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 LinkedList<LogRecord> buffer = new LinkedList<>(); 033 private static LogViewerConlet conlet = null; 034 035 @Override 036 public void publish(LogRecord record) { 037 if (!isLoggable(record)) { 038 return; 039 } 040 synchronized (buffer) { 041 buffer.add(record); 042 while (buffer.size() > 100) { 043 buffer.remove(0); 044 } 045 } 046 if (conlet != null) { 047 conlet.addEntry(record); 048 } 049 } 050 051 /* default */ static List<LogRecord> setConlet(LogViewerConlet conlet) { 052 synchronized (buffer) { 053 LogViewerHandler.conlet = conlet; 054 return new ArrayList<LogRecord>(buffer); 055 } 056 } 057 058 @Override 059 public void flush() { 060 } 061 062 @Override 063 public void close() throws SecurityException { 064 buffer.clear(); 065 } 066 067}