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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.
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/*
 * 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.
 */
package org.apache.logging.log4j.status;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.io.Serializable;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.message.Message;

import static org.apache.logging.log4j.util.Chars.*;

/**
 * The Status data.
 */
public class StatusData implements Serializable {

    private static final long serialVersionUID = -4341916115118014017L;

    private final long timestamp;
    private final StackTraceElement caller;
    private final Level level;
    private final Message msg;
    private String threadName;
    private final Throwable throwable;

    /**
     * Creates the StatusData object.
     * 
     * @param caller The method that created the event.
     * @param level The logging level.
     * @param msg The message String.
     * @param t The Error or Exception that occurred.
     * @param threadName The thread name
     */
    public StatusData(final StackTraceElement caller, final Level level, final Message msg, final Throwable t,
            String threadName) {
        this.timestamp = System.currentTimeMillis();
        this.caller = caller;
        this.level = level;
        this.msg = msg;
        this.throwable = t;
        this.threadName = threadName;
    }

    /**
     * Returns the event's timestamp.
     * 
     * @return The event's timestamp.
     */
    public long getTimestamp() {
        return timestamp;
    }

    /**
     * Returns the StackTraceElement for the method that created the event.
     * 
     * @return The StackTraceElement.
     */
    public StackTraceElement getStackTraceElement() {
        return caller;
    }

    /**
     * Returns the logging level for the event.
     * 
     * @return The logging level.
     */
    public Level getLevel() {
        return level;
    }

    /**
     * Returns the message associated with the event.
     * 
     * @return The message associated with the event.
     */
    public Message getMessage() {
        return msg;
    }

    public String getThreadName() {
        if (threadName == null) {
            threadName = Thread.currentThread().getName();
        }
        return threadName;
    }

    /**
     * Returns the Throwable associated with the event.
     * 
     * @return The Throwable associated with the event.
     */
    public Throwable getThrowable() {
        return throwable;
    }

    /**
     * Formats the StatusData for viewing.
     * 
     * @return The formatted status data as a String.
     */
    public String getFormattedStatus() {
        final StringBuilder sb = new StringBuilder();
        final SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss,SSS");
        sb.append(format.format(new Date(timestamp)));
        sb.append(SPACE);
        sb.append(getThreadName());
        sb.append(SPACE);
        sb.append(level.toString());
        sb.append(SPACE);
        sb.append(msg.getFormattedMessage());
        final Object[] params = msg.getParameters();
        Throwable t;
        if (throwable == null && params != null && params[params.length - 1] instanceof Throwable) {
            t = (Throwable) params[params.length - 1];
        } else {
            t = throwable;
        }
        if (t != null) {
            sb.append(SPACE);
            final ByteArrayOutputStream baos = new ByteArrayOutputStream();
            t.printStackTrace(new PrintStream(baos));
            sb.append(baos.toString());
        }
        return sb.toString();
    }
}