kafka LRUCacheEntry 源码

2022-10-20
浏览 (226)

kafka LRUCacheEntry 代码

文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/LRUCacheEntry.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.state.internals;

import org.apache.kafka.common.header.Headers;
import org.apache.kafka.common.header.internals.RecordHeaders;
import org.apache.kafka.streams.processor.internals.ProcessorRecordContext;

import java.util.Objects;

/**
 * A cache entry
 */
class LRUCacheEntry {
    private final ContextualRecord record;
    private final long sizeBytes;
    private boolean isDirty;


    LRUCacheEntry(final byte[] value) {
        this(value, new RecordHeaders(), false, -1, -1, -1, "");
    }

    LRUCacheEntry(final byte[] value,
                  final Headers headers,
                  final boolean isDirty,
                  final long offset,
                  final long timestamp,
                  final int partition,
                  final String topic) {
        final ProcessorRecordContext context = new ProcessorRecordContext(timestamp, offset, partition, topic, headers);

        this.record = new ContextualRecord(
            value,
            context
        );

        this.isDirty = isDirty;
        this.sizeBytes = 1 + // isDirty
            record.residentMemorySizeEstimate();
    }

    void markClean() {
        isDirty = false;
    }

    boolean isDirty() {
        return isDirty;
    }

    long size() {
        return sizeBytes;
    }

    byte[] value() {
        return record.value();
    }

    public ProcessorRecordContext context() {
        return record.recordContext();
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        final LRUCacheEntry that = (LRUCacheEntry) o;
        return sizeBytes == that.sizeBytes &&
            isDirty() == that.isDirty() &&
            Objects.equals(record, that.record);
    }

    @Override
    public int hashCode() {
        return Objects.hash(record, sizeBytes, isDirty());
    }
}

相关信息

kafka 源码目录

相关文章

kafka AbstractDualSchemaRocksDBSegmentedBytesStore 源码

kafka AbstractMergedSortedCacheStoreIterator 源码

kafka AbstractRocksDBSegmentedBytesStore 源码

kafka AbstractRocksDBTimeOrderedSegmentedBytesStore 源码

kafka AbstractSegments 源码

kafka AbstractStoreBuilder 源码

kafka BatchWritingStore 源码

kafka BlockBasedTableConfigWithAccessibleCache 源码

kafka BufferKey 源码

kafka BufferValue 源码

0 赞

所属分类： 大数据
本文标签： 大数据
版权声明： 原创文章如转载，请注明本文链接: https://m.seaxiang.com/blog/a2438d3e9b014417b5424e76ca97bd68

热门推荐

1、直接访问google.com
2、 - 优质文章
3、 gate.io
4、 harmony 鸿蒙hdc使用指导
5、 harmony 鸿蒙ArkUI组件（ArkTS）开发常见问题
6、 harmony 鸿蒙初识ArkTS语言
7、 golang
8、 flink kafka connector scan.startup.mode 的几个选项
9、 openharmony
10、 Vue中input框自动聚焦

Loading...