| /* |
| * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.nio.ch; |
| |
| import java.nio.channels.*; |
| import java.net.InetAddress; |
| import java.net.NetworkInterface; |
| import java.util.*; |
| |
| /** |
| * Simple registry of membership keys for a MulticastChannel. |
| * |
| * Instances of this object are not safe by multiple concurrent threads. |
| */ |
| |
| class MembershipRegistry { |
| |
| // map multicast group to keys |
| private Map<InetAddress,List<MembershipKeyImpl>> groups = null; |
| |
| MembershipRegistry() { |
| } |
| |
| /** |
| * Checks registry for membership of the group on the given |
| * network interface. |
| */ |
| MembershipKey checkMembership(InetAddress group, NetworkInterface interf, |
| InetAddress source) |
| { |
| if (groups != null) { |
| List<MembershipKeyImpl> keys = groups.get(group); |
| if (keys != null) { |
| for (MembershipKeyImpl key: keys) { |
| if (key.networkInterface().equals(interf)) { |
| // already a member to receive all packets so return |
| // existing key or detect conflict |
| if (source == null) { |
| if (key.sourceAddress() == null) |
| return key; |
| throw new IllegalStateException("Already a member to receive all packets"); |
| } |
| |
| // already have source-specific membership so return key |
| // or detect conflict |
| if (key.sourceAddress() == null) |
| throw new IllegalStateException("Already have source-specific membership"); |
| if (source.equals(key.sourceAddress())) |
| return key; |
| } |
| } |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Add membership to the registry, returning a new membership key. |
| */ |
| void add(MembershipKeyImpl key) { |
| InetAddress group = key.group(); |
| List<MembershipKeyImpl> keys; |
| if (groups == null) { |
| groups = new HashMap<InetAddress,List<MembershipKeyImpl>>(); |
| keys = null; |
| } else { |
| keys = groups.get(group); |
| } |
| if (keys == null) { |
| keys = new LinkedList<MembershipKeyImpl>(); |
| groups.put(group, keys); |
| } |
| keys.add(key); |
| } |
| |
| /** |
| * Remove a key from the registry |
| */ |
| void remove(MembershipKeyImpl key) { |
| InetAddress group = key.group(); |
| List<MembershipKeyImpl> keys = groups.get(group); |
| if (keys != null) { |
| Iterator<MembershipKeyImpl> i = keys.iterator(); |
| while (i.hasNext()) { |
| if (i.next() == key) { |
| i.remove(); |
| break; |
| } |
| } |
| if (keys.isEmpty()) { |
| groups.remove(group); |
| } |
| } |
| } |
| |
| /** |
| * Invalidate all keys in the registry |
| */ |
| void invalidateAll() { |
| if (groups != null) { |
| for (InetAddress group: groups.keySet()) { |
| for (MembershipKeyImpl key: groups.get(group)) { |
| key.invalidate(); |
| } |
| } |
| } |
| } |
| } |