Github user kevdoran commented on a diff in the pull request: https://github.com/apache/nifi-registry/pull/133#discussion_r208955153 --- Diff: nifi-registry-framework/src/main/java/org/apache/nifi/registry/provider/hook/AbstractHookProvider.java --- @@ -0,0 +1,70 @@ +/* + * 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.registry.provider.hook; + +import org.apache.nifi.registry.hook.Event; +import org.apache.nifi.registry.hook.EventHookException; +import org.apache.nifi.registry.hook.EventHookProvider; +import org.apache.nifi.registry.hook.EventType; +import org.apache.nifi.registry.provider.ProviderConfigurationContext; +import org.apache.nifi.registry.provider.ProviderCreationException; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import org.springframework.util.CollectionUtils; + +import java.util.List; + +/** + * An AbstractHookProvider class that serves as a place to keep common Event Hook implementation details. + */ +public abstract class AbstractHookProvider + implements EventHookProvider { + + static final Logger LOGGER = LoggerFactory.getLogger(AbstractHookProvider.class); + + static final String EVENT_WHITELIST = "Event Whitelist"; + protected List<EventType> whiteListEvents = null; + + @Override + public void handle(Event event) throws EventHookException { + // Abstract event handling logic can be implemented here. + } + + @Override + public void onConfigured(ProviderConfigurationContext configurationContext) throws ProviderCreationException { + + } --- End diff -- This is an abstract class so we don't need the empty interface methods for `handle(...)` and `onConfigured(...)`
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