public void close(Handler<AsyncResult<Void>> handler) {
deleteCacheDir(handler);
if (shutdownHook != null) {
// May throw IllegalStateException if called from other shutdown hook so ignore that
try {
Runtime.getRuntime().removeShutdownHook(shutdownHook);
} catch (IllegalStateException ignore) {
}
}
}
private void setupCacheDir() {
String cacheDirName = CACHE_DIR_BASE + "/file-cache-" + UUID.randomUUID().toString();
cacheDir = new File(cacheDirName);
if (!cacheDir.mkdirs()) {
throw new IllegalStateException("Failed to create cache dir");
}
// Add shutdown hook to delete on exit
shutdownHook =
new Thread(
() -> {
CountDownLatch latch = new CountDownLatch(1);
deleteCacheDir(ar -> latch.countDown());
try {
latch.await(10, TimeUnit.SECONDS);
} catch (Exception ignore) {
}
});
Runtime.getRuntime().addShutdownHook(shutdownHook);
}