Source Code Cross Referenced for DistributedVirtualDatabaseMessage.java in  » Database-JDBC-Connection-Pool » sequoia-2.10.9 » org » continuent » sequoia » controller » virtualdatabase » protocol » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » sequoia 2.10.9 » org.continuent.sequoia.controller.virtualdatabase.protocol 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /**
02:         * Sequoia: Database clustering technology.
03:         * Copyright (C) 2006 Continuent, Inc.
04:         * Contact: sequoia@continuent.org
05:         * 
06:         * Licensed under the Apache License, Version 2.0 (the "License");
07:         * you may not use this file except in compliance with the License.
08:         * You may obtain a copy of the License at
09:         * 
10:         * http://www.apache.org/licenses/LICENSE-2.0
11:         * 
12:         * Unless required by applicable law or agreed to in writing, software
13:         * distributed under the License is distributed on an "AS IS" BASIS,
14:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15:         * See the License for the specific language governing permissions and
16:         * limitations under the License. 
17:         *
18:         * Initial developer(s): Emmanuel Cecchet.
19:         * Contributor(s): ______________________.
20:         */package org.continuent.sequoia.controller.virtualdatabase.protocol;
21:
22:        import java.io.Serializable;
23:
24:        import org.continuent.hedera.common.Member;
25:        import org.continuent.sequoia.controller.virtualdatabase.DistributedVirtualDatabase;
26:
27:        /**
28:         * This interface defines a DistributedVirtualDatabaseMessage
29:         * 
30:         * @author <a href="mailto:emmanuel.cecchet@continuent.com">Emmanuel Cecchet</a>
31:         * @version 1.0
32:         */
33:        public abstract class DistributedVirtualDatabaseMessage implements 
34:                Serializable {
35:
36:            /**
37:             * Single threaded part of the handler that will execute in mutual execution
38:             * in the total order delivery thread of the group communication.
39:             * <p>
40:             * NEVER BLOCK IN THIS HANDLER !!!
41:             * 
42:             * @param dvdb the local instance of the distributed virtual database
43:             * @param sender the message sender
44:             * @return an optional value to be passed to the multithreaded handler
45:             */
46:            public abstract Object handleMessageSingleThreaded(
47:                    DistributedVirtualDatabase dvdb, Member sender);
48:
49:            /**
50:             * Multi-threaded part of the message handler.
51:             * 
52:             * @param dvdb the local instance of the distributed virtual database
53:             * @param sender the message sender
54:             * @param handleMessageSingleThreadedResult value returned by the single
55:             *          threaded handler
56:             * @return a Serializable object to be returned to the sender
57:             */
58:            public abstract Serializable handleMessageMultiThreaded(
59:                    DistributedVirtualDatabase dvdb, Member sender,
60:                    Object handleMessageSingleThreadedResult);
61:
62:            /**
63:             * Cancel the message in a "best effort"-basis. Should try to undo message
64:             * side-effects and clean-up reources.
65:             * 
66:             * @param dvdb the local instance of the distributed virtual database
67:             */
68:            public void cancel(DistributedVirtualDatabase dvdb) {
69:                // Does nothing by default.
70:            }
71:
72:        }
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