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.asterix.common.context;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.asterix.common.api.IDiskWriteRateLimiterProvider;
  import org.apache.asterix.common.api.INcApplicationContext;
  import org.apache.asterix.common.utils.StoragePathUtil;
  import org.apache.hyracks.api.application.INCServiceContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.storage.common.IResource;
  import org.apache.hyracks.storage.common.buffercache.IRateLimiter;
  import org.apache.hyracks.storage.common.buffercache.SleepRateLimiter;
  
  public class DiskWriteRateLimiterProvider implements IDiskWriteRateLimiterProvider {
      // stores the write rate limiter for each NC partition
      private final Map<Integer, IRateLimiter> limiters = new HashMap<>();
  
      @Override
      public synchronized IRateLimiter getRateLimiter(INCServiceContext serviceCtx, IResource resource)
              throws HyracksDataException {
          int partition = StoragePathUtil.getPartitionNumFromRelativePath(resource.getPath());
          IRateLimiter limiter = limiters.get(partition);
          if (limiter == null) {
              INcApplicationContext appCtx = (INcApplicationContext) serviceCtx.getApplicationContext();
              long writeRateLimit = appCtx.getStorageProperties().getWriteRateLimit();
              limiter = SleepRateLimiter.create(writeRateLimit);
              limiters.put(partition, limiter);
          }
          return limiter;
      }
  
  }
  