Mohammad Masudur Rahman , Shamima Yeasmin, and Chanchal K. Roy Department of Computer Science

TOWARDS A CONTEXT-AWARE META SEARCH ENGINE FOR IDE-BASED RECOMMENDATION ABOUT PROGRAMMING ERRORS & EXCEPTIONS

Mohammad Masudur Rahman, Shamima Yeasmin, and Chanchal K. Roy

Department of Computer Science

University of Saskatchewan

CSMR-18/WCRE-21 Software Evolution Week (SEW 2014), Antwerp, Belgium

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SOFTWARE MAINTENANCE, BUGS & EXCEPTIONS

A common experience!!

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EXCEPTION HANDLING: IDE SUPPORT

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EXCEPTION SEARCH QUERY

Class can not access a member of class java.util.HashMap$HashIterator with modifiers "public final”

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EXCEPTION HANDLING: WEB SEARCH

Traditional web search•No ties between IDE and web browsers•Does not consider problem-context•Environment-switching is distracting & Time consuming•Often not much productive (trial & error approach)

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IDE-BASED WEB SEARCH

About 80% effort on Software Maintenance,(Ponzanelli et al, ICSE 2013)

Bug fixation– error and exception handling Developers spend about 19% of time in web

search, (Brandt et al, SIGCHI, 2009)

o IDE-Based context-aware web search is the right choice

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EXISTING RELATED WORKS

Rahman et al. (WCRE 2013) ERA version of this paper Outlines basic idea, limited experiments

Cordeiro et al. (RSSE 2012) Based on StackOverflow data dump Subject to the availability of the dump, not easily

updatable Uses limited context, only stack trace Very limited experiments

Ponzanelli et al. (ICSE 2013) Based on StackOverflow data dump Uses limited context, only context-code Not specialized for exception handling

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EXISTING RELATED WORKS

Poshyvanyk et al. (IWICSS 2007) Integrates Google Desktop in the IDE Not context-aware

Brandt et al. (SIGCHI 2010) Integrates Google web search into IDE Not context-aware Focused on usability analysis

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MOTIVATION EXPERIMENTS

Search Query

Common for All

Google Unique

Yahoo Unique

Bing Unique

Content Only

32 09 16 18

Content and Context

47 09 11 10

75 Exceptions (details later) Individual engine can provide solutions for 58

exceptions at most. Maximizing total solutions

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THE KEY IDEA !! META SEARCH ENGINE

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PROPOSED IDE-BASED META SEARCH MODEL

Start search

Results

Web page

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PROPOSED IDE-BASED META SEARCH MODEL

Distinguished Features (5) IDE-Based solution

Web search, search result and web browsing all from IDE No context-switching needed

Meta search engine Captures data from multiple search engines Also applies custom ranking techniques

Context-Aware search Uses stack traces information Uses context-code (surroundings of exception locations)

Software As A Service (SAAS) Search is provided as a web service, and can be

leveraged by an IDE. http://srlabg53-2.usask.ca/wssurfclipse/

PROPOSED IDE-BASED META SEARCH MODEL

Two Working Modes Proactive Mode

Auto-detects the occurrence of an exception Initiates search for exception by client itself Aligned with Cordeiro et al. (RSSE’ 2012) & Ponzanelli et

al. (ICSE 2013)

Interactive Mode Developer starts search using context menu Also facilitates keyword-based search Aligned with traditional web search within the IDE

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SEARCH QUERY GENERATION

Search Query required to collect results from the Search Engine APIs and to develop the corpus.

Query generation Uses stack trace and Context code Collects 5 tokens of top-most degree of

interests from stack trace. Collects 5 most frequently invoked methods

in the context-code. Combined both token list to form the

recommended keywords for the context.

