Concurent safe batch saver

app/models/manager_refresh/save_collection/saver/base.rb

@@ -2,6 +2,7 @@ module ManagerRefresh::SaveCollection
   module Saver
     class Base
       include Vmdb::Logging
+      include ManagerRefresh::SaveCollection::Saver::SqlHelper
 
       attr_reader :inventory_collection
 
@@ -31,6 +32,10 @@ def save_inventory_collection!
 
       attr_reader :unique_index_keys, :unique_db_primary_keys
 
+      def batch_size
+        1000
+      end
+
       def delete_complement(inventory_collection)
         return unless inventory_collection.delete_allowed?
 
@@ -55,6 +60,12 @@ def delete_complement(inventory_collection)
                   "#{all_manager_uuids_size}, deleted=#{deleted_counter} *************")
       end
 
+      def delete_record!(inventory_collection, record)
+        return false unless inventory_collection.delete_allowed?
+        record.public_send(inventory_collection.delete_method)
+        true
+      end
+
       def assert_distinct_relation(record)
         if unique_db_primary_keys.include?(record.id) # Include on Set is O(1)
           # Change the InventoryCollection's :association or :arel parameter to return distinct results. The :through
@@ -75,12 +86,11 @@ def assert_distinct_relation(record)
 
       def assert_referential_integrity(hash, inventory_object)
         inventory_object.inventory_collection.fixed_foreign_keys.each do |x|
-          if hash[x].blank?
-            _log.info("Ignoring #{inventory_object} because of missing foreign key #{x} for "\
-                      "#{inventory_object.inventory_collection.parent.class.name}:"\
-                      "#{inventory_object.inventory_collection.parent.id}")
-            return false
-          end
+          next unless hash[x].blank?
+          _log.info("Ignoring #{inventory_object} because of missing foreign key #{x} for "\
+                    "#{inventory_object.inventory_collection.parent.class.name}:"\
+                    "#{inventory_object.inventory_collection.parent.id}")
+          return false
         end
         true
       end

app/models/manager_refresh/save_collection/saver/concurrent_safe.rb

@@ -19,59 +19,42 @@ def save!(inventory_collection, association)
         created_counter           = 0
         _log.info("*************** PROCESSING #{inventory_collection} of size #{inventory_collection_size} *************")
         # Records that are in the DB, we will be updating or deleting them.
-        association.find_in_batches do |batch|
-          ActiveRecord::Base.transaction do
-            batch.each do |record|
-              next unless assert_distinct_relation(record)
-
-              index = inventory_collection.object_index_with_keys(unique_index_keys, record)
-
-              inventory_object = inventory_objects_index.delete(index)
-              hash             = attributes_index.delete(index)
-
-              if inventory_object.nil?
-                # Record was found in the DB but not sent for saving, that means it doesn't exist anymore and we should
-                # delete it from the DB.
-                # TODO(lsmola) do a transaction for a batches of deletion
-                deleted_counter += 1 if delete_record!(inventory_collection, record)
-              else
-                # Record was found in the DB and sent for saving, we will be updating the DB.
-                update_record!(inventory_collection, record, hash, inventory_object)
-              end
+        ActiveRecord::Base.transaction do
+          association.find_each do |record|
+            next unless assert_distinct_relation(record)
+
+            index = inventory_collection.object_index_with_keys(unique_index_keys, record)
+
+            inventory_object = inventory_objects_index.delete(index)
+            hash             = attributes_index.delete(index)
+
+            if inventory_object.nil?
+              # Record was found in the DB but not sent for saving, that means it doesn't exist anymore and we should
+              # delete it from the DB.
+              deleted_counter += 1 if delete_record!(inventory_collection, record)
+            else
+              # Record was found in the DB and sent for saving, we will be updating the DB.
+              update_record!(inventory_collection, record, hash, inventory_object)
             end
           end
         end
 
         # Records that were not found in the DB but sent for saving, we will be creating these in the DB.
         if inventory_collection.create_allowed?
-          inventory_objects_index.each_slice(1000) do |batch|
-            ActiveRecord::Base.transaction do
-              batch.each do |index, inventory_object|
-                hash = attributes_index.delete(index)
-                create_record!(inventory_collection, hash, inventory_object)
-                created_counter += 1
-              end
+          ActiveRecord::Base.transaction do
+            inventory_objects_index.each do |index, inventory_object|
+              create_record!(inventory_collection, attributes_index.delete(index), inventory_object)
+              created_counter += 1
             end
           end
         end
         _log.info("*************** PROCESSED #{inventory_collection}, created=#{created_counter}, "\
                   "updated=#{inventory_collection_size - created_counter}, deleted=#{deleted_counter} *************")
       end
 
