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modified: classes/logstreamdisk.class.php

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Improved reading from file using a buffer
Backwards reading is not yet implemented
This commit is contained in:
Michael Meckelein 2008-03-11 11:34:07 +01:00
parent f3c85a21e5
commit a15b0c57f5
1 changed files with 24 additions and 32 deletions
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56
classes/logstreamdisk.class.php
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@ -18,11 +18,13 @@ if ( !defined('IN_PHPLOGCON') )
*/
class LogStreamDisk extends LogStream {
private $_currentOffset = -1;
private $_currentStartPos = -1;
private $_fp = null;
private $_bEOF = false;
const _BUFFER_LENGHT = 4096;
private $_buffer = false;
private $_buffer_lenght = -1;
private $_p_buffer = -1;
// cache for backwards reading
@ -45,13 +47,17 @@ class LogStreamDisk extends LogStream {
if(!file_exists($this->_logStreamConfigObj->FileName)) {
return ERROR_FILE_NOT_FOUND;
}
$this->_fp = fopen($this->_logStreamConfigObj->FileName, 'r');
if ($bStartAtEOF) {
fseek($this->_fp, 0, SEEK_END);
}
$this->_currentOffset = ftell($this->_fp);
$this->_currentStartPos = $this->_currentOffset;
$this->_arrProperties = $arrProperties;
// init read
$this->ReadNextBlock();
return SUCCESS;
}
@ -69,8 +75,9 @@ class LogStreamDisk extends LogStream {
}
public function ReadNextBlock() {
echo 'in ReadNextBlock<br />';
//echo 'in ReadNextBlock<br />';
$this->_buffer = fread($this->_fp, self::_BUFFER_LENGHT);
$this->_buffer_lenght = strlen($this->_buffer);
$this->_p_buffer = 0;
if ($this->_buffer == false)
@ -124,43 +131,28 @@ class LogStreamDisk extends LogStream {
private function ReadNextForwards(&$uID, &$logLine) {
if ($this->bEOF) {
return ERROR_FILE_BOF;
return ERROR_FILE_EOF;
}
if (($this->_p_buffer == sizeof($this->_buffer)) && ($this->ReadNextBlock() != SUCCESS)) {
if (($this->_p_buffer == $this->_buffer_lenght) && ($this->ReadNextBlock() != SUCCESS)) {
return ERROR_UNDEFINED;
}
$line = '';
do {
$pos = $this->_p_buffer;
do {
$ch = $this->_buffer[$pos];
switch ($ch) {
case '\r':
case '\n':
$startPosOfLine = $this->_currentOffset - sizeof($line);
$this->_p_buffer = $pos + 1;
$this->_currentOffset++;
if ((($ch == '\r') && (($this->_p_buffer < sizeof($this->_buffer)) || ($this->ReadNextBlock() != SUCCESS))) && ($this->_p_buffer[$this->_p_buffer] == '\n')) {
$this->_p_buffer++;
$this->_currentOffset++;
}
// here a new line starts
$uID = $startPosOfLine;
$logLine = $line;
return SUCCESS;
case '\0':
$this->bEOF = true;
$uID = $this->_currentOffset - sizeof($line);
$logLine = $line;
return SUCCESS;
}
$line .= $ch;
$pos++;
$this->_currentOffset++;
} while ($pos < sizeof($this->_buffer));
$pos = -1;
if (($pos = strpos($this->_buffer, "\n", $this->_p_buffer)) !== false) {
$logLine = $line . substr($this->_buffer, $this->_p_buffer, $pos - $this->_p_buffer);
$this->_currentOffset = $pos - $this->_p_buffer + 1;
$this->_p_buffer = $pos + 1;
$uID = $this->_currentStartPos;
$this->_currentStartPos = $this->_currentOffset;
return SUCCESS;
}
$line .= substr($this->_buffer, $this->_p_buffer, $this->_buffer_lenght - $this->_p_buffer);
$this->_currentOffset += $this->_buffer_lenght - $this->_p_buffer;
} while ($this->ReadNextBlock() == SUCCESS);
return ERROR_UNDEFINED;