improved data loading performance

app/adapters/db_adapter.rb

@@ -73,8 +73,8 @@ class DbAdapter
         path:       entry[0],
         attributes: {
           data_type:  entry[1],
-          start_time: entry[2] || 0,
-          end_time:   entry[3] || 0,
+          start_time: entry[2],
+          end_time:   entry[3],
           total_rows: entry[4],
           total_time: entry[5]
         }.merge(metadata),

app/services/data/load_element_data.rb

@@ -59,10 +59,8 @@ class LoadElementData
     req_streams.each do |stream|
       adapter = DbAdapter.new(stream.db.url)
       data_service = LoadStreamData.new(adapter)
-      time = Benchmark.measure do
       data_service.run(stream, @start_time, @end_time,elements.to_a)
-      end
-      puts "------ DataService #{time}"
+
       if data_service.success?
         combined_data.concat(data_service.data)
       else

app/services/data/load_stream_data.rb

@@ -64,6 +64,7 @@ class LoadStreamData
     @decimation_factor = plottable_decim.level
     path = __build_path(db_stream, plottable_decim.level)
     resp = @db_adapter.get_data(path, start_time, end_time)
+
     if resp.nil?
       add_error("cannot get data for [#{path}] @ #{@db_adapter.url}")
       return self
@@ -77,11 +78,9 @@ class LoadStreamData
       decimateable_elements =
         elements.select{|e| %w(continuous discrete).include? e.display_type}
       interval_elements = elements.select{|e| e.display_type=='event'}
-      time = Benchmark.measure do
       @data = __build_decimated_data(decimateable_elements, resp) +
               __build_intervals_from_decimated_data(interval_elements, resp)
-      end
-      puts "---- [LoadStreamData] Build Dataset #{time}"
+
     end
     self
   end

config/routes.rb

@@ -19,7 +19,7 @@ Rails.application.routes.draw do
   end
   resources :db_elements, only: [:index] do
     collection do
-      post 'data'
+      get 'data'
     end
   end
 

spec/controllers/db_elements_controller_spec.rb

@@ -4,7 +4,7 @@ require 'rails_helper'
 RSpec.describe DbElementsController, type: :request do
   let(:user1) { create(:user, first_name: 'John') }
   let(:user2) { create(:user, first_name: 'Sam') }
-  describe 'POST #data' do
+  describe 'GET #data' do
     # retrieve data for elements listed by array of ids
     context 'with authenticated user' do
       before do
@@ -31,7 +31,7 @@ RSpec.describe DbElementsController, type: :request do
         allow(LoadElementData).to receive(:new).and_return(@mock_service)
 
         @auth_headers = user1.create_new_auth_token
-        post '/db_elements/data.json',
+        get '/db_elements/data.json',
             params: { elements: [@elem1.id, @elem2.id].to_json,
                       start_time: 0, end_time: 100, redux_json: 'new home view' },
             headers: @auth_headers
@@ -44,7 +44,7 @@ RSpec.describe DbElementsController, type: :request do
       end
       it 'returns error if time bounds are invalid' do
         @auth_headers = user1.create_new_auth_token
-        post '/db_elements/data.json',
+        get '/db_elements/data.json',
             params: { elements: [@elem1.id, @elem2.id].to_json,
                       start_time: 100, end_time: 0 },
             headers: @auth_headers
@@ -59,7 +59,7 @@ RSpec.describe DbElementsController, type: :request do
         stream2.db_elements << @elem3
 
         @auth_headers = user1.create_new_auth_token
-        post '/db_elements/data.json',
+        get '/db_elements/data.json',
             params: { elements: [@elem1.id, @elem3.id].to_json,
                       start_time: 100, end_time: 0 },
             headers: @auth_headers
@@ -68,7 +68,7 @@ RSpec.describe DbElementsController, type: :request do
     end
     context 'without sign-in' do
       it 'returns unauthorized' do
-        post '/db_elements/data.json'
+        get '/db_elements/data.json'
         expect(response).to have_http_status(:unauthorized)
       end
     end