1 /*
   2  * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.util.logging;
  27 
  28 import static java.nio.file.StandardOpenOption.APPEND;
  29 import static java.nio.file.StandardOpenOption.CREATE_NEW;
  30 import static java.nio.file.StandardOpenOption.WRITE;
  31 
  32 import java.io.BufferedOutputStream;
  33 import java.io.File;
  34 import java.io.FileOutputStream;
  35 import java.io.IOException;
  36 import java.io.OutputStream;
  37 import java.nio.channels.FileChannel;
  38 import java.nio.channels.OverlappingFileLockException;
  39 import java.nio.file.FileAlreadyExistsException;
  40 import java.nio.file.Files;
  41 import java.nio.file.LinkOption;
  42 import java.nio.file.NoSuchFileException;
  43 import java.nio.file.Path;
  44 import java.nio.file.Paths;
  45 import java.security.AccessController;
  46 import java.security.PrivilegedAction;
  47 import java.util.HashSet;
  48 import java.util.Set;
  49 
  50 /**
  51  * Simple file logging <tt>Handler</tt>.
  52  * <p>
  53  * The <tt>FileHandler</tt> can either write to a specified file,
  54  * or it can write to a rotating set of files.
  55  * <p>
  56  * For a rotating set of files, as each file reaches a given size
  57  * limit, it is closed, rotated out, and a new file opened.
  58  * Successively older files are named by adding "0", "1", "2",
  59  * etc. into the base filename.
  60  * <p>
  61  * By default buffering is enabled in the IO libraries but each log
  62  * record is flushed out when it is complete.
  63  * <p>
  64  * By default the <tt>XMLFormatter</tt> class is used for formatting.
  65  * <p>
  66  * <b>Configuration:</b>
  67  * By default each <tt>FileHandler</tt> is initialized using the following
  68  * <tt>LogManager</tt> configuration properties where <tt>&lt;handler-name&gt;</tt>
  69  * refers to the fully-qualified class name of the handler.
  70  * If properties are not defined
  71  * (or have invalid values) then the specified default values are used.
  72  * <ul>
  73  * <li>   &lt;handler-name&gt;.level
  74  *        specifies the default level for the <tt>Handler</tt>
  75  *        (defaults to <tt>Level.ALL</tt>). </li>
  76  * <li>   &lt;handler-name&gt;.filter
  77  *        specifies the name of a <tt>Filter</tt> class to use
  78  *        (defaults to no <tt>Filter</tt>). </li>
  79  * <li>   &lt;handler-name&gt;.formatter
  80  *        specifies the name of a <tt>Formatter</tt> class to use
  81  *        (defaults to <tt>java.util.logging.XMLFormatter</tt>) </li>
  82  * <li>   &lt;handler-name&gt;.encoding
  83  *        the name of the character set encoding to use (defaults to
  84  *        the default platform encoding). </li>
  85  * <li>   &lt;handler-name&gt;.limit
  86  *        specifies an approximate maximum amount to write (in bytes)
  87  *        to any one file.  If this is zero, then there is no limit.
  88  *        (Defaults to no limit). </li>
  89  * <li>   &lt;handler-name&gt;.count
  90  *        specifies how many output files to cycle through (defaults to 1). </li>
  91  * <li>   &lt;handler-name&gt;.pattern
  92  *        specifies a pattern for generating the output file name.  See
  93  *        below for details. (Defaults to "%h/java%u.log"). </li>
  94  * <li>   &lt;handler-name&gt;.append
  95  *        specifies whether the FileHandler should append onto
  96  *        any existing files (defaults to false). </li>
  97  * </ul>
  98  * <p>
  99  * For example, the properties for {@code FileHandler} would be:
 100  * <ul>
 101  * <li>   java.util.logging.FileHandler.level=INFO </li>
 102  * <li>   java.util.logging.FileHandler.formatter=java.util.logging.SimpleFormatter </li>
 103  * </ul>
 104  * <p>
 105  * For a custom handler, e.g. com.foo.MyHandler, the properties would be:
 106  * <ul>
 107  * <li>   com.foo.MyHandler.level=INFO </li>
 108  * <li>   com.foo.MyHandler.formatter=java.util.logging.SimpleFormatter </li>
 109  * </ul>
 110  * <p>
 111  * A pattern consists of a string that includes the following special
 112  * components that will be replaced at runtime:
 113  * <ul>
 114  * <li>    "/"    the local pathname separator </li>
 115  * <li>     "%t"   the system temporary directory </li>
 116  * <li>     "%h"   the value of the "user.home" system property </li>
 117  * <li>     "%g"   the generation number to distinguish rotated logs </li>
 118  * <li>     "%u"   a unique number to resolve conflicts </li>
 119  * <li>     "%%"   translates to a single percent sign "%" </li>
 120  * </ul>
 121  * If no "%g" field has been specified and the file count is greater
 122  * than one, then the generation number will be added to the end of
 123  * the generated filename, after a dot.
