content: /*
   * Copyright 2014-2025 Real Logic Limited.
   *
   * 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
   *
   * https://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.aeron.driver.media;
  
  import org.agrona.ErrorHandler;
  import org.agrona.nio.TransportPoller;
  
  import java.nio.channels.SelectionKey;
  
  /**
   * Encapsulates the polling of a number of {@link UdpChannelTransport}s using whatever means provides the
   * lowest latency.
   */
  public abstract class UdpTransportPoller extends TransportPoller
  {
      /**
       * {@link ErrorHandler} which can be used to log errors and continue.
       */
      protected final ErrorHandler errorHandler;
  
      /**
       * Construct a new {@link TransportPoller} with an {@link ErrorHandler} for logging.
       *
       * @param errorHandler which can be used to log errors and continue.
       */
      public UdpTransportPoller(final ErrorHandler errorHandler)
      {
          this.errorHandler = errorHandler;
      }
  
      /**
       * Explicit event loop processing as a poll.
       *
       * @return the number of frames processed.
       */
      public abstract int pollTransports();
  
      /**
       * Register channel for read.
       *
       * @param transport to associate with read.
       * @return {@link SelectionKey} for registration to cancel.
       */
      public abstract SelectionKey registerForRead(UdpChannelTransport transport);
  
      /**
       * Cancel previous registration.
       *
       * @param transport to cancel read for
       */
      public abstract void cancelRead(UdpChannelTransport transport);
  }
  