CglibProxyFactory 之中的缓存代码抽取到 InterceptorCache

src/main/java/com/jfinal/ext/proxy/InterceptorCache.java

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+/**
+ * Copyright (c) 2011-2023, James Zhan 詹波 (jfinal@126.com).
+ *
+ * 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
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.jfinal.ext.proxy;
+
+import java.lang.reflect.Method;
+import java.util.Map;
+import java.util.Objects;
+import com.jfinal.aop.Interceptor;
+import com.jfinal.kit.HashKit;
+import com.jfinal.kit.SyncWriteMap;
+
+/**
+ * InterceptorCache 缓存组装好的拦截器
+ */
+public class InterceptorCache {
+
+    private static final Map<MethodKey, Interceptor[]> cache = new SyncWriteMap<>(2048, 0.25F);
+    
+    public static void put(MethodKey methodKey, Interceptor[] inters) {
+        Objects.requireNonNull(methodKey, "methodKey can not be null");
+        Objects.requireNonNull(inters, "inters can not be null");
+        
+        cache.putIfAbsent(methodKey, inters);
+    }
+    
+    public static Interceptor[] get(MethodKey methodKey) {
+        return cache.get(methodKey);
+    }
+    
+    public static MethodKey getMethodKey(Class<?> target, Method method) {
+        long paraHash = HashKit.FNV_OFFSET_BASIS_64;
+        Class<?>[] paraTypes = method.getParameterTypes();
+        for (Class<?> pt : paraTypes) {
+            paraHash ^= pt.getName().hashCode();
+            paraHash *= HashKit.FNV_PRIME_64;
+        }
+        
+        return new MethodKey(target.getName().hashCode(), method.getName().hashCode(), paraHash);
+    }
+    
+    static class MethodKey {
+        final int classHash;
+        final int methodHash;
+        final long paraHash;
+        
+        MethodKey(int classHash, int methodHash, long paraHash) {
+            this.classHash = classHash;
+            this.methodHash = methodHash;
+            this.paraHash = paraHash;
+        }
+        
+        public int hashCode() {
+            return classHash ^ methodHash ^ ((int)paraHash);
+        }
+        
+        /**
+         * 通过比较三部分 hash 值，避免超大规模场景下可能的 key 值碰撞
+         * 
+         * 不必判断 if (methodKey instanceof MethodKey)，因为所有 key 类型必须要相同
+         * 不必判断 if (this == methodKey)，因为每次用于取值的 methodKey 都是新建的
+         */
+        public boolean equals(Object methodKey) {
+            MethodKey mk = (MethodKey)methodKey;
+            return classHash == mk.classHash && methodHash == mk.methodHash && paraHash == mk.paraHash;
+        }
+        
+        public String toString() {
+            return "classHash = " + classHash + "\nmethodHash = " + methodHash + "\nparaHash = " + paraHash;
+        }
+    }
+}
+
+
+
+
+