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Chapter 15. Custom Interceptors

Important

Custom interceptors are deprecated in Data Grid and will be removed in a future version.

Custom interceptors are a way of extending Data Grid by being able to influence or respond to any modifications to cache. Example of such modifications are: elements are added/removed/updated or transactions are committed.

15.1. Adding custom interceptors declaratively
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Custom interceptors can be added on a per named cache basis. This is because each named cache have its own interceptor stack. Following xml snippet depicts the ways in which a custom interceptor can be added. 

<local-cache name="cacheWithCustomInterceptors">
  <!-- Define custom interceptors. -->
  <!-- Custom interceptors should extend
       org.infinispan.interceptors.BaseCustomAsyncInterceptor -->
  <custom-interceptors>
    <interceptor position="FIRST" class="com.mycompany.CustomInterceptor1">
      <property name="attributeOne">value1</property>
      <property name="attributeTwo">value2</property>
    </interceptor>
    <interceptor position="LAST" class="com.mycompany.CustomInterceptor2"/>
    <interceptor index="3" class="com.mycompany.CustomInterceptor1"/>
    <interceptor before="org.infinispanpan.interceptors.CallInterceptor"
                 class="com.mycompany.CustomInterceptor2"/>
    <interceptor after="org.infinispanpan.interceptors.CallInterceptor"
                 class="com.mycompany.CustomInterceptor1"/>
  </custom-interceptors>
</local-cache>
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15.2. Adding custom interceptors programmatically
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In order to do that one needs to obtain a reference to the AdvancedCache. This can be done as follows: 

CacheManager cm = getCacheManager();//magic
Cache aCache = cm.getCache("aName");
AdvancedCache advCache = aCache.getAdvancedCache();
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Then one of the addInterceptor() methods should be used to add the actual interceptor. For further documentation refer to AdvancedCache javadoc.

15.3. Custom interceptor design
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When writing a custom interceptor, you need to abide by the following rules.

  • Custom interceptors must declare a public, empty constructor to enable construction.
  • Custom interceptors will have setters for any property defined through property tags used in the XML configuration.
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