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SharedDiscoveryService.java
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SharedDiscoveryService.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.coreedge.discovery;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.neo4j.coreedge.core.consensus.schedule.DelayedRenewableTimeoutService;
import org.neo4j.coreedge.identity.ClusterId;
import org.neo4j.coreedge.identity.MemberId;
import org.neo4j.coreedge.messaging.address.AdvertisedSocketAddress;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.logging.LogProvider;
import static java.util.Collections.unmodifiableMap;
import static java.util.Collections.unmodifiableSet;
public class SharedDiscoveryService implements DiscoveryServiceFactory
{
private final Map<MemberId, CoreAddresses> coreMembers = new HashMap<>( );
private final Set<EdgeAddresses> edgeAddresses = new HashSet<>();
private final List<SharedDiscoveryCoreClient> coreClients = new ArrayList<>();
private final Lock lock = new ReentrantLock();
private final Condition enoughMembers = lock.newCondition();
private ClusterId clusterId;
@Override
public CoreTopologyService coreTopologyService( Config config, MemberId myself,
DiscoveredMemberRepository discoveredMemberRepository, LogProvider logProvider )
{
SharedDiscoveryCoreClient sharedDiscoveryCoreClient = new SharedDiscoveryCoreClient( this, myself, logProvider, config );
sharedDiscoveryCoreClient.onTopologyChange( currentTopology( sharedDiscoveryCoreClient ) );
return sharedDiscoveryCoreClient;
}
@Override
public TopologyService edgeDiscoveryService( Config config, AdvertisedSocketAddress boltAddress, LogProvider logProvider, DelayedRenewableTimeoutService timeoutService, long edgeTimeToLiveTimeout, long edgeRefreshRate )
{
return new SharedDiscoveryEdgeClient( this, boltAddress, logProvider );
}
void waitForClusterFormation() throws InterruptedException
{
lock.lock();
try
{
while ( coreMembers.size() < 2 )
{
enoughMembers.await( 10, TimeUnit.SECONDS );
}
}
finally
{
lock.unlock();
}
}
ClusterTopology currentTopology( SharedDiscoveryCoreClient client )
{
lock.lock();
try
{
return new ClusterTopology(
clusterId,
coreClients.size() > 0 && coreClients.get( 0 ) == client,
unmodifiableMap( coreMembers ),
unmodifiableSet( edgeAddresses )
);
}
finally
{
lock.unlock();
}
}
void registerCoreMember( MemberId memberId, CoreAddresses coreAddresses, SharedDiscoveryCoreClient client )
{
lock.lock();
try
{
coreMembers.put( memberId, coreAddresses );
coreClients.add( client );
enoughMembers.signalAll();
notifyCoreClients();
}
finally
{
lock.unlock();
}
}
void unRegisterCoreMember( MemberId memberId, SharedDiscoveryCoreClient client )
{
lock.lock();
try
{
coreMembers.remove( memberId );
coreClients.remove( client );
notifyCoreClients();
}
finally
{
lock.unlock();
}
}
private void notifyCoreClients()
{
for ( SharedDiscoveryCoreClient coreClient : coreClients )
{
coreClient.onTopologyChange( currentTopology( coreClient ) );
}
}
void registerEdgeMember( EdgeAddresses edgeAddresses )
{
lock.lock();
try
{
this.edgeAddresses.add( edgeAddresses );
notifyCoreClients();
}
finally
{
lock.unlock();
}
}
void unRegisterEdgeMember( EdgeAddresses edgeAddresses )
{
lock.lock();
try
{
this.edgeAddresses.remove( edgeAddresses );
notifyCoreClients();
}
finally
{
lock.unlock();
}
}
boolean casClusterId( ClusterId clusterId )
{
boolean success;
lock.lock();
try
{
if ( this.clusterId == null )
{
success = true;
this.clusterId = clusterId;
}
else
{
success = this.clusterId.equals( clusterId );
}
if ( success )
{
notifyCoreClients();
}
}
finally
{
lock.unlock();
}
return success;
}
}