/*    Copyright 2013 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/scoped_ptr.hpp>

#include "mongo/base/disallow_copying.h"
#include "mongo/base/status.h"
#include "mongo/logger/appender.h"
#include "mongo/logger/encoder.h"
#include "mongo/logger/rotatable_file_writer.h"

namespace mongo {
namespace logger {

    /**
     * Appender for writing to instances of RotatableFileWriter.
     */
    template <typename Event>
    class RotatableFileAppender : public Appender<Event> {
        MONGO_DISALLOW_COPYING(RotatableFileAppender);

    public:
        typedef Encoder<Event> EventEncoder;

        /**
         * Constructs an appender, that owns "encoder", but not "writer."  Caller must
         * keep "writer" in scope at least as long as the constructed appender.
         */
        RotatableFileAppender(EventEncoder* encoder, RotatableFileWriter* writer) :
            _encoder(encoder),
            _writer(writer) {
        }

        virtual Status append(const Event& event) {
            RotatableFileWriter::Use useWriter(_writer);
            Status status = useWriter.status();
            if (!status.isOK())
                return status;
            _encoder->encode(event, useWriter.stream()).flush();
            return useWriter.status();
        }

    private:
        boost::scoped_ptr<EventEncoder> _encoder;
        RotatableFileWriter* _writer;
    };

}  // namespace logger
}  // namespace mongo