/
CatchUpChannelPool.java
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/
CatchUpChannelPool.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.causalclustering.catchup;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import org.neo4j.causalclustering.discovery.NoKnownAddressesException;
import org.neo4j.helpers.AdvertisedSocketAddress;
class CatchUpChannelPool<CHANNEL extends CatchUpChannelPool.Channel>
{
private final Map<AdvertisedSocketAddress, LinkedList<CHANNEL>> idleChannels = new HashMap<>();
private final Set<CHANNEL> activeChannels = new HashSet<>();
private final Function<AdvertisedSocketAddress, CHANNEL> factory;
CatchUpChannelPool( Function<AdvertisedSocketAddress, CHANNEL> factory )
{
this.factory = factory;
}
synchronized CHANNEL acquire( AdvertisedSocketAddress catchUpAddress ) throws NoKnownAddressesException
{
CHANNEL channel;
LinkedList<CHANNEL> channels = idleChannels.get( catchUpAddress );
if ( channels == null )
{
channel = factory.apply( catchUpAddress );
}
else
{
channel = channels.poll();
if ( channels.isEmpty() )
{
idleChannels.remove( catchUpAddress );
}
}
activeChannels.add( channel );
return channel;
}
synchronized void dispose( CHANNEL channel )
{
activeChannels.remove( channel );
channel.close();
}
synchronized void release( CHANNEL channel )
{
activeChannels.remove( channel );
idleChannels.computeIfAbsent( channel.destination(), (address) -> new LinkedList<>() ).add( channel );
}
synchronized void close()
{
idleChannels.values().stream().flatMap( Collection::stream )
.forEach( Channel::close );
activeChannels.forEach( Channel::close );
}
interface Channel
{
AdvertisedSocketAddress destination();
void close();
}
}