Add Services for Default Stock manipulation

app/code/Magento/InventoryCatalog/Api/DefaultSourceProviderInterface.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\InventoryCatalog\Api;
+
+/**
+ * Service returns Default Source Id
+ *
+ * @api
+ */
+interface DefaultSourceProviderInterface
+{
+    /**
+     * Get Default Source id
+     *
+     * @return int
+     */
+    public function getId(): int;
+}

app/code/Magento/InventoryCatalog/Api/DefaultStockProviderInterface.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\InventoryCatalog\Api;
+
+/**
+ * Service returns Default Stock Id
+ *
+ * @api
+ */
+interface DefaultStockProviderInterface
+{
+    /**
+     * Get Default Stock Id
+     *
+     * @return int
+     */
+    public function getId(): int;
+}

app/code/Magento/InventoryCatalog/Model/DefaultSourceProvider.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\InventoryCatalog\Model;
+
+use Magento\InventoryCatalog\Api\DefaultSourceProviderInterface;
+
+/**
+ * Service returns Default Source Id
+ */
+class DefaultSourceProvider implements DefaultSourceProviderInterface
+{
+    /**
+     * @inheritdoc
+     */
+    public function getId(): int
+    {
+        return 1;
+    }
+}

app/code/Magento/InventoryCatalog/Model/DefaultStockProvider.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\InventoryCatalog\Model;
+
+use Magento\InventoryCatalog\Api\DefaultStockProviderInterface;
+
+/**
+ * Service returns Default Stock Id
+ */
+class DefaultStockProvider implements DefaultStockProviderInterface
+{
+    /**
+     * @inheritdoc
+     */
+    public function getId(): int
+    {
+        return 1;
+    }
+}

app/code/Magento/InventoryCatalog/Setup/InstallData.php

@@ -17,6 +17,8 @@
 use Magento\InventoryApi\Api\StockRepositoryInterface;
 use Magento\InventoryApi\Api\AssignSourcesToStockInterface;
 use Magento\Framework\Api\DataObjectHelper;
+use Magento\InventoryCatalog\Api\DefaultSourceProviderInterface;
+use Magento\InventoryCatalog\Api\DefaultStockProviderInterface;
 
 /**
  * Install Default Source, Stock and link them together
@@ -53,28 +55,44 @@ class InstallData implements InstallDataInterface
      */
     private $assignSourcesToStock;
 
+    /**
+     * @var DefaultSourceProviderInterface
+     */
+    private $defaultSourceProvider;
+
+    /**
+     * @var DefaultStockProviderInterface
+     */
+    private $defaultStockProvider;
+
     /**
      * @param SourceRepositoryInterface $sourceRepository
      * @param SourceInterfaceFactory $sourceFactory
      * @param StockRepositoryInterface $stockRepository
      * @param StockInterfaceFactory $stockFactory
      * @param AssignSourcesToStockInterface $assignSourcesToStock
      * @param DataObjectHelper $dataObjectHelper
+     * @param DefaultSourceProviderInterface $defaultSourceProvider
+     * @param DefaultStockProviderInterface $defaultStockProvider
      */
     public function __construct(
         SourceRepositoryInterface $sourceRepository,
         SourceInterfaceFactory $sourceFactory,
         StockRepositoryInterface $stockRepository,
         StockInterfaceFactory $stockFactory,
         AssignSourcesToStockInterface $assignSourcesToStock,
-        DataObjectHelper $dataObjectHelper
+        DataObjectHelper $dataObjectHelper,
+        DefaultSourceProviderInterface $defaultSourceProvider,
+        DefaultStockProviderInterface $defaultStockProvider
     ) {
         $this->sourceRepository = $sourceRepository;
         $this->sourceFactory = $sourceFactory;
         $this->stockRepository = $stockRepository;
         $this->stockFactory = $stockFactory;
         $this->assignSourcesToStock = $assignSourcesToStock;
         $this->dataObjectHelper = $dataObjectHelper;
+        $this->defaultSourceProvider = $defaultSourceProvider;
+        $this->defaultStockProvider = $defaultStockProvider;
     }
 
     /**
@@ -96,7 +114,7 @@ public function install(ModuleDataSetupInterface $setup, ModuleContextInterface
     private function addDefaultSource()
     {
         $data = [
-            SourceInterface::SOURCE_ID => 1,
+            SourceInterface::SOURCE_ID => $this->defaultSourceProvider->getId(),
             SourceInterface::NAME => 'Default Source',
             SourceInterface::ENABLED => 1,
             SourceInterface::DESCRIPTION => 'Default Source',
@@ -119,7 +137,7 @@ private function addDefaultSource()
     private function addDefaultStock()
     {
         $data = [
-            StockInterface::STOCK_ID => 1,
+            StockInterface::STOCK_ID => $this->defaultStockProvider->getId(),
             StockInterface::NAME => 'Default Stock'
         ];
         $source = $this->stockFactory->create();
@@ -134,6 +152,9 @@ private function addDefaultStock()
      */
     private function assignStockToSource()
     {
-        $this->assignSourcesToStock->execute([1], 1);
+        $this->assignSourcesToStock->execute(
+            [$this->defaultSourceProvider->getId()],
+            $this->defaultStockProvider->getId()
+        );
     }
 }

app/code/Magento/InventoryCatalog/etc/di.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <preference for="Magento\InventoryCatalog\Api\DefaultStockResolverInterface" type="Magento\InventoryCatalog\Model\DefaultStockResolver"/>
+    <preference for="Magento\InventoryCatalog\Api\DefaultSourceResolverInterface" type="Magento\InventoryCatalog\Model\DefaultSourceResolver"/>
+</config>