gistfile1.java

    private void expectNoPermits(String method) {
        final int availablePermits = writeLock.availablePermits();
        if (availablePermits != 0) {
            throw new RuntimeException(method + " has " + availablePermits + " permits. Expected 0.");
        }
    }
    
        private boolean setMostRecentlyUsedWithinRead(FaviconCacheElement element) {
        expectNoPermits("setMostRecentlyUsedWithinRead");

        reorderingSemaphore.acquireUninterruptibly();