Source Code Cross Referenced for JDBCBaseProvider.java in  » Portal » Open-Portal » com » forthgo » jspwiki » jdbcprovider » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Portal » Open Portal » com.forthgo.jspwiki.jdbcprovider 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:            JSPWiki - a JSP-based WikiWiki clone.
003:
004:            Copyright (C) 2004-2005 Xan Gregg (xan.gregg@forthgo.com)
005:
006:            This program is free software; you can redistribute it and/or modify
007:            it under the terms of the GNU Lesser General Public License as published by
008:            the Free Software Foundation; either version 2.1 of the License, or
009:            (at your option) any later version.
010:
011:            This program is distributed in the hope that it will be useful,
012:            but WITHOUT ANY WARRANTY; without even the implied warranty of
013:            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014:            GNU Lesser General Public License for more details.
015:
016:            You should have received a copy of the GNU Lesser General Public License
017:            along with this program; if not, write to the Free Software
018:            Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
019:         */
020:        package com.forthgo.jspwiki.jdbcprovider;
021:
022:        import com.ecyrd.jspwiki.NoRequiredPropertyException;
023:        import com.ecyrd.jspwiki.TextUtil;
024:        import com.ecyrd.jspwiki.WikiEngine;
025:        import org.apache.log4j.Category;
026:
027:        import java.io.IOException;
028:        import java.sql.*;
029:        import java.util.Properties;
030:
031:        import javax.naming.Context;
032:        import javax.naming.InitialContext;
033:        import javax.naming.NamingException;
034:        import javax.sql.DataSource;
035:
036:        /*
037:         * History:
038:         *   2006-02-10 SU Use JNDI DataSource to create database connection.
039:         *                 Got rid of using CoreConnectionPool class.  
040:         *                 Pooling can take place in webcontainer or jdbc driver.
041:         *   2005-09-28 XG Made default number of cached connections be 0 after seeing resource
042:         *                 problems with other values on Linux.
043:         *   2005-08-30 XG Fixed bug: was using wrong property name for cached connection setting.
044:         */
045:
046:        /**
047:         * An abstract base class for JDBC-based providers.
048:         */
049:        public abstract class JDBCBaseProvider {
050:
051:            public void initialize(WikiEngine engine, Properties properties)
052:                    throws NoRequiredPropertyException, IOException {
053:                try {
054:                    checkConnection();
055:                } catch (SQLException e) {
056:                    throw new IOException("SQL Exception: " + e.getMessage());
057:                }
058:            }
059:
060:            private String getRequired(Properties properties, String name)
061:                    throws NoRequiredPropertyException {
062:                return WikiEngine.getRequiredProperty(properties,
063:                        getPropertyBase() + name);
064:            }
065:
066:            /**
067:             * Returns a string to use as a prefix for property names.
068:             * 
069:             * @return property name prefix
070:             */
071:            protected abstract String getPropertyBase();
072:
073:            public abstract Category getLog();
074:
075:            protected void debug(String message) {
076:                getLog().debug(message);
077:            }
078:
079:            protected void info(String message) {
080:                getLog().info(message);
081:            }
082:
083:            protected void error(String message, Throwable t) {
084:                getLog().error(message, t);
085:            }
086:
087:            private void checkConnection() throws SQLException {
088:                Connection connection = null;
089:                try {
090:                    connection = getConnection();
091:                } catch (SQLException e) {
092:                    error("Unable to get database connection", e);
093:                    throw e;
094:                } finally {
095:                    releaseConnection(connection);
096:                }
097:            }
098:
099:            public boolean isConnectionOK(Connection connection) {
100:                try {
101:                    String sql = "SELECT 1 FROM " + getCheckAliveTableName();
102:                    Statement stmt = connection.createStatement();
103:                    ResultSet rs = stmt.executeQuery(sql);
104:                    rs.close();
105:                    stmt.close();
106:                } catch (SQLException se) {
107:                    return false;
108:                }
109:                return true;
110:            }
111:
112:            public abstract String getCheckAliveTableName();
113:
114:            protected Connection getConnection() throws SQLException {
115:                String datasource = "java:comp/env/jdbc/WikiDB";
116:                Connection conn = null;
117:                try {
118:                    Context ctx = new InitialContext();
119:                    conn = ((DataSource) ctx.lookup(datasource))
120:                            .getConnection();
121:                } catch (NamingException ne) {
122:                    error("exception looking up datasource name=" + datasource,
123:                            ne);
124:                    throw new RuntimeException(
125:                            "JDBCBaseProvider.getConnection(): Failed to look up datasource="
126:                                    + datasource, ne);
127:                }
128:
129:                return conn;
130:            }
131:
132:            protected void releaseConnection(Connection connection) {
133:                if (connection == null)
134:                    return; // happens if we are called in a finally clause of a failed getConnection
135:                try {
136:                    if (connection != null && !connection.isClosed()) {
137:                        connection.close();
138:                    }
139:                } catch (SQLException e) {
140:                    error("connection failed to close", e);
141:                }
142:            }
143:
144:            /**
145:             * Checks that a table by the given name exists.
146:             * 
147:             * @param tableName the sql table name
148:             * @throws SQLException if the table query fails
149:             */
150:            protected void checkTable(String tableName) throws SQLException {
151:                Connection connection = null;
152:                try {
153:                    connection = getConnection();
154:                    String sql = "SELECT COUNT(*) FROM " + tableName;
155:                    Statement stmt = connection.createStatement();
156:                    ResultSet rs = stmt.executeQuery(sql);
157:                    rs.close();
158:                    stmt.close();
159:                } catch (SQLException se) {
160:                    error("Unable to find the table: " + tableName, se);
161:                    throw se;
162:                } finally {
163:                    releaseConnection(connection);
164:                }
165:            }
166:        }
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