com.github.robozonky.app.events.GlobalEvents Maven / Gradle / Ivy

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/*
 * Copyright 2020 The RoboZonky Project
 *
 * 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.github.robozonky.app.events;

import java.util.concurrent.CompletableFuture;
import java.util.function.Supplier;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.github.robozonky.api.notifications.Event;
import com.github.robozonky.api.notifications.GlobalEvent;
import com.github.robozonky.app.events.impl.EventFactory;
import com.github.robozonky.internal.tenant.LazyEvent;
import com.github.robozonky.internal.util.functional.Memoizer;

public final class GlobalEvents {

    private static final Logger LOGGER = LogManager.getLogger(GlobalEvents.class);
    private static final Supplier INSTANCE = Memoizer.memoize(GlobalEvents::new);

    private GlobalEvents() {
        // no external instances
    }

    static GlobalEvents get() {
        return INSTANCE.get();
    }

    static CompletableFuture merge(final CompletableFuture... runnables) {
        return CompletableFuture.allOf(runnables);
    }

    public CompletableFuture fire(final LazyEvent event) {
        LOGGER.debug("Firing {} for all sessions.", event);
        final CompletableFuture[] futures = SessionEvents.all()
            .stream()
            .map(s -> s.fireAny(event))
            .toArray(CompletableFuture[]::new);
        return merge(futures);
    }

    /**
     * Transforms given {@link Event} into {@link LazyEvent} and delegates to {@link #fire(LazyEvent)}.
     * 
     * @param event Event to fire.
     * @return never null, event fired when complete.
     */
    public CompletableFuture fire(final GlobalEvent event) {
        return fire(EventFactory.async((Class) event.getClass(), () -> event));
    }
}