MethodCallImplementationConstructor


1   // Copyright 2007 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.hivemind.annotations.internal;
16  
17  import java.lang.reflect.Method  ;
18  
19  import org.apache.hivemind.ApplicationRuntimeException;
20  import org.apache.hivemind.Location;
21  import org.apache.hivemind.annotations.definition.Service;
22  import org.apache.hivemind.definition.ImplementationConstructionContext;
23  import org.apache.hivemind.definition.ImplementationConstructor;
24  import org.apache.hivemind.internal.AbstractServiceImplementationConstructor;
25  
26  /**
27   * Constructs a service implementation by calling a factory method defined in 
28   * an annotated module by use of the {@link Service} annotation. 
29   * 
30   * @author Achim Huegen
31   */
32  public class MethodCallImplementationConstructor extends AbstractServiceImplementationConstructor implements
33          ImplementationConstructor
34  {
35      private Method   _factoryMethod;
36  
37      private ModuleInstanceProvider _moduleInstanceProvider;
38  
39      public MethodCallImplementationConstructor(Location location, Method   factoryMethod,
40              ModuleInstanceProvider moduleInstanceProvider)
41      {
42          super(location);
43          _factoryMethod = factoryMethod;
44          _moduleInstanceProvider = moduleInstanceProvider;
45      }
46  
47      public Object   constructCoreServiceImplementation(ImplementationConstructionContext context)
48      {
49          try
50          {
51              Object   result = _factoryMethod.invoke(_moduleInstanceProvider.getModuleInstance(), (Object  []) null);
52              return result;
53          }
54          catch (Exception   ex)
55          {
56              throw new ApplicationRuntimeException(ex.getMessage(), getLocation(), ex);
57          }
58      }
59  
60  }
61
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