org.apache.kafka.streams.kstream.internals.KTableValueGetter Maven / Gradle / Ivy
/*
* 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.kafka.streams.kstream.internals;
import org.apache.kafka.streams.processor.api.ProcessorContext;
import org.apache.kafka.streams.state.ValueAndTimestamp;
public interface KTableValueGetter {
void init(ProcessorContext, ?> context);
ValueAndTimestamp get(K key);
/**
* Returns the latest record version, associated with the provided key, with timestamp
* not exceeding the provided timestamp bound. This method may only be called if
* {@link #isVersioned()} is true.
*/
default ValueAndTimestamp get(K key, long asOfTimestamp) {
throw new UnsupportedOperationException("get(key, timestamp) is only supported for versioned stores");
}
/**
* @return whether this value getter supports multiple record versions for the same key.
* If true, then {@link #get(Object, long)} must be implemented. If not, then
* {@link #get(Object, long)} must not be called.
*/
boolean isVersioned();
default void close() {}
}