kafka TransformerSupplierAdapter 源码
kafka TransformerSupplierAdapter 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/TransformerSupplierAdapter.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.kstream.internals;
import java.util.Collections;
import java.util.Set;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.kstream.Transformer;
import org.apache.kafka.streams.kstream.TransformerSupplier;
import org.apache.kafka.streams.processor.ProcessorContext;
import org.apache.kafka.streams.state.StoreBuilder;
public class TransformerSupplierAdapter<KIn, VIn, KOut, VOut> implements TransformerSupplier<KIn, VIn, Iterable<KeyValue<KOut, VOut>>> {
private final TransformerSupplier<KIn, VIn, KeyValue<KOut, VOut>> transformerSupplier;
public TransformerSupplierAdapter(final TransformerSupplier<KIn, VIn, KeyValue<KOut, VOut>> transformerSupplier) {
this.transformerSupplier = transformerSupplier;
}
@Override
public Transformer<KIn, VIn, Iterable<KeyValue<KOut, VOut>>> get() {
return new Transformer<KIn, VIn, Iterable<KeyValue<KOut, VOut>>>() {
private final Transformer<KIn, VIn, KeyValue<KOut, VOut>> transformer = transformerSupplier.get();
@Override
public void init(final ProcessorContext context) {
transformer.init(context);
}
@Override
public Iterable<KeyValue<KOut, VOut>> transform(final KIn key, final VIn value) {
final KeyValue<KOut, VOut> pair = transformer.transform(key, value);
if (pair != null) {
return Collections.singletonList(pair);
}
return Collections.emptyList();
}
@Override
public void close() {
transformer.close();
}
};
}
@Override
public Set<StoreBuilder<?>> stores() {
return transformerSupplier.stores();
}
}
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