kafka OffsetBackingStore 源码
kafka OffsetBackingStore 代码
文件路径：/connect/runtime/src/main/java/org/apache/kafka/connect/storage/OffsetBackingStore.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.connect.storage;
import org.apache.kafka.connect.runtime.WorkerConfig;
import org.apache.kafka.connect.util.Callback;
import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.Map;
import java.util.concurrent.Future;
/**
* <p>
* OffsetBackingStore is an interface for storage backends that store key-value data. The backing
* store doesn't need to handle serialization or deserialization. It only needs to support
* reading/writing bytes. Since it is expected these operations will require network
* operations, only bulk operations are supported.
* </p>
* <p>
* Since OffsetBackingStore is a shared resource that may be used by many OffsetStorage instances
* that are associated with individual tasks, the caller must be sure keys include information about the
* connector so that the shared namespace does not result in conflicting keys.
* </p>
*/
public interface OffsetBackingStore {
/**
* Start this offset store.
*/
void start();
/**
* Stop the backing store. Implementations should attempt to shutdown gracefully, but not block
* indefinitely.
*/
void stop();
/**
* Get the values for the specified keys
* @param keys list of keys to look up
* @return future for the resulting map from key to value
*/
Future<Map<ByteBuffer, ByteBuffer>> get(Collection<ByteBuffer> keys);
/**
* Set the specified keys and values.
* @param values map from key to value
* @param callback callback to invoke on completion
* @return void future for the operation
*/
Future<Void> set(Map<ByteBuffer, ByteBuffer> values, Callback<Void> callback);
/**
* Configure class with the given key-value pairs
* @param config can be DistributedConfig or StandaloneConfig
*/
void configure(WorkerConfig config);
}
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