/*    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 <iosfwd>

#include "mongo/logger/encoder.h"
#include "mongo/logger/message_event.h"
#include "mongo/util/time_support.h"

namespace mongo {
namespace logger {

/**
 * Encoder that writes log messages of the style that MongoDB writes to console and files.
 */
class MessageEventDetailsEncoder : public Encoder<MessageEventEphemeral> {
public:
    typedef void (*DateFormatter)(std::ostream&, Date_t);

    /**
     * Sets the date formatter function for all instances of MessageEventDetailsEncoder.
     *
     * Only and always safe to call during single-threaded execution, as in during start-up
     * intiailization.
     */
    static void setDateFormatter(DateFormatter dateFormatter);

    /**
     * Gets the date formatter function in use by instances of MessageEventDetailsEncoder.
     *
     * Always safe to call.
     */
    static DateFormatter getDateFormatter();

    virtual ~MessageEventDetailsEncoder();
    virtual std::ostream& encode(const MessageEventEphemeral& event, std::ostream& os);
};

/**
 * Encoder that generates log messages suitable for syslog.
 */
class MessageEventWithContextEncoder : public Encoder<MessageEventEphemeral> {
public:
    virtual ~MessageEventWithContextEncoder();
    virtual std::ostream& encode(const MessageEventEphemeral& event, std::ostream& os);
};


/**
 * Encoder that generates log messages containing only the raw text of the message.
 */
class MessageEventUnadornedEncoder : public Encoder<MessageEventEphemeral> {
public:
    virtual ~MessageEventUnadornedEncoder();
    virtual std::ostream& encode(const MessageEventEphemeral& event, std::ostream& os);
};

}  // namespace logger
}  // namespace mongo
