Java SE

Optimized Character Escaper for Java

This specific content was written 10 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.

I wanted to write my own character escaper for requests going to Apache Lucent.
After writing my own, I also received feedback from programmers-stackexchange which resulted in the fastest implementation, also posted here. (Thanks to MrSmit42)

Below is my application that tests 6 different slightly different implementations over 30,000,000 executions each and outputs the time in MS.

The results in MS (on my computer) were the following:

Method 1 (Boolean Array)->    7574
Method 0 (Switch Stmt)->    9778
Method 4 (Switch Stmt Ugly – BreakPoints after evert case)->    12451
Method 6 (HashSet)->    17273
Method 5 (EnumMap)->    39516
Method 3 (Pattern/Regex)->    98229

This proves that for production systems that have many requests, jumping directly on the RegEx bandwagon for even trivial problems is not always the solution.
Even a 0,5 MS reduction per request leads to 50MS saved over 100 requests (per second) and 500MS over 1000 requests.

[polldaddy poll=7418939]

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Data insertion to CouchDB using Lightcouch lib in Java (Sample)

This specific content was written 12 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.

Introduction

Hello, a small sample on how to insert JSON data to couchDB.

First off there are MANY java libraries for accessing couchdb. For information on which one to choose for you the 2 links below may help:
1) http://stackoverflow.com/questions/1105807/which-java-library-libraries-for-couchdb
2) http://wiki.apache.org/couchdb/Getting_started_with_Java

In this post we made use of LightCouch as we wanted something relatively simple without object mappings and other such features.

Aside: an also interesting tutorial utilizing couchdb4j with description of sessions is: http://www.drdobbs.com/jvm/223100116

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