geode-core/src/main/java/org/apache/geode/cache/client/internal/locator/LocatorListResponse.java

/*
 * 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.cache.client.internal.locator;

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

import org.apache.geode.distributed.internal.ServerLocation;
import org.apache.geode.internal.DataSerializableFixedID;

public class LocatorListResponse extends ServerLocationResponse {
  /** ArrayList of ServerLocations for controllers */
  private List<ServerLocation> controllers;
  private boolean isBalanced;
  private boolean locatorsFound = false;

  /** Used by DataSerializer */
  public LocatorListResponse() {}

  public LocatorListResponse(List<ServerLocation> locators, boolean isBalanced) {
    this.controllers = locators;
    if (locators != null && !locators.isEmpty()) {
      this.locatorsFound = true;
    }
    this.isBalanced = isBalanced;
  }

  @Override
  public void fromData(DataInput in) throws IOException, ClassNotFoundException {
    this.controllers = SerializationHelper.readServerLocationList(in);
    this.isBalanced = in.readBoolean();
    if (this.controllers != null && !this.controllers.isEmpty()) {
      this.locatorsFound = true;
    }
  }

  @Override
  public void toData(DataOutput out) throws IOException {
    SerializationHelper.writeServerLocationList(this.controllers, out);
    out.writeBoolean(isBalanced);
  }

  /**
   * Returns an array list of type ServerLocation containing controllers.
   *
   * @return list of controllers
   */
  public List<ServerLocation> getLocators() {
    return this.controllers;
  }

  /**
   * Returns whether or not the locator thinks that the servers in this group are currently
   * balanced.
   *
   * @return true if the servers are balanced.
   */
  public boolean isBalanced() {
    return isBalanced;
  }

  @Override
  public String toString() {
    return "LocatorListResponse{locators=" + controllers + ",isBalanced=" + isBalanced + "}";
  }

  @Override
  public int getDSFID() {
    return DataSerializableFixedID.LOCATOR_LIST_RESPONSE;
  }

  @Override
  public boolean hasResult() {
    return this.locatorsFound;
  }

}