spark Write 源码
spark Write 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/write/Write.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.write;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.connector.catalog.Table;
import org.apache.spark.sql.connector.catalog.TableCapability;
import org.apache.spark.sql.connector.metric.CustomMetric;
import org.apache.spark.sql.connector.write.streaming.StreamingWrite;
/**
* A logical representation of a data source write.
* <p>
* This logical representation is shared between batch and streaming write. Data sources must
* implement the corresponding methods in this interface to match what the table promises
* to support. For example, {@link #toBatch()} must be implemented if the {@link Table} that
* creates this {@link Write} returns {@link TableCapability#BATCH_WRITE} support in its
* {@link Table#capabilities()}.
*
* @since 3.2.0
*/
@Evolving
public interface Write {
/**
* Returns the description associated with this write.
*/
default String description() {
return this.getClass().toString();
}
/**
* Returns a {@link BatchWrite} to write data to batch source. By default this method throws
* exception, data sources must overwrite this method to provide an implementation, if the
* {@link Table} that creates this write returns {@link TableCapability#BATCH_WRITE} support in
* its {@link Table#capabilities()}.
*/
default BatchWrite toBatch() {
throw new UnsupportedOperationException(description() + ": Batch write is not supported");
}
/**
* Returns a {@link StreamingWrite} to write data to streaming source. By default this method
* throws exception, data sources must overwrite this method to provide an implementation, if the
* {@link Table} that creates this write returns {@link TableCapability#STREAMING_WRITE} support
* in its {@link Table#capabilities()}.
*/
default StreamingWrite toStreaming() {
throw new UnsupportedOperationException(description() + ": Streaming write is not supported");
}
/**
* Returns an array of supported custom metrics with name and description.
* By default it returns empty array.
*/
default CustomMetric[] supportedCustomMetrics() {
return new CustomMetric[]{};
}
}
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