| /** |
| * 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.oodt.cas.workflow.structs; |
| |
| //JDK imports |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| //OODT imports |
| import org.apache.oodt.cas.workflow.engine.processor.WorkflowProcessor; |
| |
| /** |
| * |
| * Sorts based on highest {@link Priority} for a {@link WorkflowProcessor} using |
| * a particular {@link #boostAmount} provided by a calling party. The |
| * {@link #boostAmount} is computed based on a function that allows |
| * {@link #boostAmount} to grow over time depending on |
| * {@link #secondsBetweenBoosts} and a maximum {@link #boostCap}. |
| * |
| * @author bfoster |
| * @author mattmann |
| * @version $Revision$ |
| * |
| */ |
| public class HighestFIFOPrioritySorter implements PrioritySorter { |
| |
| private int secondsBetweenBoosts; |
| private double boostAmount; |
| private double boostCap; |
| private static final Logger LOG = Logger |
| .getLogger(HighestFIFOPrioritySorter.class.getName()); |
| |
| public HighestFIFOPrioritySorter(int secondsBetweenBoosts, |
| double boostAmount, double boostCap) { |
| this.secondsBetweenBoosts = secondsBetweenBoosts; |
| this.boostAmount = boostAmount; |
| this.boostCap = boostCap; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see |
| * org.apache.oodt.cas.workflow.structs.PrioritySorter#sort(java.util.List) |
| */ |
| @Override |
| public synchronized void sort(List<WorkflowProcessor> candidates) { |
| |
| Collections.sort(candidates, new Comparator<WorkflowProcessor>() { |
| public int compare(WorkflowProcessor o1, WorkflowProcessor o2) { |
| return calculatePriority(o2).compareTo(calculatePriority(o1)); |
| } |
| }); |
| } |
| |
| private Double calculatePriority(WorkflowProcessor processorStub) { |
| double aliveTime = 0.0; |
| |
| try { |
| aliveTime = (double) (System.currentTimeMillis() - processorStub |
| .getWorkflowInstance().getCreationDate().getTime()); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| LOG.log(Level.WARNING, |
| "Unable to compute aliveTime for computing FIFO priority: Reason: [" |
| + e.getMessage() + "]"); |
| aliveTime = 0.0; |
| } |
| |
| double boostPercentage = aliveTime / 1000.0 |
| / (double) this.secondsBetweenBoosts; |
| return Math.max( |
| processorStub.getWorkflowInstance().getPriority().getValue(), |
| Math.min( |
| this.boostCap, |
| Double.valueOf(processorStub.getWorkflowInstance().getPriority() |
| .getValue() |
| + (boostPercentage * this.boostAmount)))); |
| } |
| |
| } |