content: /*
   * 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 com.alipay.remoting.rpc;
  
  import java.util.LinkedList;
  import java.util.List;
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.ScheduledThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  
  import com.alipay.remoting.AbstractLifeCycle;
  import com.alipay.remoting.LifeCycleException;
  import org.slf4j.Logger;
  
  import com.alipay.remoting.NamedThreadFactory;
  import com.alipay.remoting.Scannable;
  import com.alipay.remoting.log.BoltLoggerFactory;
  
  /**
   * Scanner is used to do scan task.
   * 
   * @author jiangping
   * @version $Id: RpcTaskScanner.java, v 0.1 Mar 4, 2016 3:30:52 PM tao Exp $
   */
  public class RpcTaskScanner extends AbstractLifeCycle {
  
      private static final Logger      logger = BoltLoggerFactory.getLogger("RpcRemoting");
  
      private final List<Scannable>    scanList;
  
      private ScheduledExecutorService scheduledService;
  
      public RpcTaskScanner() {
          this.scanList = new LinkedList<Scannable>();
      }
  
      @Override
      public void startup() throws LifeCycleException {
          super.startup();
  
          scheduledService = new ScheduledThreadPoolExecutor(1, new NamedThreadFactory(
              "RpcTaskScannerThread", true));
          scheduledService.scheduleWithFixedDelay(new Runnable() {
  
              @Override
              public void run() {
                  for (Scannable scanned : scanList) {
                      try {
                          scanned.scan();
                      } catch (Throwable t) {
                          logger.error("Exception caught when scannings.", t);
                      }
                  }
              }
  
          }, 10000, 10000, TimeUnit.MILLISECONDS);
      }
  
      @Override
      public void shutdown() throws LifeCycleException {
          super.shutdown();
  
          scheduledService.shutdown();
      }
  
      /**
       * Use {@link RpcTaskScanner#startup()} instead
       */
      @Deprecated
      public void start() {
          startup();
      }
  
      /**
       * Add scan target.
       */
      public void add(Scannable target) {
          scanList.add(target);
      }
  
  }
  