Zj/spring custom initializer 1024

docs/modules/misc/pages/integrations/spring-boot.adoc

@@ -288,3 +288,26 @@ and click connect.
 If you are using Spring Dev Tools, it is recommended to exclude the {product-name} classes from the classpath. Spring Dev Tools use their own restart classloader, which dynamically reloads classes. This can cause issues with the {product-name} classes, as they are not designed to be reloaded on the fly.
 
 Spring documentation: https://docs.spring.io/spring-boot/reference/using/devtools.html
+
+== Code Configuration Before Storage Creation
+
+There are some use cases where it is necessary to configure the storage's context before it is created. For this purpose, you can use the `StorageContextInitializer` to create a custom storage configuration in your application.
+
+Example for configuring `LazyReferenceManager`:
+
+[source,java]
+----
+@Component
+public class StorageContextInitializerImpl implements StorageContextInitializer
+{
+    @Override
+    public void initialize()
+    {
+        LazyReferenceManager.set(LazyReferenceManager.New(
+                Lazy.Checker(
+                        1_000_000, // timeout of lazy access
+                        0.75       // memory quota
+                )));
+    }
+}
+----

examples/spring-boot3-simple/src/main/java/org/microstream/spring/boot/example/simple/initializer/StorageContextInitializerImpl.java

@@ -0,0 +1,38 @@
+package org.microstream.spring.boot.example.simple.initializer;
+
+/*-
+ * #%L
+ * EclipseStore Integrations SpringBoot
+ * %%
+ * Copyright (C) 2023 - 2024 MicroStream Software
+ * %%
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ * #L%
+ */
+
+import org.eclipse.serializer.reference.Lazy;
+import org.eclipse.serializer.reference.LazyReferenceManager;
+import org.eclipse.store.integrations.spring.boot.types.initializers.StorageContextInitializer;
+import org.springframework.stereotype.Component;
+
+/**
+ * This class is for demonstration purposes only. It shows how to execute code before storage is initialized.
+ * <a href="https://docs.eclipsestore.io/manual/storage/loading-data/lazy-loading/clearing-lazy-references.html">...</a>
+ */
+@Component
+public class StorageContextInitializerImpl implements StorageContextInitializer
+{
+    @Override
+    public void initialize()
+    {
+        LazyReferenceManager.set(LazyReferenceManager.New(
+                Lazy.Checker(
+                        1_000_000, // timeout of lazy access
+                        0.75                       // memory quota
+                )));
+    }
+}

integrations/spring-boot3/src/main/java/org/eclipse/store/integrations/spring/boot/types/factories/EmbeddedStorageFoundationFactory.java

@@ -21,9 +21,14 @@
 import org.eclipse.store.integrations.spring.boot.types.configuration.ConfigurationPair;
 import org.eclipse.store.integrations.spring.boot.types.configuration.EclipseStoreProperties;
 import org.eclipse.store.integrations.spring.boot.types.converter.EclipseStoreConfigConverter;
+import org.eclipse.store.integrations.spring.boot.types.initializers.StorageContextInitializer;
 import org.eclipse.store.storage.embedded.configuration.types.EmbeddedStorageConfigurationBuilder;
 import org.eclipse.store.storage.embedded.types.EmbeddedStorageFoundation;
 import org.slf4j.Logger;
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
 
 import java.util.Map;
 
@@ -34,10 +39,11 @@
  *
  * @since 1.2.0
  */
-public class EmbeddedStorageFoundationFactory
+public class EmbeddedStorageFoundationFactory implements ApplicationContextAware
 {
     private final EclipseStoreConfigConverter converter;
     private final ClassLoaderProvider classLoaderProvider;
+    private ApplicationContext applicationContext;
 
     private final Logger logger = Logging.getLogger(EmbeddedStorageFoundationFactory.class);
 
@@ -47,6 +53,7 @@ public EmbeddedStorageFoundationFactory(final EclipseStoreConfigConverter conver
         this.classLoaderProvider = classLoaderProvider;
     }
 
+
     /**
      * Creates an {@code EmbeddedStorageFoundation} using the provided configuration. This method should be called when the additional configuration for the foundation is required.
      *
@@ -56,6 +63,14 @@ public EmbeddedStorageFoundationFactory(final EclipseStoreConfigConverter conver
      */
     public EmbeddedStorageFoundation<?> createStorageFoundation(final EclipseStoreProperties eclipseStoreProperties, final ConfigurationPair... additionalConfiguration)
     {
+        // Call custom code if available
+        try {
+            StorageContextInitializer storageContextInitializer = applicationContext.getBean(StorageContextInitializer.class);
+            storageContextInitializer.initialize();
+        } catch (NoSuchBeanDefinitionException e) {
+            this.logger.debug("No custom storage initializer found.");
+        }
+
         final EmbeddedStorageConfigurationBuilder builder = EmbeddedStorageConfigurationBuilder.New();
         final Map<String, String> valueMap = this.converter.convertConfigurationToMap(eclipseStoreProperties);
         for (final ConfigurationPair pair : additionalConfiguration)
@@ -116,4 +131,9 @@ protected Object createNewRootInstance(final EclipseStoreProperties properties)
         }
     }
 
+    @Override
+    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException
+    {
+        this.applicationContext = applicationContext;
+    }
 }

integrations/spring-boot3/src/main/java/org/eclipse/store/integrations/spring/boot/types/initializers/StorageContextInitializer.java

@@ -0,0 +1,29 @@
+package org.eclipse.store.integrations.spring.boot.types.initializers;
+
+/*-
+ * #%L
+ * EclipseStore Integrations SpringBoot
+ * %%
+ * Copyright (C) 2023 - 2024 MicroStream Software
+ * %%
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ * #L%
+ */
+
+/**
+ * Interface for storage context initializers.
+ * Implementations of this interface can provide custom initialization logic
+ * that will be executed before the creation of the storage foundation.
+ */
+public interface StorageContextInitializer
+{
+    /**
+     * Method to be implemented with custom initialization logic.
+     * This method will be called immediately before the storage foundation creation process.
+     */
+    void initialize();
+}