Source Code Cross Referenced for EmbedPooledConnection40.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » jdbc » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.jdbc 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.jdbc.EmbedPooledConnection40
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to You under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        package org.apache.derby.jdbc;
023:
024:        import java.sql.Connection;
025:        import java.sql.SQLException;
026:        import java.util.Enumeration;
027:        import java.util.Vector;
028:        import java.sql.PreparedStatement;
029:        import javax.sql.StatementEvent;
030:        import javax.sql.StatementEventListener;
031:
032:        /** 
033:         A PooledConnection object is a connection object that provides hooks for
034:         connection pool management.
035:
036:         <P>This is Derby's implementation of a PooledConnection for use in
037:         the following environments:
038:         <UL>
039:         <LI> JDBC 4.0 - J2SE 6.0
040:         </UL>
041:
042:         */
043:        class EmbedPooledConnection40 extends EmbedPooledConnection {
044:
045:            //using generics to avoid casting problems
046:            protected final Vector<StatementEventListener> statementEventListeners = new Vector<StatementEventListener>();
047:
048:            EmbedPooledConnection40(ReferenceableDataSource ds, String user,
049:                    String password, boolean requestPassword)
050:                    throws SQLException {
051:                super (ds, user, password, requestPassword);
052:            }
053:
054:            /**
055:             * Removes the specified <code>StatementEventListener</code> from the list of 
056:             * components that will be notified when the driver detects that a 
057:             * <code>PreparedStatement</code> has been closed or is invalid.
058:             * <p> 
059:             * 
060:             * @param listener	the component which implements the
061:             * <code>StatementEventListener</code> interface that was previously 
062:             * registered with this <code>PooledConnection</code> object
063:             * <p>
064:             * @since 1.6
065:             */
066:            public void removeStatementEventListener(
067:                    StatementEventListener listener) {
068:                if (listener == null)
069:                    return;
070:                statementEventListeners.removeElement(listener);
071:            }
072:
073:            /**
074:             * Registers a <code>StatementEventListener</code> with this 
075:             * <code>PooledConnection</code> object.  Components that 
076:             * wish to be notified when  <code>PreparedStatement</code>s created by the
077:             * connection are closed or are detected to be invalid may use this method 
078:             * to register a <code>StatementEventListener</code> with this 
079:             * <code>PooledConnection</code> object.
080:             * <p>
081:             * 
082:             * @param listener	an component which implements the 
083:             * <code>StatementEventListener</code> interface that is to be registered
084:             * with this <code>PooledConnection</code> object
085:             * <p>
086:             * @since 1.6
087:             */
088:            public void addStatementEventListener(
089:                    StatementEventListener listener) {
090:                if (!isActive)
091:                    return;
092:                if (listener == null)
093:                    return;
094:                statementEventListeners.addElement(listener);
095:            }
096:
097:            /**
098:             * Raise the statementClosed event for all the listeners when the
099:             * corresponding events occurs
100:             * @param statement PreparedStatement
101:             */
102:            public void onStatementClose(PreparedStatement statement) {
103:                if (!statementEventListeners.isEmpty()) {
104:                    StatementEvent event = new StatementEvent(this , statement);
105:                    //synchronized block on statementEventListeners to make it thread
106:                    //safe
107:                    synchronized (statementEventListeners) {
108:                        for (StatementEventListener l : statementEventListeners) {
109:                            l.statementClosed(event);
110:                        }
111:                    }
112:                }
113:            }
114:
115:            /**
116:             * Raise the statementErrorOccurred event for all the listeners when the
117:             * corresponding events occurs
118:             * @param statement PreparedStatement
119:             * @param sqle      SQLException
120:             */
121:            public void onStatementErrorOccurred(PreparedStatement statement,
122:                    SQLException sqle) {
123:                if (!statementEventListeners.isEmpty()) {
124:                    StatementEvent event = new StatementEvent(this , statement,
125:                            sqle);
126:                    //synchronized block on statementEventListeners to make it thread
127:                    //safe
128:                    synchronized (statementEventListeners) {
129:                        for (StatementEventListener l : statementEventListeners) {
130:                            l.statementErrorOccurred(event);
131:                        }
132:                    }
133:                }
134:            }
135:        }
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