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.samples.cluster;
  
  import io.aeron.ExclusivePublication;
  import io.aeron.Image;
  import io.aeron.cluster.codecs.CloseReason;
  import io.aeron.cluster.service.ClientSession;
  import io.aeron.cluster.service.Cluster;
  import io.aeron.cluster.service.ClusteredService;
  import io.aeron.logbuffer.Header;
  import org.agrona.DirectBuffer;
  import org.agrona.concurrent.IdleStrategy;
  
  class EchoService implements ClusteredService
  {
      private static final int SEND_ATTEMPTS = 3;
      protected Cluster cluster;
      protected IdleStrategy idleStrategy;
  
      public void onStart(final Cluster cluster, final Image snapshotImage)
      {
          this.cluster = cluster;
          this.idleStrategy = cluster.idleStrategy();
      }
  
      public void onSessionOpen(final ClientSession session, final long timestamp)
      {
      }
  
      public void onSessionClose(final ClientSession session, final long timestamp, final CloseReason closeReason)
      {
      }
  
      public void onSessionMessage(
          final ClientSession session,
          final long timestamp,
          final DirectBuffer buffer,
          final int offset,
          final int length,
          final Header header)
      {
          idleStrategy.reset();
          int attempts = SEND_ATTEMPTS;
          do
          {
              final long result = session.offer(buffer, offset, length);
              if (result > 0)
              {
                  return;
              }
              idleStrategy.idle();
          }
          while (--attempts > 0);
      }
  
      public void onTimerEvent(final long correlationId, final long timestamp)
      {
      }
  
      public void onTakeSnapshot(final ExclusivePublication snapshotPublication)
      {
      }
  
      public void onRoleChange(final Cluster.Role newRole)
      {
      }
  
      public void onTerminate(final Cluster cluster)
      {
      }
  }
  