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.distributedlog;
  
  import org.apache.distributedlog.common.util.PermitLimiter;
  import org.apache.distributedlog.exceptions.OverCapacityException;
  
  class WriteLimiter {
  
      String streamName;
      final PermitLimiter streamLimiter;
      final PermitLimiter globalLimiter;
  
      public WriteLimiter(String streamName, PermitLimiter streamLimiter, PermitLimiter globalLimiter) {
          this.streamName = streamName;
          this.streamLimiter = streamLimiter;
          this.globalLimiter = globalLimiter;
      }
  
      public void acquire() throws OverCapacityException {
          if (!streamLimiter.acquire()) {
              throw new OverCapacityException(String.format("Stream write capacity exceeded for stream %s", streamName));
          }
          try {
              if (!globalLimiter.acquire()) {
                  throw new OverCapacityException("Global write capacity exceeded");
              }
          } catch (OverCapacityException ex) {
              streamLimiter.release(1);
              throw ex;
          }
      }
  
      public void release() {
          release(1);
      }
  
      public void release(int permits) {
          streamLimiter.release(permits);
          globalLimiter.release(permits);
      }
  
      public void close() {
          streamLimiter.close();
          globalLimiter.close();
      }
  }
  