/*
 * Copyright 2019 WeBank
 *
 * Licensed 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.
 */

/*
 * Created by ${USER} on ${DATE}.
 */

package com.webank.wedatasphere.linkis.httpclient.loadbalancer

import java.util

import com.webank.wedatasphere.linkis.httpclient.discovery.DiscoveryListener

/**
  * Created by enjoyyin on 2019/5/22.
  */
abstract class AbstractLoadBalancer extends LoadBalancer with DiscoveryListener {

  private val serverUrls = new util.HashSet[String]
  private val unhealthyServerUrls = new util.HashSet[String]

  override def onServerDiscovered(serverUrl: String): Unit = {
    serverUrls synchronized serverUrls.add(serverUrl)
    if(unhealthyServerUrls.contains(serverUrl)) unhealthyServerUrls synchronized {
      unhealthyServerUrls.remove(serverUrl)
    }
  }

  override def onServerUnconnected(serverUrl: String): Unit = {
    serverUrls synchronized serverUrls.remove(serverUrl)
    unhealthyServerUrls synchronized unhealthyServerUrls.remove(serverUrl)
  }

  override def onServerUnhealthy(serverUrl: String): Unit = {
    unhealthyServerUrls synchronized unhealthyServerUrls.add(serverUrl)
  }

  override def onServerHealthy(serverUrl: String): Unit = {
    unhealthyServerUrls synchronized unhealthyServerUrls.remove(serverUrl)
    serverUrls synchronized serverUrls.add(serverUrl)
  }

  override def getAllServerUrls: Array[String] = serverUrls.toArray(new Array[String](serverUrls.size()))

  def getAllUnhealthyServerUrls: Array[String] = unhealthyServerUrls.toArray(new Array[String](unhealthyServerUrls.size()))
}
