CyclicDependencyGuard


1   /*
2    * Copyright (C) 2004 Joerg Schaible
3    * Created on 07.09.2004 by joehni
4    */
5   package org.picocontainer.defaults;
6   
7   /**
8    * TODO Auto-generated JavaDoc
9    * 
10   * @author joehni
11   * @since 1.1
12   */
13  public interface CyclicDependencyGuard {
14  
15      /**
16       * Derive from this class and implement this function with the functionality 
17       * to observe for a dependency cycle.
18       * 
19       * @return a value, if the functionality result in an expression, 
20       *      otherwise just return <code>null</code>
21       */
22      public Object   run();
23      
24      /**
25       * Call the observing function. The provided guard will hold the {@link Boolean} value.
26       * If the guard is already <code>Boolean.TRUE</code> a {@link CyclicDependencyException} 
27       * will be  thrown.
28       * 
29       * @param stackFrame the current stack frame
30       * @return the result of the <code>run</code> method
31       */
32      public Object   observe(Class   stackFrame);
33  }

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