/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.
 */

/**
 * @author Sergey L. Ivashin
 *
 */

#ifndef _COUNTER_H_
#define _COUNTER_H_


#include <stddef.h>


namespace Jitrino 
{

class CountWriter {
public:

    virtual ~CountWriter ()     {}

    virtual void write (const char* key, const char*  value)        = 0;
    virtual void write (const char* key, int          value)        = 0;
    virtual void write (const char* key, size_t       value)        = 0;
    virtual void write (const char* key, double       value)        = 0;
};


class CounterBase
{
public:

    CounterBase (const char* s = 0);
    virtual ~CounterBase ();

    void setName (const char* s)                    {key = s;}
    void link ();
    virtual void write  (CountWriter&)              = 0;

    const char* key;

//protected:

    CounterBase* next;
    static CounterBase* head;
};


template <typename T>
class Counter : public CounterBase
{
public:

    Counter (const char* s)                         : CounterBase(s) {}
    Counter (const char* s, const T& v)             : CounterBase(s), value(v) {}

    /*virtual*/void write  (CountWriter& logs)      {logs.write(key, value);}

    operator T& ()                                  {return value;}

    T value;
};


} //namespace Jitrino 

#endif   //#ifndef _COUNTER_H_