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agents-flex-core/src/main/java/com/agentsflex/core/util/MapUtil.java

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+/*
+ *  Copyright (c) 2023-2025, Agents-Flex (fuhai999@gmail.com).
+ *  <p>
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *  <p>
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *  <p>
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package com.agentsflex.core.util;
+
+import java.util.Map;
+import java.util.function.Function;
+
+public class MapUtil {
+    private static final boolean IS_JDK8 = (8 == getJvmVersion0());
+
+    private MapUtil() {
+    }
+
+    private static String tryTrim(String string) {
+        return string != null ? string.trim() : "";
+    }
+
+    private static int getJvmVersion0() {
+        int jvmVersion = -1;
+        try {
+            String javaSpecVer = tryTrim(System.getProperty("java.specification.version"));
+            if (StringUtil.hasText(javaSpecVer)) {
+                if (javaSpecVer.startsWith("1.")) {
+                    javaSpecVer = javaSpecVer.substring(2);
+                }
+                if (javaSpecVer.indexOf('.') == -1) {
+                    jvmVersion = Integer.parseInt(javaSpecVer);
+                }
+            }
+        } catch (Throwable ignore) {
+            // ignore
+        }
+        // default is jdk8
+        if (jvmVersion == -1) {
+            jvmVersion = 8;
+        }
+        return jvmVersion;
+    }
+
+    /**
+     * A temporary workaround for Java 8 specific performance issue JDK-8161372 .<br>
+     * This class should be removed once we drop Java 8 support.
+     *
+     * @see <a href=
+     * "https://bugs.openjdk.java.net/browse/JDK-8161372">https://bugs.openjdk.java.net/browse/JDK-8161372</a>
+     */
+    public static <K, V> V computeIfAbsent(Map<K, V> map, K key, Function<K, V> mappingFunction) {
+        if (IS_JDK8) {
+            V value = map.get(key);
+            if (value != null) {
+                return value;
+            }
+        }
+        return map.computeIfAbsent(key, mappingFunction);
+    }
+
+}