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.inbox.server.scheduler;
  
  import org.apache.bifromq.basekv.client.IBaseKVStoreClient;
  import org.apache.bifromq.basekv.client.scheduler.BatchQueryCall;
  import org.apache.bifromq.basekv.client.scheduler.IBatchQueryCallBuilder;
  import org.apache.bifromq.basekv.client.scheduler.QueryCallScheduler;
  import org.apache.bifromq.sysprops.props.DataPlaneMaxBurstLatencyMillis;
  import com.google.common.base.Preconditions;
  import java.time.Duration;
  import java.util.concurrent.ThreadLocalRandom;
  
  public abstract class InboxReadScheduler<ReqT, RespT, InboxBatchQueryT extends BatchQueryCall<ReqT, RespT>>
      extends QueryCallScheduler<ReqT, RespT, InboxBatchQueryT> {
      protected final int queuesPerRange;
  
      public InboxReadScheduler(IBatchQueryCallBuilder<ReqT, RespT, InboxBatchQueryT> batchQueryCallBuilder,
                                int queuesPerRange, IBaseKVStoreClient inboxStoreClient) {
          super(batchQueryCallBuilder, Duration.ofSeconds(DataPlaneMaxBurstLatencyMillis.INSTANCE.get()).toNanos(),
              inboxStoreClient);
          Preconditions.checkArgument(queuesPerRange > 0, "Queues per range must be positive");
          this.queuesPerRange = queuesPerRange;
      }
  
      @Override
      protected int selectQueue(ReqT request) {
          return ThreadLocalRandom.current().nextInt(0, queuesPerRange);
      }
  }
  