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Glowroot Agent
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/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed 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.glowroot.agent.init;

import java.io.File;

import org.glowroot.agent.shaded.qos.logback.classic.LoggerContext;
import org.glowroot.agent.shaded.qos.logback.classic.joran.JoranConfigurator;
import org.glowroot.agent.shaded.qos.logback.core.joran.spi.JoranException;
import org.glowroot.agent.shaded.qos.logback.core.util.StatusPrinter;
import org.glowroot.agent.shaded.google.common.io.Resources;
import org.glowroot.agent.shaded.slf4j.Logger;
import org.glowroot.agent.shaded.slf4j.LoggerFactory;

import org.glowroot.common.util.OnlyUsedByTests;

public class LoggingInit {

    private static final Logger logger = LoggerFactory.getLogger(LoggingInit.class);

    private LoggingInit() {}

    public static void initStaticLoggerState(File baseDir) {
        if (shouldOverrideLogging()) {
            overrideLogging(baseDir);
        }
    }

    public static boolean shouldOverrideLogging() {
        // don't override glowroot.logback-test.xml
        return isShaded() && ClassLoader.getSystemResource("glowroot.logback-test.xml") == null;
    }

    @OnlyUsedByTests
    public static void close() {
        if (shouldOverrideLogging()) {
            ((LoggerContext) LoggerFactory.getILoggerFactory()).reset();
        }
    }

    private static void overrideLogging(File baseDir) {
        LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
        try {
            JoranConfigurator configurator = new JoranConfigurator();
            configurator.setContext(context);
            context.reset();
            context.putProperty("glowroot.base.dir", baseDir.getPath());
            File logbackXmlFile = new File(baseDir, "glowroot.logback.xml");
            if (logbackXmlFile.exists()) {
                configurator.doConfigure(logbackXmlFile);
            } else {
                configurator.doConfigure(Resources.getResource("glowroot.logback.xml"));
            }
        } catch (JoranException je) {
            // any errors are printed below by StatusPrinter
        }
        StatusPrinter.printInCaseOfErrorsOrWarnings(context);
    }

    private static boolean isShaded() {
        try {
            Class.forName("org.glowroot.agent.shaded.slf4j.Logger");
            return true;
        } catch (ClassNotFoundException e) {
            // log exception at trace level
            logger.trace(e.getMessage(), e);
            return false;
        }
    }
}