##### Coverage Report - org.apache.turbine.services.assemblerbroker.util.java.JavaBaseFactory

Classes in this File | Line Coverage | Branch Coverage | Complexity
JavaBaseFactory |
68% | 28/41
64% | 9/14
| 5.0;5

1 |  |
     package org.apache.turbine.services.assemblerbroker.util.java;
2 |  |
3 |  |
4 |  |
     /*
5 |  |
      * Licensed to the Apache Software Foundation (ASF) under one
6 |  |
      * or more contributor license agreements.  See the NOTICE file
7 |  |
      * distributed with this work for additional information
8 |  |
      * regarding copyright ownership.  The ASF licenses this file
9 |  |
      * to you under the Apache License, Version 2.0 (the
10 |  |
      * "License"); you may not use this file except in compliance
11 |  |
      * with the License.  You may obtain a copy of the License at
12 |  |
      *
13 |  |
      *   http://www.apache.org/licenses/LICENSE-2.0
14 |  |
      *
15 |  |
      * Unless required by applicable law or agreed to in writing,
16 |  |
      * software distributed under the License is distributed on an
17 |  |
      * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18 |  |
      * KIND, either express or implied.  See the License for the
19 |  |
      * specific language governing permissions and limitations
20 |  |
      * under the License.
21 |  |
      */
22 |  |
23 |  |
     import java.util.List;
24 |  |
     import java.util.concurrent.ConcurrentHashMap;
25 |  |
26 |  |
     import org.apache.commons.lang.StringUtils;
27 |  |
     import org.apache.commons.logging.Log;
28 |  |
     import org.apache.commons.logging.LogFactory;
29 |  |
     import org.apache.turbine.modules.Assembler;
30 |  |
     import org.apache.turbine.modules.GenericLoader;
31 |  |
     import org.apache.turbine.modules.Loader;
32 |  |
     import org.apache.turbine.services.assemblerbroker.util.AssemblerFactory;
33 |  |
34 |  |
     /**
35 |  |
      * A screen factory that attempts to load a java class from
36 |  |
      * the module packages defined in the TurbineResource.properties.
37 |  |
      *
38 |  |
      * @author <a href="mailto:leon@opticode.co.za">Leon Messerschmidt</a>
39 |  |
      * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
40 |  |
      * @param <T> the specialized assembler type
41 |  |
      */
42 | 258 |
     public abstract class JavaBaseFactory<T extends Assembler>
43 |  |
         implements AssemblerFactory<T>
44 |  |
     {
45 |  |
         /** A vector of packages. */
46 | 33 |
         private static List<String> packages = GenericLoader.getPackages();
47 |  |
48 |  |
         /** Logging */
49 | 258 |
         protected Log log = LogFactory.getLog(this.getClass());
50 |  |
51 |  |
         /**
52 |  |
          * A cache for previously obtained Class instances, which we keep in order
53 |  |
          * to reduce the Class.forName() overhead (which can be sizable).
54 |  |
          */
55 | 258 |
         private final ConcurrentHashMap<String, Class<T>> classCache = new ConcurrentHashMap<String, Class<T>>();
56 |  |
57 |  |
         /**
58 |  |
          * Get an Assembler.
59 |  |
          *
60 |  |
          * @param packageName java package name
61 |  |
          * @param name name of the requested Assembler
62 |  |
          * @return an Assembler
63 |  |
          */
64 |  |
         @SuppressWarnings("unchecked")
65 |  |
         public T getAssembler(String packageName, String name)
66 |  |
         {
67 | 161 |
             T assembler = null;
68 |  |
69 | 161 |
             if (log.isDebugEnabled())
70 |  |
             {
71 | 161 |
                 log.debug("Class Fragment is " + name);
72 |  |
             }
73 |  |
74 | 161 |
             if (StringUtils.isNotEmpty(name))
75 |  |
             {
76 | 161 |
                 for (String p : packages)
77 |  |
                 {
78 | 256 |
                     StringBuilder sb = new StringBuilder();
79 |  |
80 | 256 |
                     sb.append(p).append('.').append(packageName).append('.').append(name);
81 | 256 |
                     String className = sb.toString();
82 |  |
83 | 256 |
                     if (log.isDebugEnabled())
84 |  |
                     {
85 | 256 |
                         log.debug("Trying " + className);
86 |  |
                     }
87 |  |
88 |  |
                     try
89 |  |
                     {
90 | 256 |
                         Class<T> servClass = classCache.get(className);
91 | 256 |
                         if (servClass == null)
92 |  |
                         {
93 | 228 |
                             servClass = (Class<T>) Class.forName(className);
94 | 70 |
                             Class<T> _servClass = classCache.putIfAbsent(className, servClass);
95 | 70 |
                             if (_servClass != null)
96 |  |
                             {
97 | 0 |
                                 servClass = _servClass;
98 |  |
                             }
99 |  |
                         }
100 | 98 |
                         assembler = servClass.newInstance();
101 | 98 |
                         break; // for()
102 |  |
                     }
103 | 158 |
                     catch (ClassNotFoundException cnfe)
104 |  |
                     {
105 |  |
                         // Do this so we loop through all the packages.
106 | 158 |
                         log.debug(className + ": Not found");
107 |  |
                     }
108 | 0 |
                     catch (NoClassDefFoundError ncdfe)
109 |  |
                     {
110 |  |
                         // Do this so we loop through all the packages.
111 | 0 |
                         log.debug(className + ": No Class Definition found");
112 |  |
                     }
113 | 0 |
                     catch (ClassCastException cce)
114 |  |
                     {
115 |  |
                         // This means trouble!
116 |  |
                         // Alternatively we can throw this exception so
117 |  |
                         // that it will appear on the client browser
118 | 0 |
                         log.error("Could not load "+className, cce);
119 | 0 |
                         break; // for()
120 |  |
                     }
121 | 0 |
                     catch (InstantiationException ine)
122 |  |
                     {
123 |  |
                         // This means trouble!
124 |  |
                         // Alternatively we can throw this exception so
125 |  |
                         // that it will appear on the client browser
126 | 0 |
                         log.error("Could not load "+className, ine);
127 | 0 |
                         break; // for()
128 |  |
                     }
129 | 0 |
                     catch (IllegalAccessException ilae)
130 |  |
                     {
131 |  |
                         // This means trouble!
132 |  |
                         // Alternatively we can throw this exception so
133 |  |
                         // that it will appear on the client browser
134 | 0 |
                         log.error("Could not load "+className, ilae);
135 | 0 |
                         break; // for()
136 | 158 |
                     }
137 |  |
                     // With ClassCastException, InstantiationException we hit big problems
138 | 158 |
                 }
139 |  |
             }
140 |  |
141 | 161 |
             if (log.isDebugEnabled())
142 |  |
             {
143 | 161 |
                 log.debug("Returning: " + assembler);
144 |  |
             }
145 |  |
146 | 161 |
             return assembler;
147 |  |
         }
148 |  |
149 |  |
         /**
150 |  |
          * Get the loader for this type of assembler
151 |  |
          *
152 |  |
          * @return a Loader
153 |  |
          */
154 |  |
         @Override
155 |  |
         public abstract Loader<T> getLoader();
156 |  |
157 |  |
         /**
158 |  |
          * Get the size of a possibly configured cache
159 |  |
          *
160 |  |
          * @return the size of the cache in bytes
161 |  |
          */
162 |  |
         @Override
163 |  |
         public int getCacheSize()
164 |  |
         {
165 | 0 |
             return getLoader().getCacheSize();
166 |  |
         }
167 |  |
     }