Package edu.wisc.ssec.mcidasv.util

Class TailFriendlyRollingPolicy<E>

java.lang.Object

ch.qos.logback.core.spi.ContextAwareBase

ch.qos.logback.core.rolling.RollingPolicyBase

ch.qos.logback.core.rolling.TimeBasedRollingPolicy<E>

edu.wisc.ssec.mcidasv.util.TailFriendlyRollingPolicy<E>

All Implemented Interfaces:

ch.qos.logback.core.rolling.RollingPolicy, ch.qos.logback.core.rolling.TriggeringPolicy<E>, ch.qos.logback.core.spi.ContextAware, ch.qos.logback.core.spi.LifeCycle

public class TailFriendlyRollingPolicy<E>
extends ch.qos.logback.core.rolling.TimeBasedRollingPolicy<E>

This Logback "rolling policy" copies the contents of a log file (in this case, mcidasv.log) to the specified destination, and then "zeroes out" the original log file. This approach allows McIDAS-V users to run a command like "tail -f mcidasv.log" without any issue. Even on Windows.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) Future<?>	future

Fields inherited from class ch.qos.logback.core.rolling.TimeBasedRollingPolicy

totalSizeCap

Fields inherited from class ch.qos.logback.core.rolling.RollingPolicyBase

compressionMode, fileNamePatternStr

Fields inherited from class ch.qos.logback.core.spi.ContextAwareBase

context

Constructor Summary

Constructors

Constructor	Description
TailFriendlyRollingPolicy()

Method Summary

Modifier and Type	Method	Description
(package private) Future<?>	asyncCompress(String uncompressedPath, String compressedPath, String innerEntryName)
private static boolean	isFileEmpty(String filepath)	Determine if the file at the given path is zero length.
void	renameByCopying(String src, String target)	Copies the contents of src into target, and then "zeroes out" src.
(package private) Future<?>	renamedRawAndAsyncCompress(String nameOfCompressedFile, String innerEntryName)
void	rollover()

Methods inherited from class ch.qos.logback.core.rolling.TimeBasedRollingPolicy

getActiveFileName, getMaxHistory, getTimeBasedFileNamingAndTriggeringPolicy, isCleanHistoryOnStart, isTriggeringEvent, isUnboundedTotalSizeCap, setCleanHistoryOnStart, setMaxHistory, setTimeBasedFileNamingAndTriggeringPolicy, setTotalSizeCap, start, stop, toString

Methods inherited from class ch.qos.logback.core.rolling.RollingPolicyBase

determineCompressionMode, getCompressionMode, getFileNamePattern, getParentsRawFileProperty, isParentPrudent, isStarted, setFileNamePattern, setParent

Methods inherited from class ch.qos.logback.core.spi.ContextAwareBase

addError, addError, addInfo, addInfo, addStatus, addWarn, addWarn, getContext, getDeclaredOrigin, getStatusManager, setContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface ch.qos.logback.core.spi.LifeCycle

isStarted

Field Details

future

Future<?> future

Constructor Details

TailFriendlyRollingPolicy

public TailFriendlyRollingPolicy()

Method Details

rollover

public void rollover()
              throws ch.qos.logback.core.rolling.RolloverFailure

Specified by:

rollover in interface ch.qos.logback.core.rolling.RollingPolicy

Overrides:

rollover in class ch.qos.logback.core.rolling.TimeBasedRollingPolicy<E>

Throws:

ch.qos.logback.core.rolling.RolloverFailure

asyncCompress

Future<?> asyncCompress(String uncompressedPath,
 String compressedPath,
 String innerEntryName)
                 throws ch.qos.logback.core.rolling.RolloverFailure

Throws:

ch.qos.logback.core.rolling.RolloverFailure

renamedRawAndAsyncCompress

Future<?> renamedRawAndAsyncCompress(String nameOfCompressedFile,
 String innerEntryName)
                              throws ch.qos.logback.core.rolling.RolloverFailure

Throws:

ch.qos.logback.core.rolling.RolloverFailure

renameByCopying

public void renameByCopying(String src,
 String target)
                     throws ch.qos.logback.core.rolling.RolloverFailure

Copies the contents of src into target, and then "zeroes out" src.

Parameters:

src - Path to the file to be copied. Cannot be null.

target - Path to the destination file. Cannot be null.

Throws:

ch.qos.logback.core.rolling.RolloverFailure - if copying failed.

isFileEmpty

private static boolean isFileEmpty(String filepath)

Determine if the file at the given path is zero length.

Parameters:

filepath - Path to the file to be tested. Cannot be null.

Returns:

true if filepath exists and is empty.