001: /*
002: * $Id: AxionDBLinksMetaTableUpdater.java,v 1.2 2004/09/02 01:52:08 ahimanikya Exp $
003: * =======================================================================
004: * Copyright (c) 2002 Axion Development Team. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above
011: * copyright notice, this list of conditions and the following
012: * disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The names "Tigris", "Axion", nor the names of its contributors may
020: * not be used to endorse or promote products derived from this
021: * software without specific prior written permission.
022: *
023: * 4. Products derived from this software may not be called "Axion", nor
024: * may "Tigris" or "Axion" appear in their names without specific prior
025: * written permission.
026: *
027: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
028: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
029: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
030: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
031: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
032: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
033: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
034: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
035: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
036: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
037: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
038: * =======================================================================
039: */
040:
041: package org.axiondb.engine.metaupdaters;
042:
043: import org.apache.commons.logging.Log;
044: import org.apache.commons.logging.LogFactory;
045: import org.axiondb.AxionCommand;
046: import org.axiondb.AxionException;
047: import org.axiondb.ColumnIdentifier;
048: import org.axiondb.Database;
049: import org.axiondb.DatabaseLink;
050: import org.axiondb.Literal;
051: import org.axiondb.Row;
052: import org.axiondb.engine.BaseDatabase;
053: import org.axiondb.engine.commands.DeleteCommand;
054: import org.axiondb.engine.rows.SimpleRow;
055: import org.axiondb.event.BaseDatabaseModificationListener;
056: import org.axiondb.event.DatabaseModificationListener;
057: import org.axiondb.event.DatabaseLinkEvent;
058: import org.axiondb.functions.FunctionIdentifier;
059:
060: /**
061: * Updates the <code>AXION_DB_LINKS</code> meta table
062: *
063: * @version $Revision: 1.2 $ $Date: 2004/09/02 01:52:08 $
064: * @author Jonathan Giron
065: */
066: public class AxionDBLinksMetaTableUpdater extends
067: BaseDatabaseModificationListener implements
068: DatabaseModificationListener {
069: private static Log _log = LogFactory
070: .getLog(AxionDBLinksMetaTableUpdater.class);
071: private Database _db = null;
072:
073: public AxionDBLinksMetaTableUpdater(Database db) {
074: _db = db;
075: }
076:
077: protected Row createRowForAddedServer(DatabaseLink server) {
078: String name = server.getName();
079: String url = server.getJdbcUrl();
080: String userName = server.getUserName();
081:
082: SimpleRow row = new SimpleRow(3);
083: row.set(0, name); // link name
084: row.set(1, url); // JDBC URL
085: row.set(2, userName); // user name
086: return row;
087: }
088:
089: public void serverAdded(DatabaseLinkEvent e) {
090: Row row = createRowForAddedServer(e.getExternalDatabaseLink());
091: try {
092: _db.getTable(BaseDatabase.SYSTABLE_DB_LINKS).addRow(row);
093: } catch (AxionException ex) {
094: _log.error(
095: "Unable to mention database link in system tables",
096: ex);
097: }
098: }
099:
100: public void serverDropped(DatabaseLinkEvent e) {
101: FunctionIdentifier fn = new FunctionIdentifier("=");
102: fn.addArgument(new ColumnIdentifier("LINK_NAME"));
103: fn.addArgument(new Literal(e.getExternalDatabaseLink()
104: .getName()));
105: AxionCommand cmd = new DeleteCommand(
106: BaseDatabase.SYSTABLE_DB_LINKS, fn);
107: try {
108: cmd.execute(_db);
109: } catch (AxionException ex) {
110: _log
111: .error(
112: "Unable to remove mention of database link in system tables",
113: ex);
114: }
115: }
116: }
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