mongodb/util/log.h

// log.h

/**
*    Copyright (C) 2008 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/>.
*/

#pragma once

class Nullstream {
public:
    Nullstream& operator<<(const char *) {
        return *this;
    }
    Nullstream& operator<<(int) {
        return *this;
    }
    Nullstream& operator<<(unsigned long) {
        return *this;
    }
    Nullstream& operator<<(unsigned) {
        return *this;
    }
    Nullstream& operator<<(double) {
        return *this;
    }
    Nullstream& operator<<(void *) {
        return *this;
    }
    Nullstream& operator<<(long long) {
        return *this;
    }
    Nullstream& operator<<(unsigned long long) {
        return *this;
    }
    Nullstream& operator<<(const string&) {
        return *this;
    }
    Nullstream& operator<< (ostream& ( *endl )(ostream&)) {
        return *this;
    }
    Nullstream& operator<< (ios_base& (*hex)(ios_base&)) {
        return *this;
    }
};
inline Nullstream& endl ( Nullstream& os ) {
    return os;
}
extern Nullstream nullstream;

#define LOGIT { boostlock lk(mutex); cout << x; return *this; }
class Logstream {
    static boost::mutex mutex;
public:
    void flush() {
        boostlock lk(mutex);
        cout.flush();
    }
    Logstream& operator<<(const char *x) LOGIT
    Logstream& operator<<(char x) LOGIT
    Logstream& operator<<(int x) LOGIT
    Logstream& operator<<(unsigned long x) LOGIT
    Logstream& operator<<(unsigned x) LOGIT
    Logstream& operator<<(double x) LOGIT
    Logstream& operator<<(void *x) LOGIT
    Logstream& operator<<(long long x) LOGIT
    Logstream& operator<<(unsigned long long x) LOGIT
    Logstream& operator<<(const string& x) LOGIT
    Logstream& operator<< (ostream& ( *_endl )(ostream&)) {
        boostlock lk(mutex);
        cout << _endl;
        return *this;
    }
    Logstream& operator<< (ios_base& (*_hex)(ios_base&)) {
        boostlock lk(mutex);
        cout << _hex;
        return *this;
    }
    Logstream& prolog(bool withNs = false) {
        char now[64];
        time_t_to_String(time(0), now);
        now[20] = 0;

        boostlock lk(mutex);
        cout << now;
        if ( withNs && database && curNs )
            cout << curNs << ' ';
        return *this;
    }
};
inline Logstream& endl ( Logstream& os ) {
    return os;
}
extern Logstream logstream;

inline Logstream& problem() {
    return logstream.prolog(true);
}
inline Logstream& log() {
    return logstream.prolog();
}

inline ostream& stdcout() { return cout; }

#define cout logstream