/*
 * 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
 *
 *   https://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.accumulo.test.functional;

import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import org.apache.accumulo.core.client.IteratorSetting;
import org.apache.accumulo.core.data.ByteSequence;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Range;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.iterators.IteratorEnvironment;
import org.apache.accumulo.core.iterators.SortedKeyValueIterator;
import org.apache.accumulo.core.iterators.WrappingIterator;
import org.apache.accumulo.core.util.UtilWaitThread;

public class SlowIterator extends WrappingIterator {

  private static final String SLEEP_TIME = "sleepTime";
  private static final String SEEK_SLEEP_TIME = "seekSleepTime";
  private static final String SLEEP_UNINTERRUPTIBLY = "sleepUninterruptibly";

  private long sleepTime = 0;
  private long seekSleepTime = 0;
  private boolean sleepUninterruptibly = true;

  public static void setSleepTime(IteratorSetting is, long millis) {
    is.addOption(SLEEP_TIME, Long.toString(millis));
  }

  public static void setSeekSleepTime(IteratorSetting is, long t) {
    is.addOption(SEEK_SLEEP_TIME, Long.toString(t));
  }

  public static void sleepUninterruptibly(IteratorSetting is, boolean b) {
    is.addOption(SLEEP_UNINTERRUPTIBLY, Boolean.toString(b));
  }

  private void sleep(long time) throws IOException {
    if (sleepUninterruptibly) {
      UtilWaitThread.sleepUninterruptibly(time, TimeUnit.MILLISECONDS);
    } else {
      try {
        Thread.sleep(sleepTime);
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
        throw new IOException(e);
      }
    }
  }

  @Override
  public SortedKeyValueIterator<Key,Value> deepCopy(IteratorEnvironment env) {
    throw new UnsupportedOperationException();
  }

  @Override
  public void next() throws IOException {
    sleep(sleepTime);
    super.next();
  }

  @Override
  public void seek(Range range, Collection<ByteSequence> columnFamilies, boolean inclusive)
      throws IOException {
    sleep(seekSleepTime);
    super.seek(range, columnFamilies, inclusive);
  }

  @Override
  public void init(SortedKeyValueIterator<Key,Value> source, Map<String,String> options,
      IteratorEnvironment env) throws IOException {
    super.init(source, options, env);
    if (options.containsKey(SLEEP_TIME)) {
      sleepTime = Long.parseLong(options.get(SLEEP_TIME));
    }

    if (options.containsKey(SEEK_SLEEP_TIME)) {
      seekSleepTime = Long.parseLong(options.get(SEEK_SLEEP_TIME));
    }

    if (options.containsKey(SLEEP_UNINTERRUPTIBLY)) {
      sleepUninterruptibly = Boolean.parseBoolean(options.get(SLEEP_UNINTERRUPTIBLY));
    }
  }

}
