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BAEL-608 - Introduction to Java9 StackWalking API (#1315)

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* yasin.bhojawala@gmail.com

Evaluation article on Different Types of Bean Injection in Spring

* Revert "yasin.bhojawala@gmail.com"

This reverts commit 963cc51a7a.

* Fixing compilation error and removing unused import

* Introduction to Java9 StackWalking API - yasin.bhojawala@gmail.com

Code examples for the article "Introduction to Java9 StackWalking API"
This commit is contained in:
Yasin
2017-03-07 01:28:33 +05:30
committed by maibin
parent f07985b402
commit 7a92909566
2 changed files with 75 additions and 0 deletions
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64
core-java-9/src/main/java/com/baeldung/java9/stackwalker/StackWalkerDemo.java Normal file
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package com.baeldung.java9.stackwalker;
import java.lang.StackWalker.StackFrame;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class StackWalkerDemo {
public void methodOne() {
this.methodTwo();
}
public void methodTwo() {
this.methodThree();
}
public void methodThree() {
List<StackFrame> stackTrace = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE)
.walk(StackWalkerDemo::walkExample);
printStackTrace(stackTrace);
System.out.println("---------------------------------------------");
stackTrace = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE)
.walk(StackWalkerDemo::walkExample2);
printStackTrace(stackTrace);
System.out.println("---------------------------------------------");
String line = StackWalker.getInstance()
.walk(StackWalkerDemo::walkExample3);
System.out.println(line);
}
private static List<StackFrame> walkExample(Stream<StackFrame> stackFrameStream) {
return stackFrameStream.collect(Collectors.toList());
}
private static List<StackFrame> walkExample2(Stream<StackFrame> stackFrameStream) {
return stackFrameStream.filter(frame -> frame.getClassName()
.contains("com.baeldung"))
.collect(Collectors.toList());
}
private static String walkExample3(Stream<StackFrame> stackFrameStream) {
return stackFrameStream.filter(frame -> frame.getClassName()
.contains("com.baeldung")
&& frame.getClassName()
.endsWith("Test"))
.findFirst()
.map(frame -> frame.getClassName() + "#" + frame.getMethodName() + ", Line " + frame.getLineNumber())
.orElse("Unknown caller");
}
private void printStackTrace(List<StackFrame> stackTrace) {
for (StackFrame stackFrame : stackTrace) {
System.out.println(stackFrame.getDeclaringClass()
.toString() + "#" + stackFrame.getMethodName() + ", Line " + stackFrame.getLineNumber());
}
}
}