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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.scheduler.eventbus;

import com.codahale.metrics.Counter;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Timer;
import com.google.common.eventbus.EventBus;

import static com.codahale.metrics.MetricRegistry.name;

/**
 * Job scheduler specific event bus instance. This is a synchronous event bus.
 * Subscribers must ensure that the callback method is fast or put expensive work into an executor or queue.
 */
public class JobSchedulerEventBus extends EventBus {
    private final Counter registrationsCount;
    private final Timer postTimer;

    @SuppressWarnings("WeakerAccess")
    public JobSchedulerEventBus(String name, MetricRegistry metricRegistry) {
        super(name);
        this.registrationsCount = metricRegistry.counter(name(getClass(), name, "registrations"));
        this.postTimer = metricRegistry.timer(name(getClass(), name, "posts"));
    }

    @Override
    public void register(Object object) {
        registrationsCount.inc();
        super.register(object);
    }

    @Override
    public void unregister(Object object) {
        registrationsCount.dec();
        super.unregister(object);
    }

    @Override
    public void post(Object event) {
        try (final Timer.Context ignored = postTimer.time()) {
            super.post(event);
        }
    }
}