001/*
002 * JGrapes Event Driven Framework
003 * Copyright (C) 2023 Michael N. Lipp
004 * 
005 * This program is free software; you can redistribute it and/or modify it 
006 * under the terms of the GNU General Public License as published by 
007 * the Free Software Foundation; either version 3 of the License, or 
008 * (at your option) any later version.
009 * 
010 * This program is distributed in the hope that it will be useful, but 
011 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
012 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
013 * for more details.
014 * 
015 * You should have received a copy of the GNU General Public License along 
016 * with this program; if not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jgrapes.webconlet.logviewer;
020
021import java.util.ArrayList;
022import java.util.LinkedList;
023import java.util.List;
024import java.util.logging.Handler;
025import java.util.logging.LogRecord;
026
027/**
028 * The Class LogViewerHandler.
029 */
030public class LogViewerHandler extends Handler {
031
032    private static List<LogRecord> buffer = new LinkedList<>();
033    private static LogViewerConlet conlet;
034
035    @Override
036    @SuppressWarnings("PMD.AvoidSynchronizedStatement")
037    public void publish(LogRecord record) {
038        if (!isLoggable(record)) {
039            return;
040        }
041        synchronized (buffer) {
042            buffer.add(record);
043            while (buffer.size() > 100) {
044                buffer.remove(0);
045            }
046        }
047        if (conlet != null) {
048            conlet.addEntry(record);
049        }
050    }
051
052    @SuppressWarnings("PMD.AvoidSynchronizedStatement")
053    /* default */ static List<LogRecord> setConlet(LogViewerConlet conlet) {
054        synchronized (buffer) {
055            LogViewerHandler.conlet = conlet;
056            return new ArrayList<>(buffer);
057        }
058    }
059
060    @Override
061    public void flush() {
062        // Nothing to do.
063    }
064
065    @Override
066    public void close() {
067        buffer.clear();
068    }
069
070}