SubscriptionChangeRequest


1   /*
2    * Created on Jul 28, 2005
3    */
4   package com.nightlabs.ipanema.jdo.cache;
5   
6   
7   /**
8    * @author Marco Schulze - marco at nightlabs dot de
9    */
10  public class SubscriptionChangeRequest
11  {
12      public static final byte ACTION_ADD = 0;
13      public static final byte ACTION_REMOVE = 1;
14  
15      private static String  [] ACTIONS = new String  [] {"add", "remove"};
16  
17      private byte action;
18      private Object   objectID;
19      private long createDT = System.currentTimeMillis();
20      private long delayMSec;
21  
22      /**
23       * @param action One of {@link #ACTION_ADD} or {@link #ACTION_REMOVE}
24       * @param objectID The objectID for which to either add or remove a listener.
25       * @param delayMSec The action can be done immediately (means as soon as possible,
26       *      because it's async and periodical) or it can be delayed for a certain time
27       *      specified in millisec.
28       */
29      public SubscriptionChangeRequest(byte action, Object   objectID, long delayMSec)
30      {
31          if (action != ACTION_ADD && action != ACTION_REMOVE)
32              throw new IllegalArgumentException  ("action \""+action+"\" invalid! Must be either ACTION_ADD=\""+ACTION_ADD+"\" or ACTION_REMOVE=\""+ACTION_REMOVE+"\"");
33  
34          this.action = action;
35  
36          if (null == objectID)
37              throw new NullPointerException  ("objectID");
38          this.objectID = objectID;
39  
40          if (delayMSec < 0)
41              throw new IllegalArgumentException  ("delayMSec < 0!!! Must be >= 0!");
42          this.delayMSec = delayMSec;
43      }
44  
45      /**
46       * @return Returns the action.
47       */
48      public byte getAction()
49      {
50          return action;
51      }
52      /**
53       * @return Returns the objectID.
54       */
55      public Object   getObjectID()
56      {
57          return objectID;
58      }
59      /**
60       * @return Returns the createDT.
61       */
62      public long getCreateDT()
63      {
64          return createDT;
65      }
66      /**
67       * @return Returns the delayMSec.
68       */
69      public long getDelayMSec()
70      {
71          return delayMSec;
72      }
73      /**
74       * @return Returns the sum of <tt>createDT</tt> and <tt>delayMSec</tt>.
75       */
76      public long getScheduledActionDT()
77      {
78          return createDT + delayMSec;
79      }
80  
81      private transient String   thisString = null;
82      /**
83       * @see java.lang.Object#toString()
84       */
85      public String   toString()
86      {
87          if (thisString == null) {
88              StringBuffer   sb = new StringBuffer  ();
89              sb.append(this.getClass().getName());
90              sb.append('{');
91              sb.append("action=");
92              sb.append(ACTIONS[action]);
93              sb.append(';');
94              sb.append("objectID=");
95              sb.append(objectID);
96              sb.append(';');
97              sb.append("delayMSec=");
98              sb.append(delayMSec);
99              sb.append('}');
100 
101             thisString = sb.toString();
102         }
103 
104         return thisString;
105     }
106 }
107
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