From 2f5a68c8a5a36f916ccd13f3bc8c3c320da3648e Mon Sep 17 00:00:00 2001
From: kingery <kingeryq@gmail.com>
Date: Sun, 20 Mar 2022 20:38:40 +0800
Subject: [PATCH] =?UTF-8?q?feat(LazyFunLoader):=20=E5=A2=9E=E5=8A=A0?=
 =?UTF-8?q?=E9=9D=99=E6=80=81=E5=B7=A5=E5=8E=82=E6=96=B9=E6=B3=95?=
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---
 .../core/lang/loader/LazyFunLoader.java       | 11 ++++++++
 .../core/lang/loader/LazyFunLoaderTest.java   | 28 +++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/loader/LazyFunLoader.java b/hutool-core/src/main/java/cn/hutool/core/lang/loader/LazyFunLoader.java
index e50e80a76..3cc626a6f 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/loader/LazyFunLoader.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/loader/LazyFunLoader.java
@@ -24,6 +24,17 @@ public class LazyFunLoader<T> extends LazyLoader<T> {
 	 */
 	private Supplier<T> supplier;
 
+	/**
+	 * 静态工厂方法，提供语义性与编码便利性
+	 * @param supplier 用于生成对象的函数
+	 * @param <T> 对象类型
+	 * @return 函数式懒加载加载器对象
+	 */
+	public static <T> LazyFunLoader<T> onLoad(final Supplier<T> supplier) {
+		Assert.notNull(supplier, "supplier");
+		return new LazyFunLoader<>(supplier);
+	}
+
 	/**
 	 * 构造
 	 *
diff --git a/hutool-core/src/test/java/cn/hutool/core/lang/loader/LazyFunLoaderTest.java b/hutool-core/src/test/java/cn/hutool/core/lang/loader/LazyFunLoaderTest.java
index 6de9cb529..0e35bf717 100644
--- a/hutool-core/src/test/java/cn/hutool/core/lang/loader/LazyFunLoaderTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/lang/loader/LazyFunLoaderTest.java
@@ -42,4 +42,32 @@ public class LazyFunLoaderTest {
 
 		Assert.assertFalse(loader.isInitialize());
 	}
+
+	@Test
+	public void testOnLoadStaticFactoryMethod1() {
+
+		LazyFunLoader<BigObject> loader = LazyFunLoader.onLoad(BigObject::new);
+
+		Assert.assertNotNull(loader.get());
+		Assert.assertTrue(loader.isInitialize());
+
+		// 对于某些对象，在程序关闭时，需要进行销毁操作
+		loader.ifInitialized(BigObject::destroy);
+
+		Assert.assertTrue(loader.get().isDestroy);
+	}
+
+	@Test
+	public void testOnLoadStaticFactoryMethod2() {
+
+		LazyFunLoader<BigObject> loader = LazyFunLoader.onLoad(BigObject::new);
+
+		// 若从未使用，则可以避免不必要的初始化
+		loader.ifInitialized(it -> {
+
+			Assert.fail();
+			it.destroy();
+		});
+
+	}
 }