聊聊BinlogConnectorReplicator的work
StoppableTask
maxwell-1.25.1/src/main/java/com/zendesk/maxwell/util/StoppableTask.java
public interface StoppableTask { void requestStop() throws Exception;
void awaitStop(Long timeout) throws TimeoutException;
}
- StoppableTask接口定义了requestStop、awaitStop方法
RunLoopProcess
maxwell-1.25.1/src/main/java/com/zendesk/maxwell/util/RunLoopProcess.java
abstract public class RunLoopProcess implements StoppableTask { protected volatile StoppableTaskState taskState;
private Thread thread;
public RunLoopProcess() {
this.taskState = new StoppableTaskState(this.getClass().getName());
}
public void requestStop() {
this.taskState.requestStop();
interrupt();
}
public void interrupt() {
if ( this.thread != null )
this.thread.interrupt();
}
public void awaitStop(Long timeout) throws TimeoutException {
this.taskState.awaitStop(thread, timeout);
}
public void runLoop() throws Exception {
this.thread = Thread.currentThread();
this.beforeStart();
try {
while (this.taskState.isRunning()) {
work();
}
} finally {
this.beforeStop();
this.taskState.stopped();
}
}
protected abstract void work() throws Exception;
protected void beforeStart() throws Exception { }
protected void beforeStop() throws Exception { }
}
- RunLoopProcess实现了StoppableTask接口,其runLoop方法会通过while循环不断执行work()方法,直到taskState.isRunning()为false
BinlogConnectorReplicator
maxwell-1.25.1/src/main/java/com/zendesk/maxwell/replication/BinlogConnectorReplicator.java
public class BinlogConnectorReplicator extends RunLoopProcess implements Replicator { //......
public void work() throws Exception {
RowMap row = null;
try {
row = getRow();
} catch ( InterruptedException e ) {
}
if ( row == null )
return;
rowCounter.inc();
rowMeter.mark();
if ( scripting != null && !isMaxwellRow(row))
scripting.invoke(row);
processRow(row);
}
protected void processRow(RowMap row) throws Exception {
if ( row instanceof HeartbeatRowMap) {
producer.push(row);
if (stopAtHeartbeat != null) {
long thisHeartbeat = row.getPosition().getLastHeartbeatRead();
if (thisHeartbeat >= stopAtHeartbeat) {
LOGGER.info("received final heartbeat " + thisHeartbeat + "; stopping replicator");
// terminate runLoop
this.taskState.stopped();
}
}
} else if ( !shouldSkipRow(row) )
producer.push(row);
}
//......
}
- BinlogConnectorReplicator实现了RunLoopProcess接口,其work方法通过getRow()获取RowMap,若不为null则执行processRow(row)方法;processRow方法则执行producer.push(row)
AbstractProducer
maxwell-1.25.1/src/main/java/com/zendesk/maxwell/producer/AbstractProducer.java
public abstract class AbstractProducer { protected final MaxwellContext context;
protected final MaxwellOutputConfig outputConfig;
protected final Counter succeededMessageCount;
protected final Meter succeededMessageMeter;
protected final Counter failedMessageCount;
protected final Meter failedMessageMeter;
protected final Timer messagePublishTimer;
protected final Timer messageLatencyTimer;
protected final Counter messageLatencySloViolationCount;
public AbstractProducer(MaxwellContext context) {
this.context = context;
this.outputConfig = context.getConfig().outputConfig;
Metrics metrics = context.getMetrics();
MetricRegistry metricRegistry = metrics.getRegistry();
this.succeededMessageCount = metricRegistry.counter(metrics.metricName("messages", "succeeded"));
this.succeededMessageMeter = metricRegistry.meter(metrics.metricName("messages", "succeeded", "meter"));
this.failedMessageCount = metricRegistry.counter(metrics.metricName("messages", "failed"));
this.failedMessageMeter = metricRegistry.meter(metrics.metricName("messages", "failed", "meter"));
this.messagePublishTimer = metricRegistry.timer(metrics.metricName("message", "publish", "time"));
this.messageLatencyTimer = metricRegistry.timer(metrics.metricName("message", "publish", "age"));
this.messageLatencySloViolationCount = metricRegistry.counter(metrics.metricName("message", "publish", "age", "slo_violation"));
}
abstract public void push(RowMap r) throws Exception;
public StoppableTask getStoppableTask() {
return null;
}
public Meter getFailedMessageMeter() {
return this.failedMessageMeter;
}
public MaxwellDiagnostic getDiagnostic() {
return null;
}
}
- AbstractProducer定义了push抽象方法供子类实现
StdoutProducer
maxwell-1.25.1/src/main/java/com/zendesk/maxwell/producer/StdoutProducer.java
public class StdoutProducer extends AbstractProducer { public StdoutProducer(MaxwellContext context) {
super(context);
}
@Override
public void push(RowMap r) throws Exception {
String output = r.toJSON(outputConfig);
if ( output != null && r.shouldOutput(outputConfig) )
System.out.println(output);
this.context.setPosition(r);
}
}
- StdoutProducer继承了AbstractProducer,其push方法则执行System.out.println(output)以及context.setPosition(r)
小结
StoppableTask接口定义了requestStop、awaitStop方法;RunLoopProcess实现了StoppableTask接口,其runLoop方法会通过while循环不断执行work()方法,直到taskState.isRunning()为false;BinlogConnectorReplicator实现了RunLoopProcess接口,其work方法通过getRow()获取RowMap,若不为null则执行processRow(row)方法;processRow方法则执行producer.push(row)
doc
- BinlogConnectorReplicator
以上是 聊聊BinlogConnectorReplicator的work 的全部内容, 来源链接: utcz.com/z/516082.html