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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.host.rmi;
import java.net.InetAddress;
import java.net.URI;
import java.net.UnknownHostException;
import java.rmi.AlreadyBoundException;
import java.rmi.NoSuchObjectException;
import java.rmi.NotBoundException;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.RMISocketFactory;
import java.rmi.server.UnicastRemoteObject;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;
/**
* Default implementation of a RMI host.
*
* @version $Rev$ $Date$
*/
public class DefaultRMIHost implements RMIHost {
private final static Logger logger = Logger.getLogger(DefaultRMIHost.class.getName());
private static final int CONNECTION_TIMEOUT = 3000; // 3 seconds
// Map of RMI registries started and running
private Map<String, Registry> rmiRegistries;
private RMISocketFactory socketFactory;
public DefaultRMIHost() {
rmiRegistries = new ConcurrentHashMap<String, Registry>();
this.socketFactory = new RMISocketFactoryImpl(CONNECTION_TIMEOUT);
}
public String registerService(String uri, Remote serviceObject) throws RMIHostException, RMIHostRuntimeException {
RMIURI rmiURI = new RMIURI(uri);
Registry registry;
try {
registry = rmiRegistries.get(Integer.toString(rmiURI.port));
if (registry == null) {
try {
registry = LocateRegistry.createRegistry(rmiURI.port, socketFactory, socketFactory);
} catch (RemoteException e) {
registry = LocateRegistry.getRegistry(null, rmiURI.port, socketFactory);
}
rmiRegistries.put(Integer.toString(rmiURI.port), registry);
}
registry.bind(rmiURI.serviceName, serviceObject);
logger.info("RMI service registered: " + rmiURI);
return rmiURI.toString();
} catch (AlreadyBoundException e) {
throw new RMIHostException(e);
} catch (RemoteException e) {
RMIHostRuntimeException rmiExec = new RMIHostRuntimeException(e.getMessage());
rmiExec.setStackTrace(e.getStackTrace());
throw rmiExec;
}
}
public void unregisterService(String uri) throws RMIHostException, RMIHostRuntimeException {
RMIURI rmiURI = new RMIURI(uri);
try {
Registry registry = rmiRegistries.get(Integer.toString(rmiURI.port));
if (registry == null) {
registry = LocateRegistry.getRegistry(null, rmiURI.port, socketFactory);
rmiRegistries.put(Integer.toString(rmiURI.port), registry);
}
registry.unbind(rmiURI.serviceName);
logger.info("RMI service unregistered: " + rmiURI);
} catch (RemoteException e) {
RMIHostRuntimeException rmiExec = new RMIHostRuntimeException(e.getMessage());
rmiExec.setStackTrace(e.getStackTrace());
throw rmiExec;
} catch (NotBoundException e) {
throw new RMIHostException(e.getMessage());
}
}
public Remote findService(String uri) throws RMIHostException, RMIHostRuntimeException {
RMIURI rmiURI = new RMIURI(uri);
Remote remoteService = null;
try {
// Requires permission java.net.SocketPermission "host:port", "connect,accept,resolve"
// in security policy.
Registry registry = LocateRegistry.getRegistry(rmiURI.host, rmiURI.port, socketFactory);
if (registry != null) {
remoteService = registry.lookup(rmiURI.serviceName);
}
} catch (RemoteException e) {
RMIHostRuntimeException rmiExec = new RMIHostRuntimeException(e.getMessage());
rmiExec.setStackTrace(e.getStackTrace());
throw rmiExec;
} catch (NotBoundException e) {
throw new RMIHostException(e.getMessage());
}
return remoteService;
}
/**
* A representation of an RMI URI.
*
* rmi://[host][:port][/[object]]
* rmi:[/][object]
*/
private static class RMIURI {
private String uriStr;
private String host;
private int port;
private String serviceName;
private RMIURI(String uriStr) {
URI uri = URI.create(uriStr);
host = uri.getHost();
if (host == null) {
try {
host = InetAddress.getLocalHost().getHostName();
} catch (UnknownHostException e) {
host = "localhost";
}
}
port = uri.getPort();
if (port <= 0) {
port = RMI_DEFAULT_PORT;
}
String path = uri.getPath();
if (path != null && path.charAt(0) == '/') {
path = path.substring(1);
}
serviceName = path;
this.uriStr = "rmi://" + host + ":" + port + "/" + serviceName;
}
public String toString() {
return uriStr;
}
}
public void stop() {
for (Registry registry : rmiRegistries.values()) {
try {
UnicastRemoteObject.unexportObject(registry, false);
} catch (NoSuchObjectException e) {
e.printStackTrace();
}
}
rmiRegistries.clear();
}
}
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