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BAEL-608 - Introduction to Java9 StackWalking AP #1329

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merged 11 commits into from
Mar 9, 2017
Merged

BAEL-608 - Introduction to Java9 StackWalking AP #1329

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963cc51
yasin.bhojawala@gmail.com
yasin3061 Mar 1, 2017
06b68ce
Revert "yasin.bhojawala@gmail.com"
yasin3061 Mar 4, 2017
db65f0d
Fixing compilation error and removing unused import
yasin3061 Mar 4, 2017
fe2457b
Introduction to Java9 StackWalking API - yasin.bhojawala@gmail.com
yasin3061 Mar 6, 2017
48fa4ad
BAEL-608 Introduction to Java9 StackWalking API
yasin3061 Mar 7, 2017
8c9a043
Merge branch 'master' into master
yasin3061 Mar 7, 2017
7a818dc
BAEL-608 Introduction to Java9 StackWalking API
yasin3061 Mar 8, 2017
a6f1b86
BAEL-608 Introduction to Java9 StackWalking API
yasin3061 Mar 8, 2017
b21286f
BAEL-608 Introduction to Java9 StackWalking API
yasin3061 Mar 8, 2017
3203bc8
BAEL-608 Introduction to Java9 StackWalking API
yasin3061 Mar 8, 2017
8c07c56
Merge remote-tracking branch 'refs/remotes/eugenp/master'
yasin3061 Mar 8, 2017
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44 changes: 32 additions & 12 deletions core-java-9/src/main/java/com/baeldung/java9/stackwalker/StackWalkerDemo.java
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Original file line number Diff line number Diff line change
Expand Up @@ -16,48 +16,68 @@ public void methodTwo() {
}

public void methodThree() {
List<StackFrame> stackTrace = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE)
.walk(StackWalkerDemo::walkExample);
List<StackFrame> stackTrace = StackWalker.getInstance()
.walk(this::walkExample);

printStackTrace(stackTrace);

System.out.println("---------------------------------------------");

stackTrace = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE)
.walk(StackWalkerDemo::walkExample2);
stackTrace = StackWalker.getInstance()
.walk(this::walkExample2);

printStackTrace(stackTrace);

System.out.println("---------------------------------------------");

String line = StackWalker.getInstance()
.walk(StackWalkerDemo::walkExample3);
String line = StackWalker.getInstance().walk(this::walkExample3);
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());
}

private static List<StackFrame> walkExample2(Stream<StackFrame> stackFrameStream) {
public 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) {
public String walkExample3(Stream<StackFrame> stackFrameStream) {
return stackFrameStream.filter(frame -> frame.getClassName()
.contains("com.baeldung")
&& frame.getClassName()
.endsWith("Test"))
.endsWith("Test"))
.findFirst()
.map(frame -> frame.getClassName() + "#" + frame.getMethodName() + ", Line " + frame.getLineNumber())
.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) {
System.out.println(stackFrame.getDeclaringClass()
System.out.println(stackFrame.getClassName()
.toString() + "#" + stackFrame.getMethodName() + ", Line " + stackFrame.getLineNumber());
}
}
Expand Down
7 changes: 6 additions & 1 deletion core-java-9/src/test/java/com/baeldung/java9/stackwalker/StackWalkerDemoTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,12 @@
public class StackWalkerDemoTest {

@Test
public void walkTheStack() {
public void giveStalkWalker_whenWalkingTheStack_thenShowStackFrames() {
new StackWalkerDemo().methodOne();
}

@Test
public void giveStalkWalker_whenInvokingFindCaller_thenFindCallingClass() {
new StackWalkerDemo().findCaller();
}
}