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Re: Tailing a series of log files

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From	JLP <JLP@jlp.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: Tailing a series of log files
Date	Sat, 15 Jun 2013 19:15:20 +0200
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Le 15/06/2013 18:59, JLP a écrit :
> Le 15/06/2013 15:20, Eric Sosman a écrit :
>> On 6/15/2013 12:11 AM, Daniel Pitts wrote:
>>> On 6/14/13 6:06 PM, Eric Sosman wrote:
>>>> On 6/14/2013 7:00 PM, Arved Sandstrom wrote:
>>>>> On 06/12/2013 09:04 AM, SamXiao wrote:
>>>>>> Hi all,
>>>>>>
>>>>>> I am working on a solution to keep track of a series of log files and
>>>>>> read the tail lines. At the very beginning, there is only one log
>>>>>> file
>>>>>> named “TEST-YYYYMMDD-00.log” (where YYYYMMDD is the current date).
>>>>>> When the size of this log reaches to 10 MB, another log file
>>>>>> “TEST-YYYYMMDD-01.log” will be generated and so forth. After midnight
>>>>>> (12:00), a new log file with the next date starting with 00 again
>>>>>> will
>>>>>> be generated.
>>>>>>
>>>>>> I know Apache Commons IO containing tail.java. However, seems it is
>>>>>> for tailing a single log file only. How could I keep tailing a series
>>>>>> of log files?
>>>>>>
>>>>
> [SNIP because of NNTP server]
>>
> if I understand the OP requirements, a solution may be the pattern
> Observer/Observable :
> - a thread Observable  that follows   the creation of file
> TEST-[\d]{6}(-[^\.])?.log . When a new file is created motify the thread
> Observer with the new file log
> - a thread Observer subscribed to the Observable   that tails the last
> file log and rotate when notified
> http://en.wikipedia.org/wiki/Observer_pattern
>
oops correct pattern for the name of the file is :
TEST-[\d]{8}-\d\d+\.log => the Class File gives the  date of the last 
modification  =>  File.lastmodified(); putting files in a TreeSet with a 
Comparator craeted with the lasModified date.

Thread

Tailing a series of log files SamXiao <foolsmart2005@gmail.com> - 2013-06-12 05:04 -0700
  Re: Tailing a series of log files Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-06-12 08:56 -0400
  Re: Tailing a series of log files Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-14 20:00 -0300
    Re: Tailing a series of log files Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-06-14 21:06 -0400
      Re: Tailing a series of log files Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2013-06-14 21:11 -0700
        Re: Tailing a series of log files Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-06-15 09:20 -0400
          Re: Tailing a series of log files JLP <JLP@jlp.com> - 2013-06-15 18:59 +0200
            Re: Tailing a series of log files JLP <JLP@jlp.com> - 2013-06-15 19:15 +0200
      Re: Tailing a series of log files Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-16 16:43 -0300

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