org.springframework.boot.logging.DeferredLog.java Source code

Introduction

Here is the source code for org.springframework.boot.logging.DeferredLog.java

Source

/*
 * Copyright 2012-2015 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.springframework.boot.logging;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Deferred {@link Log} that can be used to store messages that shouldn't be written until
 * the logging system is fully initialized.
 *
 * @author Phillip Webb
 * @since 1.3.0
 */
public class DeferredLog implements Log {

    private List<Line> lines = new ArrayList<Line>();

    @Override
    public boolean isTraceEnabled() {
        return true;
    }

    @Override
    public boolean isDebugEnabled() {
        return true;
    }

    @Override
    public boolean isInfoEnabled() {
        return true;
    }

    @Override
    public boolean isWarnEnabled() {
        return true;
    }

    @Override
    public boolean isErrorEnabled() {
        return true;
    }

    @Override
    public boolean isFatalEnabled() {
        return true;
    }

    @Override
    public void trace(Object message) {
        log(LogLevel.TRACE, message, null);
    }

    @Override
    public void trace(Object message, Throwable t) {
        log(LogLevel.TRACE, message, t);
    }

    @Override
    public void debug(Object message) {
        log(LogLevel.DEBUG, message, null);
    }

    @Override
    public void debug(Object message, Throwable t) {
        log(LogLevel.DEBUG, message, t);
    }

    @Override
    public void info(Object message) {
        log(LogLevel.INFO, message, null);
    }

    @Override
    public void info(Object message, Throwable t) {
        log(LogLevel.INFO, message, t);
    }

    @Override
    public void warn(Object message) {
        log(LogLevel.WARN, message, null);
    }

    @Override
    public void warn(Object message, Throwable t) {
        log(LogLevel.WARN, message, t);
    }

    @Override
    public void error(Object message) {
        log(LogLevel.ERROR, message, null);
    }

    @Override
    public void error(Object message, Throwable t) {
        log(LogLevel.ERROR, message, t);
    }

    @Override
    public void fatal(Object message) {
        log(LogLevel.FATAL, message, null);
    }

    @Override
    public void fatal(Object message, Throwable t) {
        log(LogLevel.FATAL, message, t);
    }

    private void log(LogLevel level, Object message, Throwable t) {
        this.lines.add(new Line(level, message, t));
    }

    public void replayTo(Class<?> destination) {
        replayTo(LogFactory.getLog(destination));
    }

    public void replayTo(Log destination) {
        for (Line line : this.lines) {
            line.replayTo(destination);
        }
        this.lines.clear();
    }

    public static Log replay(Log source, Class<?> destination) {
        return replay(source, LogFactory.getLog(destination));
    }

    public static Log replay(Log source, Log destination) {
        if (source instanceof DeferredLog) {
            ((DeferredLog) source).replayTo(destination);
        }
        return destination;
    }

    private static class Line {

        private final LogLevel level;

        private final Object message;

        private final Throwable throwable;

        Line(LogLevel level, Object message, Throwable throwable) {
            this.level = level;
            this.message = message;
            this.throwable = throwable;
        }

        public void replayTo(Log log) {
            switch (this.level) {
            case TRACE:
                log.trace(this.message, this.throwable);
                return;
            case DEBUG:
                log.debug(this.message, this.throwable);
                return;
            case INFO:
                log.info(this.message, this.throwable);
                return;
            case WARN:
                log.warn(this.message, this.throwable);
                return;
            case ERROR:
                log.error(this.message, this.throwable);
                return;
            case FATAL:
                log.fatal(this.message, this.throwable);
                return;
            }
        }

    }

}