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;
  
  import org.agrona.collections.Long2LongHashMap;
  
  class ReceiverLivenessTracker
  {
      private static final int MISSING_VALUE = -1;
  
      private final Long2LongHashMap lastSmTimestampNsByReceiverIdMap = new Long2LongHashMap(MISSING_VALUE);
  
      public boolean hasReceivers()
      {
          return !lastSmTimestampNsByReceiverIdMap.isEmpty();
      }
  
      public void onStatusMessage(final long receiverId, final long nowNs)
      {
          lastSmTimestampNsByReceiverIdMap.put(receiverId, nowNs);
      }
  
      public boolean onRemoteClose(final long receiverId)
      {
          return MISSING_VALUE != lastSmTimestampNsByReceiverIdMap.remove(receiverId);
      }
  
      public void onIdle(final long nowNs, final long timeoutNs)
      {
          final long timeoutThresholdNs = nowNs - timeoutNs;
          final Long2LongHashMap.EntryIterator iterator = lastSmTimestampNsByReceiverIdMap.entrySet().iterator();
          while (iterator.hasNext())
          {
              iterator.next();
              if (iterator.getLongValue() <= timeoutThresholdNs)
              {
                  iterator.remove();
              }
          }
      }
  }
  