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