1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.io.OutputStream;
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7 | import java.io.PrintWriter;
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8 | import java.io.StringWriter;
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9 | import java.io.UnsupportedEncodingException;
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10 | import java.text.MessageFormat;
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11 | import java.util.ArrayList;
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12 | import java.util.Arrays;
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13 | import java.util.List;
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14 | import java.util.Locale;
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15 | import java.util.function.Supplier;
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16 | import java.util.logging.ConsoleHandler;
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17 | import java.util.logging.Handler;
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18 | import java.util.logging.Level;
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19 | import java.util.logging.LogRecord;
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20 | import java.util.logging.Logger;
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21 |
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22 | import org.openstreetmap.josm.tools.bugreport.BugReport;
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23 |
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24 | /**
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25 | * This class contains utility methods to log errors and warnings.
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26 | * <p>
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27 | * There are multiple log levels supported.
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28 | * @author Michael Zangl
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29 | * @since 10899
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30 | */
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31 | public final class Logging {
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32 | /**
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33 | * The josm internal log level indicating a severe error in the application that usually leads to a crash.
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34 | */
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35 | public static final Level LEVEL_ERROR = Level.SEVERE;
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36 | /**
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37 | * The josm internal log level to use when something that may lead to a crash or wrong behaviour has happened.
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38 | */
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39 | public static final Level LEVEL_WARN = Level.WARNING;
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40 | /**
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41 | * The josm internal log level to use for important events that will be useful when debugging problems
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42 | */
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43 | public static final Level LEVEL_INFO = Level.INFO;
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44 | /**
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45 | * The josm internal log level to print debug output
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46 | */
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47 | public static final Level LEVEL_DEBUG = Level.FINE;
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48 | /**
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49 | * The finest log level josm supports. This lets josm print a lot of debug output.
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50 | */
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51 | public static final Level LEVEL_TRACE = Level.FINEST;
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52 | private static final Logger LOGGER = Logger.getAnonymousLogger();
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53 | private static final RememberWarningHandler WARNINGS = new RememberWarningHandler();
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54 | private static final Stopwatch startup = Stopwatch.createStarted();
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55 |
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56 | /**
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57 | * A {@link ConsoleHandler} with a couple of extra features, allowing it to be targeted at an
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58 | * an arbitrary {@link OutputStream} which it can be asked to reacquire the reference for on demand
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59 | * through {@link #reacquireOutputStream()}. It can also prevent a LogRecord's output if a
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60 | * specified {@code prioritizedHandler} would have outputted it.
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61 | * @since 14052
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62 | */
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63 | public static class ReacquiringConsoleHandler extends ConsoleHandler {
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64 | private final Supplier<OutputStream> outputStreamSupplier;
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65 | private final Handler prioritizedHandler;
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66 | private OutputStream outputStreamMemo;
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67 | /**
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68 | * This variables is set to true as soon as the superconstructor has completed.
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69 | * The superconstructor calls {@code setOutputStream(System.err)}, any subsequent call of
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70 | * {@link #setOutputStream(OutputStream)} would then flush and close {@link System#err}. To avoid this,
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71 | * we override {@link #setOutputStream(OutputStream)} to completely ignore all calls from the superconstructor.
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72 | */
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73 | private final boolean superCompleted;
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74 |
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75 | /**
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76 | * Construct a new {@link ReacquiringConsoleHandler}.
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77 | * @param outputStreamSupplier A {@link Supplier} which will return the desired
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78 | * {@link OutputStream} for this handler when called. Particularly useful if you happen to be
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79 | * using a test framework which will switch out references to the stderr/stdout streams with
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80 | * new dummy ones from time to time.
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81 | * @param prioritizedHandler If non-null, will suppress output of any log records which pass this
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82 | * handler's {@code Handler#isLoggable(LogRecord)} method.
