kafka AbstractQueryResult 源码
kafka AbstractQueryResult 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/query/internals/AbstractQueryResult.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.streams.query.internals;
import org.apache.kafka.streams.query.Position;
import org.apache.kafka.streams.query.PositionBound;
import org.apache.kafka.streams.query.QueryResult;
import org.apache.kafka.streams.query.StateQueryRequest;
import java.util.LinkedList;
import java.util.List;
/**
* Container for a single partition's result when executing a {@link StateQueryRequest}.
*
* @param <R> The result type of the query.
*/
public abstract class AbstractQueryResult<R> implements QueryResult<R> {
private List<String> executionInfo = new LinkedList<>();
private Position position;
public AbstractQueryResult() {
}
public AbstractQueryResult(final List<String> executionInfo, final Position position) {
this.executionInfo = executionInfo;
this.position = position;
}
/**
* Used by stores to add detailed execution information (if requested) during query execution.
*/
public void addExecutionInfo(final String message) {
executionInfo.add(message);
}
/**
* Used by stores to report what exact position in the store's history it was at when it
* executed the query.
*/
public void setPosition(final Position position) {
this.position = position;
}
/**
* If detailed execution information was requested in {@link StateQueryRequest#enableExecutionInfo()},
* this method returned the execution details for this partition's result.
*/
public List<String> getExecutionInfo() {
return executionInfo;
}
/**
* This state partition's exact position in its history when this query was executed. Can be
* used in conjunction with subsequent queries via {@link StateQueryRequest#withPositionBound(PositionBound)}.
* <p>
* Note: stores are encouraged, but not required to set this property.
*/
public Position getPosition() {
return position;
}
}
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