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Efficient reliable UDP unicast, UDP multicast, and IPC transport protocol.

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/*
 * Copyright 2014 - 2016 Real Logic Ltd.
 *
 * 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 uk.co.real_logic.aeron;

import uk.co.real_logic.agrona.collections.Int2ObjectHashMap;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.function.Consumer;

import static java.util.stream.Collectors.toList;

class ActiveSubscriptions
{
    private final Int2ObjectHashMap> subscriptionsByStreamIdMap = new Int2ObjectHashMap<>();

    public void forEach(final int streamId, final Consumer handler)
    {
        final List subscriptions = subscriptionsByStreamIdMap.get(streamId);
        if (null != subscriptions)
        {
            subscriptions.forEach(handler);
        }
    }

    public void add(final Subscription subscription)
    {
        final List subscriptions = subscriptionsByStreamIdMap.computeIfAbsent(
            subscription.streamId(), (ignore) -> new ArrayList<>());

        subscriptions.add(subscription);
    }

    public void remove(final Subscription subscription)
    {
        final int streamId = subscription.streamId();
        final List subscriptions = subscriptionsByStreamIdMap.get(streamId);
        if (subscriptions.remove(subscription) && subscriptions.isEmpty())
        {
            subscriptionsByStreamIdMap.remove(streamId);
            if (subscriptionsByStreamIdMap.isEmpty())
            {
                subscriptionsByStreamIdMap.remove(streamId);
            }
        }
    }

    public void close()
    {
        subscriptionsByStreamIdMap
            .values()
            .stream()
            .flatMap(Collection::stream)
            .collect(toList())
            .forEach(Subscription::close);
    }
}