| 1 | /* This file is part of the project "Hilbert II" - http://www.qedeq.org |
| 2 | * |
| 3 | * Copyright 2000-2014, Michael Meyling <mime@qedeq.org>. |
| 4 | * |
| 5 | * "Hilbert II" is free software; you can redistribute |
| 6 | * it and/or modify it under the terms of the GNU General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | package org.qedeq.kernel.bo.log; |
| 17 | |
| 18 | import java.util.ArrayList; |
| 19 | import java.util.List; |
| 20 | |
| 21 | import org.qedeq.base.trace.Trace; |
| 22 | |
| 23 | |
| 24 | /** |
| 25 | * This class organizes the logging. |
| 26 | * |
| 27 | * TODO 20110606 m31: this class is a singleton but it would be better if it is not |
| 28 | * to accomplish this we must put a getLogInstance method in all |
| 29 | * important BO classes. |
| 30 | * |
| 31 | * @author Michael Meyling |
| 32 | */ |
| 33 | public final class QedeqLog implements LogListener { |
| 34 | |
| 35 | /** This class. */ |
| 36 | private static final Class CLASS = QedeqLog.class; |
| 37 | |
| 38 | /** The one and only instance. */ |
| 39 | private static QedeqLog instance = new QedeqLog(); |
| 40 | |
| 41 | /** The loggers. */ |
| 42 | private List loggers = new ArrayList(); |
| 43 | |
| 44 | |
| 45 | /** |
| 46 | * Get instance of Logger. |
| 47 | * |
| 48 | * @return singleton |
| 49 | */ |
| 50 | public static final QedeqLog getInstance() { |
| 51 | return instance; |
| 52 | } |
| 53 | |
| 54 | |
| 55 | /** |
| 56 | * Don't use me outside of this class. |
| 57 | */ |
| 58 | private QedeqLog() { |
| 59 | // nothing to do |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Add listener. |
| 64 | * |
| 65 | * @param log Add this listener. |
| 66 | */ |
| 67 | public synchronized void addLog(final LogListener log) { |
| 68 | if (log == null) { |
| 69 | return; |
| 70 | } |
| 71 | loggers.add(log); |
| 72 | Trace.paramInfo(CLASS, this, "addLog(LogListener)", "log", log.getClass()); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Remove listener. |
| 77 | * |
| 78 | * @param log Remove this listener. |
| 79 | */ |
| 80 | public synchronized void removeLog(final LogListener log) { |
| 81 | loggers.remove(log); |
| 82 | if (log != null) { |
| 83 | Trace.paramInfo(CLASS, this, "removeLog(LogListener)", "log", log.getClass()); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | public synchronized void logMessageState(final String text, final String url) { |
| 88 | for (int i = 0; i < loggers.size(); i++) { |
| 89 | try { // we don't know if the LogListener is free of programming errors... |
| 90 | ((LogListener) loggers.get(i)).logMessageState(text, url); |
| 91 | } catch (RuntimeException e) { |
| 92 | Trace.fatal(CLASS, this, "logMessageState", "LogListener throwed RuntimeException", |
| 93 | e); |
| 94 | } |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | public synchronized void logFailureState(final String text, final String url, final String description) { |
| 99 | for (int i = 0; i < loggers.size(); i++) { |
| 100 | try { // we don't know if the LogListener is free of programming errors... |
| 101 | ((LogListener) loggers.get(i)).logFailureState(text, url, description); |
| 102 | } catch (RuntimeException e) { |
| 103 | Trace.fatal(CLASS, this, "logFailureState", "LogListener throwed RuntimeException", |
| 104 | e); |
| 105 | } |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | public synchronized void logSuccessfulState(final String text, final String url) { |
| 110 | for (int i = 0; i < loggers.size(); i++) { |
| 111 | try { // we don't know if the LogListener is free of programming errors... |
| 112 | ((LogListener) loggers.get(i)).logSuccessfulState(text, url); |
| 113 | } catch (RuntimeException e) { |
| 114 | Trace.fatal(CLASS, this, "logSuccessfulState", |
| 115 | "LogListener throwed RuntimeException", e); |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | public synchronized void logRequest(final String text, final String url) { |
| 121 | for (int i = 0; i < loggers.size(); i++) { |
| 122 | try { // we don't know if the LogListener is free of programming errors... |
| 123 | ((LogListener) loggers.get(i)).logRequest(text, url); |
| 124 | } catch (RuntimeException e) { |
| 125 | Trace.fatal(CLASS, this, "logRequest", "LogListener throwed RuntimeException", e); |
| 126 | } |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | public synchronized void logSuccessfulReply(final String text, final String url) { |
| 131 | for (int i = 0; i < loggers.size(); i++) { |
| 132 | try { // we don't know if the LogListener is free of programming errors... |
| 133 | ((LogListener) loggers.get(i)).logSuccessfulReply(text, url); |
| 134 | } catch (RuntimeException e) { |
| 135 | Trace.fatal(CLASS, this, "logSuccessfulReply", "LogListener throwed RuntimeException", |
| 136 | e); |
| 137 | } |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | public synchronized void logFailureReply(final String text, final String url, final String description) { |
| 142 | for (int i = 0; i < loggers.size(); i++) { |
| 143 | try { // we don't know if the LogListener is free of programming errors... |
| 144 | ((LogListener) loggers.get(i)).logFailureReply(text, url, description); |
| 145 | } catch (RuntimeException e) { |
| 146 | Trace.fatal(CLASS, this, "logFailureReply", "LogListener throwed RuntimeException", |
| 147 | e); |
| 148 | } |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | public synchronized void logMessage(final String text) { |
| 153 | for (int i = 0; i < loggers.size(); i++) { |
| 154 | try { // we don't know if the LogListener is free of programming errors... |
| 155 | ((LogListener) loggers.get(i)).logMessage(text); |
| 156 | } catch (RuntimeException e) { |
| 157 | Trace.fatal(CLASS, this, "logMessage", "LogListener throwed RuntimeException", e); |
| 158 | } |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | |
| 163 | } |