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gRPC: Netty
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/*
 * Copyright 2014, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 *    * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package io.grpc.netty;

import io.grpc.internal.AbstractStream2;
import io.grpc.internal.Stream;

/**
 * Command which requests messages from the deframer.
 */
class RequestMessagesCommand extends WriteQueue.AbstractQueuedCommand {

  private final int numMessages;
  private final Stream stream;
  private final AbstractStream2.TransportState state;

  public RequestMessagesCommand(Stream stream, int numMessages) {
    this.state = null;
    this.numMessages = numMessages;
    this.stream = stream;
  }

  public RequestMessagesCommand(AbstractStream2.TransportState state, int numMessages) {
    this.state = state;
    this.numMessages = numMessages;
    this.stream = null;
  }

  void requestMessages() {
    if (stream != null) {
      stream.request(numMessages);
    } else {
      state.requestMessagesFromDeframer(numMessages);
    }
  }
}