us.fatehi.utility.scheduler.AbstractTaskRunner Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of schemacrawler Show documentation

SchemaCrawler is an open-source Java API that makes working with database metadata as easy as working with plain old Java objects. SchemaCrawler is also a database schema discovery and comprehension, and schema documentation tool. You can search for database schema objects using regular expressions, and output the schema and data in a readable text format. The output is designed to be diff-ed against other database schemas.

There is a newer version: 16.22.3

Show newest version

/*
========================================================================
SchemaCrawler
http://www.schemacrawler.com
Copyright (c) 2000-2024, Sualeh Fatehi .
All rights reserved.
------------------------------------------------------------------------

SchemaCrawler is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SchemaCrawler and the accompanying materials are made available under
the terms of the Eclipse Public License v1.0, GNU General Public License
v3 or GNU Lesser General Public License v3.

You may elect to redistribute this code under any of these licenses.

The Eclipse Public License is available at:
http://www.eclipse.org/legal/epl-v10.html

The GNU General Public License v3 and the GNU Lesser General Public
License v3 are available at:
http://www.gnu.org/licenses/

========================================================================
*/

package us.fatehi.utility.scheduler;

import static java.time.temporal.ChronoField.HOUR_OF_DAY;
import static java.time.temporal.ChronoField.MINUTE_OF_HOUR;
import static java.time.temporal.ChronoField.NANO_OF_SECOND;
import static java.time.temporal.ChronoField.SECOND_OF_MINUTE;
import static us.fatehi.utility.Utility.requireNotBlank;

import java.time.Duration;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.util.Collection;
import java.util.Queue;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.function.BiFunction;
import java.util.function.Supplier;
import java.util.logging.Level;
import java.util.logging.Logger;

abstract class AbstractTaskRunner implements TaskRunner {

  private static final Logger LOGGER = Logger.getLogger(AbstractTaskRunner.class.getName());

  private final String id;
  private final Queue taskDefinitions;
  private final Queue taskResults;

  public AbstractTaskRunner(final String id) {
    this.id = requireNotBlank(id, "No id provided");

    taskDefinitions = new LinkedBlockingDeque<>();
    taskResults = new LinkedBlockingDeque<>();
  }

  @Override
  public final void add(final TaskDefinition taskDefinition) throws Exception {

    if (taskDefinition == null) {
      return;
    }
    if (isStopped()) {
      throw new IllegalStateException("Task runner is stopped");
    }

    taskDefinitions.add(taskDefinition);
  }

  @Override
  public final String getId() {
    return id;
  }

  @Override
  public abstract boolean isStopped();

  /**
   * Allows for a deferred conversion to a string. Useful in logging.
   *
   * @return String supplier.
   */
  @Override
  public final Supplier report() {

    return () -> {
      final BiFunction calculatePercentage =
          (final Duration duration, final Duration totalDuration) -> {
            final long totalMillis = totalDuration.toMillis();
            if (totalMillis == 0) {
              return 0d;
            } else {
              return duration.toMillis() * 100D / totalMillis;
            }
          };

      final DateTimeFormatter df =
          new DateTimeFormatterBuilder()
              .appendValue(HOUR_OF_DAY, 2)
              .appendLiteral(':')
              .appendValue(MINUTE_OF_HOUR, 2)
              .appendLiteral(':')
              .appendValue(SECOND_OF_MINUTE, 2)
              .appendFraction(NANO_OF_SECOND, 3, 3, true)
              .toFormatter();

      Duration totalDuration = Duration.ofNanos(0);
      for (final TimedTaskResult task : taskResults) {
        totalDuration = totalDuration.plus(task.getDuration());
      }

      final StringBuilder buffer = new StringBuilder(1024);

      final LocalTime totalDurationLocal = LocalTime.ofNanoOfDay(totalDuration.toNanos());
      buffer.append(
          String.format(
              "Total time taken for <%s> - %s hours%n", id, totalDurationLocal.format(df)));

      for (final TimedTaskResult task : taskResults) {
        buffer.append(
            String.format(
                "-%5.1f%% - %s%n",
                calculatePercentage.apply(task.getDuration(), totalDuration), task));
      }

      taskResults.clear();

      return buffer.toString();
    };
  }

  @Override
  public abstract void stop();

  @Override
  public final void submit() throws Exception {
    final Collection runTaskResults = runTimed(taskDefinitions);
    taskResults.addAll(runTaskResults);
    taskDefinitions.clear();

    // Stop, report and throw on an exception
    boolean hasException = false;
    Exception exception = null;
    for (final TimedTaskResult runTaskResult : runTaskResults) {
      if (runTaskResult.hasException()) {
        hasException = true;
        final Exception runTaskException = runTaskResult.getException();
        if (exception == null) {
          exception = runTaskException;
        } else {
          exception.addSuppressed(runTaskException);
        }
      }
    }
    if (hasException) {
      stop();
      LOGGER.log(Level.CONFIG, report());
      throw exception;
    }
  }

  abstract Collection runTimed(final Collection taskDefinitions)
      throws Exception;
}