/**
 * 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.hadoop.hbase.client;

import static org.junit.Assert.assertEquals;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.testclassification.ClientTests;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.Threads;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category({ MediumTests.class, ClientTests.class })
public class TestAsyncTableScanRenewLease {

  private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();

  private static TableName TABLE_NAME = TableName.valueOf("async");

  private static byte[] FAMILY = Bytes.toBytes("cf");

  private static byte[] CQ = Bytes.toBytes("cq");

  private static AsyncConnection CONN;

  private static RawAsyncTable TABLE;

  private static int SCANNER_LEASE_TIMEOUT_PERIOD_MS = 5000;

  @BeforeClass
  public static void setUp() throws Exception {
    TEST_UTIL.getConfiguration().setInt(HConstants.HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD,
      SCANNER_LEASE_TIMEOUT_PERIOD_MS);
    TEST_UTIL.startMiniCluster(1);
    TEST_UTIL.createTable(TABLE_NAME, FAMILY);
    CONN = ConnectionFactory.createAsyncConnection(TEST_UTIL.getConfiguration()).get();
    TABLE = CONN.getRawTable(TABLE_NAME);
    TABLE.putAll(IntStream.range(0, 10).mapToObj(
      i -> new Put(Bytes.toBytes(String.format("%02d", i))).addColumn(FAMILY, CQ, Bytes.toBytes(i)))
        .collect(Collectors.toList())).get();
  }

  @AfterClass
  public static void tearDown() throws Exception {
    CONN.close();
    TEST_UTIL.shutdownMiniCluster();
  }

  private static final class RenewLeaseConsumer implements RawScanResultConsumer {

    private final List<Result> results = new ArrayList<>();

    private Throwable error;

    private boolean finished = false;

    private boolean suspended = false;

    @Override
    public synchronized void onNext(Result[] results, ScanController controller) {
      for (Result result : results) {
        this.results.add(result);
      }
      if (!suspended) {
        ScanResumer resumer = controller.suspend();
        new Thread(() -> {
          Threads.sleep(2 * SCANNER_LEASE_TIMEOUT_PERIOD_MS);
          try {
            TABLE.put(new Put(Bytes.toBytes(String.format("%02d", 10))).addColumn(FAMILY, CQ,
              Bytes.toBytes(10))).get();
          } catch (Exception e) {
            onError(e);
          }
          resumer.resume();
        }).start();
      }
    }

    @Override
    public synchronized void onError(Throwable error) {
      this.finished = true;
      this.error = error;
      notifyAll();
    }

    @Override
    public synchronized void onComplete() {
      this.finished = true;
      notifyAll();
    }

    public synchronized List<Result> get() throws Throwable {
      while (!finished) {
        wait();
      }
      if (error != null) {
        throw error;
      }
      return results;
    }
  }

  @Test
  public void test() throws Throwable {
    RenewLeaseConsumer consumer = new RenewLeaseConsumer();
    TABLE.scan(new Scan(), consumer);
    List<Result> results = consumer.get();
    // should not see the newly added value
    assertEquals(10, results.size());
    IntStream.range(0, 10).forEach(i -> {
      Result result = results.get(i);
      assertEquals(String.format("%02d", i), Bytes.toString(result.getRow()));
      assertEquals(i, Bytes.toInt(result.getValue(FAMILY, CQ)));
    });
    // now we can see the newly added value
    List<Result> results2 = TABLE.scanAll(new Scan()).get();
    assertEquals(11, results2.size());
    IntStream.range(0, 11).forEach(i -> {
      Result result = results2.get(i);
      assertEquals(String.format("%02d", i), Bytes.toString(result.getRow()));
      assertEquals(i, Bytes.toInt(result.getValue(FAMILY, CQ)));
    });
  }
}