com.hotels.styx.api.common.StackDump Maven / Gradle / Ivy
/*
Copyright (C) 2013-2018 Expedia Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.hotels.styx.api.common;
import java.util.stream.Stream;
import static java.lang.String.format;
import static java.lang.System.lineSeparator;
import static java.lang.Thread.currentThread;
import static java.util.stream.Collectors.joining;
/**
* Useful for debugging.
*/
public final class StackDump {
private static final String LINE_SEPARATOR = lineSeparator();
private StackDump() {
}
public static Stream stack() {
return Stream.of(currentThread().getStackTrace())
.map(Object::toString)
.filter(StackDump::notFromThisClass)
.filter(StackDump::notFromThreadClass);
}
public static String string(Stream stack) {
return stack
.map(stackTraceElement -> " at " + stackTraceElement)
.collect(joining(LINE_SEPARATOR));
}
public static void dump(Stream stack) {
System
.out
.println(string(stack));
}
public static void dump(Stream stack, String prefix, Object... args) {
System
.out
.println(format(prefix, args) + LINE_SEPARATOR + string(stack));
}
private static boolean notFromThisClass(String stackTraceElement) {
return !stackTraceElement.contains(StackDump.class.getName());
}
private static boolean notFromThreadClass(String stackTraceElement) {
return !stackTraceElement.contains(Thread.class.getName());
}
}