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Use a SortedMap for efficient insertions.

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akwizgran
2012-01-24 14:40:45 +00:00
parent 3d4b5e6282
commit 899ec5e19e
1 changed files with 8 additions and 26 deletions
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34
components/net/sf/briar/transport/IncomingReliabilityLayerImpl.java
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@@ -2,8 +2,8 @@ package net.sf.briar.transport;
import java.io.IOException;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.ListIterator;
import java.util.SortedMap;
import java.util.TreeMap;
/** A reliability layer that reorders out-of-order frames. */
class IncomingReliabilityLayerImpl implements IncomingReliabilityLayer {
@@ -11,7 +11,7 @@ class IncomingReliabilityLayerImpl implements IncomingReliabilityLayer {
private final IncomingAuthenticationLayer in;
private final int maxFrameLength;
private final FrameWindow window;
private final LinkedList<Frame> frames; // Ordered by frame number
private final SortedMap<Long, Frame> frames;
private final ArrayList<Frame> freeFrames;
private long nextFrameNumber = 0L;
@@ -20,7 +20,7 @@ class IncomingReliabilityLayerImpl implements IncomingReliabilityLayer {
this.in = in;
maxFrameLength = in.getMaxFrameLength();
window = new FrameWindowImpl();
frames = new LinkedList<Frame>();
frames = new TreeMap<Long, Frame>();
freeFrames = new ArrayList<Frame>();
}
@@ -28,8 +28,7 @@ class IncomingReliabilityLayerImpl implements IncomingReliabilityLayer {
InvalidDataException {
freeFrames.add(f);
// Read frames until there's an in-order frame to return
Frame next = frames.peek();
while(next == null || next.getFrameNumber() > nextFrameNumber) {
while(frames.isEmpty() || frames.firstKey() > nextFrameNumber) {
// Grab a free frame, or allocate one if necessary
int free = freeFrames.size();
if(free == 0) f = new Frame(maxFrameLength);
@@ -44,29 +43,12 @@ class IncomingReliabilityLayerImpl implements IncomingReliabilityLayer {
nextFrameNumber++;
return f;
}
// Insert the frame into the list
if(next == null || next.getFrameNumber() > frameNumber) {
frames.push(f);
} else {
boolean inserted = false;
ListIterator<Frame> it = frames.listIterator();
while(it.hasNext()) {
if(it.next().getFrameNumber() > frameNumber) {
// Insert the frame before the one just examined
it.previous();
it.add(f);
inserted = true;
break;
}
}
if(!inserted) frames.add(f);
}
next = frames.peek();
// Insert the frame into the map
frames.put(frameNumber, f);
}
frames.poll();
if(!window.remove(nextFrameNumber)) throw new IllegalStateException();
nextFrameNumber++;
return next;
return frames.remove(frames.firstKey());
}
public int getMaxFrameLength() {