Class AbstractAccessLogValve.DateFormatCache

java.lang.Object

org.apache.catalina.valves.AbstractAccessLogValve.DateFormatCache

Enclosing class:

AbstractAccessLogValve

protected static class AbstractAccessLogValve.DateFormatCache
extends Object

Cache structure for formatted timestamps based on seconds.

The cache consists of entries for a consecutive range of seconds. The length of the range is configurable. It is implemented based on a cyclic buffer. New entries shift the range.

There is one cache for the CLF format (the access log standard format) and a HashMap of caches for additional formats used by SimpleDateFormat.

Although the cache supports specifying a locale when retrieving a formatted timestamp, each format will always use the locale given when the format was first used. New locales can only be used for new formats. The CLF format will always be formatted using the locale en_US.

The cache is not threadsafe. It can be used without synchronization via thread local instances, or with synchronization as a global cache.

The cache can be created with a parent cache to build a cache hierarchy. Access to the parent cache is threadsafe.

This class uses a small thread local first level cache and a bigger synchronized global second level cache.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	AbstractAccessLogValve.DateFormatCache.Cache	Cache for formatted timestamps.

Field Summary

Fields

Modifier and Type	Field	Description
protected final AbstractAccessLogValve.DateFormatCache.Cache	cLFCache	The cache for CLF format.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DateFormatCache(int size, Locale loc, AbstractAccessLogValve.DateFormatCache parentFC)	Creates a new date format cache.

Method Summary

Modifier and Type	Method	Description
String	getFormat(long time)	Gets the formatted timestamp in CLF format.
String	getFormat(String format, Locale loc, long time)	Gets the formatted timestamp in the given format.

Methods inherited from class Object

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

Field Details

cLFCache

protected final AbstractAccessLogValve.DateFormatCache.Cache cLFCache

The cache for CLF format.

Constructor Details

DateFormatCache

protected DateFormatCache(int size,
 Locale loc,
 AbstractAccessLogValve.DateFormatCache parentFC)

Creates a new date format cache.

Parameters:

size - The cache size

loc - The default locale

parentFC - The parent cache

Method Details

getFormat

public String getFormat(long time)

Gets the formatted timestamp in CLF format.

Parameters:

time - The time in milliseconds

Returns:

The formatted timestamp

getFormat

public String getFormat(String format,
 Locale loc,
 long time)

Gets the formatted timestamp in the given format.

Parameters:

format - The format string

loc - The locale

time - The time in milliseconds

Returns:

The formatted timestamp