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RESULT RANKING ASPECTS (4)

Content-Relevance Considers page title, body content against search query

Context-Relevance Considers stack traces from webpage against target stack

trace Considers code snippets against context-code extracted

from IDE

Link Popularity Considers the Alexa & Compete site rank Estimates a normalized score from those ranks

Search Engine Confidence Heuristic measure of confidence for the result Considers the frequency of occurrence Considers the weight of each search engine

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PROPOSED METRICS & SCORES

Content Matching Score (Scms) Cosine similarity based measurement

Stack trace Matching Score (Sstm) Structural and lexical similarity measurement of

stack traces

Code context Matching Score (Sccx) Code snippet similarity (code clones)

StackOverflow Vote Score (Sso) Total votes for all posts in the SO result link

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PROPOSED METRICS & SCORES

Site Traffic Rank Score (Sstr)-- Alexa and Compete Rank of each link

Search Engine weight (Ssew)---Relative reliability or importance of each search engine. Experiments with 75 programming queries against the search engines.

Heuristic weights of the metrics are determined through controlled experiments.

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EXPERIMENT OVERVIEW

75 Exceptions collected from Eclipse IDE workspaces of grad-students of SR Lab, U of S, and different online sources (StackOverflow, pastebin)

Related to Eclipse plug-in framework and Java Application Development

Solutions chosen from exhaustive web search with cross validations by peers

Recommended results manually validated. Results compared against existing

approaches and search engines.

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PERFORMANCE METRICS

Mean Precision (MP) Recall (R) Mean First False Positive Position (MFFP) Mean Reciprocal Rank (MRR)

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RESULTS FOR SCORE COMPONENTSScore Components

Metrics Proactive Mode (Top 30)

Interactive Mode (Top 30)

Content MPTEFR

0.037156 (75)74.66%

0.048165 (75)86.66%

Content +Context

MPTEFR

0.037655 (75)73.33%

0.051466 (75)88.00%

Content + Context + Popularity

MPTEFR

0.038156 (75)74.66%

0.051966 (75)88.00%

Content +Context + Popularity +Confidence

MPTEFR

0.038056 (75)74.66%

0.053868 (75)90.66%

[ MP = Mean Precision, R = Recall, TEF= Total Exceptions Fixed]

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RESULTS OF EXISTING APPROACHES

Recommender Metrics Top 10 Top 20 Top 30

Cordeiro et al. (only stack traces)

MPTEFR

0.020215 (75)20.00%

0.012818 (75)24.00%

0.008518 (75)24.00%

Proposed Method (Proactive Mode)

MPTEFR

0.088651 (75)68.00%

0.052955 (75)73.33%

0.038056 (75)74.66%

Ponzanelli et al. (only context-code)

MPTEFR

0.02437 (37)18.92%

0.01357 (37)18.92%

0.00997 (37)18.92%

Proposed Method (Proactive Mode)

MPTEFR

0.100030 (37)81.08%

0.062132 (37)86.48%

0.045032 (37)86.48%

[ MP = Mean Precision, R = Recall, TEF= Total Exceptions Fixed]

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RESULTS OF SEARCH ENGINESSearch Engine Metrics Top 10 Top 20 Top 30

Google MPTEFR

0.157157 (75)76.00%

0.086457 (75)76.00%

0.058057 (75)76.00%

Bing MPTEFR

0.101355 (75)73.33%

0.053358 (75)77.33%

0.036458 (75)77.33%

Yahoo MPTEFR

0.098654 (75)72.00%

0.053957 (75)76.00%

0.036957 (75)76.00%

StackOverflow Search

MPTEFR

0.022614 (75)18.66%

0.014017 (75)22.66%

0.009717 (75)22.66%

Proposed Method (Interactive mode)

MPTEFR

0.122959 (75)78.66%

0.073664 (75)85.33%

0.053868 (75)90.66%

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THREATS TO VALIDITY

Search not real time yet, generally takes about 20-25 seconds per search. Multithreading used, extensive parallel processing needed.

Search engines constantly evolving, same results may not be produced at later time.

Experimented with common exceptions, which are widely discussed and available in the web.

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LATEST UPDATES

More extensive experiments with 150 exceptions. Achieved 92% accuracy.

Eclipse plugin release (https://marketplace.eclipse.org/content/surfclipse)

Context-aware Keyword search with automatic query completion feature.

Visual Studio 2012 Plugin under development.

Extensive User Study ongoing.

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SURFCLIPSE TOOL DEMONSTRATION

Tool Demo video: https://www.youtube.com/watch?v=hGbyF4YveaI

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THANK YOU !!!

