Method toArray

java/lib/src/main/java/io/github/ccxt/base/Functions.java:173–199

(Object a)

    // toArray
    // -------------------------------------------------
    public static List<Object> toArray(Object a) {
        if (a == null) return null;

        // WS caches mutate from the message-executor thread. Take the snapshot
        // under the cache's own monitor so the copy can't observe a remove(0)
        // mid-flight (would surface as nulls / off-by-one IOOBE downstream).
        if (a instanceof io.github.ccxt.ws.ArrayCache cache) {
            return cache.snapshot();
        }
        if (a instanceof List<?> l) {
            return new ArrayList<>((List<Object>) l);
        }

        // treat as map -> return values as list (preserve insertion order if possible).
        // Take the map's intrinsic lock so this iteration can't observe a concurrent
        // put/remove from a WS handler (paired with the synchronized block in
        // Helpers.addElementToObject's Map branch). Symptom without this: binance
        // watchTickers ConcurrentModificationException from HashMap$KeySpliterator.
        Map<String, Object> b = (Map<String, Object>) a;
        synchronized (b) {
            List<Object> out = new ArrayList<>(b.size());
            for (String key : b.keySet()) {
                out.add(b.get(key));
            }
            return out;
        }
    }

    // -------------------------------------------------
    // arrayConcat