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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.Frame;
import android.filterfw.core.FrameFormat;
import android.filterfw.core.SimpleFrameManager;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
/**
* @hide
*/
public class CachedFrameManager extends SimpleFrameManager {
private SortedMap<Integer, Frame> mAvailableFrames;
private int mStorageCapacity = 24 * 1024 * 1024; // Cap default storage to 24MB
private int mStorageSize = 0;
private int mTimeStamp = 0;
public CachedFrameManager() {
super();
mAvailableFrames = new TreeMap<Integer, Frame>();
}
@Override
public Frame newFrame(FrameFormat format) {
Frame result = findAvailableFrame(format, Frame.NO_BINDING, 0);
if (result == null) {
result = super.newFrame(format);
}
result.setTimestamp(Frame.TIMESTAMP_NOT_SET);
return result;
}
@Override
public Frame newBoundFrame(FrameFormat format, int bindingType, long bindingId) {
Frame result = findAvailableFrame(format, bindingType, bindingId);
if (result == null) {
result = super.newBoundFrame(format, bindingType, bindingId);
}
result.setTimestamp(Frame.TIMESTAMP_NOT_SET);
return result;
}
@Override
public Frame retainFrame(Frame frame) {
return super.retainFrame(frame);
}
@Override
public Frame releaseFrame(Frame frame) {
if (frame.isReusable()) {
int refCount = frame.decRefCount();
if (refCount == 0 && frame.hasNativeAllocation()) {
if (!storeFrame(frame)) {
frame.releaseNativeAllocation();
}
return null;
} else if (refCount < 0) {
throw new RuntimeException("Frame reference count dropped below 0!");
}
} else {
super.releaseFrame(frame);
}
return frame;
}
public void clearCache() {
for (Frame frame : mAvailableFrames.values()) {
frame.releaseNativeAllocation();
}
mAvailableFrames.clear();
}
@Override
public void tearDown() {
clearCache();
}
private boolean storeFrame(Frame frame) {
synchronized(mAvailableFrames) {
// Make sure this frame alone does not exceed capacity
int frameSize = frame.getFormat().getSize();
if (frameSize > mStorageCapacity) {
return false;
}
// Drop frames if adding this frame would exceed capacity
int newStorageSize = mStorageSize + frameSize;
while (newStorageSize > mStorageCapacity) {
dropOldestFrame();
newStorageSize = mStorageSize + frameSize;
}
// Store new frame
frame.onFrameStore();
mStorageSize = newStorageSize;
mAvailableFrames.put(mTimeStamp, frame);
++mTimeStamp;
return true;
}
}
private void dropOldestFrame() {
int oldest = mAvailableFrames.firstKey();
Frame frame = mAvailableFrames.get(oldest);
mStorageSize -= frame.getFormat().getSize();
frame.releaseNativeAllocation();
mAvailableFrames.remove(oldest);
}
private Frame findAvailableFrame(FrameFormat format, int bindingType, long bindingId) {
// Look for a frame that is compatible with the requested format
synchronized(mAvailableFrames) {
for (Map.Entry<Integer, Frame> entry : mAvailableFrames.entrySet()) {
Frame frame = entry.getValue();
// Check that format is compatible
if (frame.getFormat().isReplaceableBy(format)) {
// Check that binding is compatible (if frame is bound)
if ((bindingType == frame.getBindingType())
&& (bindingType == Frame.NO_BINDING || bindingId == frame.getBindingId())) {
// We found one! Take it out of the set of available frames and attach the
// requested format to it.
super.retainFrame(frame);
mAvailableFrames.remove(entry.getKey());
frame.onFrameFetch();
frame.reset(format);
mStorageSize -= format.getSize();
return frame;
}
}
}
}
return null;
}
}
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