JFox Service-Oriented Application Framework

Clover coverage report - JFox Service-Oriented Application Framework - 1.0-RC1

Coverage timestamp: 星期五八月 19 2005 13:21:55 CST

FRAMES NO FRAMES

file stats:	LOC:	263		Methods:	7
	NCLOC:	130		Classes:	1

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Source file

Conditionals

Statements

Methods

TOTAL

DataSourceFactory.java

46.7%

75%

100%

67.4%

 /**
  * @(#) DataSourceFactory.java
  * 
  * JFoxSOAF, Service-Oriented Application Framework
  * 
  * Copyright(c) JFoxSOAF Team
  * 
  * Licensed under the GNU LGPL, Version 2.1 (the "License"); 
  * you may not use this file except in compliance with the License. 
  * You may obtain a copy of the License at  
  * 
  * http://www.gnu.org/copyleft/lesser.html
  * 
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
  * See the License for the specific language governing permissions and 
  * limitations under the License. 
  * 
  * For more information, please visit:
  * http://www.jfox.cn/confluence/display/JFoxSOAF/Home
  * http://www.huihoo.org/jfox/jfoxsoaf
  */
 
 package org.huihoo.jfox.soaf.services.jdbc;
 
 import java.io.IOException;
 import java.io.InputStream;
 import java.security.AccessController;
 import java.security.PrivilegedAction;
 import java.sql.SQLException;
 import java.util.Enumeration;
 import java.util.Hashtable;
 import java.util.Properties;
 
 import javax.sql.DataSource;
 
 import org.huihoo.jfox.soaf.exception.DataSourceConfigurationException;
 import org.huihoo.jfox.soaf.util.resource.ResourceHelper;
 
 /**
  * <p>
  * Factory for creating database connection instances, with discovery and
  * configuration features
  * </p>
  * 
  * @author <a href="mailto:founder_chen@yahoo.com.cn">Peter Cheng </a>
  * @version $Revision: 1.6 $ $Date: 2005/05/22 06:49:48 $
  * @version Revision: 1.0
  */
 
 public abstract class DataSourceFactory {
 
     /**
      * Protected constructor that is not available for public use.
      */
     protected DataSourceFactory() {
     }
 
     /**
      * The previously constructed <code>LogFactory</code> instances, keyed by
      * the <code>ClassLoader</code> with which it was created.
      */
     protected static Hashtable factories = new Hashtable();
 
     /**
      * Get singlton database connection instance.
      */
     public abstract DataSource getInstance()
             throws DataSourceConfigurationException, SQLException;
 
     /**
      * Return the configuration attribute with the specified name (if any), or
      * <code>null</code> if there is no such attribute.
      * 
      * @param name Name of the attribute to return
      */
     public abstract Object getAttribute(String name);
 
     /**
      * Return an array containing the names of all currently defined
      * configuration attributes. If there are no such attributes, a zero length
      * array is returned.
      */
     public abstract String[] getAttributeNames();
 
     /**
      * Remove any configuration attribute associated with the specified name. If
      * there is no such attribute, no action is taken.
      * 
      * @param name Name of the attribute to remove
      */
     public abstract void removeAttribute(String name);
 
     /**
      * Set the configuration attribute with the specified name. Calling this
      * with a <code>null</code> value is equivalent to calling
      * <code>removeAttribute(name)</code>.
      * 
      * @param name Name of the attribute to set
      * @param value Value of the attribute to set, or <code>null</code> to
      *            remove any setting for this attribute
      */
     public abstract void setAttribute(String name, Object value);
 
     public static DataSourceFactory getFactory()
             throws DataSourceConfigurationException {
         // Return any previously registered factory for this class loader
         DataSourceFactory factory = getCachedFactory(DataSourceFactory.class
                 .getClassLoader());
 
         if (factory != null) {
             return factory;
         }
 
         // Load properties file
         Properties props = null;
         try {
             InputStream stream = ResourceHelper
                     .getResourceAsStream(DatabaseConstant.JDBC_FACTORY_PROPERTIES);
 
             if (stream != null) {
                 props = new Properties();
                 props.load(stream);
                 stream.close();
             }
         } catch (IOException e) {
             throw new DataSourceConfigurationException(
                     "Load Database configuration IO exception " + e);
         } catch (SecurityException e) {
             throw new DataSourceConfigurationException(
                     "Database configuration access security exception " + e);
         }
 
