org.apache.spark.sql.execution.streaming.Offset Maven / Gradle / Ivy
/*
* 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.execution.streaming;
/**
* This is an internal, deprecated interface. New source implementations should use the
* org.apache.spark.sql.sources.v2.reader.Offset class, which is the one that will be supported
* in the long term.
*
* This class will be removed in a future release.
*/
public abstract class Offset {
/**
* A JSON-serialized representation of an Offset that is
* used for saving offsets to the offset log.
* Note: We assume that equivalent/equal offsets serialize to
* identical JSON strings.
*
* @return JSON string encoding
*/
public abstract String json();
/**
* Equality based on JSON string representation. We leverage the
* JSON representation for normalization between the Offset's
* in memory and on disk representations.
*/
@Override
public boolean equals(Object obj) {
if (obj instanceof Offset) {
return this.json().equals(((Offset) obj).json());
} else {
return false;
}
}
@Override
public int hashCode() {
return this.json().hashCode();
}
@Override
public String toString() {
return this.json();
}
}