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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.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 org.apache.drill.shaded.guava.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);
}
}
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