kafka StateRestoreCallbackAdapter 源码
kafka StateRestoreCallbackAdapter 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/internals/StateRestoreCallbackAdapter.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.processor.internals;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.processor.BatchingStateRestoreCallback;
import org.apache.kafka.streams.processor.StateRestoreCallback;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
public final class StateRestoreCallbackAdapter {
private StateRestoreCallbackAdapter() {}
public static RecordBatchingStateRestoreCallback adapt(final StateRestoreCallback restoreCallback) {
Objects.requireNonNull(restoreCallback, "stateRestoreCallback must not be null");
if (restoreCallback instanceof RecordBatchingStateRestoreCallback) {
return (RecordBatchingStateRestoreCallback) restoreCallback;
} else if (restoreCallback instanceof BatchingStateRestoreCallback) {
return records -> {
final List<KeyValue<byte[], byte[]>> keyValues = new ArrayList<>();
for (final ConsumerRecord<byte[], byte[]> record : records) {
keyValues.add(new KeyValue<>(record.key(), record.value()));
}
((BatchingStateRestoreCallback) restoreCallback).restoreAll(keyValues);
};
} else {
return records -> {
for (final ConsumerRecord<byte[], byte[]> record : records) {
restoreCallback.restore(record.key(), record.value());
}
};
}
}
}
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