| /* |
| * 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.felix.mosgi.jmx.rmiconnector.mx4j.remote; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| import java.util.StringTokenizer; |
| |
| import javax.management.remote.JMXServiceURL; |
| |
| import org.apache.felix.mosgi.jmx.rmiconnector.mx4j.remote.MX4JRemoteConstants; |
| import org.apache.felix.mosgi.jmx.rmiconnector.mx4j.remote.ProviderHelper; |
| |
| import org.osgi.service.log.LogService; |
| |
| import org.apache.felix.mosgi.jmx.rmiconnector.RmiConnectorActivator; |
| |
| /** |
| * ConnectionResolver handles the details of creating connections for different protocols. |
| * Subclasses for the specific protocol are found using a mechanism very similar to the |
| * one specified by {@link javax.management.remote.JMXConnectorFactory}. Here a subclass |
| * has a fully qualified name specified like this: |
| * <package>.resolver.<protocol>.<PROTOCOL>Resolver, for example |
| * {@link mx4j.remote.resolver.rmi.RMIResolver} |
| * This class is used from both the client and the server. |
| * The former uses it to lookup stubs or connections to the server side; the latter uses it |
| * to create server instances and make them availale to clients, for example via JNDI. |
| * |
| * @author <a href="mailto:biorn_steedom@users.sourceforge.net">Simone Bordet</a> |
| * @version $Revision: 1.1.1.1 $ |
| */ |
| public abstract class ConnectionResolver extends ProviderHelper |
| { |
| /** |
| * Returns a subclass of ConnectionResolver for the specified protocol. |
| */ |
| public static ConnectionResolver getInstance(String proto) { |
| String protocol = normalizeProtocol(proto); |
| String resolverPackages = findResolverPackageList(); |
| //sfr return loadResolver(resolverPackages, protocol, Thread.currentThread().getContextClassLoader()); |
| return loadResolver(resolverPackages, protocol, ConnectionResolver.class.getClassLoader()); |
| } |
| |
| private static String findResolverPackageList() { |
| String packages = findSystemPackageList(MX4JRemoteConstants.PROTOCOL_RESOLVER_PACKAGES); |
| if (packages == null) |
| packages = MX4JRemoteConstants.RESOLVER_PACKAGES; |
| else |
| packages += MX4JRemoteConstants.RESOLVER_PACKAGES_SEPARATOR + MX4JRemoteConstants.RESOLVER_PACKAGES; |
| RmiConnectorActivator.log(LogService.LOG_DEBUG,"Resolver packages list is: " + packages, null); |
| return packages; |
| } |
| |
| private static ConnectionResolver loadResolver(String packages, String protocol, ClassLoader loader) { |
| StringTokenizer tokenizer = new StringTokenizer(packages, MX4JRemoteConstants.RESOLVER_PACKAGES_SEPARATOR); |
| while (tokenizer.hasMoreTokens()) { |
| String pkg = tokenizer.nextToken().trim(); |
| RmiConnectorActivator.log(LogService.LOG_DEBUG,"Resolver package: " + pkg,null); |
| if (pkg.length() == 0) continue; |
| |
| String className = protocol.toUpperCase() + MX4JRemoteConstants.RESOLVER_CLASS; |
| String resolverClassName = constructClassName(pkg, protocol, className); |
| |
| Class resolverClass = null; |
| try |
| { |
| resolverClass = loadClass(resolverClassName, loader); |
| } |
| catch (ClassNotFoundException x) |
| { |
| RmiConnectorActivator.log(LogService.LOG_DEBUG,"Resolver class " + resolverClassName + " not found, continuing with next package",null); |
| continue; |
| } |
| catch (Exception x) |
| { |
| RmiConnectorActivator.log(LogService.LOG_WARNING, "Cannot load resolver class " + resolverClassName, x); |
| return null; |
| } |
| |
| try |
| { |
| return (ConnectionResolver)resolverClass.newInstance(); |
| } |
| catch (Exception x) |
| { |
| RmiConnectorActivator.log(LogService.LOG_WARNING,"Cannot instantiate resolver class " + resolverClassName, x); |
| return null; |
| } |
| } |
| |
| // Nothing found |
| RmiConnectorActivator.log(LogService.LOG_DEBUG,"Could not find resolver for protocol " + protocol + " in package list '" + packages + "'", null); |
| return null; |
| } |
| |
| /** |
| * Looks up a connection to the server side as specified in the given JMXServiceURL. |
| * This method is used by {@link javax.management.remote.JMXConnector}s. |
| */ |
| public abstract Object lookupClient(JMXServiceURL url, Map environment) throws IOException; |
| |
| /** |
| * Connects the client returned by {@link #lookupClient} to the server side |
| */ |
| public abstract Object bindClient(Object client, Map environment) throws IOException; |
| |
| /** |
| * Creates an instance of the server as specified in the given JMXServiceURL. |
| * It is only a factory method, it should just return a fresh instance of the server; |
| * other methods are responsible to make it available to clients (for example exporting it). |
| * This method is used by {@link javax.management.remote.JMXConnectorServer}s. |
| * @see #bindServer |
| */ |
| public abstract Object createServer(JMXServiceURL url, Map environment) throws IOException; |
| |
| /** |
| * Binds the server created by {@link #createServer} to a place specified in the JMXServiceURL. |
| * @return a new JMXServiceURL that specifies where the server has been bound to. |
| * @see #unbindServer |
| */ |
| public abstract JMXServiceURL bindServer(Object server, JMXServiceURL url, Map environment) throws IOException; |
| |
| /** |
| * Unbinds the server created by {@link #createServer} from the place specified in the JMXServiceURL. |
| * @see #bindServer |
| */ |
| public abstract void unbindServer(Object server, JMXServiceURL address, Map environment) throws IOException; |
| } |