content: /*
   * Copyright 2012-2021 Aerospike, Inc.
   *
   * Portions may be licensed to Aerospike, Inc. under one or more contributor
   * license agreements WHICH ARE COMPATIBLE WITH THE APACHE LICENSE, VERSION 2.0.
   *
   * 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 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 com.aerospike.client.async;
  
  /**
   * Use multiple throttles that enforce a limit on the maximum number of commands.
   * Useful in sync scan/async touch situations where scan thread needs to slow down
   * sending commands to event loops, so the event loop queues do not get overloaded.
   *
   * Warning: Do not wait for slots directly from event loop threads.  Deadlock
   * may occur in that situation.
   */
  public final class Throttles {
  	private final Throttle[] throttles;
  
  	/**
  	 * Construct throttles.
  	 */
  	public Throttles(int size, int maxCommandsPerEventLoop) {
  		throttles = new Throttle[size];
  
  		for (int i = 0; i < throttles.length; i++) {
  			throttles[i] = new Throttle(maxCommandsPerEventLoop);
  		}
  	}
  
  	/**
  	 * Wait for a throttle's command slot(s).
  	 *
  	 * @param index		array index
  	 * @param count		count of commands to reserve
  	 * @return			if command should be processed
  	 */
  	public boolean waitForSlot(int index, int count) {
  		return throttles[index].waitForSlot(count);
  	}
  
  	/**
  	 * Recover slot(s) from commands that have completed.
  	 *
  	 * @param index		array index
  	 * @param count		count of commands to reclaim
  	 */
  	public void addSlot(int index, int count) {
  		throttles[index].addSlot(count);
  	}
  
  	/**
  	 * Get current number of commands that could be run for a throttle.
  	 */
  	public int getAvailable(int index) {
  		return throttles[index].getAvailable();
  	}
  }
  