-      def delete_record!(inventory_collection, record)
-        return false unless inventory_collection.delete_allowed?
-        record.public_send(inventory_collection.delete_method)
-        true
-      end
-
       def update_record!(inventory_collection, record, hash, inventory_object)
         record.assign_attributes(hash.except(:id, :type))
 
-        # TODO(lsmola) ignore all N:M relations, since we use pure SQL, all N:M needs to be modeled as a separate IC, or
-        # can we process those automatically? Using a convention? But still, it needs to be a separate IC, to have
-        # efficient saving.
-        hash.reject! { |_key, value| value.kind_of?(Array) }
-
         if !inventory_object.inventory_collection.check_changed? || record.changed?
           update_query = inventory_object.inventory_collection.model_class.where(:id => record.id)
           if hash[:remote_data_timestamp]
@@ -88,31 +71,12 @@ def update_record!(inventory_collection, record, hash, inventory_object)
       def create_record!(inventory_collection, hash, inventory_object)
         return unless assert_referential_integrity(hash, inventory_object)
 
-        hash[:type]  = inventory_collection.model_class.name if inventory_collection.supports_sti? && hash[:type].blank?
-        table_name   = inventory_object.inventory_collection.model_class.table_name
-        insert_query = %{
-        INSERT INTO #{table_name} (#{hash.keys.join(", ")})
-          VALUES
-            (
-              #{hash.values.map { |x| ActiveRecord::Base.connection.quote(x) }.join(", ")}
-            )
-          ON CONFLICT (#{inventory_object.inventory_collection.unique_index_columns.join(", ")})
-            DO
-              UPDATE
-                SET #{hash.keys.map { |x| "#{x} = EXCLUDED.#{x}" }.join(", ")}
-        }
-        # TODO(lsmola) do we want to exclude the ems_id from the UPDATE clause? Otherwise it might be difficult to change
-        # the ems_id as a cross manager migration, since ems_id should be there as part of the insert. The attempt of
-        # changing ems_id could lead to putting it back by a refresh.
+        all_attribute_keys = hash.keys
+        hash               = inventory_collection.model_class.new(hash).attributes.symbolize_keys
 
-        # This conditional will avoid rewriting new data by old data. But we want it only when remote_data_timestamp is a
-        # part of the data, since for the fake records, we just want to update ems_ref.
-        if hash[:remote_data_timestamp].present?
-          insert_query += %{
-          WHERE EXCLUDED.remote_data_timestamp IS NULL OR (EXCLUDED.remote_data_timestamp > #{table_name}.remote_data_timestamp)
-        }
-        end
-        result_id           = ActiveRecord::Base.connection.insert_sql(insert_query)
+        result_id = ActiveRecord::Base.connection.insert_sql(
+          build_insert_query(inventory_collection, all_attribute_keys, [hash])
+        )
         inventory_object.id = result_id
       end
     end

app/models/manager_refresh/save_collection/saver/concurrent_safe_batch.rb

@@ -3,8 +3,137 @@ module Saver
     class ConcurrentSafeBatch < ManagerRefresh::SaveCollection::Saver::Base
       private
 
