/*
* 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 gobblin.runtime.api;
public interface SpecCatalogListenersContainer {
/**
* Adds a {@link SpecCatalogListener} that will be invoked upon updates on the
* {@link SpecCatalog}. Upon registration {@link SpecCatalogListener#onAddSpec(Spec)} will be
* invoked for all pre-existing specs in the SpecCatalog.
*/
void addListener(SpecCatalogListener specListener);
/**
* Like {@link #addListener(SpecCatalogListener)} but it will create a weak reference. The
* implementation will automatically remove the listener registration once the listener object
* gets GCed.
*
* <p>Note that weak listeners cannot be removed using {@link #removeListener(SpecCatalogListener)}.
*/
void registerWeakSpecCatalogListener(SpecCatalogListener specCatalogListener);
/**
* Removes the specified listener. No-op if not registered.
*/
void removeListener(SpecCatalogListener specCatalogListener);
}