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Java > Open Source Codes > org > objectweb > cjdbc > controller > scheduler > raidb0 > RAIDb0PassThroughLevelScheduler


1 /**
2  * C-JDBC: Clustered JDBC.
3  * Copyright (C) 2002-2005 French National Institute For Research In Computer
4  * Science And Control (INRIA).
5  * Contact: c-jdbc@objectweb.org
6  *
7  * This library is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU Lesser General Public License as published by the
9  * Free Software Foundation; either version 2.1 of the License, or any later
10  * version.
11  *
12  * This library is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
15  * for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public License
18  * along with this library; if not, write to the Free Software Foundation,
19  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20  *
21  * Initial developer(s): Emmanuel Cecchet.
22  * Contributor(s): Jean-Bernard van Zuylen.
23  */
24
25 package org.objectweb.cjdbc.controller.scheduler.raidb0;
26
27 import java.sql.SQLException JavaDoc;
28
29 import org.objectweb.cjdbc.common.exceptions.RollbackException;
30 import org.objectweb.cjdbc.common.sql.AbstractWriteRequest;
31 import org.objectweb.cjdbc.common.sql.ParsingGranularities;
32 import org.objectweb.cjdbc.common.sql.SelectRequest;
33 import org.objectweb.cjdbc.common.sql.StoredProcedure;
34 import org.objectweb.cjdbc.common.xml.DatabasesXmlTags;
35 import org.objectweb.cjdbc.controller.requestmanager.RAIDbLevels;
36 import org.objectweb.cjdbc.controller.scheduler.AbstractScheduler;
37
38 /**
39  * This scheduler provides scheduling for RAIDb-0 controllers. Read and write
40  * can occur in parallel, serializability being ensured by the load balancer.
41  *
42  * @author <a HREF="mailto:Emmanuel.Cecchet@inria.fr">Emmanuel Cecchet </a>
43  * @author <a HREF="mailto:jbvanzuylen@transwide.com">Jean-Bernard van Zuylen
44  * </a>
45  * @version 1.0
46  */
47 public class RAIDb0PassThroughLevelScheduler extends AbstractScheduler
48 {
49
50   //
51 // How the code is organized ?
52 //
53 // 1. Member variables
54 // 2. Constructor
55 // 3. Request handling
56 // 4. Transaction management
57 // 5. Debug/Monitoring
58 //
59
60   private long requestId;
61
62   //
63 // Constructor
64 //
65
66   /**
67    * Creates a new Single Database Scheduler
68    */
69   public RAIDb0PassThroughLevelScheduler()
70   {
71     super(RAIDbLevels.RAIDb0, ParsingGranularities.NO_PARSING);
72
73     requestId = 0;
74   }
75
76   //
77 // Request Handling
78 //
79
80   /**
81    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#scheduleReadRequest(SelectRequest)
82    */
83   public final synchronized void scheduleReadRequest(SelectRequest request)
84   {
85     request.setId(requestId++);
86   }
87
88   /**
89    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#readCompletedNotify(SelectRequest)
90    */
91   public final void readCompletedNotify(SelectRequest request)
92   {
93   }
94
95   /**
96    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#scheduleWriteRequest(AbstractWriteRequest)
97    */
98   public final synchronized void scheduleNonSuspendedWriteRequest(
99       AbstractWriteRequest request)
100   {
101     request.setId(requestId++);
102   }
103
104   /**
105    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#notifyWriteCompleted(AbstractWriteRequest)
106    */
107   public final void notifyWriteCompleted(AbstractWriteRequest request)
108   {
109   }
110
111   /**
112    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#scheduleNonSuspendedStoredProcedure(org.objectweb.cjdbc.common.sql.StoredProcedure)
113    */
114   public final synchronized void scheduleNonSuspendedStoredProcedure(
115       StoredProcedure proc) throws SQLException JavaDoc, RollbackException
116   {
117     proc.setId(requestId++);
118   }
119
120   /**
121    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#notifyStoredProcedureCompleted(org.objectweb.cjdbc.common.sql.StoredProcedure)
122    */
123   public final void notifyStoredProcedureCompleted(StoredProcedure proc)
124   {
125   }
126
127   //
128 // Transaction Management
129 //
130
131   /**
132    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#commitTransaction(long)
133    */
134   protected final void commitTransaction(long transactionId)
135   {
136   }
137
138   /**
139    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#rollbackTransaction(long)
140    */
141   protected final void rollbackTransaction(long transactionId)
142   {
143   }
144
145   /**
146    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#rollbackTransaction(long,
147    * String)
148    */
149   protected final void rollbackTransaction(long transactionId,
150       String JavaDoc savepointName)
151   {
152   }
153
154   /**
155    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#setSavepointTransaction(long,
156    * String)
157    */
158   protected final void setSavepointTransaction(long transactionId, String JavaDoc name)
159   {
160   }
161
162   /**
163    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#releaseSavepointTransaction(long,
164    * String)
165    */
166   protected final void releaseSavepointTransaction(long transactionId,
167       String JavaDoc name)
168   {
169   }
170
171   //
172 // Debug/Monitoring
173 //
174 /**
175    * @see org.objectweb.cjdbc.controller.scheduler.AbstractScheduler#getXmlImpl()
176    */
177   public String JavaDoc getXmlImpl()
178   {
179     StringBuffer JavaDoc info = new StringBuffer JavaDoc();
180     info.append("<" + DatabasesXmlTags.ELT_RAIDb0Scheduler + " "
181         + DatabasesXmlTags.ATT_level + "=\"" + DatabasesXmlTags.VAL_passThrough
182         + "\"/>");
183     return info.toString();
184   }
185 }
186
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