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PortAuthority.java
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PortAuthority.java
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/*
* Copyright (c) 2002-2017 "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;
import static org.neo4j.causalclustering.PortConstants.EphemeralPortMinimum;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
/**
* A source for free ports from the ephemeral/ dynamic port range, suitable for short lived things like tests.
*/
public class PortAuthority
{
private static final PortProvider portProvider;
static
{
String portAuthorityDirectory = System.getProperty( "port.authority.directory" );
if ( portAuthorityDirectory == null )
{
portProvider = new SimplePortProvider( new DefaultPortProbe(), EphemeralPortMinimum );
}
else
{
try
{
Path directory = Paths.get( portAuthorityDirectory );
Files.createDirectories( directory );
PortRepository portRepository = new PortRepository( directory, 20000 );
PortProbe portProbe = new DefaultPortProbe();
portProvider = new CoordinatingPortProvider( portRepository, portProbe );
}
catch ( IOException e )
{
throw new ExceptionInInitializerError( e );
}
}
}
public static int allocatePort()
{
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
try ( PrintWriter printWriter = new PrintWriter( outputStream ) )
{
new Exception().printStackTrace( printWriter );
}
return portProvider.getNextFreePort( new String( outputStream.toByteArray() ) );
}
}