io.palyvos.haren.TaskDependency Maven / Gradle / Ivy

Go to download

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

A scheduling framework for Stream Processing Systems.

The newest version!

/*
 * Copyright 2018-2019
 *     Dimitris Palyvos-Giannas
 *     Vincenzo Gulisano
 *     Marina Papatriantafilou
 *
 * Licensed 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.
 *
 * Contact:
 *     Dimitris Palyvos-Giannas [email protected]
 */

package io.palyvos.haren;

import java.util.Collections;
import java.util.List;

/**
 * Entity expressing the direction of a task dependency.
 */
public enum TaskDependency {
  UPSTREAM {
    @Override
    public List dependents(Task task) {
      return task.getUpstream();
    }
  },
  DOWNSTREAM {
    @Override
    public List dependents(Task task) {
      return task.getDownstream();
    }
  },
  NONE {
    @Override
    public List dependents(Task task) {
      return Collections.emptyList();
    }
  };

  public abstract List dependents(Task task);

}