log4j-core/src/test/java/org/apache/logging/log4j/core/LoggerUpdateTest.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.
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package org.apache.logging.log4j.core;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.LoggerConfig;
import org.apache.logging.log4j.core.junit.Named;
import org.apache.logging.log4j.core.junit.LoggerContextSource;
import org.apache.logging.log4j.test.appender.ListAppender;
import org.junit.jupiter.api.Test;

import java.util.List;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertSame;

@LoggerContextSource("log4j-test2.xml")
public class LoggerUpdateTest {

    private final ListAppender app;

    public LoggerUpdateTest(@Named("List") final ListAppender app) {
        this.app = app.clear();
    }

    @Test
    public void resetLevel(final LoggerContext context) {
        final org.apache.logging.log4j.Logger logger = context.getLogger("com.apache.test");
        logger.traceEntry();
        List<LogEvent> events = app.getEvents();
        assertEquals(1, events.size(), "Incorrect number of events. Expected 1, actual " + events.size());
        app.clear();
        final LoggerContext ctx = LoggerContext.getContext(false);
        final Configuration config = ctx.getConfiguration();
        final LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
        /* You could also specify the actual logger name as below and it will return the LoggerConfig used by the Logger.
           LoggerConfig loggerConfig = getLoggerConfig("com.apache.test");
        */
        loggerConfig.setLevel(Level.DEBUG);
        ctx.updateLoggers();  // This causes all Loggers to refetch information from their LoggerConfig.
        logger.traceEntry();
        events = app.getEvents();
        assertEquals(0, events.size(), "Incorrect number of events. Expected 0, actual " + events.size());
    }

    @Test
    public void testUpdateLoggersPropertyListeners(final LoggerContext context) throws Exception {
        context.addPropertyChangeListener(evt -> {
            assertEquals(LoggerContext.PROPERTY_CONFIG, evt.getPropertyName());
            assertSame(context, evt.getSource());
        });
        context.updateLoggers();
    }
}