private static int tableSize(final WindowCacheConfig cfg) {
final int wsz = cfg.getPackedGitWindowSize();
final long limit = cfg.getPackedGitLimit();
if (wsz <= 0) throw new IllegalArgumentException("Invalid window size");
if (limit < wsz) throw new IllegalArgumentException("Window size must be < limit");
return (int) Math.min(5 * (limit / wsz) / 2, 2000000000);
}
private WindowCache(final WindowCacheConfig cfg) {
super(tableSize(cfg), lockCount(cfg));
maxFiles = cfg.getPackedGitOpenFiles();
maxBytes = cfg.getPackedGitLimit();
mmap = cfg.isPackedGitMMAP();
windowSizeShift = bits(cfg.getPackedGitWindowSize());
windowSize = 1 << windowSizeShift;
openFiles = new AtomicInteger();
openBytes = new AtomicLong();
if (maxFiles < 1) throw new IllegalArgumentException("Open files must be >= 1");
if (maxBytes < windowSize) throw new IllegalArgumentException("Window size must be < limit");
}