 124  * <p>
 125  * Thus for example a pattern of "%t/java%g.log" with a count of 2
 126  * would typically cause log files to be written on Solaris to
 127  * /var/tmp/java0.log and /var/tmp/java1.log whereas on Windows 95 they
 128  * would be typically written to C:\TEMP\java0.log and C:\TEMP\java1.log
 129  * <p>
 130  * Generation numbers follow the sequence 0, 1, 2, etc.
 131  * <p>
 132  * Normally the "%u" unique field is set to 0.  However, if the <tt>FileHandler</tt>
 133  * tries to open the filename and finds the file is currently in use by
 134  * another process it will increment the unique number field and try
 135  * again.  This will be repeated until <tt>FileHandler</tt> finds a file name that
 136  * is  not currently in use. If there is a conflict and no "%u" field has
 137  * been specified, it will be added at the end of the filename after a dot.
 138  * (This will be after any automatically added generation number.)
 139  * <p>
 140  * Thus if three processes were all trying to log to fred%u.%g.txt then
 141  * they  might end up using fred0.0.txt, fred1.0.txt, fred2.0.txt as
 142  * the first file in their rotating sequences.
 143  * <p>
 144  * Note that the use of unique ids to avoid conflicts is only guaranteed
 145  * to work reliably when using a local disk file system.
 146  *
 147  * @since 1.4
 148  */
 149 
 150 public class FileHandler extends StreamHandler {
 151     private MeteredStream meter;
 152     private boolean append;
 153     private int limit;       // zero => no limit.
 154     private int count;
 155     private String pattern;
 156     private String lockFileName;
 157     private FileChannel lockFileChannel;
 158     private File files[];
 159     private static final int MAX_LOCKS = 100;
 160     private static final Set<String> locks = new HashSet<>();
 161 
 162     /**
 163      * A metered stream is a subclass of OutputStream that
 164      * (a) forwards all its output to a target stream
 165      * (b) keeps track of how many bytes have been written
 166      */
 167     private class MeteredStream extends OutputStream {
 168         final OutputStream out;
 169         int written;
 170 
 171         MeteredStream(OutputStream out, int written) {
 172             this.out = out;
 173             this.written = written;
 174         }
 175 
 176         @Override
 177         public void write(int b) throws IOException {
 178             out.write(b);
 179             written++;
 180         }
 181 
 182         @Override
 183         public void write(byte buff[]) throws IOException {
 184             out.write(buff);
 185             written += buff.length;
 186         }
 187 
 188         @Override
 189         public void write(byte buff[], int off, int len) throws IOException {
 190             out.write(buff,off,len);
 191             written += len;
 192         }
 193 
 194         @Override
 195         public void flush() throws IOException {
 196             out.flush();
 197         }
 198 
 199         @Override
 200         public void close() throws IOException {
 201             out.close();
 202         }
 203     }
 204 
 205     private void open(File fname, boolean append) throws IOException {
 206         int len = 0;
 207         if (append) {
 208             len = (int)fname.length();
 209         }
 210         FileOutputStream fout = new FileOutputStream(fname.toString(), append);
 211         BufferedOutputStream bout = new BufferedOutputStream(fout);
 212         meter = new MeteredStream(bout, len);
 213         setOutputStream(meter);
 214     }
 215 
 216     /**
 217      * Configure a FileHandler from LogManager properties and/or default values
 218      * as specified in the class javadoc.
 219      */
 220     private void configure() {
 221         LogManager manager = LogManager.getLogManager();
 222 
 223         String cname = getClass().getName();
 224 
 225         pattern = manager.getStringProperty(cname + ".pattern", "%h/java%u.log");
 226         limit = manager.getIntProperty(cname + ".limit", 0);
 227         if (limit < 0) {
 228             limit = 0;
 229         }
 230         count = manager.getIntProperty(cname + ".count", 1);
 231         if (count <= 0) {
 232             count = 1;
 233         }
 234         append = manager.getBooleanProperty(cname + ".append", false);
 235         setLevel(manager.getLevelProperty(cname + ".level", Level.ALL));
 236         setFilter(manager.getFilterProperty(cname + ".filter", null));
 237         setFormatter(manager.getFormatterProperty(cname + ".formatter", new XMLFormatter()));
 238         try {
 239             setEncoding(manager.getStringProperty(cname +".encoding", null));
 240         } catch (Exception ex) {
 241             try {
 242                 setEncoding(null);
 243             } catch (Exception ex2) {
 244                 // doing a setEncoding with null should always work.
