/**
* Modify the configuration of the window cache.
*
* <p>The new configuration is applied immediately. If the new limits are smaller than what what
* is currently cached, older entries will be purged as soon as possible to allow the cache to
* meet the new limit.
*
* @param cfg the new window cache configuration.
* @throws IllegalArgumentException the cache configuration contains one or more invalid settings,
* usually too low of a limit.
*/
public static void reconfigure(final WindowCacheConfig cfg) {
final WindowCache nc = new WindowCache(cfg);
final WindowCache oc = cache;
if (oc != null) oc.removeAll();
cache = nc;
UnpackedObjectCache.reconfigure(cfg);
}
static final ByteWindow get(final PackFile pack, final long offset) throws IOException {
final WindowCache c = cache;
final ByteWindow r = c.getOrLoad(pack, c.toStart(offset));
if (c != cache) {
// The cache was reconfigured while we were using the old one
// to load this window. The window is still valid, but our
// cache may think its still live. Ensure the window is removed
// from the old cache so resources can be released.
//
c.removeAll();
}
return r;
}
static final void purge(final PackFile pack) {
cache.removeAll(pack);
}