ApplicationInfo


1   /*
2    * Copyright (c) 2003 by The Jackass Team
3    * Licensed under the Open Software License version 2.0
4    */
5   package ve.luz.ica.jackass.daemon;
6   
7   import java.util.Iterator  ;
8   import java.util.Set  ;
9   import java.util.LinkedHashSet  ;
10  import java.io.Serializable  ;
11  import java.io.ObjectInputStream  ;
12  import java.io.IOException  ;
13  import java.io.InvalidObjectException  ;
14  
15  import ve.luz.ica.jackass.deploy.daemon.NodeDeployer;
16  
17  /**
18   * Contains Application related information. The information consists
19   * of a list of NodeDeployes and a list of name server entries of application
20   * components.
21   * @author Guido Urdaneta
22   */
23  public final class ApplicationInfo implements Serializable  
24  {
25      private static final String   ERR_NULL_VAR = "Invalid NULL instance variable";
26      private static final String   ERR_NULL_ENTRY = "Invalid NULL entry";
27      private Set   nodeDeployers;
28      private Set   componentNSNames;
29  
30      /**
31       * Creates an empty ApplicationInfo.
32       */
33      public ApplicationInfo()
34      {
35          nodeDeployers = new LinkedHashSet  ();
36          componentNSNames = new LinkedHashSet  ();
37      }
38  
39      /**
40       * Adds a NodeDeployer to the application.
41       * @param nd the NodeDeployer
42       */
43      public void addNodeDeployer(NodeDeployer nd)
44      {
45          nodeDeployers.add(nd);
46      }
47  
48      /**
49       * Adds a String with the Name Service entry of a component.
50       * @param name the NameService entry
51       */
52      public void addComponentNSName(String   name)
53      {
54          componentNSNames.add(name);
55      }
56  
57      /**
58       * Removes a NodeDeployer from the application. Do NOT use this
59       * method if you are iterating. In the latter case use Iterator.remove()
60       * @param nd the NodeDeployer to remove
61       */
62      public void removeNodeDeployer(NodeDeployer nd)
63      {
64          nodeDeployers.remove(nd);
65      }
66  
67      /**
68       * Returns an iterator over the NodeDeployers associated to this application.
69       * @return the iterator
70       * @see NodeDeployer
71       */
72      public Iterator   nodeDeployerIterator()
73      {
74          return nodeDeployers.iterator();
75      }
76  
77      /**
78       * Returns an iterator over Strings with the name service
79       * entries of the components of the application
80       * @return the iterator
81       */
82      public Iterator   componentNSNamesIterator()
83      {
84          return componentNSNames.iterator();
85      }
86  
87      /**
88       * Verifies the validity of an instance when it is being deserialized.
89       * @param s the input stream
90       * @throws java.io.InvalidObjectException when the deserialized object is invalid
91       * @throws java.io.IOException when an IO error occurs
92       * @throws ClassNotFoundException when an unexpected error occurs
93       */
94      private void readObject(ObjectInputStream   s) throws IOException  , ClassNotFoundException  
95      {
96          s.defaultReadObject();
97  
98          if (this.nodeDeployers == null || this.componentNSNames == null)
99          {
100             throw new InvalidObjectException  (ERR_NULL_VAR);
101         }
102 
103         for (Iterator   i = nodeDeployers.iterator(); i.hasNext();)
104         {
105             NodeDeployer nd = (NodeDeployer) i.next();
106             if (nd == null)
107             {
108                 throw new InvalidObjectException  (ERR_NULL_ENTRY);
109             }
110         }
111 
112         for (Iterator   i = componentNSNames.iterator(); i.hasNext();)
113         {
114             String   nsn = (String  ) i.next();
115             if (nsn == null)
116             {
117                 throw new InvalidObjectException  (ERR_NULL_ENTRY);
118             }
119         }
120     }
121 }
122
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