kafka KTableKTableAbstractJoin 源码
kafka KTableKTableAbstractJoin 代码
文件路径:/streams/src/main/java/org/apache/kafka/streams/kstream/internals/KTableKTableAbstractJoin.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 org.apache.kafka.streams.kstream.ValueJoiner;
abstract class KTableKTableAbstractJoin<K, V1, V2, VOut> implements
KTableProcessorSupplier<K, V1, K, VOut> {
private final KTableImpl<K, ?, V1> table1;
private final KTableImpl<K, ?, V2> table2;
final KTableValueGetterSupplier<K, V1> valueGetterSupplier1;
final KTableValueGetterSupplier<K, V2> valueGetterSupplier2;
final ValueJoiner<? super V1, ? super V2, ? extends VOut> joiner;
boolean sendOldValues = false;
KTableKTableAbstractJoin(final KTableImpl<K, ?, V1> table1,
final KTableImpl<K, ?, V2> table2,
final ValueJoiner<? super V1, ? super V2, ? extends VOut> joiner) {
this.table1 = table1;
this.table2 = table2;
this.valueGetterSupplier1 = table1.valueGetterSupplier();
this.valueGetterSupplier2 = table2.valueGetterSupplier();
this.joiner = joiner;
}
@Override
public final boolean enableSendingOldValues(final boolean forceMaterialization) {
// Table-table joins require upstream materialization:
table1.enableSendingOldValues(true);
table2.enableSendingOldValues(true);
sendOldValues = true;
return true;
}
}
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