Java tutorial
/** * Copyright (c) 2009--2012 Red Hat, Inc. * * This software is licensed to you under the GNU General Public License, * version 2 (GPLv2). There is NO WARRANTY for this software, express or * implied, including the implied warranties of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2 * along with this software; if not, see * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. * * Red Hat trademarks are not licensed under GPLv2. No permission is * granted to use or replicate Red Hat trademarks that are incorporated * in this software or its documentation. */ package com.redhat.rhn.domain.server.test; import com.redhat.rhn.common.hibernate.HibernateFactory; import com.redhat.rhn.domain.server.Server; import com.redhat.rhn.domain.server.VirtualInstance; import com.redhat.rhn.domain.user.User; import com.redhat.rhn.testing.ServerTestUtils; import org.hibernate.Session; import java.util.Iterator; import java.util.LinkedList; import java.util.List; import java.util.Map; /** * HostBuilder is a class based on the GoF Builder pattern that constructs systems that are * virtual hosts. That is, systems with one of the virtualization entitlements. * @version $Rev$ */ public class HostBuilder { private User owner; private Server host; public HostBuilder(User theOwner) { owner = theOwner; } /** * This is the final step in building or compiling a host. The host and its guests (if * there are any) will be persisted, flushed, and evicted from the current hibernate * session. * * <br/><br/> * * The builder does not maintain a reference to a host once it is built; so, calling * <code>build</code> successive times will simply return <code>null</code>. One of the * <i>create</i> methods must be called before every invocation of this method. * * @return The built host whose state will have persisted and synhronized with the * database. The host and its guests will have been removed from the hibernate session * cache. */ public Server build() { if (host == null) { return null; } Server compiledHost; Session session = HibernateFactory.getSession(); session.flush(); session.evict(host); for (Iterator iterator = host.getGuests().iterator(); iterator.hasNext();) { session.evict(iterator.next()); } compiledHost = host; host = null; return compiledHost; } /** * Creates a Server with the Virtualization Host entitlement. * * @return This builder * * @throws Exception if an error occurs */ public HostBuilder createVirtHost() throws Exception { host = ServerTestUtils.createVirtHostWithGuests(owner, 0); return this; } /** * Creates a Server with the Virtualization Platform entitlement. * * @return This builder * * @throws Exception if an error occurs */ public HostBuilder createVirtPlatformHost() throws Exception { host = ServerTestUtils.createVirtPlatformHost(owner); return this; } /** * Creates a server without any of the virtualization entitlements. Note that a non-virt * host is useful in those situations in which a guest consumes physical entitlements. * * @return This builder * * @throws Exception if an error occurs */ public HostBuilder createNonVirtHost() throws Exception { host = ServerTestUtils.createTestSystem(owner); return this; } /** * Creates the specified number of guests for the host under construction. Each guest * will be registered and therefore have an associated system. * * @param numberOfGuests The number of guests to create * * @return This builder * * @throws Exception if an error occurs */ public HostBuilder withGuests(int numberOfGuests) throws Exception { createGuests(owner, numberOfGuests, true); return this; } /** * Creates the specified number of guests for the host under construction. None of the * guests will be registered and therefore will not have an associated system. * * @param numberOfGuests The number of guests to create * * @return This builder * * @throws Exception if an error occurs */ public HostBuilder withUnregisteredGuests(int numberOfGuests) throws Exception { createGuests(owner, numberOfGuests, false); return this; } /** * Creates the specified number of guests for the host under construction. Each guest * will be registered and therefore have an associated system. * * @param guests a map of users to the number of guests to create owned by that user. * This is useful when you want the guests to be in orgs different to * what the host . * * @return This builder * @throws Exception if an error occurs */ public HostBuilder withGuests(Map<User, Integer> guests, boolean register) throws Exception { for (User u : guests.keySet()) { createGuests(u, guests.get(u), register); } return this; } private List<VirtualInstance> createGuests(User user, int numberOfGuests, boolean register) throws Exception { List<VirtualInstance> guests = new LinkedList<VirtualInstance>(); for (int i = 0; i < numberOfGuests; i++) { VirtualInstanceManufacturer vim = new VirtualInstanceManufacturer(user); VirtualInstance vi = null; if (register) { vi = vim.newRegisteredGuestWithoutHost(); } else { vi = vim.newUnregisteredGuest(); } if (host != null) { vi.setConfirmed(1L); host.addGuest(vi); } else { vi.setConfirmed(0L); } guests.add(vi); } return guests; } public List<VirtualInstance> withOrphanedGuests(int numberOfGuests) throws Exception { return createGuests(owner, numberOfGuests, true); } }