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Jetty example source code file (RolloverFileOutputStream.java)
The Jetty RolloverFileOutputStream.java source code//======================================================================== //Copyright 2006 Mort Bay Consulting Pty. Ltd. //------------------------------------------------------------------------ //Licensed under the Apache License, Version 2.0 (the "License"); //you may not use this file except in compliance with the License. //You may obtain a copy of the License at //http://www.apache.org/licenses/LICENSE-2.0 //Unless required by applicable law or agreed to in writing, software //distributed under the License is distributed on an "AS IS" BASIS, //WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. //See the License for the specific language governing permissions and //limitations under the License. //======================================================================== package org.mortbay.util; import java.io.File; import java.io.FileOutputStream; import java.io.FilterOutputStream; import java.io.IOException; import java.io.OutputStream; import java.lang.ref.WeakReference; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; import java.util.ListIterator; import java.util.StringTokenizer; import java.util.TimeZone; import java.util.Timer; import java.util.TimerTask; /** * RolloverFileOutputStream * * This output stream puts content in a file that is rolled over every 24 hours. * The filename must include the string "yyyy_mm_dd", which is replaced with the * actual date when creating and rolling over the file. * * Old files are retained for a number of days before being deleted. * * @author Greg Wilkins */ public class RolloverFileOutputStream extends FilterOutputStream { private static Timer __rollover; final static String YYYY_MM_DD="yyyy_mm_dd"; private RollTask _rollTask; private SimpleDateFormat _fileBackupFormat; private SimpleDateFormat _fileDateFormat; private String _filename; private File _file; private boolean _append; private int _retainDays; /* ------------------------------------------------------------ */ /** * @param filename The filename must include the string "yyyy_mm_dd", * which is replaced with the actual date when creating and rolling over the file. * @throws IOException */ public RolloverFileOutputStream(String filename) throws IOException { this(filename,true,Integer.getInteger("ROLLOVERFILE_RETAIN_DAYS",31).intValue()); } /* ------------------------------------------------------------ */ /** * @param filename The filename must include the string "yyyy_mm_dd", * which is replaced with the actual date when creating and rolling over the file. * @param append If true, existing files will be appended to. * @throws IOException */ public RolloverFileOutputStream(String filename, boolean append) throws IOException { this(filename,append,Integer.getInteger("ROLLOVERFILE_RETAIN_DAYS",31).intValue()); } /* ------------------------------------------------------------ */ /** * @param filename The filename must include the string "yyyy_mm_dd", * which is replaced with the actual date when creating and rolling over the file. * @param append If true, existing files will be appended to. * @param retainDays The number of days to retain files before deleting them. 0 to retain forever. * @throws IOException */ public RolloverFileOutputStream(String filename, boolean append, int retainDays) throws IOException { this(filename,append,retainDays,TimeZone.getDefault()); } /* ------------------------------------------------------------ */ /** * @param filename The filename must include the string "yyyy_mm_dd", * which is replaced with the actual date when creating and rolling over the file. * @param append If true, existing files will be appended to. * @param retainDays The number of days to retain files before deleting them. 0 to retain forever. * @throws IOException */ public RolloverFileOutputStream(String filename, boolean append, int retainDays, TimeZone zone) throws IOException { this(filename,append,retainDays,zone,null,null); } /* ------------------------------------------------------------ */ /** * @param filename The filename must include the string "yyyy_mm_dd", * which is replaced with the actual date when creating and rolling over the file. * @param append If true, existing files will be appended to. * @param retainDays The number of days to retain files before deleting them. 0 to retain forever. * @param dateFormat The format for the date file substitution. If null the system property ROLLOVERFILE_DATE_FORMAT is * used and if that is null, then default is "yyyy_MM_dd". * @param backupFormat The format for the file extension of backup files. If null the system property * ROLLOVERFILE_BACKUP_FORMAT is used and if that is null, then default is "HHmmssSSS". * @throws IOException */ public RolloverFileOutputStream(String filename, boolean append, int retainDays, TimeZone zone, String dateFormat, String backupFormat) throws IOException { super(null); if (dateFormat==null) dateFormat=System.getProperty("ROLLOVERFILE_DATE_FORMAT","yyyy_MM_dd"); _fileDateFormat = new SimpleDateFormat(dateFormat); if (backupFormat==null) backupFormat=System.getProperty("ROLLOVERFILE_BACKUP_FORMAT","HHmmssSSS"); _fileBackupFormat = new SimpleDateFormat(backupFormat); _fileBackupFormat.setTimeZone(zone); _fileDateFormat.setTimeZone(zone); if (filename!