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Java example source code file (SubstitutableLoggerTest.java)

This example Java source code file (SubstitutableLoggerTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, class, following, hashset, illegalaccessexception, list, logger, loggerinvocationhandler, method, object, reflection, set, string, substitutelogger, test, util

The SubstitutableLoggerTest.java Java example source code

/**
 * Copyright (c) 2004-2011 QOS.ch
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package org.slf4j.helpers;

import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.event.EventRecodingLogger;
import org.slf4j.helpers.SubstituteLogger;

/**
 * @author Chetan Mehrotra
 */
public class SubstitutableLoggerTest {
    private static final Set<String> EXCLUDED_METHODS = new HashSet(Arrays.asList("getName"));

    @Test
    public void testDelegate() throws Exception {
        SubstituteLogger log = new SubstituteLogger("foo", null, false);
        assertTrue(log.delegate() instanceof EventRecodingLogger);

        Set<String> expectedMethodSignatures = determineMethodSignatures(Logger.class);
        LoggerInvocationHandler ih = new LoggerInvocationHandler();
        Logger proxyLogger = (Logger) Proxy.newProxyInstance(getClass().getClassLoader(), new Class[] { Logger.class }, ih);
        log.setDelegate(proxyLogger);

        invokeMethods(log);

        // Assert that all methods are delegated
        expectedMethodSignatures.removeAll(ih.getInvokedMethodSignatures());
        if (!expectedMethodSignatures.isEmpty()) {
            fail("Following methods are not delegated " + expectedMethodSignatures.toString());
        }
    }

    private void invokeMethods(Logger proxyLogger) throws InvocationTargetException, IllegalAccessException {
        for (Method m : Logger.class.getDeclaredMethods()) {
            if (!EXCLUDED_METHODS.contains(m.getName())) {
                m.invoke(proxyLogger, new Object[m.getParameterTypes().length]);
            }
        }
    }

    private class LoggerInvocationHandler implements InvocationHandler {
        private final Set<String> invokedMethodSignatures = new HashSet();

        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            invokedMethodSignatures.add(getMethodSignature(method));
            if (method.getName().startsWith("is")) {
                return true;
            }
            return null;
        }

        public Set<String> getInvokedMethodSignatures() {
            return invokedMethodSignatures;
        }
    }

    private static Set<String> determineMethodSignatures(Class loggerClass) {
        Set<String> methodSignatures = new HashSet();
        for (Method m : loggerClass.getDeclaredMethods()) {
            if (!EXCLUDED_METHODS.contains(m.getName())) {
                methodSignatures.add(getMethodSignature(m));
            }
        }
        return methodSignatures;
    }

    private static String getMethodSignature(Method m) {
        List<String> result = new ArrayList();
        result.add(m.getName());
        for (Class<?> clazz : m.getParameterTypes()) {
            result.add(clazz.getSimpleName());
        }
        return result.toString();
    }
}

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