/*
* 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.spark.status.api.v1

import javax.ws.rs.{GET, Produces}
import javax.ws.rs.core.MediaType

import org.apache.spark.ui.SparkUI
import org.apache.spark.ui.exec.ExecutorsPage

@Produces(Array(MediaType.APPLICATION_JSON))
private[v1] class ExecutorListResource(ui: SparkUI) {

  @GET
  def executorList(): Seq[ExecutorSummary] = {
    val listener = ui.executorsListener
    listener.synchronized {
      // The follow codes should be protected by `listener` to make sure no executors will be
      // removed before we query their status. See SPARK-12784.
      val storageStatusList = listener.activeStorageStatusList
      (0 until storageStatusList.size).map { statusId =>
        ExecutorsPage.getExecInfo(listener, statusId, isActive = true)
      }
    }
  }
}
