RecyclableArrayDeque Class — netty Architecture

Source Code

handler/src/main/java/io/netty/handler/flow/FlowControlHandler.java lines 222–254

    private static final class RecyclableArrayDeque extends ArrayDeque<Object> {

        private static final long serialVersionUID = 0L;

        /**
         * A value of {@code 2} should be a good choice for most scenarios.
         */
        private static final int DEFAULT_NUM_ELEMENTS = 2;

        private static final Recycler<RecyclableArrayDeque> RECYCLER =
                new Recycler<RecyclableArrayDeque>() {
                    @Override
                    protected RecyclableArrayDeque newObject(Handle<RecyclableArrayDeque> handle) {
                        return new RecyclableArrayDeque(DEFAULT_NUM_ELEMENTS, handle);
                    }
                };

        public static RecyclableArrayDeque newInstance() {
            return RECYCLER.get();
        }

        private final Handle<RecyclableArrayDeque> handle;

        private RecyclableArrayDeque(int numElements, Handle<RecyclableArrayDeque> handle) {
            super(numElements);
            this.handle = handle;
        }

        public void recycle() {
            clear();
            handle.recycle(this);
        }
    }