         // Second try a properties file.
         if (factory == null && props != null) {
             String factoryClass = props
                     .getProperty(DatabaseConstant.JDBC_DATABASE_FACTORY);
             if (factoryClass != null && !factoryClass.equals("")) {
                 factory = newFactory(factoryClass, DataSourceFactory.class
                         .getClassLoader());
             }
         }
 
         // Third, try the fallback implementation class
         if (factory == null) {
             factory = newFactory(DatabaseConstant.JDBC_DEFAULT_FACTORY,
                     DataSourceFactory.class.getClassLoader());
         }
 
         if (factory != null) {
             /**
              * Always cache using context class loader..
              */
             cacheFactory(DataSourceFactory.class.getClassLoader(), factory);
 
             if (props != null) {
                 Enumeration names = props.propertyNames();
                 while (names.hasMoreElements()) {
                     String name = (String) names.nextElement();
                     String value = props.getProperty(name);
                     factory.setAttribute(name, value);
                 }
             }
         }
 
         return factory;
     }
 
     /**
      * Check cached factories (keyed by classLoader)
      */
     private static DataSourceFactory getCachedFactory(
             ClassLoader contextClassLoader) {
         DataSourceFactory factory = null;
 
         if (contextClassLoader != null) {
             factory = (DataSourceFactory) factories.get(contextClassLoader);
         }
 
         return factory;
     }
 
     private static void cacheFactory(ClassLoader classLoader,
             DataSourceFactory factory) {
         if (classLoader != null && factory != null) {
             factories.put(classLoader, factory);
         }
     }
 
     /**
      * Return a new instance of the specified <code>LogFactory</code>
      * implementation class, loaded by the specified class loader. If that
      * fails, try the class loader used to load this (abstract) LogFactory.
      * 
      * @param factoryClass Fully qualified name of the <code>LogFactory</code>
      *            implementation class
      * @param classLoader ClassLoader from which to load this class
      * @exception DataSourceConfigException if a suitable instance cannot be
      *                created
      */
     protected static DataSourceFactory newFactory(final String factoryClass,
             final ClassLoader classLoader)
             throws DataSourceConfigurationException {
         Object result = AccessController.doPrivileged(new PrivilegedAction() {
 
             public Object run() {
                 try {
                     if (classLoader != null) {
                         try {
                             return classLoader.loadClass(factoryClass)
                                     .newInstance();
                         } catch (ClassNotFoundException ex) {
                             if (classLoader == DataSourceFactory.class
                                     .getClassLoader()) {
                                 // Nothing more to try, onwards.
                                 throw ex;
                             }
                             // ignore exception, continue
                         } catch (NoClassDefFoundError e) {
                             if (classLoader == DataSourceFactory.class
                                     .getClassLoader()) {
                                 throw e;
                             }
 
                         } catch (ClassCastException e) {
 
                             if (classLoader == DataSourceFactory.class
                                     .getClassLoader()) {
                                 throw e;
                             }
                         }
                     }
                     return Class.forName(factoryClass).newInstance();
                 } catch (Exception e) {
                     return new DataSourceConfigurationException(e);
                 }
             }
         });
 
         if (result instanceof DataSourceConfigurationException) {
             throw (DataSourceConfigurationException) result;
         }
 
         return (DataSourceFactory) result;
     }
 
     /**
      * Retrive concreate datasource.
      * 
      * @return PoolDataSource
      * @throws DataSourceConfigurationException
      */
     public static DataSource getDataSource()
             throws DataSourceConfigurationException {
         try {
             return getFactory().getInstance();
         } catch (Exception e) {
             throw new DataSourceConfigurationException(e.getMessage(), e);
         }
     }
 
