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BAEL-608 - Introduction to Java9 StackWalking AP (#1329) 

* yasin.bhojawala@gmail.com

Evaluation article on Different Types of Bean Injection in Spring

* Revert "yasin.bhojawala@gmail.com"

This reverts commit 963cc51a7a15b75b550108fe4e198cd65a274032.

* 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"

* BAEL-608 Introduction to Java9 StackWalking API

* BAEL-608 Introduction to Java9 StackWalking API

changing the test names to BDD style

* BAEL-608 Introduction to Java9 StackWalking API

correcting the typo

* BAEL-608 Introduction to Java9 StackWalking API

improving method names

* BAEL-608 Introduction to Java9 StackWalking API

test method names improvements
This commit is contained in:
Yasin 2017-03-09 13:20:23 +05:30 committed by maibin
parent 6ea120d67f
commit 00d42129ef
2 changed files with 38 additions and 13 deletions
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44
core-java-9/src/main/java/com/baeldung/java9/stackwalker/StackWalkerDemo.java
View File

@ -16,48 +16,68 @@ public class StackWalkerDemo {
} }
public void methodThree() { public void methodThree() {
List<StackFrame> stackTrace = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE) List<StackFrame> stackTrace = StackWalker.getInstance()
.walk(StackWalkerDemo::walkExample); .walk(this::walkExample);
printStackTrace(stackTrace); printStackTrace(stackTrace);
System.out.println("---------------------------------------------"); System.out.println("---------------------------------------------");
stackTrace = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE) stackTrace = StackWalker.getInstance()
.walk(StackWalkerDemo::walkExample2); .walk(this::walkExample2);
printStackTrace(stackTrace); printStackTrace(stackTrace);
System.out.println("---------------------------------------------"); System.out.println("---------------------------------------------");
String line = StackWalker.getInstance() String line = StackWalker.getInstance().walk(this::walkExample3);
.walk(StackWalkerDemo::walkExample3);
System.out.println(line); System.out.println(line);
System.out.println("---------------------------------------------");
stackTrace = StackWalker.getInstance(StackWalker.Option.SHOW_REFLECT_FRAMES)
.walk(this::walkExample);
printStackTrace(stackTrace);
System.out.println("---------------------------------------------");
Runnable r = () -> {
List<StackFrame> stackTrace2 = StackWalker.getInstance(StackWalker.Option.SHOW_HIDDEN_FRAMES)
.walk(this::walkExample);
printStackTrace(stackTrace2);
};
r.run();
} }
private static List<StackFrame> walkExample(Stream<StackFrame> stackFrameStream) { public List<StackFrame> walkExample(Stream<StackFrame> stackFrameStream) {
return stackFrameStream.collect(Collectors.toList()); return stackFrameStream.collect(Collectors.toList());
} }
private static List<StackFrame> walkExample2(Stream<StackFrame> stackFrameStream) { public List<StackFrame> walkExample2(Stream<StackFrame> stackFrameStream) {
return stackFrameStream.filter(frame -> frame.getClassName() return stackFrameStream.filter(frame -> frame.getClassName()
.contains("com.baeldung")) .contains("com.baeldung"))
.collect(Collectors.toList()); .collect(Collectors.toList());
} }
private static String walkExample3(Stream<StackFrame> stackFrameStream) { public String walkExample3(Stream<StackFrame> stackFrameStream) {
return stackFrameStream.filter(frame -> frame.getClassName() return stackFrameStream.filter(frame -> frame.getClassName()
.contains("com.baeldung") .contains("com.baeldung")
&& frame.getClassName() && frame.getClassName()
.endsWith("Test")) .endsWith("Test"))
.findFirst() .findFirst()
.map(frame -> frame.getClassName() + "#" + frame.getMethodName() + ", Line " + frame.getLineNumber()) .map(frame -> frame.getClassName() + "#" + frame.getMethodName() + ", Line " + frame.getLineNumber())
.orElse("Unknown caller"); .orElse("Unknown caller");
} }
public void findCaller() {
Class<?> caller = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE).getCallerClass();
System.out.println(caller.getCanonicalName());
}
private void printStackTrace(List<StackFrame> stackTrace) { public void printStackTrace(List<StackFrame> stackTrace) {
for (StackFrame stackFrame : stackTrace) { for (StackFrame stackFrame : stackTrace) {
System.out.println(stackFrame.getDeclaringClass() System.out.println(stackFrame.getClassName()
.toString() + "#" + stackFrame.getMethodName() + ", Line " + stackFrame.getLineNumber()); .toString() + "#" + stackFrame.getMethodName() + ", Line " + stackFrame.getLineNumber());
} }
} }

7
core-java-9/src/test/java/com/baeldung/java9/stackwalker/StackWalkerDemoTest.java
View File

@ -5,7 +5,12 @@ import org.junit.Test;
public class StackWalkerDemoTest { public class StackWalkerDemoTest {
@Test @Test
public void walkTheStack() { public void giveStalkWalker_whenWalkingTheStack_thenShowStackFrames() {
new StackWalkerDemo().methodOne(); new StackWalkerDemo().methodOne();
} }
@Test
public void giveStalkWalker_whenInvokingFindCaller_thenFindCallingClass() {
new StackWalkerDemo().findCaller();
}
} }