content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.bifromq.retain.server.scheduler;
  
  import org.apache.bifromq.retain.rpc.proto.BatchRetainRequest;
  import org.apache.bifromq.retain.rpc.proto.RetainMessage;
  import org.apache.bifromq.retain.rpc.proto.RetainParam;
  import org.apache.bifromq.retain.rpc.proto.RetainRequest;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  
  class BatchRetainCallHelper {
      static BatchRetainRequest makeBatch(Iterator<RetainRequest> retainRequestIterator) {
          Map<String, RetainParam.Builder> retainMsgPackBuilders = new HashMap<>(128);
          retainRequestIterator.forEachRemaining(request ->
              retainMsgPackBuilders.computeIfAbsent(request.getPublisher().getTenantId(), k -> RetainParam.newBuilder())
                  .putTopicMessages(request.getTopic(), RetainMessage.newBuilder()
                      .setMessage(request.getMessage().toBuilder().setIsRetained(true).build())
                      .setPublisher(request.getPublisher())
                      .build()));
          long reqId = System.nanoTime();
          BatchRetainRequest.Builder reqBuilder = BatchRetainRequest.newBuilder().setReqId(reqId);
          retainMsgPackBuilders.forEach((tenantId, retainMsgPackBuilder) ->
              reqBuilder.putParams(tenantId, retainMsgPackBuilder.build()));
          return reqBuilder.build();
      }
  }
  