Method append

java/lib/src/main/java/io/github/ccxt/ws/ArrayCache.java:56–71

Append an item to the cache. Evicts oldest if full. Tracks new updates per symbol for the newUpdates mechanism.

(Object item)

     * Tracks new updates per symbol for the newUpdates mechanism.
     */
    @SuppressWarnings("unchecked")
    public synchronized void append(Object item) {
        if (this.size() >= this.maxSize) {
            this.remove(0);
        }
        this.add(item);
        this.newUpdates.incrementAndGet();

        // Track per-symbol if item has a symbol field
        if (item instanceof Map) {
            Object symbol = ((Map<String, Object>) item).get("symbol");
            if (symbol instanceof String s) {
                this.newUpdatesBySymbol.merge(s, 1, Integer::sum);
            }
        }
    }

    /**
     * Get the number of new updates (since last call) for a symbol.