ujes/entrance/src/main/scala/com/webank/wedatasphere/linkis/entrance/log/CacheLogWriter.scala

/*
 * 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.
 */

/**
  * author: enjoyyin
  * date: 2018/9/5
  * time: 14:32
  * Description:
  */
package com.webank.wedatasphere.linkis.entrance.log

import org.apache.commons.lang.StringUtils

class CacheLogWriter(logPath:String,
                     charset:String,
                     sharedCache:Cache,
                     user: String)
  extends AbstractLogWriter(logPath, user, charset) {

  def getCache:Option[Cache] = Some(sharedCache)

  private def cache(msg:String): Unit = {
    this synchronized {
      val removed = sharedCache.cachedLogs.add(msg)
      if (removed != null){
        val logs = sharedCache.cachedLogs.toList
        val sb = new StringBuilder
        sb.append(removed).append("\n")
        logs.filter(_ != null).foreach(log => sb.append(log).append("\n"))
        sharedCache.cachedLogs.fakeClear()
        super.write(sb.toString())
      }
    }
  }
  override def write(msg: String): Unit = {
    if (StringUtils.isBlank(msg)){
      cache("")
    }else{
      val rows = msg.split("\n")
      rows.foreach(row => {
        if (row == null) cache("") else cache(row)
      })
    }
  }

  override def flush(): Unit = {
    sharedCache.cachedLogs.toList.filter(StringUtils.isNotEmpty).foreach(super.write)
    sharedCache.cachedLogs.clear()
    super.flush()
  }

}