/*
 * Copyright 2014-2017 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 io.aeron;

import org.agrona.collections.Int2ObjectHashMap;

import java.util.*;

/**
 * Map for navigating to active {@link Publication}s.
 */
class ActivePublications
{
    private final HashMap<String, Int2ObjectHashMap<Publication>> publicationsByChannelMap = new HashMap<>();

    public Publication get(final String channel, final int streamId)
    {
        final Int2ObjectHashMap<Publication> publicationByStreamIdMap = publicationsByChannelMap.get(channel);
        if (null == publicationByStreamIdMap)
        {
            return null;
        }

        return publicationByStreamIdMap.get(streamId);
    }

    @SuppressWarnings("Java8MapApi")
    public Publication put(final String channel, final int streamId, final Publication publication)
    {
        Int2ObjectHashMap<Publication> publicationByStreamIdMap = publicationsByChannelMap.get(channel);
        if (null == publicationByStreamIdMap)
        {
            publicationByStreamIdMap = new Int2ObjectHashMap<>();
            publicationsByChannelMap.put(channel, publicationByStreamIdMap);
        }

        return publicationByStreamIdMap.put(streamId, publication);
    }

    public Publication remove(final String channel, final int streamId)
    {
        final Int2ObjectHashMap<Publication> publicationByStreamIdMap = publicationsByChannelMap.get(channel);
        if (null == publicationByStreamIdMap)
        {
            return null;
        }

        final Publication publication = publicationByStreamIdMap.remove(streamId);
        if (publicationByStreamIdMap.isEmpty())
        {
            publicationsByChannelMap.remove(channel);
        }

        return publication;
    }

    public void close()
    {
        for (final Int2ObjectHashMap<Publication> publications : publicationsByChannelMap.values())
        {
            for (final Publication publication : publications.values())
            {
                publication.forceClose();
            }
        }

        publicationsByChannelMap.clear();
    }
}