Java tutorial
/* * JBoss, Home of Professional Open Source. * Copyright 2009, Red Hat Middleware LLC, and individual contributors * as indicated by the @author tags. See the copyright.txt file in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * 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; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ package org.jboss.adminclient.connection; import java.util.Properties; import javax.naming.InitialContext; import javax.naming.NamingException; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * @author Ian Springer */ public abstract class AbstractProfileServiceConnectionProvider implements ProfileServiceConnectionProvider { private final Log log = LogFactory.getLog(this.getClass()); private ProfileServiceConnectionImpl existingConnection; private boolean connected; public final ProfileServiceConnection connect() { ProfileServiceConnectionImpl connection = doConnect(); this.connected = true; if (this.existingConnection == null) this.existingConnection = connection; return this.existingConnection; } protected abstract ProfileServiceConnectionImpl doConnect(); public boolean isConnected() { return this.connected; } public final void disconnect() { this.connected = false; doDisconnect(); } protected abstract void doDisconnect(); public ProfileServiceConnection getExistingConnection() { return this.existingConnection; } protected InitialContext createInitialContext(Properties env) { InitialContext initialContext; this.log.debug("Creating JNDI InitialContext with env [" + env + "]..."); try { initialContext = new InitialContext(env); } catch (NamingException e) { throw new RuntimeException("Failed to create JNDI InitialContext.", e); } this.log.debug("Created JNDI InitialContext [" + initialContext + "]."); return initialContext; } protected Object lookup(InitialContext initialContext, String name) { try { return initialContext.lookup(name); } catch (NamingException e) { throw new RuntimeException("Failed to lookup JNDI name '" + name + "' from InitialContext.", e); } } }