kafka SessionStoreBuilder 源码
kafka SessionStoreBuilder 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/SessionStoreBuilder.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.Serde;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.streams.state.SessionBytesStoreSupplier;
import org.apache.kafka.streams.state.SessionStore;
import java.util.Objects;
public class SessionStoreBuilder<K, V> extends AbstractStoreBuilder<K, V, SessionStore<K, V>> {
private final SessionBytesStoreSupplier storeSupplier;
public SessionStoreBuilder(final SessionBytesStoreSupplier storeSupplier,
final Serde<K> keySerde,
final Serde<V> valueSerde,
final Time time) {
super(Objects.requireNonNull(storeSupplier, "storeSupplier cannot be null").name(), keySerde, valueSerde, time);
Objects.requireNonNull(storeSupplier.metricsScope(), "storeSupplier's metricsScope can't be null");
this.storeSupplier = storeSupplier;
}
@Override
public SessionStore<K, V> build() {
return new MeteredSessionStore<>(
maybeWrapCaching(maybeWrapLogging(storeSupplier.get())),
storeSupplier.metricsScope(),
keySerde,
valueSerde,
time);
}
private SessionStore<Bytes, byte[]> maybeWrapCaching(final SessionStore<Bytes, byte[]> inner) {
if (!enableCaching) {
return inner;
}
return new CachingSessionStore(inner, storeSupplier.segmentIntervalMs());
}
private SessionStore<Bytes, byte[]> maybeWrapLogging(final SessionStore<Bytes, byte[]> inner) {
if (!enableLogging) {
return inner;
}
return new ChangeLoggingSessionBytesStore(inner);
}
public long retentionPeriod() {
return storeSupplier.retentionPeriod();
}
}
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