org.springframework.cloud.logging.LoggingRebinder.java Source code

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Here is the source code for org.springframework.cloud.logging.LoggingRebinder.java

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/*
 * Copyright 2013-2014 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.springframework.cloud.logging;

import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.bind.RelaxedPropertyResolver;
import org.springframework.boot.logging.LogLevel;
import org.springframework.boot.logging.LoggingSystem;
import org.springframework.cloud.context.environment.EnvironmentChangeEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.EnvironmentAware;
import org.springframework.core.env.Environment;

/**
 * Listener that looks for {@link EnvironmentChangeEvent} and rebinds logger levels if any
 * changed.
 *
 * @author Dave Syer
 *
 */
public class LoggingRebinder implements ApplicationListener<EnvironmentChangeEvent>, EnvironmentAware {

    private final Log logger = LogFactory.getLog(getClass());

    private Environment environment;

    @Override
    public void setEnvironment(Environment environment) {
        this.environment = environment;
    }

    @Override
    public void onApplicationEvent(EnvironmentChangeEvent event) {
        if (this.environment == null) {
            return;
        }
        LoggingSystem system = LoggingSystem.get(LoggingSystem.class.getClassLoader());
        setLogLevels(system, this.environment);
    }

    protected void setLogLevels(LoggingSystem system, Environment environment) {
        Map<String, Object> levels = new RelaxedPropertyResolver(environment).getSubProperties("logging.level.");
        for (Entry<String, Object> entry : levels.entrySet()) {
            setLogLevel(system, environment, entry.getKey(), entry.getValue().toString());
        }
    }

    private void setLogLevel(LoggingSystem system, Environment environment, String name, String level) {
        try {
            if (name.equalsIgnoreCase("root")) {
                name = null;
            }
            level = environment.resolvePlaceholders(level);
            system.setLogLevel(name, LogLevel.valueOf(level));
        } catch (RuntimeException ex) {
            this.logger.error("Cannot set level: " + level + " for '" + name + "'");
        }
    }

}