| /* |
| * 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.dubbo.common.compiler.support; |
| |
| import org.apache.dubbo.common.compiler.Compiler; |
| |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReentrantLock; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /** |
| * Abstract compiler. (SPI, Prototype, ThreadSafe) |
| */ |
| public abstract class AbstractCompiler implements Compiler { |
| |
| private static final Pattern PACKAGE_PATTERN = Pattern.compile("package\\s+([$_a-zA-Z][$_a-zA-Z0-9\\.]*);"); |
| |
| private static final Pattern CLASS_PATTERN = Pattern.compile("class\\s+([$_a-zA-Z][$_a-zA-Z0-9]*)\\s+"); |
| |
| private static final Map<String, Lock> CLASS_IN_CREATION_MAP = new ConcurrentHashMap<>(); |
| |
| @Override |
| public Class<?> compile(Class<?> neighbor, String code, ClassLoader classLoader) { |
| code = code.trim(); |
| Matcher matcher = PACKAGE_PATTERN.matcher(code); |
| String pkg; |
| if (matcher.find()) { |
| pkg = matcher.group(1); |
| } else { |
| pkg = ""; |
| } |
| matcher = CLASS_PATTERN.matcher(code); |
| String cls; |
| if (matcher.find()) { |
| cls = matcher.group(1); |
| } else { |
| throw new IllegalArgumentException("No such class name in " + code); |
| } |
| String className = pkg != null && pkg.length() > 0 ? pkg + "." + cls : cls; |
| Lock lock = CLASS_IN_CREATION_MAP.get(className); |
| if (lock == null) { |
| CLASS_IN_CREATION_MAP.putIfAbsent(className, new ReentrantLock()); |
| lock = CLASS_IN_CREATION_MAP.get(className); |
| } |
| try { |
| lock.lock(); |
| return Class.forName(className, true, classLoader); |
| } catch (ClassNotFoundException e) { |
| if (!code.endsWith("}")) { |
| throw new IllegalStateException("The java code not endsWith \"}\", code: \n" + code + "\n"); |
| } |
| try { |
| return doCompile(neighbor, classLoader, className, code); |
| } catch (RuntimeException t) { |
| throw t; |
| } catch (Throwable t) { |
| throw new IllegalStateException("Failed to compile class, cause: " + t.getMessage() + ", class: " + className + ", code: \n" + code + "\n, stack: " + ClassUtils.toString(t)); |
| } |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| protected Class<?> doCompile(ClassLoader classLoader, String name, String source) throws Throwable { |
| return null; |
| } |
| |
| protected Class<?> doCompile(Class<?> neighbor,ClassLoader classLoader, String name, String source) throws Throwable { |
| return doCompile(classLoader, name, source); |
| } |
| |
| } |