com.mchange.rmi.RMIRegistryCallingCard Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.11
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* 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.net.*;
import java.rmi.*;
import java.rmi.registry.*;
import com.mchange.io.*;
public class RMIRegistryCallingCard implements CallingCard, Serializable
{
transient Remote cached = null; //really transient
transient /* not */ String url;
public RMIRegistryCallingCard(String regHost, int reg_port, String name)
{this.url = "//" + regHost.toLowerCase() + ':' + reg_port + '/' + name;}
public RMIRegistryCallingCard(String regHost, String name)
{this(regHost, Registry.REGISTRY_PORT, name);}
public boolean equals(Object o)
{return (o instanceof RMIRegistryCallingCard) && this.url.equals(((RMIRegistryCallingCard) o).url);}
public int hashCode()
{return url.hashCode();}
public Remote findRemote() throws ServiceUnavailableException, RemoteException
{
if (cached instanceof Checkable)
{
try
{
((Checkable) cached).check();
return cached;
}
catch (RemoteException e)
{
cached = null;
return findRemote();
}
}
else
{
try
{
Remote r = Naming.lookup(url);
if (r instanceof Checkable)
cached = r;
return r;
}
catch (NotBoundException e)
{throw new ServiceUnavailableException("Object Not Bound: " + url);}
catch (MalformedURLException e) //I'd like to check for this in constructor, but how?
{throw new ServiceUnavailableException("Uh oh. Bad url. It never will be available: " + url);}
}
}
public String toString()
{return super.toString() + " [" + url + "];";}
//Serialization stuff
static final long serialVersionUID = 1;
private final static short VERSION = 0x0001;
private void writeObject(ObjectOutputStream out) throws IOException
{
out.writeShort(VERSION);
out.writeUTF(url);
}
private void readObject(ObjectInputStream in) throws IOException
{
short version = in.readShort();
switch (version)
{
case 0x0001:
url = in.readUTF();
break;
default:
throw new UnsupportedVersionException(this.getClass().getName() + "; Bad version: " + version);
}
}
}