kafka ReadOnlyKeyValueStoreFacade 源码
kafka ReadOnlyKeyValueStoreFacade 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/ReadOnlyKeyValueStoreFacade.java
/*
* 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.state.internals;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.streams.state.KeyValueIterator;
import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
import org.apache.kafka.streams.state.TimestampedKeyValueStore;
import static org.apache.kafka.streams.state.ValueAndTimestamp.getValueOrNull;
public class ReadOnlyKeyValueStoreFacade<K, V> implements ReadOnlyKeyValueStore<K, V> {
protected final TimestampedKeyValueStore<K, V> inner;
protected ReadOnlyKeyValueStoreFacade(final TimestampedKeyValueStore<K, V> store) {
inner = store;
}
@Override
public V get(final K key) {
return getValueOrNull(inner.get(key));
}
@Override
public KeyValueIterator<K, V> range(final K from,
final K to) {
return new KeyValueIteratorFacade<>(inner.range(from, to));
}
@Override
public KeyValueIterator<K, V> reverseRange(final K from,
final K to) {
return new KeyValueIteratorFacade<>(inner.reverseRange(from, to));
}
@Override
public <PS extends Serializer<P>, P> KeyValueIterator<K, V> prefixScan(final P prefix,
final PS prefixKeySerializer) {
return new KeyValueIteratorFacade<>(inner.prefixScan(prefix, prefixKeySerializer));
}
@Override
public KeyValueIterator<K, V> all() {
return new KeyValueIteratorFacade<>(inner.all());
}
@Override
public KeyValueIterator<K, V> reverseAll() {
return new KeyValueIteratorFacade<>(inner.reverseAll());
}
@Override
public long approximateNumEntries() {
return inner.approximateNumEntries();
}
}
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