| /* |
| * 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.drill.exec.compile; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import org.apache.drill.common.config.DrillConfig; |
| import org.apache.drill.exec.compile.ClassTransformer.ClassNames; |
| import org.apache.drill.exec.exception.ClassTransformationException; |
| import org.apache.drill.exec.server.options.OptionSet; |
| import org.codehaus.commons.compiler.CompileException; |
| |
| import com.google.common.collect.MapMaker; |
| |
| /** |
| * Per-compilation unit class loader that holds both caching and compilation |
| * steps. */ |
| |
| public class QueryClassLoader extends URLClassLoader { |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(QueryClassLoader.class); |
| |
| private ClassCompilerSelector compilerSelector; |
| |
| private AtomicLong index = new AtomicLong(0); |
| |
| private ConcurrentMap<String, byte[]> customClasses = new MapMaker().concurrencyLevel(4).makeMap(); |
| |
| public QueryClassLoader(DrillConfig config, OptionSet sessionOptions) { |
| super(new URL[0], Thread.currentThread().getContextClassLoader()); |
| compilerSelector = new ClassCompilerSelector(this, config, sessionOptions); |
| } |
| |
| public long getNextClassIndex() { |
| return index.getAndIncrement(); |
| } |
| |
| public void injectByteCode(String className, byte[] classBytes) throws IOException { |
| if (customClasses.containsKey(className)) { |
| throw new IOException(String.format("The class defined %s has already been loaded.", className)); |
| } |
| customClasses.put(className, classBytes); |
| |
| // Uncomment the following to save the generated byte codes. |
| // Use the JDK javap command to view the generated code. |
| // This is the code after byte code manipulations. See |
| // ClassCompilerSelector for a similar block to view the byte |
| // codes before manipulation. |
| |
| // final File baseDir = new File( new File( System.getProperty("java.io.tmpdir") ), "classes" ); |
| // String path = className.replace( '.', '/' ); |
| // File classFile = new File( baseDir, path + ".class" ); |
| // classFile.getParentFile().mkdirs(); |
| // try (BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(classFile))) { |
| // out.write(classBytes); |
| // } |
| // System.out.println( "Classes saved to: " + baseDir.getAbsolutePath() ); |
| } |
| |
| @Override |
| protected Class<?> findClass(String className) throws ClassNotFoundException { |
| byte[] ba = customClasses.get(className); |
| if (ba != null) { |
| return this.defineClass(className, ba, 0, ba.length); |
| }else{ |
| return super.findClass(className); |
| } |
| } |
| |
| public byte[][] getClassByteCode(final ClassNames className, final String sourceCode) |
| throws CompileException, IOException, ClassNotFoundException, ClassTransformationException { |
| return compilerSelector.getClassByteCode(className, sourceCode); |
| } |
| |
| } |