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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.
*/
package android.filterfw.core;
import android.filterfw.core.Filter;
import android.filterfw.core.RoundRobinScheduler;
import android.util.Log;
import java.util.HashMap;
/**
* This OneShotScheduler only schedules source filters at most once. All other
* filters will be scheduled, and possibly repeatedly, until there is no filter
* that can be scheduled.
*
* @hide
*/
public class OneShotScheduler extends RoundRobinScheduler {
private HashMap <String, Integer> scheduled;
private final boolean mLogVerbose;
private static final String TAG = "OneShotScheduler";
public OneShotScheduler(FilterGraph graph) {
super(graph);
scheduled = new HashMap<String, Integer>();
mLogVerbose = Log.isLoggable(TAG, Log.VERBOSE);
}
@Override
public void reset() {
super.reset();
scheduled.clear();
}
@Override
public Filter scheduleNextNode() {
Filter first = null;
// return the first filter that is not scheduled before.
while (true) {
Filter filter = super.scheduleNextNode();
if (filter == null) {
if (mLogVerbose) Log.v(TAG, "No filters available to run.");
return null;
}
if (!scheduled.containsKey(filter.getName())) {
if (filter.getNumberOfConnectedInputs() == 0)
scheduled.put(filter.getName(),1);
if (mLogVerbose) Log.v(TAG, "Scheduling filter \"" + filter.getName() + "\" of type " + filter.getFilterClassName());
return filter;
}
// if loop back, nothing available
if (first == filter) {
break;
}
// save the first scheduled one
if (first == null) first = filter;
}
if (mLogVerbose) Log.v(TAG, "One pass through graph completed.");
return null;
}
}
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