 245                 // assert false;
 246             }
 247         }
 248     }
 249 
 250 
 251     /**
 252      * Construct a default <tt>FileHandler</tt>.  This will be configured
 253      * entirely from <tt>LogManager</tt> properties (or their default values).
 254      *
 255      * @exception  IOException if there are IO problems opening the files.
 256      * @exception  SecurityException  if a security manager exists and if
 257      *             the caller does not have <tt>LoggingPermission("control"))</tt>.
 258      * @exception  NullPointerException if pattern property is an empty String.
 259      */
 260     public FileHandler() throws IOException, SecurityException {
 261         checkPermission();
 262         configure();
 263         openFiles();
 264     }
 265 
 266     /**
 267      * Initialize a <tt>FileHandler</tt> to write to the given filename.
 268      * <p>
 269      * The <tt>FileHandler</tt> is configured based on <tt>LogManager</tt>
 270      * properties (or their default values) except that the given pattern
 271      * argument is used as the filename pattern, the file limit is
 272      * set to no limit, and the file count is set to one.
 273      * <p>
 274      * There is no limit on the amount of data that may be written,
 275      * so use this with care.
 276      *
 277      * @param pattern  the name of the output file
 278      * @exception  IOException if there are IO problems opening the files.
 279      * @exception  SecurityException  if a security manager exists and if
 280      *             the caller does not have <tt>LoggingPermission("control")</tt>.
 281      * @exception  IllegalArgumentException if pattern is an empty string
 282      */
 283     public FileHandler(String pattern) throws IOException, SecurityException {
 284         if (pattern.length() < 1 ) {
 285             throw new IllegalArgumentException();
 286         }
 287         checkPermission();
 288         configure();
 289         this.pattern = pattern;
 290         this.limit = 0;
 291         this.count = 1;
 292         openFiles();
 293     }
 294 
 295     /**
 296      * Initialize a <tt>FileHandler</tt> to write to the given filename,
 297      * with optional append.
 298      * <p>
 299      * The <tt>FileHandler</tt> is configured based on <tt>LogManager</tt>
 300      * properties (or their default values) except that the given pattern
 301      * argument is used as the filename pattern, the file limit is
 302      * set to no limit, the file count is set to one, and the append
 303      * mode is set to the given <tt>append</tt> argument.
 304      * <p>
 305      * There is no limit on the amount of data that may be written,
 306      * so use this with care.
 307      *
 308      * @param pattern  the name of the output file
 309      * @param append  specifies append mode
 310      * @exception  IOException if there are IO problems opening the files.
 311      * @exception  SecurityException  if a security manager exists and if
 312      *             the caller does not have <tt>LoggingPermission("control")</tt>.
 313      * @exception  IllegalArgumentException if pattern is an empty string
 314      */
 315     public FileHandler(String pattern, boolean append) throws IOException,
 316             SecurityException {
 317         if (pattern.length() < 1 ) {
 318             throw new IllegalArgumentException();
 319         }
 320         checkPermission();
 321         configure();
 322         this.pattern = pattern;
 323         this.limit = 0;
 324         this.count = 1;
 325         this.append = append;
 326         openFiles();
 327     }
 328 
 329     /**
 330      * Initialize a <tt>FileHandler</tt> to write to a set of files.  When
 331      * (approximately) the given limit has been written to one file,
 332      * another file will be opened.  The output will cycle through a set
 333      * of count files.
 334      * <p>
 335      * The <tt>FileHandler</tt> is configured based on <tt>LogManager</tt>
 336      * properties (or their default values) except that the given pattern
 337      * argument is used as the filename pattern, the file limit is
 338      * set to the limit argument, and the file count is set to the
 339      * given count argument.
 340      * <p>
 341      * The count must be at least 1.
 342      *
 343      * @param pattern  the pattern for naming the output file
 344      * @param limit  the maximum number of bytes to write to any one file
 345      * @param count  the number of files to use
 346      * @exception  IOException if there are IO problems opening the files.
 347      * @exception  SecurityException  if a security manager exists and if
 348      *             the caller does not have <tt>LoggingPermission("control")</tt>.
