core/src/test/java/org/apache/logging/log4j/core/FileConfigTest.java

/*
 * 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.logging.log4j.core;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.XMLConfigurationFactory;
import org.apache.logging.log4j.status.StatusLogger;
import org.apache.logging.log4j.test.appender.ListAppender;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

import java.io.File;
import java.util.Map;

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

/**
 *
 */
public class FileConfigTest {

    private static final String CONFIG = "target/test-classes/log4j-test2.xml";
    private static Configuration config;
    private static ListAppender app;
    private static LoggerContext ctx;

    private final org.apache.logging.log4j.Logger logger = LogManager.getLogger("LoggerTest");

    @BeforeClass
    public static void setupClass() {
        System.setProperty(XMLConfigurationFactory.CONFIGURATION_FILE_PROPERTY, CONFIG);
        ctx = (LoggerContext) LogManager.getContext(false);
    }

    @AfterClass
    public static void cleanupClass() {
        System.clearProperty(XMLConfigurationFactory.CONFIGURATION_FILE_PROPERTY);
        ctx.reconfigure();
        StatusLogger.getLogger().reset();
    }

    @Before
    public void before() {
        config = ctx.getConfiguration();
        for (final Map.Entry<String, Appender> entry : config.getAppenders().entrySet()) {
            if (entry.getKey().equals("List")) {
                app = (ListAppender) entry.getValue();
                break;
            }
        }
        assertNotNull("No Appender", app);
        app.clear();
    }

    @Test
    public void testReconfiguration() throws Exception {
        final File file = new File(CONFIG);
        final long orig = file.lastModified();
        final long newTime = orig + 10000;
        file.setLastModified(newTime);
        Thread.sleep(6000);
        for (int i = 0; i < 17; ++i) {
            logger.debug("Reconfigure");
        }
        final Configuration cfg = ctx.getConfiguration();
        assertNotNull("No configuration", cfg);
        assertTrue("Reconfiguration failed", cfg != config);
    }
}