Javers将字段与注释进行比较

Question

我有一个Java8/Maven/Spring Boot项目。我使用Javers来审核应用程序中的更改，然而，我创建了一个自定义注释，它放在类中的字段上方，如果更改，我希望对其进行审核。下面是一个示例类：

public class Foo {
  @AuditThis
  private final String someString;
  private final int someInt;
  @AuditThis
  private final double someDouble;
  private final long someLong;
  @AuditThis
  private final List<String> someList;
}

public class AuditThisComparator implements CustomPropertyComparator<Object, ValueChange> {
   @Override
   public ValueChange compare(final Object left,
                              final Object right,
                              final GlobalId globalId,
                              final Property property) {
       ValueChange change = null;

       Field[] leftFields = left.getClass().getDeclaredFields();
       Field[] rightFields = right.getClass().getDeclaredFields();

       int upperBound = leftFields.length;
       for (int i = 0; i < upperBound; i++) {
           if (return i < leftFields.length && leftFields[i].getAnnotation(AuditThis.class) != null) {
               change = new ValueChange(globalId, property.getName(), left, right);
               break;
           }
       }

       return change;
   }
}

Javers javers = JaversBuilder.javers()
                             .registerCustomComparator(new AuditThisComparator(), Object.class)
                             .build();

Answer 1

JaVers为此设计了@diffinclude属性。参见https://javers.org/documentation/domain-configuration/#property-level-annotations

把它放在你想要审计的字段上，其他的字段会被沙弗斯忽略。这是正确的方法，你不能注册你的注释。编写自定义比较器似乎是个坏主意，因为您必须复制JaVers diff算法。