Remove the Codahale shiim
Brett Wooldridge
10 years ago
parent
e67a6c2259
commit
778ff0650f
@ -1,92 +0,0 @@
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/*
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* Copyright (C) 2013 Brett Wooldridge
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.zaxxer.hikari.metrics;
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import javassist.CannotCompileException;
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import javassist.ClassPool;
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import javassist.CtClass;
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import javassist.CtConstructor;
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import javassist.LoaderClassPath;
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import javassist.Modifier;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* This class is used to validate that Codahale metrics is available in the class
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* path, or if not to generate a fake "shim" that avoids ClassNotFound exceptions
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* in code that depends on (but does not use if not present) Codahale metrics.
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*
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* @author Brett Wooldridge
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*/
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public class CodaHaleShim
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{
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private static final Logger LOGGER = LoggerFactory.getLogger(CodaHaleShim.class);
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private CodaHaleShim()
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{
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// empty
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}
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/**
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* Simply invoking this method causes the initialization of this class. All work
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* by this class is performed in static initialization.
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*/
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public static void initialize()
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{
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CodaHaleShim codaHaleShim = new CodaHaleShim();
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codaHaleShim.loadOrShimCodahale();
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}
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/**
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*
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*/
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private void loadOrShimCodahale()
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{
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ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
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try {
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CodaHaleShim.class.getClassLoader().loadClass("com.codahale.metrics.MetricRegistry");
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}
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catch (ClassNotFoundException e) {
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// OK, it is not present, we have to generate a shim
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LOGGER.debug("com.codahale.metrics.MetricRegistry not found, generating stub");
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ClassPool classPool = new ClassPool();
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classPool.appendClassPath(new LoaderClassPath(this.getClass().getClassLoader()));
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try {
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CtClass targetCt = classPool.makeClass("com.codahale.metrics.MetricRegistry");
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targetCt.setModifiers(Modifier.PUBLIC | Modifier.FINAL);
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CtConstructor constructorCt = new CtConstructor(null, targetCt);
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constructorCt.setModifiers(Modifier.PUBLIC);
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constructorCt.setBody("{ throw new RuntimeException(\"HikariCP Codahale shim says: Codahale metrics library is required but was not found in the classpath\"); }");
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targetCt.addConstructor(constructorCt);
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targetCt.toClass(classPool.getClassLoader(), getClass().getProtectionDomain());
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}
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catch (CannotCompileException cce) {
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LOGGER.error("Cannot generate CodaHale metrics shim", cce);
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throw new RuntimeException(cce);
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}
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}
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finally {
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Thread.currentThread().setContextClassLoader(contextClassLoader);
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}
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}
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}
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