 }

1		/**
2		* @(#) DataSourceFactory.java
3		*
4		* JFoxSOAF, Service-Oriented Application Framework
5		*
6		* Copyright(c) JFoxSOAF Team
7		*
8		* Licensed under the GNU LGPL, Version 2.1 (the "License");
9		* you may not use this file except in compliance with the License.
10		* You may obtain a copy of the License at
11		*
12		* http://www.gnu.org/copyleft/lesser.html
13		*
14		* Unless required by applicable law or agreed to in writing, software
15		* distributed under the License is distributed on an "AS IS" BASIS,
16		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17		* See the License for the specific language governing permissions and
18		* limitations under the License.
19		*
20		* For more information, please visit:
21		* http://www.jfox.cn/confluence/display/JFoxSOAF/Home
22		* http://www.huihoo.org/jfox/jfoxsoaf
23		*/
24
25		package org.huihoo.jfox.soaf.services.jdbc;
26
27		import java.io.IOException;
28		import java.io.InputStream;
29		import java.security.AccessController;
30		import java.security.PrivilegedAction;
31		import java.sql.SQLException;
32		import java.util.Enumeration;
33		import java.util.Hashtable;
34		import java.util.Properties;
35
36		import javax.sql.DataSource;
37
38		import org.huihoo.jfox.soaf.exception.DataSourceConfigurationException;
39		import org.huihoo.jfox.soaf.util.resource.ResourceHelper;
40
41		/**
42		* <p>
43		* Factory for creating database connection instances, with discovery and
44		* configuration features
45		* </p>
46		*
47		* @author <a href="mailto:founder_chen@yahoo.com.cn">Peter Cheng </a>
48		* @version $Revision: 1.6 $ $Date: 2005/05/22 06:49:48 $
49		* @version Revision: 1.0
50		*/
51
52		public abstract class DataSourceFactory {
53
54		/**
55		* Protected constructor that is not available for public use.
56		*/
57	7	protected DataSourceFactory() {
58		}
59
60		/**
61		* The previously constructed <code>LogFactory</code> instances, keyed by
62		* the <code>ClassLoader</code> with which it was created.
63		*/
64		protected static Hashtable factories = new Hashtable();
65
66		/**
67		* Get singlton database connection instance.
68		*/
69		public abstract DataSource getInstance()
70		throws DataSourceConfigurationException, SQLException;
71
72		/**
73		* Return the configuration attribute with the specified name (if any), or
74		* <code>null</code> if there is no such attribute.
75		*
76		* @param name Name of the attribute to return
77		*/
78		public abstract Object getAttribute(String name);
79
80		/**
81		* Return an array containing the names of all currently defined
82		* configuration attributes. If there are no such attributes, a zero length
83		* array is returned.
84		*/
85		public abstract String[] getAttributeNames();
86
87		/**
88		* Remove any configuration attribute associated with the specified name. If
89		* there is no such attribute, no action is taken.
90		*
91		* @param name Name of the attribute to remove
92		*/
93		public abstract void removeAttribute(String name);
94
95		/**
96		* Set the configuration attribute with the specified name. Calling this
97		* with a <code>null</code> value is equivalent to calling
98		* <code>removeAttribute(name)</code>.
99		*
100		* @param name Name of the attribute to set
101		* @param value Value of the attribute to set, or <code>null</code> to
102		* remove any setting for this attribute
103		*/
104		public abstract void setAttribute(String name, Object value);
105
106	5	public static DataSourceFactory getFactory()
107		throws DataSourceConfigurationException {
108		// Return any previously registered factory for this class loader
109	5	DataSourceFactory factory = getCachedFactory(DataSourceFactory.class
110		.getClassLoader());
111
112	5	if (factory != null) {
113	2	return factory;
114		}
115
116		// Load properties file
117	3	Properties props = null;
118	3	try {
119	3	InputStream stream = ResourceHelper
120		.getResourceAsStream(DatabaseConstant.JDBC_FACTORY_PROPERTIES);
121
122	3	if (stream != null) {
123	3	props = new Properties();
124	3	props.load(stream);
125	3	stream.close();
126		}
