| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * 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 from |
| * |
| * 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 edu.uci.ics.hyracks.control.cc.scheduler; |
| |
| public final class Runnability { |
| private final Tag tag; |
| |
| private final int priority; |
| |
| public Runnability(Tag tag, int priority) { |
| this.tag = tag; |
| this.priority = priority; |
| } |
| |
| public Tag getTag() { |
| return tag; |
| } |
| |
| public int getPriority() { |
| return priority; |
| } |
| |
| public enum Tag { |
| COMPLETED, |
| NOT_RUNNABLE, |
| RUNNABLE, |
| RUNNING, |
| } |
| |
| public static Runnability getWorstCase(Runnability r1, Runnability r2) { |
| switch (r1.tag) { |
| case COMPLETED: |
| switch (r2.tag) { |
| case COMPLETED: |
| case NOT_RUNNABLE: |
| case RUNNABLE: |
| case RUNNING: |
| return r2; |
| } |
| break; |
| |
| case NOT_RUNNABLE: |
| switch (r2.tag) { |
| case COMPLETED: |
| case NOT_RUNNABLE: |
| case RUNNABLE: |
| case RUNNING: |
| return r1; |
| } |
| break; |
| |
| case RUNNABLE: |
| switch (r2.tag) { |
| case COMPLETED: |
| return r1; |
| |
| case RUNNING: |
| return r1.priority > 0 ? r1 : new Runnability(Tag.RUNNABLE, 1); |
| |
| case NOT_RUNNABLE: |
| return r2; |
| |
| case RUNNABLE: |
| return r1.priority > r2.priority ? r1 : r2; |
| } |
| break; |
| |
| case RUNNING: |
| switch (r2.tag) { |
| case COMPLETED: |
| case RUNNING: |
| return r1; |
| |
| case NOT_RUNNABLE: |
| return r2; |
| |
| case RUNNABLE: |
| return r2.priority > 0 ? r2 : new Runnability(Tag.RUNNABLE, 1); |
| } |
| break; |
| } |
| throw new IllegalArgumentException("Could not aggregate: " + r1 + " and " + r2); |
| } |
| |
| @Override |
| public String toString() { |
| return "{" + tag + ", " + priority + "}"; |
| } |
| } |