kafka StateManager 源码
kafka StateManager 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/internals/StateManager.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.common.TopicPartition;
import org.apache.kafka.streams.errors.StreamsException;
import org.apache.kafka.streams.processor.CommitCallback;
import org.apache.kafka.streams.processor.StateRestoreCallback;
import org.apache.kafka.streams.processor.StateStore;
import java.io.File;
import java.io.IOException;
import java.util.Map;
import org.apache.kafka.streams.processor.internals.Task.TaskType;
public interface StateManager {
File baseDir();
/**
* @throws IllegalArgumentException if the store name has already been registered or if it is not a valid name
* (e.g., when it conflicts with the names of internal topics, like the checkpoint file name)
* @throws StreamsException if the store's change log does not contain the partition
*/
void registerStore(final StateStore store,
final StateRestoreCallback stateRestoreCallback,
final CommitCallback checkpoint);
StateStore getStore(final String name);
void flush();
void updateChangelogOffsets(final Map<TopicPartition, Long> writtenOffsets);
void checkpoint();
Map<TopicPartition, Long> changelogOffsets();
void close() throws IOException;
TaskType taskType();
String changelogFor(final String storeName);
// TODO: we can remove this when consolidating global state manager into processor state manager
StateStore getGlobalStore(final String name);
}
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