1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 18package android.filterfw.core; 19 20import java.util.Random; 21import java.util.Vector; 22 23import android.filterfw.core.Filter; 24import android.filterfw.core.Scheduler; 25 26/** 27 * @hide 28 */ 29public class RandomScheduler extends Scheduler { 30 31 private Random mRand = new Random(); 32 33 public RandomScheduler(FilterGraph graph) { 34 super(graph); 35 } 36 37 @Override 38 public void reset() { 39 } 40 41 @Override 42 public Filter scheduleNextNode() { 43 Vector<Filter> candidates = new Vector<Filter>(); 44 for (Filter filter : getGraph().getFilters()) { 45 if (filter.canProcess()) 46 candidates.add(filter); 47 } 48 if (candidates.size() > 0) { 49 int r = mRand.nextInt(candidates.size()); 50 return candidates.elementAt(r); 51 } 52 return null; 53 } 54} 55