/**
* 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.util;
import java.lang.reflect.Modifier;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtConstructor;
import javassist.CtMethod;
import javassist.CtNewMethod;
public class GuavaPatcher {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(GuavaPatcher.class);
private static boolean patched;
public static synchronized void patch() {
if (!patched) {
try {
patchStopwatch();
patchCloseables();
patched = true;
} catch (Throwable e) {
logger.warn("Unable to patch Guava classes.", e);
}
}
}
/**
* Makes Guava stopwatch look like the old version for compatibility with hbase-server (for test purposes).
*/
private static void patchStopwatch() throws Exception {
ClassPool cp = ClassPool.getDefault();
CtClass cc = cp.get("com.google.common.base.Stopwatch");
// Expose the constructor for Stopwatch for old libraries who use the pattern new Stopwatch().start().
for (CtConstructor c : cc.getConstructors()) {
if (!Modifier.isStatic(c.getModifiers())) {
c.setModifiers(Modifier.PUBLIC);
}
}
// Add back the Stopwatch.elapsedMillis() method for old consumers.
CtMethod newmethod = CtNewMethod.make(
"public long elapsedMillis() { return elapsed(java.util.concurrent.TimeUnit.MILLISECONDS); }", cc);
cc.addMethod(newmethod);
// Load the modified class instead of the original.
cc.toClass();
logger.info("Google's Stopwatch patched for old HBase Guava version.");
}
private static void patchCloseables() throws Exception {
ClassPool cp = ClassPool.getDefault();
CtClass cc = cp.get("com.google.common.io.Closeables");
// Add back the Closeables.closeQuietly() method for old consumers.
CtMethod newmethod = CtNewMethod.make(
"public static void closeQuietly(java.io.Closeable closeable) { try{closeable.close();}catch(Exception e){} }",
cc);
cc.addMethod(newmethod);
// Load the modified class instead of the original.
cc.toClass();
logger.info("Google's Closeables patched for old HBase Guava version.");
}
}