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NettyQueuesGaugeBuilder.java
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NettyQueuesGaugeBuilder.java
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package com.outbrain.ob1k.common.metrics;
import com.outbrain.swinfra.metrics.api.Gauge;
import com.outbrain.swinfra.metrics.api.MetricFactory;
import io.netty.channel.EventLoopGroup;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.SingleThreadEventExecutor;
/**
* register a gauge on the queue size of every event loop belonging to the group.
*/
public class NettyQueuesGaugeBuilder {
public static void registerQueueGauges(final MetricFactory factory, final EventLoopGroup elg, final String componentName) {
if (factory == null || elg == null) {
return;
}
int index = 0;
for (final EventExecutor eventExecutor : elg) {
if (eventExecutor instanceof SingleThreadEventExecutor) {
final SingleThreadEventExecutor singleExecutor = (SingleThreadEventExecutor) eventExecutor;
factory.registerGauge("EventLoopGroup-" + componentName, "EventLoop-" + index, new Gauge<Integer>() {
@Override
public Integer getValue() {
return singleExecutor.pendingTasks();
}
});
index++;
}
}
}
}