 349      * @exception  IllegalArgumentException if {@code limit < 0}, or {@code count < 1}.
 350      * @exception  IllegalArgumentException if pattern is an empty string
 351      */
 352     public FileHandler(String pattern, int limit, int count)
 353                                         throws IOException, SecurityException {
 354         if (limit < 0 || count < 1 || pattern.length() < 1) {
 355             throw new IllegalArgumentException();
 356         }
 357         checkPermission();
 358         configure();
 359         this.pattern = pattern;
 360         this.limit = limit;
 361         this.count = count;
 362         openFiles();
 363     }
 364 
 365     /**
 366      * Initialize a <tt>FileHandler</tt> to write to a set of files
 367      * with optional append.  When (approximately) the given limit has
 368      * been written to one file, another file will be opened.  The
 369      * output will cycle through a set of count files.
 370      * <p>
 371      * The <tt>FileHandler</tt> is configured based on <tt>LogManager</tt>
 372      * properties (or their default values) except that the given pattern
 373      * argument is used as the filename pattern, the file limit is
 374      * set to the limit argument, and the file count is set to the
 375      * given count argument, and the append mode is set to the given
 376      * <tt>append</tt> argument.
 377      * <p>
 378      * The count must be at least 1.
 379      *
 380      * @param pattern  the pattern for naming the output file
 381      * @param limit  the maximum number of bytes to write to any one file
 382      * @param count  the number of files to use
 383      * @param append  specifies append mode
 384      * @exception  IOException if there are IO problems opening the files.
 385      * @exception  SecurityException  if a security manager exists and if
 386      *             the caller does not have <tt>LoggingPermission("control")</tt>.
 387      * @exception  IllegalArgumentException if {@code limit < 0}, or {@code count < 1}.
 388      * @exception  IllegalArgumentException if pattern is an empty string
 389      *
 390      */
 391     public FileHandler(String pattern, int limit, int count, boolean append)
 392                                         throws IOException, SecurityException {
 393         if (limit < 0 || count < 1 || pattern.length() < 1) {
 394             throw new IllegalArgumentException();
 395         }
 396         checkPermission();
 397         configure();
 398         this.pattern = pattern;
 399         this.limit = limit;
 400         this.count = count;
 401         this.append = append;
 402         openFiles();
 403     }
 404 
 405     private  boolean isParentWritable(Path path) {
 406         Path parent = path.getParent();
 407         if (parent == null) {
 408             parent = path.toAbsolutePath().getParent();
 409         }
 410         return parent != null && Files.isWritable(parent);
 411     }
 412 
 413     /**
 414      * Open the set of output files, based on the configured
 415      * instance variables.
 416      */
 417     private void openFiles() throws IOException {
 418         LogManager manager = LogManager.getLogManager();
 419         manager.checkPermission();
 420         if (count < 1) {
 421            throw new IllegalArgumentException("file count = " + count);
 422         }
 423         if (limit < 0) {
 424             limit = 0;
 425         }
 426         if (pattern == null || pattern.isEmpty()) {
 427             // can only happen if the default constructor was called: all
 428             // other constructors will have thrown IAE.
 429             throw new NullPointerException();
 430         }
 431 
 432         // We register our own ErrorManager during initialization
 433         // so we can record exceptions.
 434         InitializationErrorManager em = new InitializationErrorManager();
 435         setErrorManager(em);
 436 
 437         // Create a lock file.  This grants us exclusive access
 438         // to our set of output files, as long as we are alive.
 439         int unique = -1;
 440         for (;;) {
 441             unique++;
 442             if (unique > MAX_LOCKS) {
 443                 throw new IOException("Couldn't get lock for " + pattern);
 444             }
 445             // Generate a lock file name from the "unique" int.
 446             lockFileName = generate(pattern, 0, unique).toString() + ".lck";
 447             // Now try to lock that filename.
 448             // Because some systems (e.g., Solaris) can only do file locks
 449             // between processes (and not within a process), we first check
 450             // if we ourself already have the file locked.
 451             synchronized(locks) {
 452                 if (locks.contains(lockFileName)) {
 453                     // We already own this lock, for a different FileHandler
 454                     // object.  Try again.