=null) { filename=filename.trim(); if (filename.length()==0) filename=null; } if (filename==null) throw new IllegalArgumentException("Invalid filename"); _filename=filename; _append=append; _retainDays=retainDays; setFile(); synchronized(RolloverFileOutputStream.class) { if (__rollover==null) __rollover=new Timer(true); _rollTask=new RollTask(); Calendar now = Calendar.getInstance(); now.setTimeZone(zone); GregorianCalendar midnight = new GregorianCalendar(now.get(Calendar.YEAR), now.get(Calendar.MONTH), now.get(Calendar.DAY_OF_MONTH), 23,0); midnight.setTimeZone(zone); midnight.add(Calendar.HOUR,1); __rollover.scheduleAtFixedRate(_rollTask,midnight.getTime(),1000L*60*60*24); } } /* ------------------------------------------------------------ */ public String getFilename() { return _filename; } /* ------------------------------------------------------------ */ public String getDatedFilename() { if (_file==null) return null; return _file.toString(); } /* ------------------------------------------------------------ */ public int getRetainDays() { return _retainDays; } /* ------------------------------------------------------------ */ private synchronized void setFile() throws IOException { // Check directory File file = new File(_filename); _filename=file.getCanonicalPath(); file=new File(_filename); File dir= new File(file.getParent()); if (!dir.isDirectory() || !dir.canWrite()) throw new IOException("Cannot write log directory "+dir); Date now=new Date(); // Is this a rollover file? String filename=file.getName(); int i=filename.toLowerCase().indexOf(YYYY_MM_DD); if (i>=0) { file=new File(dir, filename.substring(0,i)+ _fileDateFormat.format(now)+ filename.substring(i+YYYY_MM_DD.length())); } if (file.exists()&&!file.canWrite()) throw new IOException("Cannot write log file "+file); // Do we need to change the output stream? if (out==null || !file.equals(_file)) { // Yep _file=file; if (!_append && file.exists()) file.renameTo(new File(file.toString()+"."+_fileBackupFormat.format(now))); OutputStream oldOut=out; out=new FileOutputStream(file.toString(),_append); if (oldOut!=null) oldOut.close(); //if(log.isDebugEnabled())log.debug("Opened "+_file); } } /* ------------------------------------------------------------ */ private void removeOldFiles() { if (_retainDays>0) { long now = System.currentTimeMillis(); File file= new File(_filename); File dir = new File(file.getParent()); String fn=file.getName(); int s=fn.toLowerCase().indexOf(YYYY_MM_DD); if (s<0) return; String prefix=fn.substring(0,s); String suffix=fn.substring(s+YYYY_MM_DD.length()); String[] logList=dir.list(); for (int i=0;i<logList.length;i++) { fn = logList[i]; if(fn.startsWith(prefix)&&fn.indexOf(suffix,prefix.length())>=0) { File f = new File(dir,fn); long date = f.lastModified(); if ( ((now-date)/(1000*60*60*24))>_retainDays) f.delete(); } } } } /* ------------------------------------------------------------ */ public void write (byte[] buf) throws IOException { out.write (buf); } /* ------------------------------------------------------------ */ public void write (byte[] buf, int off, int len) throws IOException { out.write (buf, off, len); } /* ------------------------------------------------------------ */ /** */ public void close() throws IOException { synchronized(RolloverFileOutputStream.class) { try{super.close();} finally { out=null; _file=null; } _rollTask.cancel(); } } /* ------------------------------------------------------------ */ /* ------------------------------------------------------------ */ /* ------------------------------------------------------------ */ private class RollTask extends TimerTask { public void run() { try { RolloverFileOutputStream.this.setFile(); RolloverFileOutputStream.this.removeOldFiles(); } catch(IOException e) { e.printStackTrace(); } } } } Other Jetty examples (source code examples)Here is a short list of links related to this Jetty RolloverFileOutputStream.java source code file: |
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