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/* Copyright 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include <boost/config.hpp>
#include <iosfwd>
#include <string>
#include "mongo/base/error_codes.h"
#include "mongo/platform/atomic_word.h"
namespace mongo {
/**
* Status represents an error state or the absence thereof.
*
* A Status uses the standardized error codes -- from file 'error_codes.h' -- to
* determine an error's cause. It further clarifies the error with a textual
* description. Optionally, a Status may also have an error location number, which
* should be a unique, grep-able point in the code base (including assert numbers).
*
* Example usage:
*
* Status sumAB(int a, int b, int* c) {
* if (overflowIfSum(a,b)) {
* return Status(ErrorCodes::ERROR_OVERFLOW, "overflow in sumAB", 16494);
* }
*
* *c = a+b;
* return Status::OK();
* }
*
* TODO: expand base/error_codes.h to capture common errors in current code
* TODO: generate base/error_codes.h out of a description file
* TODO: check 'location' duplicates against assert numbers
*/
class Status {
public:
// Short-hand for returning an OK status.
static inline Status OK();
/**
* Builds an error status given the error code, a textual description of what
* caused the error, and a unique position in the where the error occurred
* (similar to an assert number)
*/
Status(ErrorCodes::Error code, const std::string& reason, int location = 0);
Status(ErrorCodes::Error code, const char* reason, int location = 0);
inline Status(const Status& other);
inline Status& operator=(const Status& other);
inline Status(Status&& other) BOOST_NOEXCEPT;
inline Status& operator=(Status&& other) BOOST_NOEXCEPT;
inline ~Status();
/**
* Returns true if 'other's error code and location are equal/different to this
* instance's. Otherwise returns false.
*/
bool compare(const Status& other) const;
bool operator==(const Status& other) const;
bool operator!=(const Status& other) const;
/**
* Returns true if 'other's error code is equal/different to this instance's.
* Otherwise returns false.
*/
bool compareCode(const ErrorCodes::Error other) const;
bool operator==(const ErrorCodes::Error other) const;
bool operator!=(const ErrorCodes::Error other) const;
//
// accessors
//
inline bool isOK() const;
inline ErrorCodes::Error code() const;
inline std::string codeString() const;
inline std::string reason() const;
inline int location() const;
std::string toString() const;
//
// Below interface used for testing code only.
//
inline AtomicUInt32::WordType refCount() const;
private:
inline Status();
struct ErrorInfo {
AtomicUInt32 refs; // reference counter
const ErrorCodes::Error code; // error code
const std::string reason; // description of error cause
const int location; // unique location of the triggering line in the code
static ErrorInfo* create(ErrorCodes::Error code,
StringData reason, int location);
ErrorInfo(ErrorCodes::Error code, StringData reason, int location);
};
ErrorInfo* _error;
/**
* Increment/Decrement the reference counter inside an ErrorInfo
*
* @param error ErrorInfo to be incremented
*/
static inline void ref(ErrorInfo* error);
static inline void unref(ErrorInfo* error);
};
inline bool operator==(const ErrorCodes::Error lhs, const Status& rhs);
inline bool operator!=(const ErrorCodes::Error lhs, const Status& rhs);
//
// Convenience method for unittest code. Please use accessors otherwise.
//
std::ostream& operator<<(std::ostream& os, const Status& status);
std::ostream& operator<<(std::ostream& os, ErrorCodes::Error);
} // namespace mongo
#include "mongo/base/status-inl.h"
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