/*
 * 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.geode.internal.admin.remote;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.List;

import org.apache.geode.distributed.internal.AdminMessageType;
import org.apache.geode.distributed.internal.ClusterDistributionManager;
import org.apache.geode.distributed.internal.HighPriorityDistributionMessage;
import org.apache.geode.distributed.internal.membership.InternalDistributedMember;
import org.apache.geode.internal.serialization.DeserializationContext;
import org.apache.geode.internal.serialization.SerializationContext;

/**
 * A message that is sent as a reply to a {@link AdminRequest}.
 */
public abstract class AdminResponse extends HighPriorityDistributionMessage
    implements AdminMessageType {

  // instance variables

  private int msgId; // message id of request this is a response to

  // instance methods

  int getMsgId() {
    return msgId;
  }

  public void setMsgId(int msgId) {
    this.msgId = msgId;
  }

  @Override
  public boolean sendViaUDP() {
    return true;
  }

  /**
   * This method is invoked on the side that sent the original AdminRequest.
   */
  @Override
  protected void process(ClusterDistributionManager dm) {
    AdminWaiters.sendResponse(this);
  }

  @Override
  public void toData(DataOutput out,
      SerializationContext context) throws IOException {
    // System.out.println("BEGIN AdminResponse toData");
    super.toData(out, context);
    out.writeInt(msgId);
    // System.out.println("END AdminResponse toData");
  }

  @Override
  public void fromData(DataInput in,
      DeserializationContext context) throws IOException, ClassNotFoundException {
    super.fromData(in, context);
    msgId = in.readInt();
  }

  public InternalDistributedMember getRecipient() {
    List<InternalDistributedMember> recipients = getRecipients();
    int size = recipients.size();
    if (size == 0) {
      return null;
    } else if (size > 1) {
      throw new IllegalStateException(String
          .format("Could not return one recipient because this message has %s recipients", size));
    } else {
      return recipients.get(0);
    }
  }
}
