spark SparkDataStream 源码
spark SparkDataStream 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/streaming/SparkDataStream.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.spark.sql.connector.read.streaming;
import org.apache.spark.annotation.Evolving;
/**
* The base interface representing a readable data stream in a Spark streaming query. It's
* responsible to manage the offsets of the streaming source in the streaming query.
* <p>
* Data sources should implement concrete data stream interfaces:
* {@link MicroBatchStream} and {@link ContinuousStream}.
*
* @since 3.0.0
*/
@Evolving
public interface SparkDataStream {
/**
* Returns the initial offset for a streaming query to start reading from. Note that the
* streaming data source should not assume that it will start reading from its initial offset:
* if Spark is restarting an existing query, it will restart from the check-pointed offset rather
* than the initial one.
*/
Offset initialOffset();
/**
* Deserialize a JSON string into an Offset of the implementation-defined offset type.
*
* @throws IllegalArgumentException if the JSON does not encode a valid offset for this reader
*/
Offset deserializeOffset(String json);
/**
* Informs the source that Spark has completed processing all data for offsets less than or
* equal to `end` and will only request offsets greater than `end` in the future.
*/
void commit(Offset end);
/**
* Stop this source and free any resources it has allocated.
*/
void stop();
}
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