below?

[Sharu Jiang, 2016/07/18 00:31:58]

Done.

+               changed_files_aggregator=aggregators.ChangedFilesAggregator()):
+    self.scorers = scorers
+    self.score_aggregator = score_aggregator
+    self.reasons_aggregator = reasons_aggregator
+    self.changed_files_aggregator = changed_files_aggregator
+
+  def Score(self, result,
+            score_aggregator=None,
+            reasons_aggregator=None,
+            changed_files_aggregator=None):
+    """Aggregates score, reasons and changed_files from all the scorers.
+
+    Note: This method sets confidence, reasons and changed_files of results.
+    """
+    if score_aggregator is None:
+      score_aggregator = self.score_aggregator
+
+    if reasons_aggregator is None:
+      reasons_aggregator = self.reasons_aggregator
+
+    if changed_files_aggregator is None:
+      changed_files_aggregator = self.changed_files_aggregator
+
+    # Transforms array of [(score1, reason1, changed_files1), (score2, reason2,
+    # changed_files2)] to [(score1, score2), (reason1, reason2),
+    # (changed_files1, changed_files2)] for aggregators to aggregate.
+    scores, reasons, changed_files = zip(*[
+        scorer(result) for scorer in self.scorers])
+
+    # Only keep the first 2 digits after decimal point.
+    result.confidence = score_aggregator(list(scores))
+    result.reasons = reasons_aggregator(list(reasons))
+    result.changed_files = changed_files_aggregator(list(changed_files))
+
+    return result.confidence, result.reasons, result.changed_files