 455                     continue;
 456                 }
 457 
 458                 final Path lockFilePath = Paths.get(lockFileName);
 459                 FileChannel channel = null;
 460                 int retries = -1;
 461                 boolean fileCreated = false;
 462                 while (channel == null && retries++ < 1) {
 463                     try {
 464                         channel = FileChannel.open(lockFilePath,
 465                                 CREATE_NEW, WRITE);
 466                         fileCreated = true;
 467                     } catch (FileAlreadyExistsException ix) {
 468                         // This may be a zombie file left over by a previous
 469                         // execution. Reuse it - but only if we can actually
 470                         // write to its directory.
 471                         // Note that this is a situation that may happen,
 472                         // but not too frequently.
 473                         if (Files.isRegularFile(lockFilePath, LinkOption.NOFOLLOW_LINKS)
 474                             && isParentWritable(lockFilePath)) {
 475                             try {
 476                                 channel = FileChannel.open(lockFilePath,
 477                                     WRITE, APPEND);
 478                             } catch (NoSuchFileException x) {
 479                                 // Race condition - retry once, and if that
 480                                 // fails again just try the next name in
 481                                 // the sequence.
 482                                 continue;
 483                             } catch(IOException x) {
 484                                 // the file may not be writable for us.
 485                                 // try the next name in the sequence
 486                                 break;
 487                             }
 488                         } else {
 489                             // at this point channel should still be null.
 490                             // break and try the next name in the sequence.
 491                             break;
 492                         }
 493                     }
 494                 }
 495 
 496                 if (channel == null) continue; // try the next name;
 497                 lockFileChannel = channel;
 498 
 499                 boolean available;
 500                 try {
 501                     available = lockFileChannel.tryLock() != null;
 502                     // We got the lock OK.
 503                     // At this point we could call File.deleteOnExit().
 504                     // However, this could have undesirable side effects
 505                     // as indicated by JDK-4872014. So we will instead
 506                     // rely on the fact that close() will remove the lock
 507                     // file and that whoever is creating FileHandlers should
 508                     // be responsible for closing them.
 509                 } catch (IOException ix) {
 510                     // We got an IOException while trying to get the lock.
 511                     // This normally indicates that locking is not supported
 512                     // on the target directory.  We have to proceed without
 513                     // getting a lock.   Drop through, but only if we did
 514                     // create the file...
 515                     available = fileCreated;
 516                 } catch (OverlappingFileLockException x) {
 517                     // someone already locked this file in this VM, through
 518                     // some other channel - that is - using something else
 519                     // than new FileHandler(...);
 520                     // continue searching for an available lock.
 521                     available = false;
 522                 }
 523                 if (available) {
 524                     // We got the lock.  Remember it.
 525                     locks.add(lockFileName);
 526                     break;
 527                 }
 528 
 529                 // We failed to get the lock.  Try next file.
 530                 lockFileChannel.close();
 531             }
 532         }
 533 
 534         files = new File[count];
 535         for (int i = 0; i < count; i++) {
 536             files[i] = generate(pattern, i, unique);
 537         }
 538 
 539         // Create the initial log file.
 540         if (append) {
 541             open(files[0], true);
 542         } else {
 543             rotate();
 544         }
 545 
 546         // Did we detect any exceptions during initialization?
 547         Exception ex = em.lastException;
 548         if (ex != null) {
 549             if (ex instanceof IOException) {
 550                 throw (IOException) ex;
 551             } else if (ex instanceof SecurityException) {
 552                 throw (SecurityException) ex;
 553             } else {
 554                 throw new IOException("Exception: " + ex);
 555             }
 556         }
 557 
 558         // Install the normal default ErrorManager.
 559         setErrorManager(new ErrorManager());
 560     }
 561 
 562     /**
 563      * Generate a file based on a user-supplied pattern, generation number,
 564      * and an integer uniqueness suffix
 565      * @param pattern the pattern for naming the output file
 566      * @param generation the generation number to distinguish rotated logs
 567      * @param unique a unique number to resolve conflicts
 568      * @return the generated File
 569      * @throws IOException
 570      */
 571     private File generate(String pattern, int generation, int unique)
 572             throws IOException {
 573         File file = null;
 574         String word = "";
 575         int ix = 0;
 576         boolean sawg = false;
 577         boolean sawu = false;
 578         while (ix < pattern.length()) {
 579             char ch = pattern.charAt(ix);
 580             ix++;
 581             char ch2 = 0;
 582             if (ix < pattern.length()) {
 583                 ch2 = Character.toLowerCase(pattern.charAt(ix));
 584             }
 585             if (ch == '/') {
 586                 if (file == null) {
 587                     file = new File(word);
 588                 } else {
 589                     file = new File(file, word);
 590                 }
 591                 word = "";
 592                 continue;
 593             } else  if (ch == '%') {
 594                 if (ch2 == 't') {
 595                     String tmpDir = System.getProperty("java.io.tmpdir");
 596                     if (tmpDir == null) {
 597                         tmpDir = System.getProperty("user.home");
 598                     }
 599                     file = new File(tmpDir);
 600                     ix++;
 601                     word = "";
 602                     continue;
 603                 } else if (ch2 == 'h') {
 604                     file = new File(System.getProperty("user.home"));
 605                     if (sun.misc.VM.isSetUID()) {
 606                         // Ok, we are in a set UID program.  For safety's sake
 607                         // we disallow attempts to open files relative to %h.
