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/* Copyright 2013 10gen 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.
*/
#pragma once
#include <boost/scoped_ptr.hpp>
#include <iostream>
#include <sstream>
#include <string>
#include "mongo/client/export_macros.h"
#include "mongo/logger/labeled_level.h"
#include "mongo/logger/log_severity.h"
#include "mongo/logger/message_log_domain.h"
#include "mongo/util/exit_code.h"
namespace mongo {
namespace logger {
class Tee;
/**
* Stream-ish object used to build and append log messages.
*/
class MONGO_CLIENT_API LogstreamBuilder {
public:
static LogSeverity severityCast(int ll) { return LogSeverity::cast(ll); }
static LogSeverity severityCast(LogSeverity ls) { return ls; }
static LabeledLevel severityCast(const LabeledLevel &labeled) { return labeled; }
/**
* Construct a LogstreamBuilder that writes to "domain" on destruction.
*
* "contextName" is a short name of the thread or other context.
* "severity" is the logging priority/severity of the message.
*/
LogstreamBuilder(MessageLogDomain* domain,
const std::string& contextName,
LogSeverity severity);
/**
* Deprecated.
*/
LogstreamBuilder(MessageLogDomain* domain,
const std::string& contextName,
LabeledLevel labeledLevel);
/**
* Copies a LogstreamBuilder. LogstreamBuilder instances are copyable only until the first
* call to stream() or operator<<.
*
* TODO(schwerin): After C++11 transition, replace with a move-constructor, and make
* LogstreamBuilder movable.
*/
LogstreamBuilder(const LogstreamBuilder& other);
/**
* Destroys a LogstreamBuilder(). If anything was written to it via stream() or operator<<,
* constructs a MessageLogDomain::Event and appends it to the associated domain.
*/
~LogstreamBuilder();
/**
* Sets an optional prefix for the message.
*/
LogstreamBuilder& setBaseMessage(const std::string& baseMessage) {
_baseMessage = baseMessage;
return *this;
}
std::ostream& stream() { makeStream(); return *_os; }
LogstreamBuilder& operator<<(const char *x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(const std::string& x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(const StringData& x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(char *x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(char x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(int x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(ExitCode x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(long x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(unsigned long x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(unsigned x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(unsigned short x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(double x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(void *x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(const void *x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(long long x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(unsigned long long x) { stream() << x; return *this; }
LogstreamBuilder& operator<<(bool x) { stream() << x; return *this; }
template <typename T>
LogstreamBuilder& operator<<(const T& x) {
stream() << x.toString();
return *this;
}
LogstreamBuilder& operator<< (std::ostream& ( *manip )(std::ostream&)) {
stream() << manip;
return *this;
}
LogstreamBuilder& operator<< (std::ios_base& (*manip)(std::ios_base&)) {
stream() << manip;
return *this;
}
/**
* In addition to appending the message to _domain, write it to the given tee. May only
* be called once per instance of LogstreamBuilder.
*/
void operator<<(Tee* tee);
private:
LogstreamBuilder& operator=(const LogstreamBuilder& other);
void makeStream();
MessageLogDomain* _domain;
std::string _contextName;
LogSeverity _severity;
std::string _baseMessage;
std::ostringstream* _os;
Tee* _tee;
};
} // namespace logger
} // namespace mongo
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