/*
 * 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.
 */

package org.apache.dolphinscheduler.server.master.event;

import org.apache.dolphinscheduler.common.enums.StateEventType;

import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.ServiceLoader;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class StateEventHandlerManager {

    private static final Map<StateEventType, StateEventHandler> stateEventHandlerMap = new HashMap<>();

    static {
        ServiceLoader.load(StateEventHandler.class)
                .forEach(stateEventHandler -> {
                    log.info("Initialize StateEventHandler: {} for eventType: {}",
                            stateEventHandler.getClass().getName(), stateEventHandler.getEventType());
                    stateEventHandlerMap.put(stateEventHandler.getEventType(), stateEventHandler);
                });
    }

    public static Optional<StateEventHandler> getStateEventHandler(StateEventType stateEventType) {
        return Optional.ofNullable(stateEventHandlerMap.get(stateEventType));
    }

}
