/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.client5.http.impl;
  
  import java.util.concurrent.ThreadFactory;
  
  import org.apache.hc.core5.annotation.Contract;
  import org.apache.hc.core5.annotation.ThreadingBehavior;
  import org.apache.hc.core5.concurrent.DefaultThreadFactory;
  import org.apache.hc.core5.pool.ConnPoolControl;
  import org.apache.hc.core5.util.Args;
  import org.apache.hc.core5.util.TimeValue;
  import org.apache.hc.core5.util.Timeout;
  
  /**
   * This class maintains a background thread to enforce an eviction policy for expired / idle
   * persistent connections kept alive in the connection pool.
   *
   * @since 4.4
   */
  @Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL)
  public final class IdleConnectionEvictor {
  
      private final ThreadFactory threadFactory;
      private final Thread thread;
  
      public IdleConnectionEvictor(final ConnPoolControl<?> connectionManager, final ThreadFactory threadFactory,
                                   final TimeValue sleepTime, final TimeValue maxIdleTime) {
          Args.notNull(connectionManager, "Connection manager");
          this.threadFactory = threadFactory != null ? threadFactory : new DefaultThreadFactory("idle-connection-evictor", true);
          final TimeValue localSleepTime = sleepTime != null ? sleepTime : TimeValue.ofSeconds(5);
          this.thread = this.threadFactory.newThread(() -> {
              try {
                  while (!Thread.currentThread().isInterrupted()) {
                      localSleepTime.sleep();
                      connectionManager.closeExpired();
                      if (maxIdleTime != null) {
                          connectionManager.closeIdle(maxIdleTime);
                      }
                  }
              } catch (final InterruptedException ex) {
                  Thread.currentThread().interrupt();
              } catch (final Exception ex) {
              }
  
          });
      }
  
      public IdleConnectionEvictor(final ConnPoolControl<?> connectionManager, final TimeValue sleepTime, final TimeValue maxIdleTime) {
          this(connectionManager, null, sleepTime, maxIdleTime);
      }
  
      public IdleConnectionEvictor(final ConnPoolControl<?> connectionManager, final TimeValue maxIdleTime) {
          this(connectionManager, null, maxIdleTime, maxIdleTime);
      }
  
      public void start() {
          thread.start();
      }
  
      public void shutdown() {
          thread.interrupt();
      }
  
      public boolean isRunning() {
          return thread.isAlive();
      }
  
      public void awaitTermination(final Timeout timeout) throws InterruptedException {
          thread.join(timeout != null ? timeout.toMilliseconds() : Long.MAX_VALUE);
      }
  
  }