127		} catch (IOException e) {
128	0	throw new DataSourceConfigurationException(
129		"Load Database configuration IO exception " + e);
130		} catch (SecurityException e) {
131	0	throw new DataSourceConfigurationException(
132		"Database configuration access security exception " + e);
133		}
134
135		// Second try a properties file.
136	3	if (factory == null && props != null) {
137	3	String factoryClass = props
138		.getProperty(DatabaseConstant.JDBC_DATABASE_FACTORY);
139	3	if (factoryClass != null && !factoryClass.equals("")) {
140	3	factory = newFactory(factoryClass, DataSourceFactory.class
141		.getClassLoader());
142		}
143		}
144
145		// Third, try the fallback implementation class
146	3	if (factory == null) {
147	0	factory = newFactory(DatabaseConstant.JDBC_DEFAULT_FACTORY,
148		DataSourceFactory.class.getClassLoader());
149		}
150
151	3	if (factory != null) {
152		/**
153		* Always cache using context class loader..
154		*/
155	3	cacheFactory(DataSourceFactory.class.getClassLoader(), factory);
156
157	3	if (props != null) {
158	3	Enumeration names = props.propertyNames();
159	3	while (names.hasMoreElements()) {
160	60	String name = (String) names.nextElement();
161	60	String value = props.getProperty(name);
162	60	factory.setAttribute(name, value);
163		}
164		}
165		}
166
167	3	return factory;
168		}
169
170		/**
171		* Check cached factories (keyed by classLoader)
172		*/
173	5	private static DataSourceFactory getCachedFactory(
174		ClassLoader contextClassLoader) {
175	5	DataSourceFactory factory = null;
176
177	5	if (contextClassLoader != null) {
178	5	factory = (DataSourceFactory) factories.get(contextClassLoader);
179		}
180
181	5	return factory;
182		}
183
184	3	private static void cacheFactory(ClassLoader classLoader,
185		DataSourceFactory factory) {
186	3	if (classLoader != null && factory != null) {
187	3	factories.put(classLoader, factory);
188		}
189		}
190
191		/**
192		* Return a new instance of the specified <code>LogFactory</code>
193		* implementation class, loaded by the specified class loader. If that
194		* fails, try the class loader used to load this (abstract) LogFactory.
195		*
196		* @param factoryClass Fully qualified name of the <code>LogFactory</code>
197		* implementation class
198		* @param classLoader ClassLoader from which to load this class
199		* @exception DataSourceConfigException if a suitable instance cannot be
200		* created
201		*/
202	4	protected static DataSourceFactory newFactory(final String factoryClass,
203		final ClassLoader classLoader)
204		throws DataSourceConfigurationException {
205	4	Object result = AccessController.doPrivileged(new PrivilegedAction() {
206
207	4	public Object run() {
208	4	try {
209	4	if (classLoader != null) {
210	4	try {
211	4	return classLoader.loadClass(factoryClass)
212		.newInstance();
213		} catch (ClassNotFoundException ex) {
214	0	if (classLoader == DataSourceFactory.class
215		.getClassLoader()) {
216		// Nothing more to try, onwards.
217	0	throw ex;
218		}
219		// ignore exception, continue
220		} catch (NoClassDefFoundError e) {
221	0	if (classLoader == DataSourceFactory.class
222		.getClassLoader()) {
223	0	throw e;
224		}
225
226		} catch (ClassCastException e) {
227
228	0	if (classLoader == DataSourceFactory.class
229		.getClassLoader()) {
230	0	throw e;
231		}
232		}
233		}
234	0	return Class.forName(factoryClass).newInstance();
235		} catch (Exception e) {
236	0	return new DataSourceConfigurationException(e);
237		}
238		}
239		});
240
241	4	if (result instanceof DataSourceConfigurationException) {
242	0	throw (DataSourceConfigurationException) result;
243		}
244
245	4	return (DataSourceFactory) result;
246		}
247
248		/**
249		* Retrive concreate datasource.
250		*
251		* @return PoolDataSource
252		* @throws DataSourceConfigurationException
253		*/
254	3	public static DataSource getDataSource()
255		throws DataSourceConfigurationException {
256	3	try {
257	3	return getFactory().getInstance();
258		} catch (Exception e) {
259	0	throw new DataSourceConfigurationException(e.getMessage(), e);
260		}
261		}
262
263		}