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/*
Copyright 2013 Red Hat, Inc. and/or its affiliates.
This file is part of lightblue.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
*/
package com.redhat.lightblue.util;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayDeque;
import java.util.StringTokenizer;
/**
* Error object. Maintains an error code, message, and context of the error. The
* context works as a stack of context information that can be passed to the
* client as an indicator of where the error happened.
*
* The error object also provides static APIs that keep the execution context
* for the current thread.
*/
public final class Error extends RuntimeException {
private static final Logger LOGGER = LoggerFactory.getLogger(Error.class);
private static final long serialVersionUID = 1L;
private static final JsonNodeFactory FACTORY = JsonNodeFactory.withExactBigDecimals(true);
private static final ThreadLocal> THREAD_CONTEXT = new ThreadLocal< ArrayDeque>() {
@Override
protected ArrayDeque initialValue() {
return new ArrayDeque<>();
}
};
public static final char DELIMITER = '/';
private final ArrayDeque context;
private final String errorCode;
private final String msg;
/**
* Pushes the given context information to the current thread stack
*/
public static void push(String context) {
if (null == context) {
context = "null";
}
LOGGER.debug("push: {}", context);
THREAD_CONTEXT.get().addLast(context);
}
/**
* Pops the context information from current thread stack
*/
public static void pop() {
ArrayDeque c = THREAD_CONTEXT.get();
if (!c.isEmpty()) {
String context = c.removeLast();
LOGGER.debug("pop: {}", context);
}
if (c.isEmpty()) {
reset();
}
}
/**
* Constructs a new error object by pushing the given context on top of the
* current context
*/
public static Error get(String ctx, String errorCode, String msg) {
push(ctx);
try {
Error x = new Error(THREAD_CONTEXT.get(), errorCode, msg);
return x;
} finally {
pop();
}
}
/**
* Helper that gets a new Error with msg set to the stack trace of the given Throwable.
*/
public static Error get(String ctx, String errorCode, Throwable msg) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
msg.printStackTrace(pw);
return get(ctx, errorCode, sw.toString());
}
/**
* Constructs a new error object using the current context
*/
public static Error get(String errorCode, String msg) {
return new Error(THREAD_CONTEXT.get(), errorCode, msg);
}
/**
* Helper that gets a new Error with msg set to the stack trace of the given Throwable.
*/
public static Error get(String errorCode, Throwable msg) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
msg.printStackTrace(pw);
return get(errorCode, sw.toString());
}
/**
* Constructs a new error object using the current context
*/
public static Error get(String errorCode) {
return new Error(THREAD_CONTEXT.get(), errorCode, null);
}
/**
* Resets the stack thread context
*/
public static void reset() {
LOGGER.debug("reset");
THREAD_CONTEXT.remove();
}
private Error(String errorCode, String msg) {
this.context = new ArrayDeque<>();
this.errorCode = errorCode;
this.msg = msg;
}
private Error(ArrayDeque context, String errorCode, String msg) {
this.context = (ArrayDeque) context.clone();
this.errorCode = errorCode;
this.msg = msg;
}
public void pushContext(String context) {
this.context.addLast(context);
}
public void popContext() {
this.context.removeLast();
}
public String getErrorCode() {
return errorCode;
}
public String getMsg() {
return msg;
}
public String getContext() {
StringBuilder s = new StringBuilder();
if (!context.isEmpty()) {
boolean first = true;
for (String x : context) {
if (first) {
first = false;
} else {
s.append(DELIMITER);
}
s.append(x);
}
}
return s.toString();
}
public JsonNode toJson() {
ObjectNode node = (ObjectNode) FACTORY.objectNode();
node.put("objectType", FACTORY.textNode("error"));
if (!context.isEmpty()) {
node.put("context", FACTORY.textNode(getContext()));
}
if (errorCode != null) {
node.put("errorCode", FACTORY.textNode(errorCode));
}
if (msg != null) {
node.put("msg", FACTORY.textNode(msg));
}
return node;
}
@Override
public String toString() {
return toJson().toString();
}
@Override
public String getMessage() {
return this.toString();
}
public static Error fromJson(JsonNode node) {
if (node instanceof ObjectNode) {
String e = null;
String m = null;
JsonNode x;
x = ((ObjectNode) node).get("errorCode");
if (x != null) {
e = x.asText();
}
x = ((ObjectNode) node).get("msg");
if (x != null) {
m = x.asText();
}
Error ret = new Error(e, m);
x = ((ObjectNode) node).get("context");
if (x != null) {
StringTokenizer tok = new StringTokenizer(x.asText(), "/");
while (tok.hasMoreTokens()) {
ret.pushContext(tok.nextToken());
}
}
return ret;
}
return null;
}
}
