FreeOnFinalize Class — netty Architecture

Source Code

buffer/src/main/java/io/netty/buffer/PoolThreadCache.java lines 474–498

    private static final class FreeOnFinalize {

        private volatile PoolThreadCache cache;

        private FreeOnFinalize(PoolThreadCache cache) {
            this.cache = cache;
        }

        /// TODO: In the future when we move to Java9+ we should use java.lang.ref.Cleaner.
        @SuppressWarnings({"FinalizeDeclaration", "deprecation"})
        @Override
        protected void finalize() throws Throwable {
            try {
                PoolThreadCache cache = this.cache;
                // this can race with a non-finalizer thread calling free: regardless who wins, the cache will be
                // null out
                this.cache = null;
                if (cache != null) {
                    cache.free(true);
                }
            } finally {
                super.finalize();
            }
        }
    }