/*
 * 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.phoenix.iterate;

import java.sql.SQLException;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.phoenix.cache.ServerCacheClient.ServerCache;
import org.apache.phoenix.compile.QueryPlan;
import org.apache.phoenix.exception.SQLExceptionCode;
import org.apache.phoenix.exception.SQLExceptionInfo;
import org.apache.phoenix.execute.MutationState;
import org.apache.phoenix.hbase.index.util.ImmutableBytesPtr;
import org.apache.phoenix.monitoring.ScanMetricsHolder;
import org.apache.phoenix.schema.TableRef;
import org.apache.phoenix.schema.tuple.Tuple;

public class DelayedTableResultIteratorFactory implements TableResultIteratorFactory {

  private final long delay;

  public DelayedTableResultIteratorFactory(long delay) {
    this.delay = delay;
  }

  @Override
  public TableResultIterator newIterator(MutationState mutationState, TableRef tableRef, Scan scan,
    ScanMetricsHolder scanMetricsHolder, long renewLeaseThreshold, QueryPlan plan,
    ParallelScanGrouper scanGrouper, Map<ImmutableBytesPtr, ServerCache> caches,
    long maxQueryEndTime) throws SQLException {
    return new DelayedTableResultIterator(mutationState, tableRef, scan, scanMetricsHolder,
      renewLeaseThreshold, plan, scanGrouper, caches, maxQueryEndTime);
  }

  private class DelayedTableResultIterator extends TableResultIterator {
    public DelayedTableResultIterator(MutationState mutationState, TableRef tableRef, Scan scan,
      ScanMetricsHolder scanMetricsHolder, long renewLeaseThreshold, QueryPlan plan,
      ParallelScanGrouper scanGrouper, Map<ImmutableBytesPtr, ServerCache> caches,
      long maxQueryEndTime) throws SQLException {
      super(mutationState, scan, scanMetricsHolder, renewLeaseThreshold, plan, scanGrouper, caches,
        maxQueryEndTime);
    }

    @Override
    public synchronized void initScanner() throws SQLException {
      super.initScanner();
    }

    @Override
    public Tuple next() throws SQLException {
      delay();
      return super.next();
    }

    private void delay() throws SQLException {
      try {
        new CountDownLatch(1).await(delay, TimeUnit.MILLISECONDS);
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
        throw new SQLExceptionInfo.Builder(SQLExceptionCode.INTERRUPTED_EXCEPTION).setRootCause(e)
          .build().buildException();
      }
    }

  }

}
