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Swirlds is a software platform designed to build fully-distributed applications that harness the power of the cloud without servers. Now you can develop applications with fairness in decision making, speed, trust and reliability, at a fraction of the cost of traditional server-based platforms.

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/*
 * Copyright (C) 2020-2024 Hedera Hashgraph, LLC
 *
 * 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.
 */

package com.swirlds.common.notification.internal;

import com.swirlds.common.notification.DispatchMode;
import com.swirlds.common.notification.DispatchModel;
import com.swirlds.common.notification.DispatchOrder;
import com.swirlds.common.notification.Listener;
import com.swirlds.common.notification.Notification;
import com.swirlds.common.notification.NotificationEngine;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;

public abstract class AbstractNotificationEngine implements NotificationEngine {

    private Map, DispatchMode> listenerModeCache;
    private Map, DispatchOrder> listenerOrderCache;
    private AtomicLong sequence;

    public AbstractNotificationEngine() {
        this.listenerModeCache = new HashMap<>();
        this.listenerOrderCache = new HashMap<>();
        this.sequence = new AtomicLong(0);
    }

    protected synchronized  DispatchMode dispatchMode(final Class listenerClass) {
        if (listenerModeCache.containsKey(listenerClass)) {
            return listenerModeCache.get(listenerClass);
        }

        final DispatchModel model = listenerClass.getAnnotation(DispatchModel.class);
        DispatchMode mode = DispatchMode.SYNC;

        if (model != null) {
            mode = model.mode();
        }

        listenerModeCache.putIfAbsent(listenerClass, mode);
        return mode;
    }

    protected synchronized  DispatchOrder dispatchOrder(final Class listenerClass) {
        if (listenerOrderCache.containsKey(listenerClass)) {
            return listenerOrderCache.get(listenerClass);
        }

        final DispatchModel model = listenerClass.getAnnotation(DispatchModel.class);
        DispatchOrder order = DispatchOrder.UNORDERED;

        if (model != null) {
            order = model.order();
        }

        listenerOrderCache.putIfAbsent(listenerClass, order);
        return order;
    }

    protected  void assignSequence(final N notification) {
        if (notification == null) {
            throw new IllegalArgumentException("notification");
        }

        if (notification.getSequence() != 0) {
            return;
        }

        notification.setSequence(sequence.incrementAndGet());
    }
}