org.apache.log4j.FileAppender Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.log4j;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.io.Writer;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.helpers.QuietWriter;
import org.apache.log4j.spi.ErrorCode;
// Contibutors: Jens Uwe Pipka
// Ben Sandee
/**
* FileAppender appends log events to a file.
*
* Support for java.io.Writer and console appending
* has been deprecated and then removed. See the replacement
* solutions: {@link WriterAppender} and {@link ConsoleAppender}.
*
* @author Ceki Gülcü
* */
public class FileAppender extends WriterAppender {
/** Controls file truncatation. The default value for this variable
* is true, meaning that by default a
* FileAppender will append to an existing file and not
* truncate it.
*
*
This option is meaningful only if the FileAppender opens the
* file.
*/
protected boolean fileAppend = true;
/**
The name of the log file. */
protected String fileName = null;
/**
Do we do bufferedIO? */
protected boolean bufferedIO = false;
/**
* Determines the size of IO buffer be. Default is 8K.
*/
protected int bufferSize = 8*1024;
/**
The default constructor does not do anything.
*/
public
FileAppender() {
}
/**
Instantiate a FileAppender and open the file
designated by filename. The opened filename will
become the output destination for this appender.
If the append parameter is true, the file will be
appended to. Otherwise, the file designated by
filename will be truncated before being opened.
If the bufferedIO parameter is true,
then buffered IO will be used to write to the output file.
*/
public
FileAppender(Layout layout, String filename, boolean append, boolean bufferedIO,
int bufferSize) throws IOException {
this.layout = layout;
this.setFile(filename, append, bufferedIO, bufferSize);
}
/**
Instantiate a FileAppender and open the file designated by
filename. The opened filename will become the output
destination for this appender.
If the append parameter is true, the file will be
appended to. Otherwise, the file designated by
filename will be truncated before being opened.
*/
public
FileAppender(Layout layout, String filename, boolean append)
throws IOException {
this.layout = layout;
this.setFile(filename, append, false, bufferSize);
}
/**
Instantiate a FileAppender and open the file designated by
filename. The opened filename will become the output
destination for this appender.
The file will be appended to. */
public
FileAppender(Layout layout, String filename) throws IOException {
this(layout, filename, true);
}
/**
The File property takes a string value which should be the
name of the file to append to.
Note that the special values
"System.out" or "System.err" are no longer honored.
Note: Actual opening of the file is made when {@link
#activateOptions} is called, not when the options are set. */
public void setFile(String file) {
// Trim spaces from both ends. The users probably does not want
// trailing spaces in file names.
String val = file.trim();
fileName = val;
}
/**
Returns the value of the Append option.
*/
public
boolean getAppend() {
return fileAppend;
}
/** Returns the value of the File option. */
public
String getFile() {
return fileName;
}
/**
If the value of File is not null, then {@link
#setFile} is called with the values of File and
Append properties.
@since 0.8.1 */
public
void activateOptions() {
if(fileName != null) {
try {
setFile(fileName, fileAppend, bufferedIO, bufferSize);
}
catch(java.io.IOException e) {
errorHandler.error("setFile("+fileName+","+fileAppend+") call failed.",
e, ErrorCode.FILE_OPEN_FAILURE);
}
} else {
//LogLog.error("File option not set for appender ["+name+"].");
LogLog.warn("File option not set for appender ["+name+"].");
LogLog.warn("Are you using FileAppender instead of ConsoleAppender?");
}
}
/**
Closes the previously opened file.
*/
protected
void closeFile() {
if(this.qw != null) {
try {
this.qw.close();
}
catch(java.io.IOException e) {
if (e instanceof InterruptedIOException) {
Thread.currentThread().interrupt();
}
// Exceptionally, it does not make sense to delegate to an
// ErrorHandler. Since a closed appender is basically dead.
LogLog.error("Could not close " + qw, e);
}
}
}
/**
Get the value of the BufferedIO option.
BufferedIO will significatnly increase performance on heavily
loaded systems.
*/
public
boolean getBufferedIO() {
return this.bufferedIO;
}
/**
Get the size of the IO buffer.
*/
public
int getBufferSize() {
return this.bufferSize;
}
/**
The Append option takes a boolean value. It is set to
true by default. If true, then File
will be opened in append mode by {@link #setFile setFile} (see
above). Otherwise, {@link #setFile setFile} will open
File in truncate mode.
Note: Actual opening of the file is made when {@link
#activateOptions} is called, not when the options are set.
*/
public
void setAppend(boolean flag) {
fileAppend = flag;
}
/**
The BufferedIO option takes a boolean value. It is set to
false by default. If true, then File
will be opened and the resulting {@link java.io.Writer} wrapped
around a {@link BufferedWriter}.
BufferedIO will significatnly increase performance on heavily
loaded systems.
*/
public
void setBufferedIO(boolean bufferedIO) {
this.bufferedIO = bufferedIO;
if(bufferedIO) {
immediateFlush = false;
}
}
/**
Set the size of the IO buffer.
*/
public
void setBufferSize(int bufferSize) {
this.bufferSize = bufferSize;
}
/**
Sets and opens the file where the log output will
go. The specified file must be writable.
If there was already an opened file, then the previous file
is closed first.
Do not use this method directly. To configure a FileAppender
or one of its subclasses, set its properties one by one and then
call activateOptions.
@param fileName The path to the log file.
@param append If true will append to fileName. Otherwise will
truncate fileName. */
public
synchronized
void setFile(String fileName, boolean append, boolean bufferedIO, int bufferSize)
throws IOException {
LogLog.debug("setFile called: "+fileName+", "+append);
// It does not make sense to have immediate flush and bufferedIO.
if(bufferedIO) {
setImmediateFlush(false);
}
reset();
FileOutputStream ostream = null;
try {
//
// attempt to create file
//
ostream = new FileOutputStream(fileName, append);
} catch(FileNotFoundException ex) {
//
// if parent directory does not exist then
// attempt to create it and try to create file
// see bug 9150
//
String parentName = new File(fileName).getParent();
if (parentName != null) {
File parentDir = new File(parentName);
if(!parentDir.exists() && parentDir.mkdirs()) {
ostream = new FileOutputStream(fileName, append);
} else {
throw ex;
}
} else {
throw ex;
}
}
Writer fw = createWriter(ostream);
if(bufferedIO) {
fw = new BufferedWriter(fw, bufferSize);
}
this.setQWForFiles(fw);
this.fileName = fileName;
this.fileAppend = append;
this.bufferedIO = bufferedIO;
this.bufferSize = bufferSize;
writeHeader();
LogLog.debug("setFile ended");
}
/**
Sets the quiet writer being used.
This method is overriden by {@link RollingFileAppender}.
*/
protected
void setQWForFiles(Writer writer) {
this.qw = new QuietWriter(writer, errorHandler);
}
/**
Close any previously opened file and call the parent's
reset. */
protected
void reset() {
closeFile();
this.fileName = null;
super.reset();
}
}