Package ua_parser

Class CachingParser

java.lang.Object

ua_parser.Parser

ua_parser.CachingParser

public class CachingParser
extends Parser

When doing webanalytics (with for example PIG) the main pattern is to process weblogs in clickstreams. A basic fact about common clickstreams is that in general the same browser will do multiple requests in sequence. This has the effect that the same useragent will appear in the logfiles and we will see the need to parse the same useragent over and over again. This class introduces a very simple LRU cache to reduce the number of times the parsing is actually done. The default cache size is 1000 and can be configured as object creation. Note: The object handles one cache per parsing method - be carefull when using big sizes.

Author:

Niels Basjes

Field Summary

Fields inherited from class ua_parser.Parser

CODE_POINT_LIMIT

Constructor Summary

Constructors

Constructor	Description
CachingParser()
CachingParser(int cacheSize)
CachingParser(InputStream regexYaml)
CachingParser(InputStream regexYaml, int cacheSize)

Method Summary

Modifier and Type	Method	Description
Client	parse(String agentString)
Device	parseDevice(String agentString)
OS	parseOS(String agentString)
UserAgent	parseUserAgent(String agentString)

Methods inherited from class ua_parser.Parser

getDefaultLoaderOptions

Methods inherited from class java.lang.Object

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

Constructor Details

CachingParser

public CachingParser()

CachingParser

public CachingParser(InputStream regexYaml)

CachingParser

public CachingParser(int cacheSize)

CachingParser

public CachingParser(InputStream regexYaml,
 int cacheSize)

Method Details

parse

public Client parse(String agentString)

Overrides:

parse in class Parser

parseUserAgent

public UserAgent parseUserAgent(String agentString)

Overrides:

parseUserAgent in class Parser

parseDevice

public Device parseDevice(String agentString)

Overrides:

parseDevice in class Parser

parseOS

public OS parseOS(String agentString)

Overrides:

parseOS in class Parser