spark ReadLimit 源码
spark ReadLimit 代码
文件路径:/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/streaming/ReadLimit.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;
/**
* Interface representing limits on how much to read from a {@link MicroBatchStream} when it
* implements {@link SupportsAdmissionControl}. There are several child interfaces representing
* various kinds of limits.
*
* @see SupportsAdmissionControl#latestOffset(Offset, ReadLimit)
* @see ReadAllAvailable
* @see ReadMaxRows
* @since 3.0.0
*/
@Evolving
public interface ReadLimit {
static ReadLimit minRows(long rows, long maxTriggerDelayMs) {
return new ReadMinRows(rows, maxTriggerDelayMs);
}
static ReadLimit maxRows(long rows) { return new ReadMaxRows(rows); }
static ReadLimit maxFiles(int files) { return new ReadMaxFiles(files); }
static ReadLimit allAvailable() { return ReadAllAvailable.INSTANCE; }
static ReadLimit compositeLimit(ReadLimit[] readLimits) {
return new CompositeReadLimit(readLimits);
}
}
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