Feature/bael 5653 microstream (#12660)

* BAEL-5653: Microstream storage * BAEL-5653: Eager loading * BAEL-5653: Lazy loading * BAEL-5653: Temp dir * BAEL-5653: Refactoring * BAEL-5653: Refactoring * BAEL-5653: Refactoring * BAEL-5653: PR comments
2022-09-22 19:53:16 +02:00
parent be5b79756b
commit 8993a3064b
8 changed files with 298 additions and 0 deletions
@@ -0,0 +1,83 @@
+package com.baeldung.microstream;
+
+import one.microstream.storage.embedded.types.EmbeddedStorageManager;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.assertj.core.api.Assertions.*;
+
+class StorageManagerUnitTest {
+
+    private static final Author AUTHOR = new Author("Joanne", "Rowling");
+    private static final Book BOOK_ONE = new Book("Harry Potter and the Philosopher's Stone", AUTHOR, 1997);
+    private static final Book BOOK_TWO = new Book("Harry Potter and the Chamber of Secrets", AUTHOR, 1998);
+
+    @Test
+    void givenStorageWithStringAsRoot_whenFetchingRoot_thenExpectedStringIsReturned(@TempDir Path tempDir) {
+        EmbeddedStorageManager storageManager = StorageManager.initializeStorageWithStringAsRoot(tempDir, "baeldung-demo-1");
+        assertThat(storageManager.root()).isEqualTo("baeldung-demo-1");
+        storageManager.shutdown();
+    }
+
+    @Test
+    void givenStorageWithCustomTypeAsRoot_whenFetchingRoot_thenCustomTypeWithExpectedValuesIsReturned(@TempDir Path tempDir) {
+        EmbeddedStorageManager storageManager = StorageManager.initializeStorageWithCustomTypeAsRoot(tempDir, "baeldung-demo-2");
+        RootInstance rootInstance = (RootInstance) storageManager.root();
+        assertThat(rootInstance.getName()).isEqualTo("baeldung-demo-2");
+        assertThat(rootInstance.getBooks()).isEmpty();
+        storageManager.shutdown();
+    }
+
+    @Test
+    void givenStorageWithAdditionalObjects_whenLoadingRoot_thenAdditionalObjectsAreSuccessfullyStored(@TempDir Path tempDir) {
+        EmbeddedStorageManager storageManager = StorageManager.initializeStorageWithCustomTypeAsRoot(tempDir, "baeldung-demo-3", Arrays.asList(BOOK_ONE, BOOK_TWO));
+        RootInstance rootInstance = (RootInstance) storageManager.root();
+        assertThat(rootInstance.getName()).isEqualTo("baeldung-demo-3");
+        assertThat(rootInstance.getBooks()).hasSize(2);
+        assertThat(rootInstance.getBooks().get(0)).isEqualTo(BOOK_ONE);
+        assertThat(rootInstance.getBooks().get(1)).isEqualTo(BOOK_TWO);
+        storageManager.shutdown();
+    }
+
+    @Test
+    void givenStorageWithAdditionalObjects_whenLazyLoadingRoot_thenAdditionalObjectsAreSuccessfullyStored(@TempDir Path tempDir) {
+        EmbeddedStorageManager storageManager = StorageManager.lazyLoadOrCreateStorageWithCustomTypeAsRoot(tempDir, "baeldung-demo-4", Arrays.asList(BOOK_ONE, BOOK_TWO));
+        RootInstanceLazy rootInstance = (RootInstanceLazy) storageManager.root();
+        assertThat(rootInstance.getName()).isEqualTo("baeldung-demo-4");
+        assertThat(rootInstance.getBooks()).hasSize(2);
+        assertThat(rootInstance.getBooks().get(0)).isEqualTo(BOOK_ONE);
+        assertThat(rootInstance.getBooks().get(1)).isEqualTo(BOOK_TWO);
+        storageManager.shutdown();
+    }
+
+    @Test
+    void givenStorageWithAdditionalObjects_whenRemovingObjectsFromGraph_thenObjectsAreSuccessfullyRemoved(@TempDir Path tempDir) {
+        EmbeddedStorageManager storageManager = StorageManager.lazyLoadOrCreateStorageWithCustomTypeAsRoot(tempDir, "baeldung-demo-5", Arrays.asList(BOOK_ONE, BOOK_TWO));
+        RootInstanceLazy rootInstance = (RootInstanceLazy) storageManager.root();
+        List<Book> books = rootInstance.getBooks();
+        books.remove(1);
+        storageManager.store(books);
+        assertThat(rootInstance.getName()).isEqualTo("baeldung-demo-5");
+        assertThat(books).hasSize(1);
+        storageManager.shutdown();
+    }
+
+    @Test
+    void givenStorageWithAdditionalObjects_whenFilteringCollectionFromGraph_thenStreamsCanBeUsed(@TempDir Path tempDir) {
+        EmbeddedStorageManager storageManager = StorageManager.lazyLoadOrCreateStorageWithCustomTypeAsRoot(tempDir, "baeldung-demo-6", Arrays.asList(BOOK_ONE, BOOK_TWO));
+        RootInstanceLazy rootInstance = (RootInstanceLazy) storageManager.root();
+        List<Book> booksFrom1998 = rootInstance.getBooks().stream()
+          .filter(book -> book.getYear() == 1998)
+          .collect(Collectors.toList());
+        assertThat(rootInstance.getName()).isEqualTo("baeldung-demo-6");
+        assertThat(booksFrom1998).hasSize(1);
+        assertThat(booksFrom1998.get(0).getYear()).isEqualTo(1998);
+        storageManager.shutdown();
+    }
+
+}