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Micro-benchmarks to test the performance of core Mule functionality
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/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.el.mvel;

import static org.mule.runtime.core.api.config.MuleProperties.OBJECT_EXPRESSION_LANGUAGE;
import static org.mule.runtime.core.api.lifecycle.LifecycleUtils.stopIfNeeded;
import static org.mule.runtime.core.privileged.registry.LegacyRegistryUtils.lookupObject;

import org.mule.AbstractBenchmark;
import org.mule.runtime.api.exception.MuleException;
import org.mule.runtime.api.scheduler.SchedulerService;
import org.mule.runtime.core.api.MuleContext;
import org.mule.runtime.core.api.construct.Flow;
import org.mule.runtime.core.api.event.CoreEvent;
import org.mule.runtime.core.internal.el.mvel.MVELExpressionLanguage;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.TearDown;

import java.util.Random;

public class MVELDeepAssignBenchmark extends AbstractBenchmark {

  final protected String mel = "mel:payload.firstName = 'Tom';"
      + "payload.lastName = 'Fennelly';"
      + "payload.contact.address = 'Male';"
      + "payload.contact.telnum = '4';"
      + "payload.sin = 'Ireland';"
      + "payload;";

  final protected Payload payload = new Payload();

  private MuleContext muleContext;
  private Flow flow;
  private CoreEvent event;

  @Setup
  public void setup() throws MuleException {
    muleContext = createMuleContextWithServices();
    ((MVELExpressionLanguage) lookupObject(muleContext, OBJECT_EXPRESSION_LANGUAGE)).setAutoResolveVariables(false);
    flow = createFlow(muleContext);
    event = createEvent(flow, payload);
  }

  @TearDown
  public void teardown() throws MuleException {
    stopIfNeeded(lookupObject(muleContext, SchedulerService.class));
    muleContext.dispose();
  }

  /**
   * Cold start: - New expression for each iteration - New context (message) for each iteration
   */
  @Benchmark
  public Object mvelColdStart() {
    return muleContext.getExpressionManager().evaluate(mel + new Random().nextInt(), createEvent(flow, payload));
  }

  /**
   * Warm start: - Same expression for each iteration - New context (message) for each iteration
   */
  @Benchmark
  public Object mvelWarmStart() {
    return muleContext.getExpressionManager().evaluate(mel, event);
  }

  /**
   * Hot start: - Same expression for each iteration - Same context (message) for each iteration
   */
  @Benchmark
  public Object mvelHotStart() {
    return muleContext.getExpressionManager().evaluate(mel, event);
  }

  public static class Payload {

    public String firstName;
    public String lastName;
    public Contact contact = new Contact();
    public String sin;
  }

  public static class Contact {

    public String address;
    public String telnum;
  }
}