markap14 commented on a change in pull request #5533: URL: https://github.com/apache/nifi/pull/5533#discussion_r752536616
########## File path: nifi-api/src/main/java/org/apache/nifi/components/ClassloaderIsolationKey.java ########## @@ -0,0 +1,60 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.nifi.components; + +import org.apache.nifi.context.PropertyContext; + +/** + * <p> + * There are times when a component must be created in such a way that each instance gets its own ClassLoader hierarchy, + * rather than sharing the ClassLoader with other components (see {@link org.apache.nifi.annotation.behavior.RequiresInstanceClassLoading @RequiresInstanceClassLoading}). + * This, however, can be extremely expensive, as all of the classes must be loaded again for each instance of the component. When thousands of these + * components are used in a single flow, the startup time can be great, and it can lead to massive amounts of RAM being required. + * </p> + * + * <p> + * For components that do require instance ClassLoading that clones ancestor resources, this interface can be optional implemented by the component. + * If the interface is implemented, the component is given the opportunity to return a distinct "key" that can be used to identify instances that may share + * the same ClassLoader. + * </p> + */ +public interface ClassloaderIsolationKey { Review comment: Fair enough. Will rename to `ClassloaderIsolationKeyProvider` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
