kafka TimestampedSegments 源码
kafka TimestampedSegments 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/TimestampedSegments.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.streams.processor.ProcessorContext;
import org.apache.kafka.streams.processor.internals.ProcessorContextUtils;
import org.apache.kafka.streams.state.internals.metrics.RocksDBMetricsRecorder;
/**
* Manages the {@link TimestampedSegment}s that are used by the {@link RocksDBTimestampedSegmentedBytesStore}
*/
class TimestampedSegments extends AbstractSegments<TimestampedSegment> {
private final RocksDBMetricsRecorder metricsRecorder;
TimestampedSegments(final String name,
final String metricsScope,
final long retentionPeriod,
final long segmentInterval) {
super(name, retentionPeriod, segmentInterval);
metricsRecorder = new RocksDBMetricsRecorder(metricsScope, name);
}
@Override
public TimestampedSegment getOrCreateSegment(final long segmentId,
final ProcessorContext context) {
if (segments.containsKey(segmentId)) {
return segments.get(segmentId);
} else {
final TimestampedSegment newSegment =
new TimestampedSegment(segmentName(segmentId), name, segmentId, metricsRecorder);
if (segments.put(segmentId, newSegment) != null) {
throw new IllegalStateException("TimestampedSegment already exists. Possible concurrent access.");
}
newSegment.openDB(context.appConfigs(), context.stateDir());
return newSegment;
}
}
@Override
public void openExisting(final ProcessorContext context, final long streamTime) {
metricsRecorder.init(ProcessorContextUtils.getMetricsImpl(context), context.taskId());
super.openExisting(context, streamTime);
}
}
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