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/*
 * Copyright (c) 2010-2017, KolibriFX AS. Licensed under the Apache License, version 2.0.
 */

package com.kolibrifx.plovercrest.server.internal;

import com.kolibrifx.plovercrest.server.ReadObserver;
import com.kolibrifx.plovercrest.server.Table;

public abstract class TableSubscriptionObserver extends ReadObserver {
    protected long entryIndex;

    public void setEntryIndex(final long readerOffset) {
        this.entryIndex = readerOffset;
    }

    public void observeTableCreated() {
        // do nothing, subclasses can override
    }

    /**
     * This function is called from the event dispatcher thread (same as observe) and should be used
     * to initialize at most one new subscription. Must return the entry index of the new
     * subscription, or null if no new subscriptions have been registered.
     * 
     * Timestamp-based subscriptions must be converted to index-based subscriptions, this can be
     * done by using a temporary TableReader.
     */
    public Long initNewSubscription(final Table table) {
        return null;
    }
}