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/*
* 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 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);
}
}