ServiceInterceptorFactory


1   // Copyright 2004, 2005 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;
16  
17  import org.apache.hivemind.internal.Module;
18  
19  /**
20   * Interface defining an interceptor factory, an object that can create
21   * an interceptor.  Interceptors are objects that implement a particular
22   * interface, adding logic before or after invoking methods on a wrapped
23   * object (implementing the same instance).
24   * 
25   * <p>
26   * Implementations must be stateless and multi-threaded. 
27   * An interceptor may only be applied once to any single service.
28   * The factory will only be invoked once for any single service (even in the case
29   * of non-standard service models such as threaded and pooled).
30   *
31   * @author Howard Lewis Ship
32   */
33  public interface ServiceInterceptorFactory
34  {
35      /**
36        * Creates an interceptor and pushes it onto the interceptor stack.
37        * @param parameters  factory specific parameters. The implementatation class
38        *                    should document which type is expected here. 
39        */
40      public void createInterceptor(InterceptorStack stack, Module invokingModule, Object   parameters);
41  }
42

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