log_domain.h

/*    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 <memory>
#include <string>
#include <vector>

#include "mongo/base/disallow_copying.h"
#include "mongo/logger/appender.h"
#include "mongo/logger/log_severity.h"

namespace mongo {
namespace logger {

template <typename E>
class MONGO_CLIENT_API LogDomain {
    MONGO_DISALLOW_COPYING(LogDomain);

public:
    typedef E Event;
    typedef Appender<Event> EventAppender;

    class AppenderHandle {
        friend class LogDomain;

    public:
        AppenderHandle() {}

    private:
        explicit AppenderHandle(size_t index) : _index(index) {}

        size_t _index;
    };

    // TODO(schwerin): Replace with unique_ptr in C++11.
    typedef std::auto_ptr<EventAppender> AppenderAutoPtr;

    LogDomain();
    ~LogDomain();

    Status append(const Event& event);

    bool getAbortOnFailure() const {
        return _abortOnFailure;
    }

    void setAbortOnFailure(bool abortOnFailure) {
        _abortOnFailure = abortOnFailure;
    }

    //
    // Configuration methods.  Must be synchronized with each other and calls to "append" by the
    // caller.
    //

    AppenderHandle attachAppender(AppenderAutoPtr appender);

    AppenderAutoPtr detachAppender(AppenderHandle handle);

    void clearAppenders();

private:
    typedef std::vector<EventAppender*> AppenderVector;

    AppenderVector _appenders;
    bool _abortOnFailure;
};

}  // namespace logger
}  // namespace mongo