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CatalogModificationListener.java
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CatalogModificationListener.java
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/*
* 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.flink.table.catalog.listener;
import org.apache.flink.annotation.PublicEvolving;
/**
* A listener that is notified on specific catalog changed in catalog manager.
*
* <p>It is highly recommended NOT to perform any blocking operation inside the callbacks. If you
* block the thread the invoker of catalog manager is possibly blocked. You can perform the
* operation asynchronously in an executor, but you need to handle timing issues.
*/
@PublicEvolving
public interface CatalogModificationListener {
/** Callback on catalog modification such as database and table ddl operations. */
void onEvent(CatalogModificationEvent event);
}