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.cluster.service;
  
  import io.aeron.ExclusivePublication;
  import io.aeron.cluster.codecs.ClientSessionEncoder;
  import io.aeron.cluster.codecs.MessageHeaderEncoder;
  import org.agrona.ExpandableArrayBuffer;
  import org.agrona.MutableDirectBuffer;
  import org.agrona.concurrent.AgentInvoker;
  import org.agrona.concurrent.IdleStrategy;
  
  final class ServiceSnapshotTaker extends SnapshotTaker
  {
      private final ExpandableArrayBuffer offerBuffer = new ExpandableArrayBuffer(1024);
      private final ClientSessionEncoder clientSessionEncoder = new ClientSessionEncoder();
  
      ServiceSnapshotTaker(
          final ExclusivePublication publication, final IdleStrategy idleStrategy, final AgentInvoker aeronClientInvoker)
      {
          super(publication, idleStrategy, aeronClientInvoker);
      }
  
      void snapshotSession(final ClientSession session)
      {
          final String responseChannel = session.responseChannel();
          final byte[] encodedPrincipal = session.encodedPrincipal();
          final int length = MessageHeaderEncoder.ENCODED_LENGTH + ClientSessionEncoder.BLOCK_LENGTH +
              ClientSessionEncoder.responseChannelHeaderLength() + responseChannel.length() +
              ClientSessionEncoder.encodedPrincipalHeaderLength() + encodedPrincipal.length;
          if (length <= publication.maxPayloadLength())
          {
              idleStrategy.reset();
              while (true)
              {
                  final long result = publication.tryClaim(length, bufferClaim);
                  if (result > 0)
                  {
                      final MutableDirectBuffer buffer = bufferClaim.buffer();
                      final int offset = bufferClaim.offset();
  
                      encodeSession(session, responseChannel, encodedPrincipal, buffer, offset);
                      bufferClaim.commit();
                      break;
                  }
  
                  checkResultAndIdle(result);
              }
          }
          else
          {
              final int offset = 0;
              encodeSession(session, responseChannel, encodedPrincipal, offerBuffer, offset);
              offer(offerBuffer, offset, length);
          }
      }
  
      private void encodeSession(
          final ClientSession session,
          final String responseChannel,
          final byte[] encodedPrincipal,
          final MutableDirectBuffer buffer,
          final int offset)
      {
          clientSessionEncoder
              .wrapAndApplyHeader(buffer, offset, messageHeaderEncoder)
              .clusterSessionId(session.id())
              .responseStreamId(session.responseStreamId())
              .responseChannel(responseChannel)
              .putEncodedPrincipal(encodedPrincipal, 0, encodedPrincipal.length);
      }
  }
  