kafka MirrorHeartbeatTask 源码
kafka MirrorHeartbeatTask 代码
文件路径：/connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorHeartbeatTask.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.connect.mirror;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.kafka.connect.source.SourceTask;
import org.apache.kafka.connect.source.SourceRecord;
import org.apache.kafka.connect.data.Schema;
import java.util.Map;
import java.util.List;
import java.util.Collections;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.time.Duration;
/** Emits heartbeats. */
public class MirrorHeartbeatTask extends SourceTask {
private String sourceClusterAlias;
private String targetClusterAlias;
private String heartbeatsTopic;
private Duration interval;
private CountDownLatch stopped;
@Override
public void start(Map<String, String> props) {
stopped = new CountDownLatch(1);
MirrorTaskConfig config = new MirrorTaskConfig(props);
sourceClusterAlias = config.sourceClusterAlias();
targetClusterAlias = config.targetClusterAlias();
heartbeatsTopic = config.heartbeatsTopic();
interval = config.emitHeartbeatsInterval();
}
@Override
public void commit() {
// nop
}
@Override
public void stop() {
stopped.countDown();
}
@Override
public String version() {
return new MirrorHeartbeatConnector().version();
}
@Override
public List<SourceRecord> poll() throws InterruptedException {
// pause to throttle, unless we've stopped
if (stopped.await(interval.toMillis(), TimeUnit.MILLISECONDS)) {
// SourceWorkerTask expects non-zero batches or null
return null;
}
long timestamp = System.currentTimeMillis();
Heartbeat heartbeat = new Heartbeat(sourceClusterAlias, targetClusterAlias, timestamp);
SourceRecord record = new SourceRecord(
heartbeat.connectPartition(), MirrorUtils.wrapOffset(0),
heartbeatsTopic, 0,
Schema.BYTES_SCHEMA, heartbeat.recordKey(),
Schema.BYTES_SCHEMA, heartbeat.recordValue(),
timestamp);
return Collections.singletonList(record);
}
@Override
public void commitRecord(SourceRecord record, RecordMetadata metadata) {
}
}
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kafka DefaultConfigPropertyFilter 源码
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