org.apache.aurora.scheduler.app.Log4jConfigurator.java Source code

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Here is the source code for org.apache.aurora.scheduler.app.Log4jConfigurator.java

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/**
 * Copyright 2013 Apache Software Foundation
 *
 * 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.apache.aurora.scheduler.app;

import com.google.common.base.Preconditions;
import com.twitter.common.logging.RootLogConfig;
import com.twitter.common.logging.RootLogConfig.Configuration;
import com.twitter.common.logging.log4j.GlogLayout;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;

/**
 * Configures log4j logging.
 */
final class Log4jConfigurator {
    private static final java.util.logging.Logger LOG = java.util.logging.Logger
            .getLogger(Log4jConfigurator.class.getName());

    /**
     * Configures log4j to log to stderr with a glog format.
     *
     * @param glogConfig The glog configuration in effect.
     */
    static void configureConsole(Configuration glogConfig) {
        Preconditions.checkNotNull(glogConfig);

        BasicConfigurator.configure(new ConsoleAppender(new GlogLayout(), ConsoleAppender.SYSTEM_ERR));
        Logger.getRootLogger().setLevel(getLevel(glogConfig));
    }

    private static Level getLevel(RootLogConfig.Configuration logConfig) {
        switch (logConfig.getVlog()) {
        case FINEST: // fall through
        case FINER: // fall through
        case FINE: // fall through
        case CONFIG:
            return Level.TRACE;
        case INFO:
            return Level.INFO;
        case WARNING:
            return Level.WARN;
        case SEVERE:
            return Level.ERROR;
        default:
            LOG.warning("Mapping unexpected vlog value of " + logConfig.getVlog() + " to log4j TRACE");
            return Level.TRACE;
        }
    }

    private Log4jConfigurator() {
        // Utility class.
    }
}