com.mchange.rmi.RegistryManager Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java v.0.2.3
*
* Copyright (C) 2012 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1, as
* published by the Free Software Foundation.
*
* 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. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this software; see the file LICENSE. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
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);}
}