| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.sling.uca.impl; |
| |
| import java.lang.instrument.ClassFileTransformer; |
| import java.lang.instrument.IllegalClassFormatException; |
| import java.security.ProtectionDomain; |
| |
| import javassist.ClassPool; |
| import javassist.CtClass; |
| import javassist.CtConstructor; |
| import javassist.CtField; |
| import javassist.bytecode.Descriptor; |
| |
| /** |
| * Support class for transformers that update the timeout fields in the default constructor |
| */ |
| public abstract class UpdateFieldsInConstructorTimeoutTransformer implements ClassFileTransformer { |
| |
| private final String className; |
| private final String connectTimeoutFieldName; |
| private final String readTimeoutFieldName; |
| private final long connectTimeoutMillis; |
| private final long readTimeoutMillis; |
| |
| public UpdateFieldsInConstructorTimeoutTransformer(String className, String connectTimeoutFieldName, |
| String readTimeoutFieldName, long connectTimeoutMillis, long readTimeoutMillis) { |
| |
| this.className = className; |
| this.connectTimeoutFieldName = connectTimeoutFieldName; |
| this.readTimeoutFieldName = readTimeoutFieldName; |
| this.connectTimeoutMillis = connectTimeoutMillis; |
| this.readTimeoutMillis = readTimeoutMillis; |
| } |
| |
| @Override |
| public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, |
| ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException { |
| try { |
| if ( this.className.equals(className) ) { |
| Log.get().log("%s asked to transform %s", getClass().getSimpleName(), className); |
| |
| ClassPool defaultPool = ClassPool.getDefault(); |
| CtClass cc = defaultPool.get(Descriptor.toJavaName(className)); |
| |
| CtConstructor noArgCtor = cc.getConstructor(Descriptor.ofConstructor(new CtClass[0])); |
| CtField connectTimeout = cc.getDeclaredField(connectTimeoutFieldName); |
| CtField readTimeout = cc.getDeclaredField(readTimeoutFieldName); |
| noArgCtor.insertAfter("this." + connectTimeout.getName() + " = " + connectTimeoutMillis + ";"); |
| noArgCtor.insertAfter("this." + readTimeout.getName() + " = " + readTimeoutMillis + ";"); |
| |
| classfileBuffer = cc.toBytecode(); |
| cc.detach(); |
| Log.get().log("Transformation complete."); |
| } |
| return classfileBuffer; |
| } catch (Exception e) { |
| Log.get().fatal("Transformation failed", e); |
| return null; |
| } |
| } |
| } |