| /* |
| * Copyright 1999,2004 The Apache Software Foundation. |
| * |
| * Licensed 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.catalina.tribes; |
| |
| /** |
| * The Member interface, defines a member in the group. |
| * Each member can carry a set of properties, defined by the actual implementation.<BR> |
| * A member is identified by the host/ip/uniqueId<br> |
| * The host is what interface the member is listening to, to receive data<br> |
| * The port is what port the member is listening to, to receive data<br> |
| * The uniqueId defines the session id for the member. This is an important feature |
| * since a member that has crashed and the starts up again on the same port/host is |
| * not guaranteed to be the same member, so no state transfers will ever be confused |
| * @author Filip Hanik |
| * @version $Revision: 303950 $, $Date: 2005-06-09 15:38:30 -0500 (Thu, 09 Jun 2005) $ |
| */ |
| |
| |
| public interface Member { |
| |
| /** |
| * When a member leaves the cluster, the payload of the memberDisappeared member |
| * will be the following bytes. This indicates a soft shutdown, and not a crash |
| */ |
| public static final byte[] SHUTDOWN_PAYLOAD = new byte[] {66, 65, 66, 89, 45, 65, 76, 69, 88}; |
| |
| /** |
| * Returns the name of this node, should be unique within the group. |
| */ |
| public String getName(); |
| |
| /** |
| * Returns the listen host for the ChannelReceiver implementation |
| * @return IPv4 or IPv6 representation of the host address this member listens to incoming data |
| * @see ChannelReceiver |
| */ |
| public byte[] getHost(); |
| |
| /** |
| * Returns the listen port for the ChannelReceiver implementation |
| * @return IPv4 or IPv6 representation of the host address this member listens to incoming data |
| * @see ChannelReceiver |
| */ |
| public int getPort(); |
| |
| /** |
| * Contains information on how long this member has been online. |
| * The result is the number of milli seconds this member has been |
| * broadcasting its membership to the group. |
| * @return nr of milliseconds since this member started. |
| */ |
| public long getMemberAliveTime(); |
| |
| /** |
| * The current state of the member |
| * @return boolean - true if the member is functioning correctly |
| */ |
| public boolean isReady(); |
| /** |
| * The current state of the member |
| * @return boolean - true if the member is suspect, but the crash has not been confirmed |
| */ |
| public boolean isSuspect(); |
| |
| /** |
| * |
| * @return boolean - true if the member has been confirmed to malfunction |
| */ |
| public boolean isFailing(); |
| |
| /** |
| * returns a UUID unique for this member over all sessions. |
| * If the member crashes and restarts, the uniqueId will be different. |
| * @return byte[] |
| */ |
| public byte[] getUniqueId(); |
| |
| /** |
| * returns the payload associated with this member |
| * @return byte[] |
| */ |
| public byte[] getPayload(); |
| |
| /** |
| * returns the command associated with this member |
| * @return byte[] |
| */ |
| public byte[] getCommand(); |
| |
| /** |
| * Domain for this cluster |
| * @return byte[] |
| */ |
| public byte[] getDomain(); |
| } |