/* 
    * 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 org.esigate.server.metrics;
  
  import java.io.IOException;
  
  import org.eclipse.jetty.server.ConnectionFactory;
  import org.eclipse.jetty.server.Server;
  import org.eclipse.jetty.server.ServerConnector;
  import org.eclipse.jetty.util.annotation.Name;
  import org.eclipse.jetty.util.ssl.SslContextFactory;
  
  import com.codahale.metrics.Counter;
  import com.codahale.metrics.Meter;
  import com.codahale.metrics.MetricRegistry;
  
  public class InstrumentedServerConnector extends ServerConnector {
      private Meter accepts, connects, disconnects;
      private Counter connections;
  
      /**
       * Jetty 9 ServerConnector instrumented with Metrics.
       * 
       * @param id
       *            connector id, will be used as prefix for metrics.
       * @param port
       *            this port will be set with ServerConnector#setPort().
       * @param server
       *            Jetty server.
       */
      public InstrumentedServerConnector(String id, int port, @Name("server") Server server, MetricRegistry registry) {
          super(server);
          instrument(id, port, registry);
      }
  
      public InstrumentedServerConnector(String id, int port, @Name("server") Server server, MetricRegistry registry,
              @Name("factories") ConnectionFactory... factories) {
          super(server, factories);
          instrument(id, port, registry);
      }
  
      public InstrumentedServerConnector(String id, int port, @Name("server") Server server,
              @Name("sslContextFactory") SslContextFactory sslContextFactory, MetricRegistry registry) {
          super(server, sslContextFactory);
          instrument(id, port, registry);
      }
  
      @Override
      public void accept(int acceptorID) throws IOException {
          super.accept(acceptorID);
          this.accepts.mark();
      }
  
      @Override
      public void close() {
          super.close();
          this.disconnects.mark();
          this.connections.dec();
      }
  
      /**
       * Create metrics.
       * 
       * @param id
       * @param port
       * @param registry
       */
      private void instrument(String id, int port, MetricRegistry registry) {
          this.setPort(port);
          this.accepts = registry.meter(id + "-accepts");
          this.connects = registry.meter(id + "-connects");
          this.disconnects = registry.meter(id + "-disconnects");
          this.connections = registry.counter(id + "-active-connections");
  
      }
  
      @Override
      public void open() throws IOException {
          this.connections.inc();
          super.open();
          this.connects.mark();
      }
  }