// 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.

#pragma once

#include <memory>

namespace zilliz {
namespace milvus {
namespace engine {

enum class EventType {
    START_UP,
    LOAD_COMPLETED,
    FINISH_TASK,
    TASK_TABLE_UPDATED
};

class Resource;

class Event {
public:
    explicit
    Event(EventType type, std::weak_ptr<Resource> resource)
        : type_(type),
          resource_(std::move(resource)) {}

    inline EventType
    Type() const {
        return type_;
    }

    virtual std::string
    Dump() const = 0;

    friend std::ostream &operator<<(std::ostream &out, const Event &event);

public:
    EventType type_;
    std::weak_ptr<Resource> resource_;
};

using EventPtr = std::shared_ptr<Event>;

}
}
}