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.celeborn.common.network.util;
  
  import java.util.concurrent.atomic.AtomicLong;
  
  import io.netty.util.concurrent.EventExecutor;
  import io.netty.util.concurrent.EventExecutorChooserFactory;
  
  public final class ConflictAvoidEventExecutorChooserFactory implements EventExecutorChooserFactory {
    public static final ConflictAvoidEventExecutorChooserFactory INSTANCE =
        new ConflictAvoidEventExecutorChooserFactory();
  
    private ConflictAvoidEventExecutorChooserFactory() {}
  
    @Override
    public EventExecutorChooser newChooser(EventExecutor[] executors) {
      return new ConflictAvoidEventExecutorChooser(executors);
    }
  
    private static final class ConflictAvoidEventExecutorChooser implements EventExecutorChooser {
      private final AtomicLong idx = new AtomicLong();
      private final EventExecutor[] executors;
  
      ConflictAvoidEventExecutorChooser(EventExecutor[] executors) {
        this.executors = executors;
      }
  
      @Override
      public EventExecutor next() {
        EventExecutor executor = executors[(int) Math.abs(idx.getAndIncrement() % executors.length)];
        if (executor.inEventLoop()) {
          executor = executors[(int) Math.abs(idx.getAndIncrement() % executors.length)];
        }
        return executor;
      }
    }
  }
  