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83 | */
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84 | public ReacquiringConsoleHandler(
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85 | final Supplier<OutputStream> outputStreamSupplier,
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86 | final Handler prioritizedHandler
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87 | ) {
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88 | super();
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89 | superCompleted = true;
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90 | this.outputStreamSupplier = outputStreamSupplier;
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91 | this.prioritizedHandler = prioritizedHandler;
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92 |
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93 | try {
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94 | // Make sure we use the correct console encoding on Windows
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95 | this.setEncoding(System.getProperty("sun.stdout.encoding"));
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96 | } catch (SecurityException | UnsupportedEncodingException e) {
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97 | System.err.println(e);
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98 | }
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99 | this.reacquireOutputStream();
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100 | }
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101 |
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102 | /**
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103 | * Set output stream to one acquired from calling outputStreamSupplier
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104 | */
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105 | public synchronized void reacquireOutputStream() {
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106 | final OutputStream reacquiredStream = this.outputStreamSupplier.get(); // NOPMD
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107 |
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108 | // only bother calling setOutputStream if it's actually different, as setOutputStream
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109 | // has the nasty side effect of closing any previous output stream, which is certainly not
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110 | // what we would want were the new stream the same one
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111 | if (reacquiredStream != this.outputStreamMemo) {
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112 | this.setOutputStream(reacquiredStream);
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113 | }
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114 | }
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115 |
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116 | @Override
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117 | public synchronized void setOutputStream(final OutputStream outputStream) {
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118 | // Ignore calls from superconstructor (see javadoc of the variable for details)
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119 | if (superCompleted) {
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120 | // this wouldn't be necessary if StreamHandler made it possible to see what the current
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121 | // output stream is set to
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122 | this.outputStreamMemo = outputStream;
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123 | try {
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124 | super.setOutputStream(outputStream);
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125 | } catch (SecurityException e) {
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126 | System.err.println("Unable to set logging output stream: " + e.getMessage());
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127 | }
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128 | }
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129 | }
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130 |
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131 | @Override
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132 | public synchronized void publish(LogRecord logRecord) {
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133 | if (this.prioritizedHandler == null || !this.prioritizedHandler.isLoggable(logRecord)) {
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134 | super.publish(logRecord);
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135 | }
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136 | }
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137 | }
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138 |
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139 | static {
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140 | // We need to be sure java.locale.providers system property is initialized by JOSM, not by JRE
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141 | // The call to ConsoleHandler constructor makes the JRE access this property by side effect
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142 | I18n.setupJavaLocaleProviders();
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143 |
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144 | LOGGER.setLevel(Level.ALL);
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145 | LOGGER.setUseParentHandlers(false);
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146 |
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147 | // for a more concise logging output via java.util.logging.SimpleFormatter
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148 | Utils.updateSystemProperty("java.util.logging.SimpleFormatter.format", "%1$tF %1$tT.%1$tL %4$s: %5$s%6$s%n");
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149 |
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150 | ConsoleHandler stderr = new ReacquiringConsoleHandler(() -> System.err, null);
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151 | LOGGER.addHandler(stderr);
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152 | try {
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153 | stderr.setLevel(LEVEL_WARN);
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154 | } catch (SecurityException e) {
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155 | System.err.println("Unable to set logging level: " + e.getMessage());
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156 | }
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157 |
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158 | ConsoleHandler stdout = new ReacquiringConsoleHandler(() -> System.out, stderr);
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159 | LOGGER.addHandler(stdout);
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160 | try {
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161 | stdout.setLevel(Level.ALL);
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162 | } catch (SecurityException e) {
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163 | System.err.println("Unable to set logging level: " + e.getMessage());
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164 | }
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165 |
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166 | LOGGER.addHandler(WARNINGS);
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167 | // Set log level to info, otherwise the first ListenerList created will be for debugging purposes and create memory leaks
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168 | Logging.setLogLevel(Logging.LEVEL_INFO);
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169 | }
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170 |
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171 | private Logging() {
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172 | // hide
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173 | }
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174 |
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175 | /**
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176 | * Set the global log level.
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177 | * @param level The log level to use
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178 | */
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179 | public static void setLogLevel(Level level) {
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180 | LOGGER.setLevel(level);
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181 | }
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182 |
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183 | /**
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184 | * Prints an error message if logging is on.
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185 | * @param message The message to print.
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186 | */
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187 | public static void error(String message) {
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188 | logPrivate(LEVEL_ERROR, message);
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189 | }
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190 |
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191 | /**
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192 | * Prints a formatted error message if logging is on. Calls {@link MessageFormat#format}
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193 | * function to format text.
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194 | * @param pattern The formatted message to print.
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195 | * @param args The objects to insert into format string.
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196 | */
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197 | public static void error(String pattern, Object... args) {
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198 | logPrivate(LEVEL_ERROR, pattern, args);
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199 | }
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200 |
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201 | /**
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202 | * Prints an error message for the given Throwable if logging is on.
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203 | * @param t The throwable object causing the error.
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204 | * @since 12620
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205 | */
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206 | public static void error(Throwable t) {
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207 | logWithStackTrace(Logging.LEVEL_ERROR, t);
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208 | }
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209 |
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210 | /**
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211 | * Prints a warning message if logging is on.
