com.sun.javafx.geom.DirtyRegionPool Maven / Gradle / Ivy
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package com.sun.javafx.geom;
import java.util.Deque;
import java.util.LinkedList;
public final class DirtyRegionPool {
private class PoolItem {
DirtyRegionContainer container;
long timeStamp;
public PoolItem(DirtyRegionContainer container, long timeStamp) {
this.container = container;
this.timeStamp = timeStamp;
}
}
private static final int POOL_SIZE_MIN = 4;
private static final int EXPIRATION_TIME = 3000;
private static final int COUNT_BETWEEN_EXPIRATION_CHECK = 30 * EXPIRATION_TIME / 1000;
private final int containerSize;
private int clearCounter = COUNT_BETWEEN_EXPIRATION_CHECK;
private final Deque fixed;
private final Deque unlocked;
private final Deque locked;
public DirtyRegionPool(int containerSize) {
this.containerSize = containerSize;
fixed = new LinkedList<>();
unlocked = new LinkedList<>();
locked = new LinkedList<>();
for (int i = 0; i < POOL_SIZE_MIN; ++i) {
fixed.add(new DirtyRegionContainer(containerSize));
}
}
public DirtyRegionContainer checkOut() {
clearExpired();
if (!fixed.isEmpty()) {
return fixed.pop();
}
if (!unlocked.isEmpty()) {
PoolItem item = unlocked.pop();
locked.push(item);
return item.container;
}
DirtyRegionContainer c = new DirtyRegionContainer(containerSize);
locked.push(new PoolItem(null, -1));
return c;
}
public void checkIn(DirtyRegionContainer drc) {
drc.reset();
if (locked.isEmpty()) {
fixed.push(drc);
} else {
PoolItem item = locked.pop();
item.container = drc;
item.timeStamp = System.currentTimeMillis();
unlocked.push(item);
}
}
private void clearExpired() {
if (unlocked.isEmpty()) {
return;
}
if (clearCounter-- == 0) {
clearCounter = COUNT_BETWEEN_EXPIRATION_CHECK;
PoolItem i = unlocked.peekLast();
long now = System.currentTimeMillis();
while (i != null && i.timeStamp + EXPIRATION_TIME < now) {
unlocked.removeLast();
i = unlocked.peekLast();
}
}
}
}