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REFERENCES[1] M.M. Rahman, S.Y. Mukta, and C.K. Roy. An IDE-Based Context-

Aware Meta Search Engine. In Proc. WCRE, pages 467–471, 2013.

[2] J. Cordeiro, B. Antunes, and P. Gomes. Context-based Recommendation to Support Problem Solving in Software Development. In Proc. RSSE, pages 85 –89, June 2012.

[3] L. Ponzanelli, A. Bacchelli, and M. Lanza. Seahawk: StackOverflow in the IDE. In Proc. ICSE, pages 1295–1298, 2013.

[4] D. Poshyvanyk, M. Petrenko, and A. Marcus. Integrating COTS Search Engines into Eclipse: Google Desktop Case Study. In Proc. IWICSS, pages 6–, 2007.

[5] J. Brandt, P. J. Guo, J. Lewenstein, M. Dontcheva, and S. R. Klemmer. Two Studies of Opportunistic Programming: Interleaving Web Foraging, Learning, and Writing Code. In Proc. SIGCHI, pages 1589–1598, 2009.

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SAMPLE STACK TRACEjava.net.ConnectException: Connection refused: connectat java.net.DualStackPlainSocketImpl.connect0(Native Method)at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)at java.net.AbstractPlainSocketImpl.connect(Unknown Source)at java.net.PlainSocketImpl.connect(Unknown Source)at java.net.SocksSocketImpl.connect(Unknown Source)at java.net.Socket.connect(Unknown Source)at java.net.Socket.connect(Unknown Source)at java.net.Socket.<init>(Unknown Source)at java.net.Socket.<init>(Unknown Source)at test.SockTest.main(SockTest.java:13)

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SAMPLE CONTEXT CODE

try {Socket client = new Socket("localhost", 4321);ObjectOutputStream out = new ObjectOutputStream(client.getOutputStream());out.flush();ObjectInputStream in = new ObjectInputStream(client.getInputStream());System.out.println("Buffer size: " + client.getSendBufferSize());for (int i = 0; i < 10; i++) {

if (i == 3) {Thread.currentThread().interrupt();System.out.println("Interrupted.");}out.writeObject("From Client: Hellow." + i);out.flush();System.out.println(in.readObject());}} catch (Exception e) {e.printStackTrace();}

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SEARCH QUERY FOR CORPUS DEVELOPMENT

java.net.ConnectException Connection refused connect currentThread

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ITEMS USED FOR RELEVANCE CHECKING

java.net.ConnectException Connection refused connect currentThread+Sample Stack Trace+Sample Context Code

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SAMPLE STACK TRACE (2)

java.lang.ClassNotFoundException: org.sqlite.JDBCat java.net.URLClassLoader$1.run(Unknown Source)at java.net.URLClassLoader$1.run(Unknown Source)at java.security.AccessController.doPrivileged(Native Method)at java.net.URLClassLoader.findClass(Unknown Source)at java.lang.ClassLoader.loadClass(Unknown Source)at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)at java.lang.ClassLoader.loadClass(Unknown Source)at java.lang.Class.forName0(Native Method)at java.lang.Class.forName(Unknown Source)at core.ANotherTest.main(ANotherTest.java:18)

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CONTEXT CODE (2)

try{//code for making connection with a sqlite databaseClass.forName("org.sqlite.JDBC");Connection connection=null;connection=DriverManager.getConnection("jdbc:sqlite:"+"/"+"test.db");Statement statement=connection.createStatement();String create_query="create table History ( LinkID INTEGER primary key, Title TEXT not null, LinkURL TEXT not null);";boolean created=statement.execute(create_query);System.out.println("Succeeded");}catch(Exception exc){exc.printStackTrace();}

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SEARCH QUERY FOR CORPUS DEVELOPMENT

java.lang.ClassNotFoundException org.sqlite.JDBC db ClassLoader execute

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ITEMS USED FOR RELEVANCE CHECKING

java.lang.ClassNotFoundException org.sqlite.JDBC db ClassLoader execute +Sample Stack Trace+Sample Context Code