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212 | * @param message The message to print.
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213 | */
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214 | public static void warn(String message) {
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215 | logPrivate(LEVEL_WARN, message);
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216 | }
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217 |
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218 | /**
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219 | * Prints a formatted warning message if logging is on. Calls {@link MessageFormat#format}
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220 | * function to format text.
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221 | * @param pattern The formatted message to print.
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222 | * @param args The objects to insert into format string.
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223 | */
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224 | public static void warn(String pattern, Object... args) {
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225 | logPrivate(LEVEL_WARN, pattern, args);
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226 | }
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227 |
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228 | /**
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229 | * Prints a warning message for the given Throwable if logging is on.
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230 | * @param t The throwable object causing the error.
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231 | * @since 12620
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232 | */
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233 | public static void warn(Throwable t) {
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234 | logWithStackTrace(Logging.LEVEL_WARN, t);
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235 | }
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236 |
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237 | /**
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238 | * Prints a info message if logging is on.
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239 | * @param message The message to print.
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240 | */
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241 | public static void info(String message) {
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242 | logPrivate(LEVEL_INFO, message);
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243 | }
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244 |
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245 | /**
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246 | * Prints a formatted info message if logging is on. Calls {@link MessageFormat#format}
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247 | * function to format text.
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248 | * @param pattern The formatted message to print.
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249 | * @param args The objects to insert into format string.
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250 | */
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251 | public static void info(String pattern, Object... args) {
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252 | logPrivate(LEVEL_INFO, pattern, args);
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253 | }
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254 |
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255 | /**
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256 | * Prints a info message for the given Throwable if logging is on.
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257 | * @param t The throwable object causing the error.
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258 | * @since 12620
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259 | */
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260 | public static void info(Throwable t) {
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261 | logWithStackTrace(Logging.LEVEL_INFO, t);
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262 | }
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263 |
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264 | /**
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265 | * Prints a debug message if logging is on.
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266 | * @param message The message to print.
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267 | */
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268 | public static void debug(String message) {
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269 | logPrivate(LEVEL_DEBUG, message);
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270 | }
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271 |
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272 | /**
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273 | * Prints a formatted debug message if logging is on. Calls {@link MessageFormat#format}
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274 | * function to format text.
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275 | * @param pattern The formatted message to print.
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276 | * @param args The objects to insert into format string.
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277 | */
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278 | public static void debug(String pattern, Object... args) {
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279 | logPrivate(LEVEL_DEBUG, pattern, args);
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280 | }
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281 |
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282 | /**
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283 | * Prints a debug message for the given Throwable if logging is on.
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284 | * @param t The throwable object causing the error.
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285 | * @since 12620
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286 | */
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287 | public static void debug(Throwable t) {
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288 | log(Logging.LEVEL_DEBUG, t);
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289 | }
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290 |
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291 | /**
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292 | * Prints a trace message if logging is on.
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293 | * @param message The message to print.
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294 | */
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295 | public static void trace(String message) {
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296 | logPrivate(LEVEL_TRACE, message);
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297 | }
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298 |
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299 | /**
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300 | * Prints a formatted trace message if logging is on. Calls {@link MessageFormat#format}
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301 | * function to format text.
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302 | * @param pattern The formatted message to print.
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303 | * @param args The objects to insert into format string.
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304 | */
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305 | public static void trace(String pattern, Object... args) {
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306 | logPrivate(LEVEL_TRACE, pattern, args);
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307 | }
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308 |
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309 | /**
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310 | * Prints a trace message for the given Throwable if logging is on.
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311 | * @param t The throwable object causing the error.
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312 | * @since 12620
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313 | */
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314 | public static void trace(Throwable t) {
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315 | log(Logging.LEVEL_TRACE, t);
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316 | }
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317 |
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318 | /**
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319 | * Logs a throwable that happened. The stack trace is not added to the log.
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320 | * @param level The level.
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321 | * @param t The throwable that should be logged.
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322 | * @see #logWithStackTrace(Level, Throwable)
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323 | */
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324 | public static void log(Level level, Throwable t) {
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325 | logPrivate(level, () -> getErrorLog(null, t));
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326 | }
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327 |
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328 | /**
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329 | * Logs a throwable that happened. The stack trace is not added to the log.
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330 | * @param level The level.
