org.springframework.boot.LoggedExceptionHandler Maven / Gradle / Ivy
/*
* Copyright 2012-2015 the original author or authors.
*
* 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 org.springframework.boot;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;
/**
* {@link UncaughtExceptionHandler} to suppress handling already logged exceptions.
*
* @author Phillip Webb
*/
class LoggedExceptionHandler implements UncaughtExceptionHandler {
private static LoggedExceptionHandlerThreadLocal handler = new LoggedExceptionHandlerThreadLocal();
private final UncaughtExceptionHandler parent;
private final List exceptions = new ArrayList();
LoggedExceptionHandler(UncaughtExceptionHandler parent) {
this.parent = parent;
}
public void register(Throwable exception) {
this.exceptions.add(exception);
}
@Override
public void uncaughtException(Thread thread, Throwable ex) {
try {
if (!isRegistered(ex) && this.parent != null) {
this.parent.uncaughtException(thread, ex);
}
}
finally {
this.exceptions.clear();
}
}
private boolean isRegistered(Throwable ex) {
if (this.exceptions.contains(ex)) {
return true;
}
if (ex instanceof InvocationTargetException) {
return isRegistered(ex.getCause());
}
return false;
}
static LoggedExceptionHandler forCurrentThread() {
return handler.get();
}
/**
* Thread local used to attach and track handlers.
*/
private static class LoggedExceptionHandlerThreadLocal
extends ThreadLocal {
@Override
protected LoggedExceptionHandler initialValue() {
LoggedExceptionHandler handler = new LoggedExceptionHandler(
Thread.currentThread().getUncaughtExceptionHandler());
Thread.currentThread().setUncaughtExceptionHandler(handler);
return handler;
};
}
}