-      def save!(_inventory_collection, _association)
-        raise "saver_strategy :concurent_safe_batch is not implemented"
+      def save!(inventory_collection, association)
+        attributes_index        = {}
+        inventory_objects_index = {}
+        all_attribute_keys      = Set.new
+
+        inventory_collection.each do |inventory_object|
+          attributes = inventory_object.attributes(inventory_collection)
+          index      = inventory_object.manager_uuid
+
+          attributes_index[index]        = attributes
+          inventory_objects_index[index] = inventory_object
+          all_attribute_keys.merge(attributes_index[index].keys)
+        end
+
+        inventory_collection_size = inventory_collection.size
+        deleted_counter           = 0
+        created_counter           = 0
+        updated_counter           = 0
+        _log.info("*************** PROCESSING #{inventory_collection} of size #{inventory_collection_size} *************")
+        hashes_for_update = []
+        records_for_destroy = []
+
+        # Records that are in the DB, we will be updating or deleting them.
+        association.find_in_batches do |batch|
+          batch.each do |record|
+            next unless assert_distinct_relation(record)
+
+            index = inventory_collection.object_index_with_keys(unique_index_keys, record)
+
+            inventory_object = inventory_objects_index.delete(index)
+            hash             = attributes_index.delete(index)
+
+            if inventory_object.nil?
+              # Record was found in the DB but not sent for saving, that means it doesn't exist anymore and we should
+              # delete it from the DB.
+              if inventory_collection.delete_allowed?
+                records_for_destroy << record
+                deleted_counter += 1
+              end
+            else
+              # Record was found in the DB and sent for saving, we will be updating the DB.
+              next unless assert_referential_integrity(hash, inventory_object)
+              inventory_object.id = record.id
+
+              record.assign_attributes(hash.except(:id, :type))
+              if !inventory_collection.check_changed? || record.changed?
+                hashes_for_update << record.attributes.symbolize_keys
+              end
+            end
+          end
+
+          # Update in batches
+          if hashes_for_update.size >= batch_size
+            update_records!(inventory_collection, all_attribute_keys, hashes_for_update)
+            updated_counter += hashes_for_update.count
+
+            hashes_for_update = []
+          end
+
+          # Destroy in batches
+          if records_for_destroy.size >= batch_size
+            destroy_records(records)
+            records_for_destroy = []
+          end
+        end
+
+        # Update the last batch
+        update_records!(inventory_collection, all_attribute_keys, hashes_for_update)
+        updated_counter += hashes_for_update.count
+        hashes_for_update = [] # Cleanup so GC can release it sooner
+
+        # Destroy the last batch
+        destroy_records(records_for_destroy)
+        records_for_destroy = [] # Cleanup so GC can release it sooner
+
+        all_attribute_keys << :type if inventory_collection.supports_sti?
+        # Records that were not found in the DB but sent for saving, we will be creating these in the DB.
+        if inventory_collection.create_allowed?
+          inventory_objects_index.each_slice(batch_size) do |batch|
+            create_records!(inventory_collection, all_attribute_keys, batch, attributes_index)
+            created_counter += batch.size
+          end
+        end
+        _log.info("*************** PROCESSED #{inventory_collection}, created=#{created_counter}, "\
+                  "updated=#{updated_counter}, deleted=#{deleted_counter} *************")
+      end
+
+      def destroy_records(records)
+        # TODO(lsmola) we need at least batch disconnect. Batch destroy won't be probably possible because of the
+        # :dependent => :destroy.
+        ActiveRecord::Base.transaction do
+          records.each do |record|
+            delete_record!(inventory_collection, record)
+          end
+        end
+      end
+
+      def update_records!(inventory_collection, all_attribute_keys, hashes)
+        return if hashes.blank?
+
+        ActiveRecord::Base.connection.execute(build_update_query(inventory_collection, all_attribute_keys, hashes))
+      end
+
+      def create_records!(inventory_collection, all_attribute_keys, batch, attributes_index)
+        indexed_inventory_objects = {}
+        hashes = []
+        batch.each do |index, inventory_object|
+          hash = inventory_collection.model_class.new(attributes_index.delete(index)).attributes.symbolize_keys
+          next unless assert_referential_integrity(hash, inventory_object)
+
+          hashes << hash
+          # Index on Unique Columns values, so we can easily fill in the :id later
+          indexed_inventory_objects[inventory_collection.unique_index_columns.map { |x| hash[x] }] = inventory_object
+        end
+
+        return if hashes.blank?
+
+        ActiveRecord::Base.connection.execute(
+          build_insert_query(inventory_collection, all_attribute_keys, hashes)
+        )
+        # TODO(lsmola) we need to do the mapping only if this IC has dependents/dependees
+        map_ids_to_inventory_objects(inventory_collection, indexed_inventory_objects, hashes)
+      end
+
+      def map_ids_to_inventory_objects(inventory_collection, indexed_inventory_objects, hashes)
+        inventory_collection.model_class.where(
+          build_multi_selection_query(inventory_collection, hashes)
+        ).find_each do |inserted_record|
+          inventory_object = indexed_inventory_objects[inventory_collection.unique_index_columns.map { |x| inserted_record.public_send(x) }]
+          inventory_object.id = inserted_record.id if inventory_object
+        end
       end
     end
   end

app/models/manager_refresh/save_collection/saver/default.rb

@@ -14,7 +14,7 @@ def save!(inventory_collection, association)
           inventory_objects_index[index] = inventory_object
         end
 
-        unique_db_indexes      = Set.new
+        unique_db_indexes = Set.new
 
         inventory_collection_size = inventory_collection.size
         deleted_counter           = 0
@@ -66,12 +66,6 @@ def save!(inventory_collection, association)
                   "updated=#{inventory_collection_size - created_counter}, deleted=#{deleted_counter} *************")
       end
 
-      def delete_record!(inventory_collection, record)
-        return false unless inventory_collection.delete_allowed?
-        record.public_send(inventory_collection.delete_method)
-        true
-      end
-
       def update_record!(inventory_collection, record, hash, inventory_object)
         record.assign_attributes(hash.except(:id, :type))
         record.save if !inventory_collection.check_changed? || record.changed?