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331 | * @param message An additional error message
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332 | * @param t The throwable that caused the message
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333 | * @see #logWithStackTrace(Level, String, Throwable)
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334 | */
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335 | public static void log(Level level, String message, Throwable t) {
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336 | logPrivate(level, () -> getErrorLog(message, t));
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337 | }
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338 |
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339 | /**
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340 | * Logs a throwable that happened. Adds the stack trace to the log.
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341 | * @param level The level.
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342 | * @param t The throwable that should be logged.
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343 | * @see #log(Level, Throwable)
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344 | */
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345 | public static void logWithStackTrace(Level level, Throwable t) {
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346 | logPrivate(level, () -> getErrorLogWithStack(null, t));
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347 | }
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348 |
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349 | /**
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350 | * Logs a throwable that happened. Adds the stack trace to the log.
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351 | * @param level The level.
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352 | * @param message An additional error message
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353 | * @param t The throwable that should be logged.
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354 | * @see #logWithStackTrace(Level, Throwable)
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355 | */
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356 | public static void logWithStackTrace(Level level, String message, Throwable t) {
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357 | logPrivate(level, () -> getErrorLogWithStack(message, t));
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358 | }
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359 |
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360 | /**
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361 | * Logs a throwable that happened. Adds the stack trace to the log.
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362 | * @param level The level.
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363 | * @param t The throwable that should be logged.
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364 | * @param pattern The formatted message to print.
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365 | * @param args The objects to insert into format string
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366 | * @see #logWithStackTrace(Level, Throwable)
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367 | */
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368 | public static void logWithStackTrace(Level level, Throwable t, String pattern, Object... args) {
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369 | logPrivate(level, () -> getErrorLogWithStack(MessageFormat.format(pattern, args), t));
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370 | }
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371 |
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372 | private static void logPrivate(Level level, String pattern, Object... args) {
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373 | logPrivate(level, () -> MessageFormat.format(pattern, args));
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374 | }
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375 |
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376 | private static void logPrivate(Level level, String message) {
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377 | logPrivate(level, () -> message);
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378 | }
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379 |
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380 | private static void logPrivate(Level level, Supplier<String> supplier) {
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381 | // all log methods immediately call one of the logPrivate methods.
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382 | if (LOGGER.isLoggable(level)) {
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383 | StackTraceElement callingMethod = BugReport.getCallingMethod(1, Logging.class.getName(), name -> !"logPrivate".equals(name));
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384 | LOGGER.logp(level, callingMethod.getClassName(), callingMethod.getMethodName(), supplier);
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385 | }
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386 | }
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387 |
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388 | /**
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389 | * Tests if a given log level is enabled. This can be used to avoid constructing debug data if required.
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390 | *
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391 | * For formatting text, you should use the {@link #debug(String, Object...)} message
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392 | * @param level A level constant. You can e.g. use {@link Logging#LEVEL_ERROR}
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393 | * @return <code>true</code> if log level is enabled.
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394 | */
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395 | public static boolean isLoggingEnabled(Level level) {
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396 | return LOGGER.isLoggable(level);
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397 | }
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398 |
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399 | /**
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400 | * Determines if debug log level is enabled.
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401 | * Useful to avoid costly construction of debug messages when not enabled.
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402 | * @return {@code true} if log level is at least debug, {@code false} otherwise
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403 | * @since 12620
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404 | */
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405 | public static boolean isDebugEnabled() {
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406 | return isLoggingEnabled(Logging.LEVEL_DEBUG);
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407 | }
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408 |
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409 | /**
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410 | * Determines if trace log level is enabled.
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411 | * Useful to avoid costly construction of trace messages when not enabled.
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412 | * @return {@code true} if log level is at least trace, {@code false} otherwise
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413 | * @since 12620
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414 | */
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415 | public static boolean isTraceEnabled() {
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416 | return isLoggingEnabled(Logging.LEVEL_TRACE);
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417 | }
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418 |
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419 | private static String getErrorLog(String message, Throwable t) {
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420 | StringBuilder sb = new StringBuilder();
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421 | if (message != null) {
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422 | sb.append(message).append(": ");
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423 | }
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424 | sb.append(getErrorMessage(t));
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425 | return sb.toString();
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426 | }
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427 |
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428 | private static String getErrorLogWithStack(String message, Throwable t) {
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429 | StringWriter sb = new StringWriter();
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430 | sb.append(getErrorLog(message, t));
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431 | if (t != null) {
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432 | sb.append('\n');
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433 | t.printStackTrace(new PrintWriter(sb));
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434 | }
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435 | return sb.toString();
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436 | }
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437 |
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438 | /**
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439 | * Returns a human-readable message of error, also usable for developers.
