src/main/java/org/apache/accumulo/examples/cli/BatchWriterOpts.java

/*
 * 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.accumulo.examples.cli;

import java.time.Duration;
import java.util.concurrent.TimeUnit;

import org.apache.accumulo.core.client.BatchWriterConfig;

import com.beust.jcommander.IStringConverter;
import com.beust.jcommander.Parameter;

public class BatchWriterOpts {
  private static final BatchWriterConfig BWDEFAULTS = new BatchWriterConfig();

  public static class TimeConverter implements IStringConverter<Long> {
    @Override
    public Long convert(String value) {
      if (value.matches("[0-9]+"))
        value = "PT" + value + "S"; // if only numbers then assume seconds
      return Duration.parse(value).toMillis();
    }
  }

  public static class MemoryConverter implements IStringConverter<Long> {
    @Override
    public Long convert(String str) {
      try {
        char lastChar = str.charAt(str.length() - 1);
        int multiplier = 0;
        switch (Character.toUpperCase(lastChar)) {
          case 'G':
            multiplier += 10;
          case 'M':
            multiplier += 10;
          case 'K':
            multiplier += 10;
          case 'B':
            break;
          default:
            return Long.parseLong(str);
        }
        return Long.parseLong(str.substring(0, str.length() - 1)) << multiplier;
      } catch (Exception ex) {
        throw new IllegalArgumentException(
            "The value '" + str + "' is not a valid memory setting. A valid value would a number "
                + "possibily followed by an optional 'G', 'M', 'K', or 'B'.");
      }
    }
  }

  @Parameter(names = "--batchThreads",
      description = "Number of threads to use when writing large batches")
  public Integer batchThreads = BWDEFAULTS.getMaxWriteThreads();

  @Parameter(names = "--batchLatency", converter = TimeConverter.class,
      description = "The maximum time to wait before flushing data to servers when writing")
  public Long batchLatency = BWDEFAULTS.getMaxLatency(TimeUnit.MILLISECONDS);

  @Parameter(names = "--batchMemory", converter = MemoryConverter.class,
      description = "memory used to batch data when writing")
  public Long batchMemory = BWDEFAULTS.getMaxMemory();

  @Parameter(names = "--batchTimeout", converter = TimeConverter.class,
      description = "timeout used to fail a batch write")
  public Long batchTimeout = BWDEFAULTS.getTimeout(TimeUnit.MILLISECONDS);

  public BatchWriterConfig getBatchWriterConfig() {
    BatchWriterConfig config = new BatchWriterConfig();
    config.setMaxWriteThreads(this.batchThreads);
    config.setMaxLatency(this.batchLatency, TimeUnit.MILLISECONDS);
    config.setMaxMemory(this.batchMemory);
    config.setTimeout(this.batchTimeout, TimeUnit.MILLISECONDS);
    return config;
  }

}