Annotation Interface RequiresInstanceClassLoading
@Documented
@Target(TYPE)
@Retention(RUNTIME)
@Inherited
public @interface RequiresInstanceClassLoading
Marker annotation a component can use to indicate that the framework should create a new ClassLoader
for each instance of the component, copying all resources from the component's NARClassLoader to a
new ClassLoader which will only be used by a given instance of the component.
If cloneAncestorResources is set to true, the instance ClassLoader will include ancestor resources up to the
first ClassLoader containing a controller service API referenced by the component, or up to the Jetty NAR.
Example #1 - PutHDFS has this flag set to true and does not reference any controller services, so it will include
resources from nifi-hadoop-nar, nifi-hadoop-libraries-nar, and nifi-standard-services-api-nar, stopping at nifi-jetty-nar.
Example #2 - If PutHDFS referenced an SSLContext and has this flag set to true, then it would include
resources from nifi-hadoop-nar, nifi-hadoop-libraries-nar, and stop before nifi-standard-services-api-nar.
Example #3 - HBaseClientService_1_1_2 does not have this flag set so it defaults to false, and therefore includes
only resources from the nifi-hbase-client-service-1_1_2-nar.
NOTE: When this annotation is used it is important to note that each added instance of the component will increase
the overall memory footprint more than that of a component without this annotation.
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Optional Element Summary
Optional Elements
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Element Details
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cloneAncestorResources
boolean cloneAncestorResources- Default:
false
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