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440 | * @param t The error
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441 | * @return The human-readable error message
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442 | */
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443 | public static String getErrorMessage(Throwable t) {
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444 | if (t == null) {
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445 | return "(no error)";
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446 | }
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447 | StringBuilder sb = new StringBuilder(t.getClass().getName());
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448 | String msg = t.getMessage();
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449 | if (msg != null) {
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450 | sb.append(": ").append(msg.trim());
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451 | }
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452 | Throwable cause = t.getCause();
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453 | if (cause != null && !cause.equals(t)) {
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454 | // this may cause infinite loops in the unlikely case that there is a loop in the causes.
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455 | sb.append(". ").append(tr("Cause: ")).append(getErrorMessage(cause));
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456 | }
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457 | return sb.toString();
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458 | }
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459 |
|
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460 | /**
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461 | * Clear the list of last warnings
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462 | */
|
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463 | public static void clearLastErrorAndWarnings() {
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464 | WARNINGS.clear();
|
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465 | }
|
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466 |
|
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467 | /**
|
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468 | * Get the last error and warning messages in the order in which they were received.
|
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469 | * @return The last errors and warnings.
|
---|
470 | */
|
---|
471 | public static List<String> getLastErrorAndWarnings() {
|
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472 | return WARNINGS.getMessages();
|
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473 | }
|
---|
474 |
|
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475 | /**
|
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476 | * Provides direct access to the logger used. Use of methods like {@link #warn(String)} is preferred.
|
---|
477 | * @return The logger
|
---|
478 | */
|
---|
479 | public static Logger getLogger() {
|
---|
480 | return LOGGER;
|
---|
481 | }
|
---|
482 |
|
---|
483 | private static final class RememberWarningHandler extends Handler {
|
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484 | private final String[] log = new String[10];
|
---|
485 | private int messagesLogged;
|
---|
486 |
|
---|
487 | synchronized void clear() {
|
---|
488 | messagesLogged = 0;
|
---|
489 | Arrays.fill(log, null);
|
---|
490 | }
|
---|
491 |
|
---|
492 | @Override
|
---|
493 | public synchronized void publish(LogRecord logRecord) {
|
---|
494 | // We don't use setLevel + isLoggable to work in WebStart Sandbox mode
|
---|
495 | if (logRecord.getLevel().intValue() < LEVEL_WARN.intValue()) {
|
---|
496 | return;
|
---|
497 | }
|
---|
498 |
|
---|
499 | String msg = String.format(Locale.ROOT, "%09.3f %s%s", startup.elapsed() / 1000., getPrefix(logRecord), logRecord.getMessage());
|
---|
500 |
|
---|
501 | // Only remember first line of message
|
---|
502 | int idx = msg.indexOf('\n');
|
---|
503 | if (idx > 0) {
|
---|
504 | msg = msg.substring(0, idx);
|
---|
505 | }
|
---|
506 | log[messagesLogged % log.length] = msg;
|
---|
507 | messagesLogged++;
|
---|
508 | }
|
---|
509 |
|
---|
510 | private static String getPrefix(LogRecord logRecord) {
|
---|
511 | if (logRecord.getLevel().equals(LEVEL_WARN)) {
|
---|
512 | return "W: ";
|
---|
513 | } else {
|
---|
514 | // worse than warn
|
---|
515 | return "E: ";
|
---|
516 | }
|
---|
517 | }
|
---|
518 |
|
---|
519 | synchronized List<String> getMessages() {
|
---|
520 | List<String> logged = Arrays.asList(log);
|
---|
521 | ArrayList<String> res = new ArrayList<>();
|
---|
522 | int logOffset = messagesLogged % log.length;
|
---|
523 | if (messagesLogged > logOffset) {
|
---|
524 | res.addAll(logged.subList(logOffset, log.length));
|
---|
525 | }
|
---|
526 | res.addAll(logged.subList(0, logOffset));
|
---|
527 | return res;
|
---|
528 | }
|
---|
529 |
|
---|
530 | @Override
|
---|
531 | public synchronized void flush() {
|
---|
532 | // nothing to do
|
---|
533 | }
|
---|
534 |
|
---|
535 | @Override
|
---|
536 | public void close() {
|
---|
537 | // nothing to do
|
---|
538 | }
|
---|
539 | }
|
---|
540 | }
|
---|