[Findit] Refactoring WfTryJobData into BaseTryJobData, WfTryJobData, and FlakeTryJobData

appengine/findit/model/base_try_job.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.
 
 from google.appengine.ext import ndb
 
 from model import analysis_status
 
 
 class BaseTryJob(ndb.Model):
   """Represents a base try job result."""
 
   # The status of the try job.
   status = ndb.IntegerProperty(
       default=analysis_status.PENDING, indexed=False)
 
   # A list of try job IDs associated with each try job for collecting metadata.
   try_job_ids = ndb.JsonProperty(indexed=False, compressed=True)
 
   @property
   def completed(self):
     return self.status in (
         analysis_status.COMPLETED, analysis_status.ERROR)
 
   @property
   def failed(self):
     return self.status == analysis_status.ERROR
+
+  @classmethod
+  def GetMasterName(cls, key):
+    return key.pairs()[0][1].split('/')[0]
+
+  @classmethod
+  def GetBuilderName(cls, key):
+    return key.pairs()[0][1].split('/')[1]
+
+  @ndb.ComputedProperty
+  def master_name(self):
+    return self.GetMasterName(self.key)
+
+  @ndb.ComputedProperty
+  def builder_name(self):
+    return self.GetBuilderName(self.key)