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 com.datastax.oss.driver.internal.core.channel;
  
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelFuture;
  
  /**
   * Optimizes the write operations on Netty channels.
   *
   * <p>Flush operations are generally speaking expensive as these may trigger a syscall on the
   * transport level. Thus it is in most cases (where write latency can be traded with throughput) a
   * good idea to try to minimize flush operations as much as possible. This component allows writes
   * to be accumulated and flushed together for better performance.
   */
  public interface WriteCoalescer {
    /**
     * Writes and flushes the message to the channel, possibly at a later time, but <b>the order of
     * messages must be preserved</b>.
     */
    ChannelFuture writeAndFlush(Channel channel, Object message);
  }
  