HATARI: Raising Risk Awareness

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Demonstrated at ESEC/FSE 2005.

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HATARI: Raising Risk Awareness

  1. 1. Movie with John Wayne (1962) Swahili for “Danger” HATARI Raising Risk Awareness Jacek Sliwerski, Thomas Zimmermann, and Andreas Zeller Saarland University
  2. 2. What is Risk?
  3. 3. resolveClasspath() /* (non-Javadoc) * @see org.eclipse.jdt.launching.IRuntimeClasspathProvider#resolveClasspath * (org.eclipse.jdt.launching.IRuntimeClasspathEntry[], org.eclipse.debug.core.ILaunchConfiguration) */ public IRuntimeClasspathEntry[] resolveClasspath(IRuntimeClasspathEntry[] entries, ILaunchConfiguration configuration) throws CoreException { List all = new ArrayList(entries.length); for (int i = 0; i < entries.length; i++) { switch (entries[i].getType()) { case IRuntimeClasspathEntry.PROJECT: // a project resolves to itself for source lookup (rather than the class file output locations) 9 changes, all.add(entries[i]); break; case IRuntimeClasspathEntry.OTHER: all of them fixes IRuntimeClasspathEntry2 entry = (IRuntimeClasspathEntry2)entries[i]; if (entry.getTypeId().equals(DefaultProjectClasspathEntry.TYPE_ID)) { // add the resolved children of the project 8 fix-inducing changes IRuntimeClasspathEntry[] children = entry.getRuntimeClasspathEntries(configuration); IRuntimeClasspathEntry[] res = JavaRuntime.resolveSourceLookupPath(children, configuration); one re-implementation for (int j = 0; j < res.length; j++) { all.add(res[j]); } } break; default: IRuntimeClasspathEntry[] resolved =JavaRuntime.resolveRuntimeClasspathEntry(entries[i], configuration); for (int j = 0; j < resolved.length; j++) { all.add(resolved[j]); } break; } } return (IRuntimeClasspathEntry[])all.toArray(new IRuntimeClasspathEntry[all.size()]); }
  4. 4. Fix-Inducing Changes Fix-Inducing Changes are Changes that lead to problems as indicated by later fixes. Later: Example: ... ... if (foo==null) { if (foo!=null) { foo.bar(); foo.bar(); FIX-INDUCING FIX
  5. 5. How to Locate Fix-Inducing Changes
  6. 6. How to Locate Fix-Inducing Changes $ cvs annotate -r 1.17 Foo.java ... 19: 1.11 (john 12-Feb-03): public int a() { 20: 1.11 (john 12-Feb-03): return i/0; ... 39: 1.10 (mary 12-Jan-03): public int b() { 40: 1.14 (kate 23-May-03): return 42; ... 59: 1.10 (mary 17-Jan-03): public void c() { 60: 1.16 (mary 10-Jun-03): int i=0; 1.18 Fixed Bug 42233 Changed: a() b() c() line 20 40 60
  7. 7. How to Locate Fix-Inducing Changes $ cvs annotate -r 1.17 Foo.java 20: 1.11 (john 12-Feb-03): return i/0; 40: 1.14 (kate 23-May-03): return 42; 60: 1.16 (mary 10-Jun-03): int i=0; 1.11 1.14 1.16 1.18 a() was b() was c() was Fixed Bug changed changed changed 42233 Changed: FIX-INDUCING FIX-INDUCING FIX-INDUCING a() b() c()
  8. 8. How to Locate Fix-Inducing Changes $ cvs annotate -r 1.17 Foo.java 20: 1.11 (john 12-Feb-03): return i/0; 40: 1.14 (kate 23-May-03): return 42; 60: 1.16 (mary 10-Jun-03): int i=0; Bug 42233 was reported. closed. 1.11 1.14 1.16 1.18 a() was b() was c() was Fixed Bug changed changed changed 42233 Changed: FIX-INDUCING FIX-INDUCING FIX-INDUCING a() b() c() REMOVE FALSE POSITIVES
  9. 9. A Measure for Risk based on Fix-Inducing Changes risk(L) is the (past) risk for a location L “BAD” Changes # Fix-Inducing Changes to L risk(L) = # Changes to L
  10. 10. How to Predict Future Risk 0.5 0.4 0.3 Correlation 0.2 0.1 0 0 1 2 3 4 5 6 7 8 9 10 Number of upcoming changes
  11. 11. How to Predict Future Risk 0.5 McCabe Cyclomatic Complexity 0.4 0.3 Correlation 0.2 0.1 0 0 1 2 3 4 5 6 7 8 9 10 Number of upcoming changes
  12. 12. How to Predict Future Risk 0.5 Nested Block Depth McCabe Cyclomatic Complexity 0.4 0.3 Correlation 0.2 0.1 0 0 1 2 3 4 5 6 7 8 9 10 Number of upcoming changes
  13. 13. How to Predict Future Risk 0.5 Past Risk Nested Block Depth McCabe Cyclomatic Complexity 0.4 0.3 Correlation 0.2 0.1 0 0 1 2 3 4 5 6 7 8 9 10 Number of upcoming changes
  14. 14. Demo: HATARI
  15. 15. HATARI: Risky Locations Granularities Past Risk Location Values
  16. 16. HATARI: Annotations “Safe” Location (green) Risky Location (dark red)
  17. 17. HATARI: Risk History Bug, fix, or both? Change information Bug information
  18. 18. Conclusion Fix-inducing changes are a measure for (past) risk. HATARI makes risk visible for developers. HATARI will be open source (Nov 1) http://www.st.cs.uni-sb.de/softevo/

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