com.wavefront.agent.preprocessor.PreprocessorRuleMetrics Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of proxy Show documentation

Service for batching and relaying metric traffic to Wavefront

There is a newer version: 13.4

package com.wavefront.agent.preprocessor;

import com.yammer.metrics.core.Counter;
import javax.annotation.Nullable;

/**
 * A helper class for instrumenting preprocessor rules. Tracks two counters: number of times the
 * rule has been successfully applied, and counter of CPU time (nanos) spent on applying the rule to
 * troubleshoot possible performance issues.
 *
 * @author [email protected]
 */
public class PreprocessorRuleMetrics {
  @Nullable private final Counter ruleAppliedCounter;
  @Nullable private final Counter ruleCpuTimeNanosCounter;
  @Nullable private final Counter ruleCheckedCounter;

  public PreprocessorRuleMetrics(
      @Nullable Counter ruleAppliedCounter,
      @Nullable Counter ruleCpuTimeNanosCounter,
      @Nullable Counter ruleCheckedCounter) {
    this.ruleAppliedCounter = ruleAppliedCounter;
    this.ruleCpuTimeNanosCounter = ruleCpuTimeNanosCounter;
    this.ruleCheckedCounter = ruleCheckedCounter;
  }

  /** Increment ruleAppliedCounter (if available) by 1 */
  public void incrementRuleAppliedCounter() {
    if (this.ruleAppliedCounter != null) {
      this.ruleAppliedCounter.inc();
    }
  }

  /**
   * Measure rule execution time and add it to ruleCpuTimeNanosCounter (if available)
   *
   * @param ruleStartTime rule start time
   */
  public void ruleEnd(long ruleStartTime) {
    if (this.ruleCpuTimeNanosCounter != null) {
      this.ruleCpuTimeNanosCounter.inc(System.nanoTime() - ruleStartTime);
    }
  }

  /**
   * Mark rule start time, increment ruleCheckedCounter (if available) by 1
   *
   * @return start time in nanos
   */
  public long ruleStart() {
    if (this.ruleCheckedCounter != null) {
      this.ruleCheckedCounter.inc();
    }
    return System.nanoTime();
  }
}