/*
* Distributed as part of mchange-commons-java 0.2.11
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman <swaldman@mchange.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.rmi;
import java.io.*;
import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;
public class
RegistryManager
{
public static
Registry ensureRegistry(int
port) throws
RemoteException
{
Registry reg =
findRegistry(
port);
if (
reg == null)
reg =
LocateRegistry.
createRegistry(
port);
return
reg;
}
public static
Registry ensureRegistry() throws
RemoteException
{return
ensureRegistry(
Registry.
REGISTRY_PORT);}
public static boolean
registryAvailable(int
port) throws
RemoteException,
AccessException
{
try
{
Registry reg =
LocateRegistry.
getRegistry(
port);
reg.
list(); //just a safe registry call, to see if the registry exists
return true;
}
catch (java.rmi.
ConnectException e) //this is what we get if no Registry is exported
{return false;}
}
public static boolean
registryAvailable() throws
RemoteException,
AccessException
{return
registryAvailable(
Registry.
REGISTRY_PORT);}
/**
* @return the Registry on localhost at port, if one is exported; null otherwise.
*/
public static
Registry findRegistry(int
port) throws
RemoteException,
AccessException
{
if (!
registryAvailable(
port)) return null;
else return
LocateRegistry.
getRegistry(
port);
}
/**
* @return the Registry on localhost at the default registry port, if one is exported; null otherwise.
*/
public static
Registry findRegistry() throws
RemoteException,
AccessException
{return
findRegistry(
Registry.
REGISTRY_PORT);}
}