add SoftConcurrentMap

hutool-core/src/main/java/org/dromara/hutool/core/map/SoftConcurrentMap.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2023 looly(loolly@aliyun.com)
+ * Hutool is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *          http://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+
+package org.dromara.hutool.core.map;
+
+import org.dromara.hutool.core.util.ReferenceUtil;
+
+import java.lang.ref.Reference;
+import java.util.concurrent.ConcurrentMap;
+
+/**
+ * 线程安全的SoftMap实现<br>
+ *
+ * @param <K> 键类型
+ * @param <V> 值类型
+ * @author looly
+ * @since 6.0.0
+ */
+public class SoftConcurrentMap<K, V> extends ReferenceConcurrentMap<K, V> {
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * 构造
+	 */
+	public SoftConcurrentMap() {
+		this(new SafeConcurrentHashMap<>());
+	}
+
+	/**
+	 * 构造
+	 *
+	 * @param raw {@link ConcurrentMap}实现
+	 */
+	public SoftConcurrentMap(final ConcurrentMap<Reference<K>, V> raw) {
+		super(raw, ReferenceUtil.ReferenceType.SOFT);
+	}
+}