content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package io.activej.http;
  
  import io.activej.common.Checks;
  import io.activej.jmx.api.attribute.JmxAttribute;
  import io.activej.promise.Promise;
  import io.activej.promise.jmx.PromiseStats;
  import io.activej.reactor.AbstractReactive;
  import io.activej.reactor.Reactor;
  import io.activej.reactor.jmx.ReactiveJmxBeanWithStats;
  
  import java.time.Duration;
  
  import static io.activej.reactor.Reactive.checkInReactorThread;
  
  public abstract class ServletWithStats extends AbstractReactive
  	implements AsyncServlet, ReactiveJmxBeanWithStats {
  	private static final boolean CHECKS = Checks.isEnabled(ServletWithStats.class);
  
  	private final PromiseStats stats = PromiseStats.create(Duration.ofMinutes(5));
  
  	protected ServletWithStats(Reactor reactor) {
  		super(reactor);
  	}
  
  	protected abstract Promise<HttpResponse> doServe(HttpRequest request);
  
  	@Override
  	public final Promise<HttpResponse> serve(HttpRequest request) {
  		if (CHECKS) checkInReactorThread(this);
  		return doServe(request)
  			.whenComplete(stats.recordStats());
  	}
  
  	@JmxAttribute
  	public PromiseStats getStats() {
  		return stats;
  	}
  
  	public void setStatsHistogramLevels(long[] levels) {
  		stats.setHistogram(levels);
  	}
  
  }
  