 608                         throw new IOException("can't use %h in set UID program");
 609                     }
 610                     ix++;
 611                     word = "";
 612                     continue;
 613                 } else if (ch2 == 'g') {
 614                     word = word + generation;
 615                     sawg = true;
 616                     ix++;
 617                     continue;
 618                 } else if (ch2 == 'u') {
 619                     word = word + unique;
 620                     sawu = true;
 621                     ix++;
 622                     continue;
 623                 } else if (ch2 == '%') {
 624                     word = word + "%";
 625                     ix++;
 626                     continue;
 627                 }
 628             }
 629             word = word + ch;
 630         }
 631         if (count > 1 && !sawg) {
 632             word = word + "." + generation;
 633         }
 634         if (unique > 0 && !sawu) {
 635             word = word + "." + unique;
 636         }
 637         if (word.length() > 0) {
 638             if (file == null) {
 639                 file = new File(word);
 640             } else {
 641                 file = new File(file, word);
 642             }
 643         }
 644         return file;
 645     }
 646 
 647     /**
 648      * Rotate the set of output files
 649      */
 650     private synchronized void rotate() {
 651         Level oldLevel = getLevel();
 652         setLevel(Level.OFF);
 653 
 654         super.close();
 655         for (int i = count-2; i >= 0; i--) {
 656             File f1 = files[i];
 657             File f2 = files[i+1];
 658             if (f1.exists()) {
 659                 if (f2.exists()) {
 660                     f2.delete();
 661                 }
 662                 f1.renameTo(f2);
 663             }
 664         }
 665         try {
 666             open(files[0], false);
 667         } catch (IOException ix) {
 668             // We don't want to throw an exception here, but we
 669             // report the exception to any registered ErrorManager.
 670             reportError(null, ix, ErrorManager.OPEN_FAILURE);
 671 
 672         }
 673         setLevel(oldLevel);
 674     }
 675 
 676     /**
 677      * Format and publish a <tt>LogRecord</tt>.
 678      *
 679      * @param  record  description of the log event. A null record is
 680      *                 silently ignored and is not published
 681      */
 682     @Override
 683     public synchronized void publish(LogRecord record) {
 684         if (!isLoggable(record)) {
 685             return;
 686         }
 687         super.publish(record);
 688         flush();
 689         if (limit > 0 && meter.written >= limit) {
 690             // We performed access checks in the "init" method to make sure
 691             // we are only initialized from trusted code.  So we assume
 692             // it is OK to write the target files, even if we are
 693             // currently being called from untrusted code.
 694             // So it is safe to raise privilege here.
 695             AccessController.doPrivileged(new PrivilegedAction<Object>() {
 696                 @Override
 697                 public Object run() {
 698                     rotate();
 699                     return null;
 700                 }
 701             });
 702         }
 703     }
 704 
 705     /**
 706      * Close all the files.
 707      *
 708      * @exception  SecurityException  if a security manager exists and if
 709      *             the caller does not have <tt>LoggingPermission("control")</tt>.
 710      */
 711     @Override
 712     public synchronized void close() throws SecurityException {
 713         super.close();
 714         // Unlock any lock file.
 715         if (lockFileName == null) {
 716             return;
 717         }
 718         try {
 719             // Close the lock file channel (which also will free any locks)
 720             lockFileChannel.close();
 721         } catch (Exception ex) {
 722             // Problems closing the stream.  Punt.
 723         }
 724         synchronized(locks) {
 725             locks.remove(lockFileName);
 726         }
 727         new File(lockFileName).delete();
 728         lockFileName = null;
 729         lockFileChannel = null;
 730     }
 731 
 732     private static class InitializationErrorManager extends ErrorManager {
 733         Exception lastException;
 734         @Override
 735         public void error(String msg, Exception ex, int code) {
 736             lastException = ex;
 737         }
 738     }
 739 }