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Java > Open Source Codes > com > go > teaservlet > util > cluster > ClusterHook


1 /* ====================================================================
2  * TeaServlet - Copyright (c) 1999-2000 Walt Disney Internet Group
3  * ====================================================================
4  * The Tea Software License, Version 1.1
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21  * if any, must include the following acknowledgment:
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24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
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27  * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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30  * permission, please contact opensource@dig.com.
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52
53 package com.go.teaservlet.util.cluster;
54
55 import java.rmi.server.UnicastRemoteObject JavaDoc;
56 import java.rmi.RemoteException JavaDoc;
57 import java.net.InetAddress JavaDoc;
58 import java.net.UnknownHostException JavaDoc;
59 import java.util.List JavaDoc;
60 import java.util.Vector JavaDoc;
61
62 /******************************************************************************
63  * A fairly generic implementation of the @see Clustered interface.
64  * This class could be used by any sort of server or application that wants to
65  * share information and call methods across a cluster.
66  *
67  * @author Jonathan Colwell
68  * @version
69  * <!--$$Revision:--> 5 <!-- $-->, <!--$$JustDate:--> 6/26/01 <!-- $-->
70  */

71 public class ClusterHook extends UnicastRemoteObject JavaDoc
72     implements Clustered {
73
74     private List JavaDoc mPeers;
75     protected String JavaDoc mClusterName,mServerName;
76
77     public ClusterHook(String JavaDoc clusterName, String JavaDoc serverName)
78         throws RemoteException JavaDoc {
79         
80         super();
81         mPeers = new Vector JavaDoc();
82         mClusterName = clusterName;
83         if (serverName != null) {
84             mServerName = serverName.toLowerCase();
85         }
86     }
87
88     public String JavaDoc getServerName() throws RemoteException JavaDoc {
89
90         if (mServerName == null) {
91             try {
92                 mServerName = InetAddress.getLocalHost()
93                     .getHostName().toLowerCase();
94             }
95             catch (UnknownHostException JavaDoc uhe) {
96                 uhe.printStackTrace();
97             }
98         }
99         return mServerName;
100     }
101
102     public Clustered[] getKnownPeers() throws RemoteException JavaDoc {
103
104         return (Clustered[])mPeers.toArray(new Clustered[mPeers.size()]);
105     }
106
107     public void addPeer(Clustered peer) throws RemoteException JavaDoc {
108
109         mPeers.add(peer);
110     }
111
112     public boolean containsPeer(Clustered peer) throws RemoteException JavaDoc {
113
114         return mPeers.contains(peer);
115     }
116     
117     public void removePeer(Clustered peer) throws RemoteException JavaDoc {
118
119         mPeers.remove(peer);
120     }
121
122     public String JavaDoc getClusterName() throws RemoteException JavaDoc {
123         if (mClusterName == null) {
124             mClusterName = "Unnamed_Cluster";
125         }
126         return mClusterName;
127     }
128 }
129
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