Timing Java method calls.

TimingLambda.java

// This allows you to call methods wrapped in a timer for profilling. 
// I used in a scenario where my abstract class delegated back to concrete implementations, and wanted to be aware of duration.
// Because timer runs in a lambda, it doesn't require any special treatment to see/manipulate current context/scope.

public abstract class AbstractClass{

  public final loadDependencies(Map<String, Object> map){  
    //here we call some methods, they could be anywhere.
    ChainResultsSummary results = timing("getChainResultsSummary",() -> getChainResultsSummary(map));
    ImmutableChain chain = timing("getImmutableChain",() -> getImmutableChain(map));
    List<DeploymentProject> relatedDeployProjects = timing("relatedDeploymentProjects",() -> getRelatedDeploymentProjects(map));
    List<DeploymentProjectStatusForResultSummary> relatedDeployResults = timing("relatedDeployResults",() -> getRelatedDeploymentResults(map));
  }

  public <R> R timing(String name,Supplier<R> operation) {
      long start = System.nanoTime();
      R result  = operation.get();
      if(log.isTraceEnabled()){
          log.trace( String.format("Execution of %s took %dms\n",name, TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - start)));
      }
      return result;
  }
    
}