spring-data-elasticsearch ScrollState 源码
spring-data-elasticsearch ScrollState 代码
文件路径：/src/main/java/org/springframework/data/elasticsearch/client/util/ScrollState.java
/*
* Copyright 2020-2022 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.data.elasticsearch.client.util;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.springframework.lang.Nullable;
import org.springframework.util.StringUtils;
/**
* Mutable state object holding scrollId to be used for scroll requests.
*
* @author Christoph Strobl
* @author Peter-Josef Meisch
* @since 3.2
*/
public class ScrollState {
private final Object lock = new Object();
private final Set<String> pastIds = new LinkedHashSet<>();
@Nullable private String scrollId;
public ScrollState() {}
public ScrollState(String scrollId) {
updateScrollId(scrollId);
}
@Nullable
public String getScrollId() {
return scrollId;
}
public List<String> getScrollIds() {
synchronized (lock) {
return List.copyOf(pastIds);
}
}
public void updateScrollId(@Nullable String scrollId) {
if (StringUtils.hasText(scrollId)) {
synchronized (lock) {
this.scrollId = scrollId;
pastIds.add(scrollId);
}
}
}
}
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